CN100375413C - High power linear transmitting-receiving switch circuit - Google Patents
High power linear transmitting-receiving switch circuit Download PDFInfo
- Publication number
- CN100375413C CN100375413C CNB031264514A CN03126451A CN100375413C CN 100375413 C CN100375413 C CN 100375413C CN B031264514 A CNB031264514 A CN B031264514A CN 03126451 A CN03126451 A CN 03126451A CN 100375413 C CN100375413 C CN 100375413C
- Authority
- CN
- China
- Prior art keywords
- port
- microwave
- switch
- spdt
- pole double
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Transceivers (AREA)
Abstract
The present invention discloses a high power linear receiving-sending switching circuit which comprises an antenna port, a signal sending port, a signal receiving port, a switching control port, a microwave circulator, a microwave single-knife double-throw switch, a limiter, a switching signal control circuit, a signal sending side capacitor, a signal receiving side capacitor and a load resistor. Due to the fact that the present invention realizes the isolation of receiving and sending passages by a high power microwave circulator, a communicator can send high power. The switching circuit of the present invention has the advantages of compact composition, simple manufacture and good finished product consistency. The switching circuit of the present invention can be applied to wireless communication systems and other systems with all TDD working modes.
Description
Technical field
The present invention relates to a kind of frequency microwave transmit-receive switch circuit, relate in particular to the high-power high linear send of frequency microwave of the radio-frequency front-end transceiver module under TDD (time division duplex) mode of operation of field of wireless communication.
Background technology
In the wireless telecommunication system in present digital communication field, TDD (time division duplex) technology is used very general, and in the radio-frequency front-end of TDD wireless telecommunication system, transmit-receive switch is requisite parts.
The frequency microwave transmit-receive switch that generally uses generally is to use PIN diode as main devices at present, controls the PIN diode conducting of different paths and turn-offs the transmission-receiving function of realizing switch by bias voltage.This transmit-receive switch is typically Transmitting/Receiving Switch and Portable TerminalUnit, U.S. Patent number 20030119455.The described transmit-receive switch of this patent uses emission path series diode, receives the path parallel diode to ground, by the break-make of two diodes of a switch controlling signal control, realizes transmitting-receiving path handoff functionality.Though this method principle is comparatively simple,, be not easy to realize impedance matching, and consistency of performance is relatively poor because the impedance operator of PIN diode when transmitting power is bigger, realizes more complicated.
In the low-power wireless communication system, also usually use the integrated SPDT of frequency microwave monolithic (single-pole double throw) switch as transmit-receive switch.This switch uses semiconductor integrated circuit technology (radio frequency band more often use be the GaAs chip), volume is less, use this switch to realize that transmission-receiving function is fairly simple, and consistency is better, but this switch is because the semiconductor integrated circuit that is to use, the power that can bear is less, has suppressed its application in the wireless telecommunications of big transmitting power.
This two kinds of transmit-receive switches are because the Primary Component that has all used the semiconductor nonlinear device to switch as transmit-receive switch, thereby the linearity of sender is all had certain influence.
Summary of the invention
The technical problem that the present invention solves is to propose a kind of high-power linear send, to overcome the shortcoming that sender linearity, realization are difficult, consistency is relatively poor or power capacity is less that influences in the existing transmit-receive switch technology.
High-power linear send of the present invention comprises: antenna port, the port of posting a letter, collection of letters port, switch control port, microwave circulator, microwave single-pole double-throw switch (SPDT), amplitude limiter, switching signal control circuit, calling side capacitor, collection of letters side capacitors and load resistance;
The described port of posting a letter links to each other with the input of described microwave circulator by the calling side capacitor, the common port of described microwave circulator is connected to antenna port, the reflection output of described microwave circulator connects the common port of microwave single-pole double-throw switch (SPDT), an end that between the common port of the reflection output of described microwave circulator and microwave single-pole double-throw switch (SPDT), connects amplitude limiter, the other end ground connection of amplitude limiter, the collection of letters end of microwave single-pole double-throw switch (SPDT) connects collection of letters port by collection of letters side capacitors, the load end of microwave single-pole double-throw switch (SPDT) connects a load resistance, the other end ground connection of load resistance, the control end of described ON-OFF control circuit is connected to the control end of microwave single-pole double-throw switch (SPDT), and the other end of ON-OFF control circuit is connected to the switch control port.
High-power linear send of the present invention is owing to be to realize isolation between the transmitting-receiving path by powerful microwave circulator, so that sender can be launched bigger power, concrete peak power output is decided by employed microwave circulator, the general now microwave ferrite circulator minimum of using can be born the above power of 60W, and the general maximum of PIN diode transmit-receive switch can be born more than ten watt power, the very enough power that bears of microwave integrated switch is littler, and maximum is about 4W at present.And owing to do not have nonlinear device in the path of posting a letter of switch of the present invention, and it is bigger to bear power, so the linear effect for sender is very little, switching circuit of the present invention is formed more succinct, make simpler, the finished product consistency is also better, can be applied in the wireless telecommunication system and other system of all TDD working methods.
Description of drawings
Below in conjunction with accompanying drawing each several part function of the present invention and embodiment are further described.
Fig. 1 is the high-power linear send theory diagram of the present invention.
Fig. 2 is a kind of high-power linear send embodiment schematic diagram of the present invention.
Embodiment
The present invention is on the basis of described in front prior art scheme, by between transmitting-receiving port and antenna port, increasing the HIGH-POWERED MICROWAVES circulator, utilize the high linear of single-pass between each port of circulator and isolation characteristic and circulator itself, realize increasing the purpose of transmitting power and sender linearity.Among the present invention, switching between the transmitting-receiving no longer is to control by microwave SPDT switch merely to have realized, but realize the transmitting-receiving isolation by circulator, but wherein still include existing microwave switch technology, mainly be to be used in the collection of letters path, increase the isolation of the collection of letters port and the port of posting a letter, can't influence the transmitting power and the linearity of sender.
High-power high linear send of the present invention as shown in Figure 1 consists of the following components: 101 antenna ports, 102 post a letter port, 103 collection of letters ports, 109 switch control ports, 104 HIGH-POWERED MICROWAVES circulators, 105 microwave SPDT (single-pole double throw) switches, 107 amplitude limiters and 108 switching signal control circuits etc.As shown in Figure 1,102 ports of posting a letter connect by the input that 110 calling side capacitors connect 104 circulators, the common port of 104 circulators connects 101 antenna ports, the reflection output of 104 circulators connects the common port of 105 microwave SPDT switches, an end that between the common port of the reflection output of 104 circulators and 105 microwave SPDT switches, connects 107 amplitude limiters, the other end ground connection of 107 amplitude limiters, the collection of letters end of 105 microwave SPDT switches connects 103 collection of letters ports by 111 collection of letters side capacitors, the load end of 105 microwave SPDT switches 50 ohm of 106 load resistance in parallel over the ground.The control end of 108 ON-OFF control circuit connects the control end of 105 microwave SPDT switches.The other end of 108 ON-OFF control circuit connects 109 switch control ports.
Specifically introduce the function of circuit main devices below again:
A) 104 HIGH-POWERED MICROWAVES circulators mainly provide the transmission duplex function.
When transmitting, the signal of sender output, by the common port output of 104 circulators, is launched by 101 antenna ports by the input input of 104 circulators by 102 ports of posting a letter again.104 circulators reflection output is isolated for 104 circulator inputs, and therefore the signal of emission can directly not enter 105 microwave SPDT switches by 104 circulators reflection output.
During acknowledge(ment) signal, signal is entered by 101 antenna ports of transmit-receive switch, and through the common port of 104 circulators, from the reflection output output of 104 circulators, the common port through 105 microwave SPDT switches enters receiver with collect mail end and 103 collection of letters ports again.And this moment, the input of 104 circulators is isolated for the common port of 104 circulators, so the signal that receives can not enter 102 ports of posting a letter yet.
B) 105 microwave SPDT switches are mainly finished the switching function of collection of letters path, and improve the post a letter isolation of port, 101 antenna ports of 103 collection of letters ports and 102.
