CN1045863C - Pager - Google Patents
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- Publication number
- CN1045863C CN1045863C CN93117467A CN93117467A CN1045863C CN 1045863 C CN1045863 C CN 1045863C CN 93117467 A CN93117467 A CN 93117467A CN 93117467 A CN93117467 A CN 93117467A CN 1045863 C CN1045863 C CN 1045863C
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- Prior art keywords
- local oscillator
- frequency
- shielding case
- antenna
- circuit board
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Abstract
The present invention provides a wireless paging receiver. Through a frame-shaped antenna is combined with a direct frequency conversion mode, good receiving sensitivity can also be obtained, wherein a local oscillator 3 and a frequency mixer 4 are combined into a whole and are shielded by a shielding casing to form modularization. Shielding is carried out by using the shielding casing 7, and the output of the local oscillator 3 can not be fed back to an antenna 1.
Description
The present invention relates to radio paging receiver.
Existing radio paging receiver receives the radiofrequency signal that base station sends, to this receiving signal demodulation, when the paging signal of distributing to receiver itself is arranged, by report users such as sound, light, vibrations.Its receive mode has and possesses antenna 21 as shown in Figure 3, the superheterodyne reception mode and the Direct Conversion mode of radio frequency amplifier 22, filter 23, local oscillator 24, frequency mixer 25, filter 26, demodulator 27 and control unit 28.In addition, reception antenna has clavate, billboard antenna, and the coil antenna of framework shape.
The composition of existing radio paging receiver is the example that the superheterodyne reception mode combines with the clavate coil antenna mostly, the example of shielding only then has the scheme of covering barricade on the scheme of local oscillator 24 shieldings, the modular scheme of voltage controlled oscillator (VCO) that makes local oscillator 24, the frequency mixer 25, and the scheme of barricade on the oscillator unit cover of logical circuit.
Like this, adopt the screen method in the above-mentioned radio paging receiver in the past, not only suppress logic noise, and it is also effective to tackle spurious signal.
In the above-mentioned existing example, the advantage of the radio paging receiver of Direct Conversion mode is that receive frequency is identical with local oscillation frequency, does not have the such intermediate frequency of superheterodyne reception mode, thereby does not need the filter relevant with intermediate frequency, can cut down number of components.But existing problems again on the other hand are promptly because receive frequency is identical with local oscillation frequency, so when the output of local oscillator feeds back to antenna, will make the receiving sensitivity variation.
And above-mentioned its advantage of framework shape antenna is, can guarantee the loop area maximum in midget receiver, thereby can improve antenna sensitivity that the problem of the noise that internal circuit is sent out that checks in is arranged but then.
Therefore, the receiver that framework shape antenna and Direct Conversion mode are combined, the problem of existence is that local oscillator and antenna distance are nearer, the output of local oscillator feeds back to antenna easily, so the receiving sensitivity variation.
Therefore, the shielding of local oscillator is necessary, but the receiver that framework shape antenna and Direct Conversion mode are combined, as above-mentioned prior art, only local oscillator is shielded, or only make the frequency mixer shielding, so abundant inadequately to the inhibition of spurious emissions, the output of local oscillator can feed back to antenna.
The present invention solves the existing problem of this class just, although its purpose is to provide a kind of framework shape antenna and Direct Conversion mode is combined, and can not make the receiving sensitivity variation, and can obtain the radio paging receiver of good reception-sensitivity.
In order to achieve the above object, radio paging receiver of the present invention comprises: framework shape antenna means; The reception means of the Direct Transform receive mode that receive frequency is identical with local oscillation frequency is characterized in that, the local oscillator and the frequency mixer that constitute described reception means are shielded by shielding case, and make module.
In addition, can be installed in the one side of printed circuit board (PCB) to major general's local oscillator and frequency mixer, and another side is as ground plane, again this printed circuit board (PCB) is included in the shielding case and shielded, and make the coupling part of bottom line holding wires such as power line, input-output line and control line stretch out above-mentioned shielding case, make modularization.
Therefore,, local oscillator and frequency mixer are shielded, can be suppressed spurious emissions, its feedback to antenna is reduced according to the present invention.
Fig. 1 is the general block diagram of radio paging receiver in expression one embodiment of the invention.
Fig. 2 is used to illustrate with the local oscillator of above-mentioned radio paging receiver and the exploded perspective view of mixer moduleization.
Fig. 3 is the general block diagram of the existing routine radio paging receiver of expression.
Followingly one embodiment of the invention is illustrated with reference to accompanying drawing.
Fig. 1 and Fig. 2 illustrate the Direct Conversion formula radio paging receiver in one embodiment of the invention, and Fig. 1 is a general block diagram, and Fig. 2 is used to illustrate the exploded perspective view that makes local oscillator and mixer moduleization.
