CN202034952U - Ultra short wave full frequency band electrically-tunable filter used for handheld communication machine - Google Patents
Ultra short wave full frequency band electrically-tunable filter used for handheld communication machine Download PDFInfo
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- CN202034952U CN202034952U CN2011200141444U CN201120014144U CN202034952U CN 202034952 U CN202034952 U CN 202034952U CN 2011200141444 U CN2011200141444 U CN 2011200141444U CN 201120014144 U CN201120014144 U CN 201120014144U CN 202034952 U CN202034952 U CN 202034952U
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Abstract
The utility model relates to an ultra short wave full frequency band electrically-tunable filter used for a handheld communication machine, which belongs to the technical field of electronic communication equipment. The electrically-tunable filter comprises a filtering unit, a radio frequency input terminal, an input band switching module, an output band switching module, a radio frequency output terminal and a voltage tuning module, wherein the radio frequency input terminal is connected with the input band switching module; the input band switching module, the filtering unit and the output band switching module are sequentially connected; and the output band switching module is also connected with the radio frequency output terminal. The filtering unit is provided with a first resonance filtering unit, a second resonance filtering unit and a third resonance filtering unit that have different tuning scopes from one another and are respectively connected with the voltage tuning module. The electrically-tunable filter is strong in anti-electromagnetic interference capability, enlarges the frequency coverage area and improves the various performances of the communication machine, such as the flexibility, the selectivity, the dynamic range, etc.
Description
Technical field
The utility model relates to a kind of filter, and particularly a kind of hand communication machine belongs to the electronic communication equipment technical field with ultrashort wave full frequency band electrically tunable filter.
Background technology
In recent years, along with the develop rapidly of electronic technology, the application of radio communication technology more and more widely.Radio-frequency front-end is as the important component part of hand communication machine, major function is: when received signal the high-frequency signal that receives is screened, the big high-frequency signal of the power of receiving in the buffering short time, and prevent that the air interference signal of other transmitter from entering this transmitter.Radio-frequency (RF) front-end circuit has crucial effects to the performance of whole receiving system, has directly determined the sensitivity of receiver; The adaptive capacity of large-signal is being determined the dynamic range of receiver; Have intermodulation distortion and the crosstalk etc. of good linearty in can the minimizing system.
The available technology adopting filter carries out the signal filtering processing to the radio-frequency front-end of hand-hold type communication equipment, especially electricity is transferred microwave band-pass filter, it is widely used in microwave multichannel receiver and electronic warfare system, select the frequency that will receive by the control tuning voltage, the speed and the sensitivity of receiver have been improved, use more convenient, but often has following defective: on the one hand, its anti-electromagnetic interference capability is also more weak, on the other hand, because the frequency range that receiver covers compares broad, narrow being difficult to of the tuning range of single filter satisfies, thereby all band performance index of filter are poor, thereby influenced the sensitivity of receiver integral body, selectivity, every performance such as dynamic range.
Therefore, can design a kind of novel filter,, become the technical barrier that those skilled in the art need to be resolved hurrily to overcome above-mentioned defective.
The utility model content
In order to solve the problems of the technologies described above, the utility model aims to provide a kind of novel hand communication machine ultrashort wave full frequency band electrically tunable filter, its anti-electromagnetic interference capability is strong, and has expanded frequency coverage, has improved every performance such as sensitivity, selectivity, dynamic range of transceiver.Its technical scheme that adopts is as follows:
This hand communication machine mainly comprises with ultrashort wave full frequency band electrically tunable filter: filter unit, rf input terminal, input wave band handover module, output wave band handover module, radio-frequency (RF) output end and tuning voltage module, wherein, described rf input terminal is connected with input wave band handover module, described input wave band handover module, filter unit, output wave band handover module connect in turn, and described output wave band handover module also is connected with radio-frequency (RF) output end; Described filter unit has the first resonator, filter unit, the second resonator, filter unit and the 3rd resonator, filter unit that tuning range differs from one another, and they are connected with described tuning voltage module respectively.
Preferably, filter adopts the metal shell encapsulation, and circuit board adopts doubling plate.
Preferably, the filter unit tuning range was 30MHz-90MHz in described first minute, and the filter unit tuning range was 90MHz-225MHz in described second minute, and the filter unit tuning range was 225MHz-512MHz in described the 3rd minute.
Compared with prior art, the utlity model has following advantage:
1. the employing electrically tunable filter has improved the interior fluctuation of sensitivity, noise factor, low strap of receiver, high signal-selectivity, and closely interior frequency with vicinity is not disturbed mutually, and volume is less simultaneously;
2. integrated three sections electrically adjusted band-pass filters, Frequency Band Selection is wide, has improved sensitivity, noise factor, the selectivity of receiver;
3. circuit board material adopts FR4, and the doubling plate design adopts the metal shell encapsulation to guarantee that the SMD encapsulation of the anti-interference condition of complicated electromagnetism is easy to use.