When transmitting, the control signal of outside baseband circuit output, import by 109 switch control ports, control 105 microwave SPDT switches by 108 ON-OFF control circuit, make the common port and the load end conducting of 105 microwave SPDT switches, common port is in isolation with the end of collecting mail, and has improved collection of letters path and has posted a letter the isolation of path, and suppressed owing to the 101 antenna port impedance reflected signal that produces that do not match enters 103 collection of letters ports.Also improved simultaneously the reverse isolation degree of 104 circulator inputs and output, the reflection of the reflected signal that has suppressed 101 antenna ports by 105 microwave SPDT switch common ports enters 102 ports of posting a letter from 104 circulator inputs again.
During received signal, 105 microwave SPDT switches are under the base band control signal of 109 switch control ports input is controlled by 108 ON-OFF control circuit, common port and load end are in isolation, the common port and the end conducting of collecting mail, the signal that enters from 101 antenna ports of transmit-receive switch is through the common port and the reflection output port of 104 circulators, enter 103 collection of letters ports via the common port of 105 microwave SPDT switches and the end of collecting mail again, finish collection of letters function.
C) 107 amplitude limiters are protection devices to collection of letters path; prevent from the signal of 101 antenna ports input excessive; perhaps the signal of 101 antenna port reflects is excessive; enter the common port of 105 microwave SPDT switches by 104 circulators; 105 microwave SPDT switches are damaged; perhaps enter 103 collection of letters ports, thereby damage receiver.
D) 108 ON-OFF control circuit are mainly finished the Control work of 105 microwave SPDT switches, make 105 microwave SPDT switches can be under the signal controlling of 109 switch control ports inputs operate as normal.The input of 109 switch control ports is by the digital signal of outside baseband circuit output, by " height " and " low " of signal, controls the switch of 105 microwave SPDT switches by 108 ON-OFF control circuit, thereby has controlled the switch of collection of letters path.
In conjunction with Fig. 2, below one embodiment of the present of invention are elaborated:
This embodiment is basic corresponding with the theory diagram in the accompanying drawing 1.201 antenna ports, 202 in the accompanying drawing 2 post a letter in port, 203 collection of letters ports, 209 switch control ports, 204 large power ferrite microwave circulators, 205AW002R2-12,207 amplitude limiters and 208 frame of broken lines circuit respectively with accompanying drawing 1 in post a letter port, 103 collection of letters ports, 109 switch control ports, 104 HIGH-POWERED MICROWAVES circulators, 105 microwave SPDT (single-pole double throw) switches, 107 amplitude limiters and 108 switching signal control circuits of 101 antenna ports, 102 corresponding one by one.
A) emission mode.Under this pattern, the signal of sender emission is by 202 ports of posting a letter, by the input input of 204 large power ferrite microwave circulators, by the common port output of 204 circulators.Because reflection output and the input of circulator are isolated, so the radiofrequency signal that enters from the input of circulator can directly not enter 203 collection of letters ports by reflecting output.At this moment, the common port J1 of the integrated SPDT switch of the 205 microwaves AW002R2-12 that is connected with circulator reflection output and hold J3 to be in off-state with collecting mail, common port J1 and load end J2 connect, and J2 reconnects an end of 20650 ohmic load resistance, the other end ground connection of 206 load resistances.So not only increased the isolation of 203 receiving ports and 202 emission ports, and absorbed the power that the impedance owing to 201 antenna ports does not match and reflects back, also improved simultaneously the reverse isolation degree of 204 circulator inputs and output, the reflection of the reflected signal that has suppressed 201 antenna ports by 205AW002R2-12 common port J1 enters 202 ports of posting a letter from 204 circulator inputs again.
B) receiving mode.Under this pattern, signal is by the common port input of 204 large power ferrite circulators, by the output of reflection output.At this moment, the common port J1 of 205AW002R2-12 and receiving terminal J3 conducting disconnect with load end J2.The signal that receives is by the output of the reflection output of 204 circulators, and J1 and J3 port by 205 microwave integrated switch AW002R2-12 are input to 203 collection of letters ports.At this moment, the input of 204 circulators and common port are in the reverse isolation state, receive signal and can directly not enter 202 ports of posting a letter.