Among Fig. 1,1 is the framework antenna, and 2 is radio frequency (RF) amplifier, and 3 is local oscillator, and 4 is frequency mixer, and 5 is demodulator, and 6 is control unit.
Local oscillator 3 and frequency mixer 4 are integrated, and are shielded by shielding case 7, make modularization.If describe in detail, then as shown in Figure 2, be installed on the one side of miniature printed circuit board 8 to major general's local oscillator 3 and frequency mixer 4, the another side of printed circuit board (PCB) 8 is made ground plane.The end of printed circuit board (PCB) two minor faces is symmetrical arranged the coupling part 9 of bottom line holding wires such as power line, input-output line and control line.In addition, shielding case 7 is made for metal, is made up of with the cap 11 that cooperates with body 10 body 10, and body 10 forms breach 12,13 in the end of its two short side plate respectively with cap 11.And printed circuit board (PCB) 8 is included in the body 10 by its ground plane one side, and ground plane contacts with the inner surface 14 of body 10, and holding wire coupling part 9 is protruding from breach.Body 11 cooperates with cap 10.So, have only the holding wire coupling part protruding, and the local oscillator 3 on the printed circuit board (PCB) 8, frequency mixer 4 etc. are fully by shielding case 7 shieldings from the breach 12,13 of shielding case 7.
Below with regard to said structure it is moved more detailed description.
Amplify by radio frequency amplifier 2 through antenna 1 back from the radiofrequency signal that base station sends.Local oscillator 3 is to vibrate with the identical frequency of radiofrequency signal; In frequency mixer 4, the radiofrequency signal of amplifying by radio frequency amplifier 2 and the output mixing of local oscillator 3, and take out its phase difference as output.This phase difference is demodulated to baseband signal by demodulator 5, judges the paging signal that whether has receiver itself in this signal by control unit again.At this moment, as mentioned above, local oscillator 3 is integrated with frequency mixer 4, and is shielded by shielding case, makes modularization, so do not have signal from local oscillator 3, frequency mixer and connecting line thereof feed back to antenna 1 after leaking.
Like this, according to the foregoing description, local oscillator 3 is integrated with frequency mixer 4, and is shielded by shielding case 7, thus can suppress the unwanted emission of local oscillator 3, thereby can guarantee that receiving sensitivity is good.And, according to the foregoing description, when local oscillator 3 adopts voltage controlled oscillator (VCO), owing to do not have the influence of extraneous noise to the VCO frequency of oscillation, so can guarantee that receiver selectivity is good.
In sum, according to the present invention, local oscillator and frequency mixer are integrated, and are shielded by shielding case, make modularization, thereby can suppress the unwanted emission of local oscillator, its feedback to antenna is reduced, thereby can obtain good reception sensitivity.
Claims (2)
1. a radio paging receiver comprises: framework shape antenna means; The reception means of the Direct Transform receive mode that receive frequency is identical with local oscillation frequency is characterized in that,
The local oscillator and the frequency mixer that constitute described reception means are shielded by shielding case, and make module.
2. radio paging receiver as claimed in claim 1, it is characterized in that, be installed in the one side of printed circuit board (PCB) to major general's local oscillator and frequency mixer, described printed circuit board (PCB) opposite face becomes ground plane, again described printed circuit board (PCB) is placed in the shielding case and shielded, allow the coupling part of bottom line holding wires such as power line, input-output line and control line expose, make module from described shielding case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93117467A CN1045863C (en) | 1993-09-09 | 1993-09-09 | Pager |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93117467A CN1045863C (en) | 1993-09-09 | 1993-09-09 | Pager |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1100246A CN1100246A (en) | 1995-03-15 |
| CN1045863C true CN1045863C (en) | 1999-10-20 |
Family
ID=4992019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93117467A Expired - Fee Related CN1045863C (en) | 1993-09-09 | 1993-09-09 | Pager |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1045863C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0497116A2 (en) * | 1991-02-01 | 1992-08-05 | HENZE, Werner | RDS broadcast receiver |
| US5150243A (en) * | 1989-06-12 | 1992-09-22 | Fujitsu Limited | Method and apparatus for monitoring an optical network interface |
-
1993
- 1993-09-09 CN CN93117467A patent/CN1045863C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5150243A (en) * | 1989-06-12 | 1992-09-22 | Fujitsu Limited | Method and apparatus for monitoring an optical network interface |
| EP0497116A2 (en) * | 1991-02-01 | 1992-08-05 | HENZE, Werner | RDS broadcast receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1100246A (en) | 1995-03-15 |
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| 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 | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |