CN102969550B - low-pass micro-strip filter - Google Patents
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- CN102969550B CN102969550B CN201110257177.6A CN201110257177A CN102969550B CN 102969550 B CN102969550 B CN 102969550B CN 201110257177 A CN201110257177 A CN 201110257177A CN 102969550 B CN102969550 B CN 102969550B
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Abstract
A kind of low-pass micro-strip filter, make on a printed circuit, comprise first micro-band, second micro-band, the 3rd micro-band and the micro-band group of " mountain " font of falling, wherein, described micro-band group comprises micro-ly is with the first micro-band section, second micro-band section and the 3rd micro-band section that are connected with described first micro-band, second micro-band and the 3rd respectively, also comprises the 4th micro-band section that band section micro-with three is connected; Described first micro-band section, second micro-band section and the 3rd micro-band section be followed successively by down " mountain " font from left several vertical line, the 4th micro-band section is fall the horizontal line of " mountain " font; Described first micro-band section, second micro-band section and the 3rd micro-band Duan Jun are provided with two bends at middle part; Described first micro-band section is provided with input, and described 3rd micro-band section is provided with output.See thus, this filter construction is simple.
Description
[technical field]
The present invention relates to wireless communication field, particularly relate to a kind of low-pass micro-strip filter.
[background technology]
Along with modern microwave communication, the especially fast development of mobile communication, wireless communication technology, the selectivity of system to communication is more and more higher.Filter is used to a kind of device being separated different frequency microwave signal.Its Main Function suppresses unwanted signal, make its not by, only allow the signal needed pass through.Microstrip filter is widely used in military project group circle and single chip microwave integrated circuit.In microwave circuit system, the performance index of performance to circuit of filter have a great impact, and can say that the quality of filter directly determines the quality of product.Therefore how to design one and there is high performance filter, design microwave circuit system tool is had very important significance.The rapid growth of radio communication and other removable Receiver And Transmitter application in recent years, microwave circuit system is widely used, and wherein making filter with micro-band is that it mainly one of is applied, and is particularly widely used especially in field of wireless communication.
While wireless communication technology fast development, more and more higher requirement is proposed to the electric property of filter.For meeting the demand of radio communication service, the situation that China specifies according to frequency partition and frequency spectrum uses defines the technical parameter of 2.4GHz frequency range wireless transmitting device.Wherein require that scattering transmission power is less than-30 decibels above milliwatts/megahertz (dBm/1MHz).And see that harmonic ratio is abundanter according to the characteristic of the PA that WLAN (Wireless Local Area Network, WLAN (wireless local area network)) scheme uses (Power Amplifier, power amplifier).Can find out from the spuious resolution chart of the traditional wlan product prevention at radio-frequency port of Fig. 1 second harmonic and four-time harmonic interference signal still stronger, very close-30dBm/1MHz, does not have surplus substantially.This just needs filter except being with internal loss little, and Out-of-band rejection is than high.Particularly there is high request at the rejection ability at the frequency multiplication place of working frequency points, otherwise the operation of other equipment may be interfered with.
Wlan product is universal in recent years, not only proposes high request to the performance of filter, also it is also proposed very high requirement to the miniaturization of filter.Just because of the small form factor requirements of equipment, a lot of design producer adopts integrated filter.But integrated filter construction is complicated, cost is high and the interior Insertion Loss of band is large, and there is no good behaviour on the harmonic wave of 2.4G.
[summary of the invention]
Based on this, be necessary to provide a kind of structure simple low-pass micro-strip filter.
A kind of low-pass micro-strip filter, make on a printed circuit, it is characterized in that, comprise first micro-band, second micro-band, the 3rd micro-band and " mountain " shaped offset of microstrip group of falling, wherein, described micro-band group comprises micro-ly is with the first micro-band section, second micro-band section and the 3rd micro-band section that are connected with described first micro-band, second micro-band and the 3rd respectively, also comprises the 4th micro-band section that band section micro-with three is connected; Described first micro-band section, second micro-band section and the 3rd micro-band section be followed successively by down " mountain " font from left several vertical line, the 4th micro-band section is fall the horizontal line of " mountain " font; In two described bends of same micro-band section, contrary and one end, angular direction is connected, another two ends extend to form two mutual Line Segment respectively to rightabout, described first micro-band section is provided with the first cross shaped microstrip, it is input that described first cross shaped microstrip falls the left end of " mountain " shaped offset of microstrip group relatively, described 3rd micro-band section is provided with the 3rd cross shaped microstrip, and it is output that described 3rd cross shaped microstrip falls the right-hand member of " mountain " shaped offset of microstrip group relatively.
Preferably, the described straightway in described first micro-band section, second micro-band section and the 3rd micro-band section is parallel to each other and perpendicular to described 4th micro-band section.
Preferably, two described bends of described first micro-band section comprise the first bend, the second bend, and wherein said first bend is located at the left of described second bend relative to described second bend; Two described bends of described second micro-band section comprise the 3rd bend, the 4th bend, and wherein said 3rd bend is located at the right of described 4th bend relative to described 4th bend; And two described bends of described 3rd micro-band section comprise the 5th bend, the 6th bend, wherein said 5th bend is located at the right of described 6th bend relative to described 6th bend.
Preferably, the bent angle of described bend is fillet, and the angle of the extended line at described fillet two ends is 90 degree.
Preferably, the angle of described first micro-band section, the 3rd micro-band section and described 4th junction, micro-band section two ends is fillet; The angle of described second micro-band section and described 4th micro-band section junction is right angle.
Preferably, described first micro-band, second micro-band and the 3rd micro-band are length 93 mil, the rectangle of width 63 mil.
Preferably, described first micro-band section, second micro-band section, the 3rd micro-band section and the 4th micro-band section print width on described printed circuit board is 8 mils.
Preferably, described low-pass micro-strip filter is operated in 2.4GHz ~ 2.484GHz band limits.
Preferably, the length of side of described low-pass micro-strip filter is 5.3 millimeters, and width is 5.1 millimeters.
Technique scheme is by making the low-pass micro-strip filter by three micro-bands and micro-band group on a printed circuit, micro-band group comprises the four micro-band section of being with three micro-band sections being connected and three micro-band section connect micro-with three, see thus, this low-pass micro-strip filter structure is simple.
[accompanying drawing explanation]
Fig. 1 is the spuious resolution chart of certain traditional wlan product prevention at radio-frequency port;
Fig. 2 is the PCB domain of low-pass micro-strip filter in an embodiment;
Fig. 3 is the theory diagram of low-pass micro-strip filter shown in Fig. 2;
The return loss simulation result figure that Fig. 4 is low-pass micro-strip filter shown in Fig. 2;
The transmission characteristic simulation result figure that Fig. 5 is low-pass micro-strip filter shown in Fig. 2;
Fig. 6 is certain traditional lamination paster band pass filter electrical characteristic table.
[embodiment]
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is described in more detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Can find out from the spuious resolution chart of the traditional wlan product prevention at radio-frequency port of Fig. 1 second harmonic and four-time harmonic interference signal still stronger, very close-30dBm/1MHz, does not have surplus substantially.This just needs filter except being with internal loss little, and Out-of-band rejection is than high, particularly in the rejection ability requirement at the frequency multiplication place of working frequency points, otherwise may interfere with the operation of other equipment.
The technical program is by understanding the feature of 2.4GHz frequency range wireless transmitting device system, with maximally-flat low pass filter for prototype, and process is optimized to microstrip filter, little is required as far as possible for Insertion Loss in 2.4GHz frequency range, the principle of hair clip filter and the open stub of applying in a flexible way, and in conjunction with the mode of electromagnetism hybrid coupled, make it on harmonics restraint, obtain good effect.
As shown in Figure 2,3, a kind of low-pass micro-strip filter comprises the micro-band 120 of first micro-band 110, second, the 3rd micro-band 130 and the micro-band group of " mountain " font of falling.The printing length of side of low-pass micro-strip filter is 5.3 millimeters, and width is 5.1 millimeters, and this size relatively other microstrip filter volumes is few, thus it is few to take pcb board space, and production cost is extremely low.In the present embodiment, low-pass micro-strip filter becomes in FR4 material printed circuit board upper berth copper, in other embodiments, can pave make with the material that other can realize said function.
In this enforcement, the first micro-band 120 of micro-band 110, second and the 3rd micro-band 130 are rectangle, and its length of side is preferably 93 mils, wide preferably 63 mils.In other embodiments, can be the fillet of other sizes, the shape that can realize said function such as trapezoidal.Micro-band group comprises the micro-band section 220 of first micro-band section 210, second, the 3rd micro-band section 230 and the 4th micro-band section 240.First micro-band section 210 is connected with first micro-band 110, and second micro-band section 220 connects and is connected with second micro-band 120, and the 3rd micro-band section 230 is connected with the 3rd micro-band 130, and the 4th micro-band section 240 is connected with aforementioned three micro-band sections.The first micro-band section 220 of micro-band section 210, second and the 3rd micro-band section 240 be followed successively by down " mountain " font from left several vertical line (be " mountain " font from right several vertical line), the 4th micro-band section 240 is the horizontal line of " mountain " font.
It is 8 mils that the micro-band section 220 of first micro-band section 210, second, the 3rd micro-band section 230 and the 4th micro-band section 240 print width on described printed circuit board.In other embodiments, coordinate miscellaneous part to make distortion, when performance of filter can be kept constant, suitably can adjust printing width within the scope of 6 mil to 10 mils.
First micro-band section 210, the 3rd micro-band section 230 are connected with the 4th micro-band section 240 two ends, and the angle of junction is fillet, and the angle of the extended line at fillet two ends is 90 degree.In other embodiments, coordinate miscellaneous part to make distortion, when performance of filter can be kept constant, first micro-band section 210, the 3rd micro-band section 230 and the 4th junction, micro-band section 240 two ends can be corner cut, also can be right angle.
4th micro-band section 240 is provided with the micro-band section 220 of the 4th cross shaped microstrip 246, second and the 4th micro-band section 240 with the 4th cross shaped microstrip 246 for tie point, and the angle of junction is right angle.In other embodiments, coordinate miscellaneous part to make distortion, when performance of filter can be kept constant, second micro-band section 220 and the 4th micro-band section 240 junction can be fillet.
The first micro-band section 220 of micro-band section 210, second and the 3rd micro-band section 230 are all provided with two bends at middle part; First micro-band section 210 is provided with input, and the 3rd micro-band section 230 is provided with output.
In the present embodiment, the bent angle of bend is fillet, and the angle of the extended line at its two ends is 90 degree (namely angle A is 90 degree).In other are implemented, coordinate miscellaneous part to make distortion, when performance of filter can be kept constant, the bent angle of bend can be corner cut, also can be right angle.
Two bends in first micro-band section 210 comprise the first bend 212 and the second bend 214, first bend 212 is contrary with angular direction in the second bend 214 and one end connected, wherein the first bend 212 is located at down " mountain " font left relative to the second bend 214.
First bend 212 and the second disjunct two ends of bend 214 extend to form two mutual Line Segment respectively to rightabout, and the first bend 212 extends to form the first straightway 213, second bend and extends to form the second straightway 215.First straightway 213 is parallel with the second straightway 215.Second straightway 215 is provided with the first cross shaped microstrip 216, first cross shaped microstrip 216, and relatively to fall the left end of the micro-band section of " mountain " font be input.
Two bends in second micro-band section 220 comprise the 3rd bend 222 and the 4th bend 224,3rd bend 222 is contrary with angular direction in the 4th bend 224 and one end connected, and wherein the 3rd bend 222 is located at down " mountain " font right relative to the 4th bend 224.
3rd bend 222 and the 4th disjunct two ends of bend 224 extend to form two mutual Line Segment respectively to rightabout, and the 3rd bend 222 extends to form the 3rd straightway the 223, four bend 224 and extends to form the 4th straightway 225.3rd straightway 223 is parallel with the 4th straightway 225.4th straightway 225 is provided with the second cross shaped microstrip 226 for connecting microstrip line.
Two bends in 3rd micro-band section 230 comprise the 5th bend 232 and the 6th bend 234,5th bend 232 is contrary with angular direction in the 6th bend 234 and one end connected, and wherein the 5th bend 232 is located at down " mountain " font right relative to the 6th bend 234.
5th bend 232 and the 6th disjunct two ends of bend 234 extend to form two mutual Line Segment respectively to rightabout, and the 5th bend 232 extends to form the 5th straightway the 233, six bend 234 and extends to form the 6th straightway 235.5th straightway 233 is parallel with the 6th straightway 235.6th straightway 235 is provided with cross shaped microstrip the 236, three cross shaped microstrip 236, and relatively to fall the right-hand member of the micro-band section of " mountain " font be output.
Straightway in the first micro-band section 220 of micro-band section 210, second and the 3rd micro-band section 220, namely the first straightway 213, second straightway 215, the 3rd straightway 223, the 4th straightway 225, the 5th straightway 233 and the 6th straightway 235 are parallel to each other and perpendicular to the 4th micro-band section 240.Be appreciated that, straightway is parallel to each other and straightway is the special case in numerous embodiment perpendicular to the 4th micro-band section 240, miscellaneous part is coordinated to make distortion, when performance of filter can be kept constant, can form angle between straightway, straightway also can be not orthogonal to the 4th micro-band section 240 simultaneously.
In the present embodiment, first bend 212, the interior angle of the 4th bend 224 and the 6th bend 234 falls " mountain " font all to the right relatively, and the second bend 214, the interior angle of the 3rd bend 222 and the 5th bend 234 falls " mountain " font all left relatively, be appreciated that, in other embodiments, miscellaneous part is coordinated to make distortion, when performance of filter can be kept constant, random variation can be made in bend direction in each micro-band section, such as the first bend 212, 3rd bend 222 and the 5th bend 232 can be in the same way, and the second bend 212, 4th bend 224 and the 6th bend 234 can be in the same way, first bend 212 and the 3rd bend 222 are reverse with the 5th bend 232 in the same way, and the second bend 212 and the 4th bend 224 are reverse with the 6th bend 234 in the same way.
In the present embodiment, low-pass micro-strip filter band trap wave unit, micro-band group of trap wave unit refers to down " mountain " font, the low-pass micro-strip filter of band trap wave unit take maximum flat filter as prototype, and in conjunction with the feature of hair clip filter.As the theory diagram of the low-pass micro-strip filter of Fig. 3 band trap wave unit, this design is made up of 26 sections of microstrip lines.The input, output-resistor of this low-pass micro-strip filter is 50 ohm.
In the present embodiment, by Fast design method that conventional filter design formula is combined with microstrip circuit simulation.Substantially identical with the result finally emulated by the result of the method design of filter, use electromagnetism hybrid coupled mode and control coupling coefficient by spacing, brachium etc., hair clip brachium, hair clip spacing, hair clip live width and tap position is determined by traditional method for designing, and optimized by ADS (Advanced DesignSystem, Advanced Design System) emulation.
As shown in Figure 4,5, the simulation result figure of the low-pass micro-strip filter of band trap wave unit, S11 represents return loss, and S21 represents the insertion loss of transmission.
As can be seen from this simulation result, in free transmission range, insertion loss is less than 0.35dB, and return loss is less than-23dB.In 2.4GHz to the 2.484GHz band limits of WLAN (wireless local area network) 802.11b/g/n.Insertion loss is only 0.24dB to 0.32dB, compares integrated filter Insertion Loss much smaller.The echo Insertion Loss at 2.4GHz frequency range place reaches-28dB to-34.8dB.So this application of low pass filters is in 2.4GHz frequency range wireless transmitting device system, performance is very good.The more important thing is at the amount of suppression suppressing second harmonic component, four-time harmonic component and third-harmonic component have at least-31dB, particularly on four-time harmonic, even can reach the amount of suppression of-130dB, directly unwanted signal be attenuated.
The electrical characteristic table of certain traditional lamination paster band pass filter shown in Fig. 6, its frequency range 2.4GHz to 2.5GHz is wider than 2.4GHz to the 2.484GHz band limits of the technical program, and the stability that comparing bulk reveals the technical program is better; The insertion loss of integrated filter is that 2.5dB to 2.8dB is more much bigger than the technical program 0.24dB to 0.32dB, it is much bigger that integrated filter return loss is that 10dB is less than-23dB than the technical program echo Insertion Loss, and the filtering performance that comparing bulk reveals the technical program is better.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a low-pass micro-strip filter, make on a printed circuit, comprise first micro-band, second micro-band, the 3rd micro-band and " mountain " shaped offset of microstrip group of falling, wherein, described micro-band group comprises micro-ly is with the first micro-band section, second micro-band section and the 3rd micro-band section that are connected with described first micro-band, second micro-band and the 3rd respectively, also comprises the 4th micro-band section that band section micro-with three is connected; Described first micro-band section, second micro-band section and the 3rd micro-band section be followed successively by down " mountain " font from left several vertical line, the 4th micro-band section is fall the horizontal line of " mountain " font; Described first micro-band section, second micro-band section and the 3rd micro-band Duan Jun are provided with two bends at middle part; It is characterized in that, in two described bends of same micro-band section, contrary and one end, angular direction is connected, another two ends extend to form two mutual Line Segment respectively to rightabout, described first micro-band section is provided with the first cross shaped microstrip, it is input that described first cross shaped microstrip falls the left end of " mountain " shaped offset of microstrip group relatively, described 3rd micro-band section is provided with the 3rd cross shaped microstrip, and it is output that described 3rd cross shaped microstrip falls the right-hand member of " mountain " shaped offset of microstrip group relatively.
2. low-pass micro-strip filter according to claim 1, is characterized in that, the described straightway in described first micro-band section, second micro-band section and the 3rd micro-band section is parallel to each other and perpendicular to described 4th micro-band section.
3. low-pass micro-strip filter according to claim 1, it is characterized in that, two described bends of described first micro-band section comprise the first bend, the second bend, and wherein said first bend is located at the left of described second bend relative to described second bend;
Two described bends of described second micro-band section comprise the 3rd bend, the 4th bend, and wherein said 3rd bend is located at the right of described 4th bend relative to described 4th bend; And
Two described bends of described 3rd micro-band section comprise the 5th bend, the 6th bend, and wherein said 5th bend is located at the right of described 6th bend relative to described 6th bend.
4. low-pass micro-strip filter according to claim 1, is characterized in that, the bent angle of described bend is fillet, and the angle of the extended line at described fillet two ends is 90 degree.
5. low-pass micro-strip filter according to claim 1, is characterized in that, the angle of described first micro-band section, the 3rd micro-band section and described 4th junction, micro-band section two ends is fillet; The angle of described second micro-band section and described 4th micro-band section junction is right angle.
6. low-pass micro-strip filter according to claim 1, is characterized in that, described first micro-band, second micro-band and the 3rd micro-band are length 93 mil, the rectangle of width 63 mil.
7. low-pass micro-strip filter according to claim 3, is characterized in that, it is 8 mils that described first micro-band section, second micro-band section, the 3rd micro-band section and the 4th micro-band section print width on described printed circuit board.
8. low-pass micro-strip filter according to claim 1, is characterized in that, described low-pass micro-strip filter is operated in 2.4GHz ~ 2.484GHz band limits.
9. low-pass micro-strip filter according to claim 1, is characterized in that, the length of side of described low-pass micro-strip filter is 5.3 millimeters, and width is 5.1 millimeters.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5977847A (en) * | 1997-01-30 | 1999-11-02 | Nec Corporation | Microstrip band elimination filter |
| CN101901950A (en) * | 2010-07-05 | 2010-12-01 | 南京赛格微电子科技有限公司 | Broadband triple-band filter |
| CN202205871U (en) * | 2011-09-01 | 2012-04-25 | 深圳市卓翼科技股份有限公司 | Low-pass micro-strip filter |
-
2011
- 2011-09-01 CN CN201110257177.6A patent/CN102969550B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5977847A (en) * | 1997-01-30 | 1999-11-02 | Nec Corporation | Microstrip band elimination filter |
| CN101901950A (en) * | 2010-07-05 | 2010-12-01 | 南京赛格微电子科技有限公司 | Broadband triple-band filter |
| CN202205871U (en) * | 2011-09-01 | 2012-04-25 | 深圳市卓翼科技股份有限公司 | Low-pass micro-strip filter |
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