C) 208 ON-OFF control circuit are circuit that the integrated SPDT switch of 205 microwave monolithics AW002R2-12 is controlled, mainly by triple channel analog switch and peripheral circuit thereof and ± the 5V power line forms.The triple channel analog switch here can use 74HC4053.To be connected on the A, B two pins of 74HC4053 by 209 switch control ports by the switch controlling signal T/RC of outside baseband circuit output, when the T/RC signal was " height ", X=X1 be " height " also, and Y=Y1 was " low ".When the T/RC signal was " low ", the logical AND T/RC of X, Y was opposite when being " height ".The integrated SPDT switch of 205 microwave monolithics AW002R2-12, pin V1, V2 are the control pin, and wherein the V1 logic connects the pin Y of 74HC4053, and the V2 logic connects the pin X of 74HC4053.The common port J1 of 205AW002R2-12 is connected the reflection output of 204 microwave ferrite circulators, and the end J3 that collects mail connects 203 collection of letters ports, and load end J2 connects 20650 ohm of power termination resistance, the other end ground connection of 206 load resistances.So just, connect into previously described transmit-receive switch.Therefore when the T/RC signal is " height ", V1 is " low ", V2 is " height ", J1 and the J2 conducting of 205AW002R2-12 at this moment, disconnect with J3, the signal that seals in from the reflection of the common port of 204 microwave circulators is absorbed by 205 load resistances, and the input that just can not be reflected again by 204 microwave circulators enters 203 collection of letters ports; When the T/RC signal is " low ", V1 is " height ", V2 is " low ", J1 and the J3 conducting of 205AW002R2-12 at this moment, disconnect with J2, the signal that receive from 204 circulator common ports this moment just passes through the reflection output of 204 circulators, enters 203 collection of letters ports by the common port J1 of 205AW002R2-12 and the end J3 that collects mail again.
D) 207 amplitude limiters are connected between the common port J1 and ground of 205AW002R2-12, realize the limited amplitude protection function for collection of letters path.If excessive from the signal power that the reflection output of 204 microwave circulators enters, surpassed the tolerance range of 205AW002R2-12, will have been protected 205AW002R2-12 by 207 amplitude limiter amplitude limits, make it avoid damaging.
Like this, just finished the function of microwave high power linear send by the circuit that mainly constitutes by 204 HIGH-POWERED MICROWAVES ferrite toroidal devices, 205 microwave monolithics integrated SPDT switch AW002R2-12 and 208 ON-OFF control circuit of mainly forming by 74HC4053 and peripheral circuit thereof and 207 amplitude limiters.
Claims (6)
1. high-power linear send, it is characterized in that described circuit comprises: antenna port (101), the port of posting a letter (102), collection of letters port (103), switch control port (109), microwave circulator (104), microwave single-pole double-throw switch (SPDT) (105), amplitude limiter (107), ON-OFF control circuit (108), calling side capacitor (110), collection of letters side capacitors (111) and load resistance (106);
The described port of posting a letter (102) links to each other with the input of described microwave circulator (104) by calling side capacitor (110), the common port of described microwave circulator (104) is connected to antenna port (101), the reflection output of described microwave circulator (104) connects the common port of microwave single-pole double-throw switch (SPDT) (105), an end that between the common port of the reflection output of described microwave circulator (104) and microwave single-pole double-throw switch (SPDT) (105), connects amplitude limiter (107), the other end ground connection of amplitude limiter (107), the collection of letters end of microwave single-pole double-throw switch (SPDT) (105) connects collection of letters port (103) by collection of letters side capacitors (111), the load end of microwave single-pole double-throw switch (SPDT) (105) connects load resistance (106), the other end ground connection of load resistance (106), the control end of described ON-OFF control circuit (108) is connected to the control end of microwave single-pole double-throw switch (SPDT) (105), and the other end of ON-OFF control circuit (108) is connected to switch control port (109);
Described microwave circulator (104) provides the transmission duplex function: when transmitting, the signal of sender output is by the port of posting a letter (102), input input by microwave circulator (104), export by the common port of microwave circulator (104) again, launch by antenna port (101), microwave circulator (104) reflection output is isolated for microwave circulator (104) input; During received signal, signal is entered by the antenna port (101) of transmit-receive switch, common port through microwave circulator (104), reflection output output from microwave circulator (104), the common port that passes through microwave single-pole double-throw switch (SPDT) (105) again enters receiver with collect mail end and collection of letters port (103), and the input of microwave circulator (104) is isolated for the common port of microwave circulator (104);
Described microwave single-pole double-throw switch (SPDT) (105) is finished the switching function of collection of letters path, and improve the isolation of collection of letters port (103) and post a letter port (102), antenna port (101), when transmitting, the control signal of outside baseband circuit output, import by switch control port (109), by ON-OFF control circuit (108) controlled microwave single-pole double-throw switch (SPDT) (105), make the common port and the load end conducting of microwave single-pole double-throw switch (SPDT) (105), common port is in isolation with the end of collecting mail; The load end of microwave single-pole double-throw switch (SPDT) (105) connects the isolation that load resistance (106) increases collection of letters port (103) and the port of posting a letter (102), and absorb the power that the impedance owing to antenna port (101) does not match and reflects back, also improved simultaneously the reverse isolation degree of microwave circulator (104) input and output, during received signal, microwave single-pole double-throw switch (SPDT) (105) is under the base band control signal of switch control port (109) input is controlled by ON-OFF control circuit (108), common port and load end are in isolation, the common port and the end conducting of collecting mail;
Described amplitude limiter (107) is a protection device to collection of letters path, prevents from the signal of antenna port (101) input excessively, and perhaps the signal of antenna port (101) reflection is excessive;
Described ON-OFF control circuit (108) is finished the Control work of microwave single-pole double-throw switch (SPDT) (105), make microwave single-pole double-throw switch (SPDT) (105) can be under the signal controlling of switch control port (109) input operate as normal, switch control port (109) input, it is digital signal by outside baseband circuit output, " height " and " low " by signal, by the switch of ON-OFF control circuit (108) controlled microwave single-pole double-throw switch (SPDT) (105), thus the switch of control collection of letters path.
2. high-power linear send according to claim 1, it is characterized in that, described microwave single-pole double-throw switch (SPDT) (105) is the integrated single-pole double-throw switch (SPDT) AW002R2-12 of microwave monolithic, and control pin V1, the V2 of described switch links to each other with the control end of ON-OFF control circuit (108); The common port J1 of described switch is connected to the reflection output of microwave circulator (104), and the end J3 collection of letters side capacitors (111) of collecting mail connects collection of letters port (103), and load end J2 connects load resistance (106).
3. high-power linear send according to claim 1 and 2, it is characterized in that, described ON-OFF control circuit (108) by triple channel analog switch, peripheral circuit and ± the 5V power line forms, switch controlling signal is connected to by switch control port (109) on the input signal pin of described triple channel analog switch, and the output signal pin of described triple channel analog switch is connected to the control end of described microwave single-pole double-throw switch (SPDT) (105).
4. high-power linear send according to claim 3, it is characterized in that, described triple channel analog switch can use 74HC4053, the A of described 74HC4053, B two pins link to each other with switch control port (109), and output pin X, the Y of described 74HC4053 links to each other with control pin V2, the V1 of the integrated single-pole double-throw switch (SPDT) AW002R2-12 of described microwave monolithic respectively.
5. high-power linear send according to claim 1 and 2 is characterized in that, the resistance of described load resistance (106) is 50 ohm.
6. high-power linear send according to claim 1 and 2 is characterized in that, described microwave circulator (104) uses HIGH-POWERED MICROWAVES ferrite toroidal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031264514A CN100375413C (en) | 2003-09-28 | 2003-09-28 | High power linear transmitting-receiving switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031264514A CN100375413C (en) | 2003-09-28 | 2003-09-28 | High power linear transmitting-receiving switch circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1492606A CN1492606A (en) | 2004-04-28 |
| CN100375413C true CN100375413C (en) | 2008-03-12 |
Family
ID=34239659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031264514A Expired - Fee Related CN100375413C (en) | 2003-09-28 | 2003-09-28 | High power linear transmitting-receiving switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100375413C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1734955B (en) * | 2004-08-09 | 2010-08-18 | 台扬科技股份有限公司 | Microwave duplex transmission device with isolating circuit |
| CN100365947C (en) * | 2004-12-17 | 2008-01-30 | 华为技术有限公司 | Heat backup system and method for radio-frequency power amplifier |
| CN103580710A (en) * | 2012-07-18 | 2014-02-12 | 中兴通讯股份有限公司 | TDD standard radio frequency receiving and sending circuit and method, radio frequency front end circuit and terminal |
| CN103954936A (en) * | 2014-04-14 | 2014-07-30 | 芜湖航飞科技股份有限公司 | Radar transmitting-receiving switch provided with microwave high-power amplitude limiter |
| CN105490644A (en) * | 2014-10-10 | 2016-04-13 | 中兴通讯股份有限公司 | Method and device for improving insulation of circulator of power amplifier |
| CN105897186B (en) * | 2016-05-16 | 2019-01-22 | 江苏指南针导航通信技术股份有限公司 | A kind of low noise amplifier and application method for satellite navigation and time service |
| CN109831227A (en) * | 2019-02-25 | 2019-05-31 | 成都极客通科技有限公司 | A kind of same frequency difference turns day current feed circuit and its trunk desk antenna feeder equipment |
| CN110932751A (en) * | 2019-11-26 | 2020-03-27 | 京信通信系统（中国）有限公司 | High-power up-down switching device and communication equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122534A (en) * | 1994-08-29 | 1996-05-15 | 株式会社日立制作所 | Low distortion switch |
| EP0878918A1 (en) * | 1995-12-18 | 1998-11-18 | Matsushita Electric Industrial Co., Ltd. | Transmitter-receiver circuit for radio communication and semiconductor integrated circuit device |
-
2003
- 2003-09-28 CN CNB031264514A patent/CN100375413C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122534A (en) * | 1994-08-29 | 1996-05-15 | 株式会社日立制作所 | Low distortion switch |
| EP0878918A1 (en) * | 1995-12-18 | 1998-11-18 | Matsushita Electric Industrial Co., Ltd. | Transmitter-receiver circuit for radio communication and semiconductor integrated circuit device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1492606A (en) | 2004-04-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105049015B (en) | The single-pole double throw RF switch and hilted broadsword of single-pole single-throw(SPST RF switch and its composition throw RF switch more | |
| CA2155093C (en) | Half duplex rf transceiver having low transmit path signal loss | |
| EP0746118B1 (en) | Antenna switching circuit and wireless communication system | |
| CN1118952C (en) | Circulator usage in time division duplex radios | |
| CN101282127B (en) | Transmit-receive switching mechanism for TDD radio communication system | |
| CN103368601B (en) | Wireless communication transceiver front end | |
| CN105049016B (en) | The single-pole double throw RF switch and hilted broadsword of single-pole single-throw(SPST RF switch and its composition throw RF switch more | |
| CN100517996C (en) | High-frequency switch module | |
| CN101617474A (en) | Electronic switch network | |
| CN106571850A (en) | Bidirectional amplifier of TDD mode | |
| CN210780780U (en) | Balanced radio frequency front end receiving and transmitting circuit and system | |
| CN1463502A (en) | Transmit/receive switch for RF transceiver | |
| US8331388B2 (en) | Circuit arrangement and method of operating a circuit arrangement | |
| CN100375413C (en) | High power linear transmitting-receiving switch circuit | |
| CN102545946A (en) | Radio frequency front-end circuit | |
| CN205017288U (en) | Single pole single throw RF switch and RF switch is thrown to single -pole double throw RF switch and hilted broadsword that constitute more thereof | |
| CN210670067U (en) | High-linearity receiving and transmitting radio frequency switch with ESD protection and radio frequency receiving and transmitting device | |
| CN1258933C (en) | Time division duplex receiving sending switch device | |
| JPH08298404A (en) | Transmitter-receiver | |
| CN209949082U (en) | Signal receiving and transmitting device and terminal | |
| CN110932751A (en) | High-power up-down switching device and communication equipment | |
| CN110429929A (en) | A kind of quarter-wave long structure millimeter wave switch | |
| CN101599744A (en) | The high-power bilateral amplifier of tdd mode | |
| CN212163332U (en) | Three-channel UWB radio frequency front end module | |
| CN210693926U (en) | High-power up-down switching device and communication equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080312 Termination date: 20130928 |