CN2209839Y - Antiradiation antenna for hand communication apparatus - Google Patents

Abstract

The utility model relates to an anti-radiation antenna for hand-held communication equipment. The upper end of the body is provided with an n-shaped bottom bracket, and the rear side of the bottom bracket is provided with shallow slots. The antenna vertically arranged in the sleeve barrel of the body can freely stretch in the sleeve barrel. The bottom of the antenna is provided with a spherical joint body, and the rear side of the bottom bracket is provided with shallow slots which enable the antenna to bend 90 DEG to a transversal horizontal position from the original vertical position. The antenna can be vertically arranged. Owing to the change of polarization mode, the strong magnetic field can be transferred to a position far from the head of human body, so that the radiation effect can be avoided. The utility model has the advantages of simple structure and practicality.

Description

Antiradiation antenna for hand communication apparatus

The utility model relates to a kind of radiation-proof antenna with new polarization manner for hand communication apparatus, belongs to the technical field of the antenna of communication apparatus.

Hand-hold communication appliance uses very extensive in the big city at present, it has light, be easy to carry, get in touch characteristics easily, can increase work efficiency, the antenna assembly of these hand-hold communication appliances, volume is bigger, can not fold its electromagnetic radiation, user's health is brought harmful effect, demand urgently improving.

The purpose of this utility model is that a kind of radiation-proof antenna with new polarization manner for hand communication apparatus will be provided, it can overcome above-mentioned shortcoming, mainly to the two antenna polarization modes change, make the radianting capacity difference of antenna at different directions, form the feeble field district of certain position, thereby reached radiation-resistant purpose.

The purpose of this utility model is achieved in that

One long sleeve is arranged in the body, antenna can stretch in sleeve, antenna end is a ball-joint body, in the body upper end JiongZi Xing collet is housed, the collet rear side leaves a groove, antenna can bend 90 ° to the right and become the horizontal direction position, and body upper has the signal source of a coil as antenna, and ground wire is equipped with in the collet front side.

Fig. 1 is the hand-hold communication appliance schematic diagram.

Fig. 2 is the hand-hold communication appliance schematic diagram.

Fig. 3 is the schematic diagram of best power.

Fig. 4 is an antenna arrangement direction schematic diagram.

Fig. 5 is the schematic diagram of Fig. 4.

Fig. 6 is the emission characteristics figure of accompanying drawing 4.

Fig. 7 is the antenna arrangement schematic diagram.

Fig. 8 is the schematic diagram of Fig. 7.

Fig. 9 is the reflection characteristic figure of Fig. 7.

Now in conjunction with the accompanying drawings the structure of radiation-proof antenna with new polarization manner for hand communication apparatus is described in detail.

By Fig. 1, body (4) itself has long sleeve (4), antenna (1) can stretch and imbed in this sleeve (4), can be pulled outwardly by sleeve (4) during use and stretch, erection position as shown in FIG., the end of antenna (1) has a ball-joint body (5), in body (4) upper end JiongZi Xing collet (3) is housed, collet (3) rear side has fluting, antenna (1) can bend 90 ° backward and become the horizontal direction position, the signal source of one coil (7) as antenna arranged at body (4) top, and ground wire (2) is equipped with in the front side of collet (2).

By Fig. 2, the some of antenna (1) is in ring shielding part (8), outside another partly is exposed to, can transfer vertical erection position to by the transverse horizontal position.

This antenna basic principle is to change two antenna polarization modes, new polarization is just changed into or horizontal level erectting antenna, in conjunction with effective supplementary measures, the antenna that makes communication apparatus is in different direction radianting capacities, the feeble field that forms certain position is distinguished by force, be called the place of safety, in this place of safety, can reach radiation-resistant purpose, just high field is transferred to away from human head location; Therefore can again in conjunction with principle of electromagnetic shield-ing, and protect user's head to exempt from the radiation of strong electromagnetic wave the conversion of transmitting antenna relative position in the relevant position.

Now be example with the mobile telephone hand-held set, generally press the design of 900MHZ frequency modulation, design by the 900MHZ FM signal, reasonably select antenna chi material for use, inductance value, distributed capacitance, thereby the impedance phase coupling of antenna characteristics impedance and the output of mobile telephone transmitter, make antenna emitted power maximum, the standing-wave ratio minimum has improved transmitting power below 1.2.Design objective is inductance value 8.85nh, capacitance 3.3pf, and characteristic impedance is that the mobile phones design formula of 50 Ω is:

Separate

$\mathrm{f\; =}\frac{1}{\mathrm{2Ⅱ}\sqrt{\mathrm{LC}}}\mathrm{=\; 900MHZP\; =}\sqrt{\frac{L}{C}}\mathrm{=\; 50\Omega }$

∴C＝3.54pf

L＝8.85nh

Antenna impedance equals the transmitter internal resistance, and the antenna uptake is high-power.According to: the schematic diagram of accompanying drawing 3(best power).

$\mathrm{I\; =}\frac{E}{\mathrm{Ri\; +\; X}}{\mathrm{P=I}}^2\mathrm{·X\; =}\frac{E^2}{{\mathrm{(Ri\; +\; X)}}^2}\mathrm{·X}\frac{\mathrm{dp}}{\mathrm{dX}}=\frac{E^2{\mathrm{(Ri\; +\; X)}}^2{\mathrm{－\; 2(Ri\; +\; X)·E}}^{2}X}{{\mathrm{(Ri\; +\; X)}}^4}=\frac{E^2\mathrm{(Ri\; －\; X)}}{{\mathrm{(Ri\; +\; X)}}^3}$

Make (dp)/(dx)=a 0 (E ²(Ri-X))/((Ri+X) ²)=0

∴Ri－X＝0 ∴X＝Ri

Illustrate: Rfz=Ri then: load (antenna) power maximum.

This principle is applicable to various wireless telecommunications hand-held sets (comprising mobile telephone, speakerphone, intercom, wireless telecommunications systems such as radio telephone).

The external form of antenna and length are according to the appropriate design antenna shapes according to frequency of utilization with the inductance value of 1/4 wavelength and 3/4 wavelength, make it to mate with hand-held set.

By Fig. 4,5,6, antenna (1) erect to be arranged, the ground wire of a side (2) ground connection can capacitor C 1 link to each other between inductance L 1 and the ground wire (2), and its reflection characteristic is shown in the waveform of Fig. 6, and its standing wave is infinity.

By Fig. 7,8,9, its antenna (1) transverse arrangement of turbo, the ground wire of a side (2) ground connection.

Ground connection after its inductance L 2 and capacitor C 2, C3 are in parallel.

Its emission characteristics is shown in the waveform of Fig. 9, and its standing wave also is 1.1.

Compared with prior art, radiation-proof antenna with new polarization manner for hand communication apparatus has following advantages.

1. by new polarization mode, high field is transferred to the position away from the head part, makes head not be subjected to the effect of strong electromagnetic wave radiation.

2. reasonable in design, it is big to have overcome original antenna volume, the shortcoming that can not fold.

3. the radiation-proof antenna of new polarization mode is than the radiation-proof antenna high directivity of other form, and the loss of signal is little, advantages such as sensitivity height.

Claims (1)

1, a kind of radiation-proof antenna with new polarization manner for hand communication apparatus, it is characterized in that: long sleeve (4) is arranged in the body (4), antenna (1) can stretch in sleeve (4), antenna (1) end is a ball-joint body (5), in body (4) upper end ㄇ font collet (3) is housed, collet (3) rear side leaves a groove, and antenna (1) can bend 90 ° to the right and become the horizontal direction position, the signal source of one coil (7) as antenna arranged at body (4) top, and ground wire (2) is equipped with in collet (3) front side.

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