Description of drawings
Fig. 1: the utility model structural representation.
Among the figure: 1, filter unit; 2, rf input terminal; 3, input wave band handover module; 4, output wave band handover module; 5, radio-frequency (RF) output end; 6, the first resonator, filter unit; 7, the second resonator, filter unit; 8, the 3rd resonator, filter unit; 9, tuning voltage module.
Embodiment
Following summary invention thinking of the present utility model and operation principle earlier:
This hand communication machine adopts the LC electric tuning filter method for designing of shaking with ultrashort wave full frequency band electrically tunable filter, the tunable capacitor that changes variable capacitance diode carries out electrically regulated filtering, according to bandwidth, insert loss, the conforming composite request of amplitude is optimized design to filter; It is controlled by wave band and selects corresponding section filter, when adding different direct current tuning voltage then, the capacitance of variable capacitance diode can change, and the resonance frequency of this section resonator also changes, the centre frequency of filter correspondingly is moved, thereby the electricity of realizing filter is transferred.
In fact the LC electrically tunable filter is exactly the simultaneous tuning filter, he forms why use parallel form by the shunt-resonant circuit that several centre frequencies are tuned in W0, because the bias loop complexity needs the stray capacitance of resistance and inductance to be difficult for being absorbed at least during series connection.Select a key element of simultaneous tuning filter to be that this filter can be with simple circuit form realization electric tuning, and other forms of filter is not can not realize electric tuning but the circuit that will realize electric tuning is complicated, and required varactor kind is many, and its electrical characteristics also extremely are difficult for satisfying the demand simultaneously.Design LC electrically tunable filter is actual to be equivalent to design resonance amplifier, and just variable capacitance diode becomes the core of circuit here.Variod tuning of the prior art loop is a lot, and the technology comparative maturity does not repeat them here.
The utility model is described in further detail below in conjunction with accompanying drawing and example:
An embodiment of the present utility model as shown in Figure 1, this hand communication machine mainly comprises with ultrashort wave full frequency band electrically tunable filter: filter unit 1, rf input terminal 2, input wave band handover module 3, output wave band handover module 4, radio-frequency (RF) output end son 5 and tuning voltage module 9, wherein rf input terminal 2 is connected with input wave band handover module 3, input wave band handover module 3, filter unit 1, output wave band handover module 4 connect in turn, and output channel diverter switch 4 is gone back and radio-frequency (RF) output end 5; Have the first resonator, filter unit 6, the second resonator, filter unit 7 and the 3rd resonator, filter unit 8 that tuning range differs from one another in the filter unit 1, and they are connected with tuning voltage module 9 respectively.
Because the frequency range that covers is than broad, the tuning range of single filter can not satisfy the ultrashort wave all band requirement of 30MHz-512MHz, and the performance index of filter are poor.So adopt the method for segmentation to finish, the first resonator, filter unit, 6 tuning ranges are 30MHz-90MHz, the second resonator, filter unit, 7 tuning ranges are 90MHz-225MHz, and the 3rd resonator, filter unit 8 tuning ranges are 225MHz-512MHz.Every index obtains reasonable optimization behind the filter segmented tuning.
Input wave band handover module 3, output wave band handover module 4 for example are the SP3T switch, and it also can be realized by a common switch.
The tuning range that tuning voltage module 9 is selected according to input wave band handover module 3, output wave band handover module 4 is exported corresponding tuning voltage to corresponding resonance filter, selects corresponding frequency range.
In order to strengthen the antijamming capability of this filter, its circuit board material adopts FR4, the doubling plate design, and adopt the metal shell encapsulation, SMD encapsulating structure guarantees that its volume is small and exquisite, easy to use.
This ultrashort wave all band location filter has altogether been expanded frequency coverage greatly, has improved sensitivity, selectivity, the dynamic range of transceiver, can reach following technical indicator:
| Index name | Index test |
| Working frequency range | ?30-512MHZ |
| Insertion Loss | ?≤6.0dB |
| BW30dB: BW3dB squareness factor | ?≤7∶1 |
| Passband fluctuation | ?≤2dB |
| The 3dB relative bandwidth | ?4～5.5％ |
| The 3dB relative bandwidth changes | ?≤1.5％ |
| Band standing internal wave ratio | ?≤2.0∶1 |
| Power | ?1W |
| Tuning voltage | ?1～20V |
| Input dynamic range P-1 | ?＞＝0dB |
| Operating temperature range | ?-55℃～+85℃ |
| Storage temperature range | ?-60℃～+105℃ |
| Overall dimension | 36*30*9 (length * wide * high unit: mm) |
With way of example the utility model is illustrated above, but the utility model is not limited to above-mentioned specific embodiment, all any change or modification of doing based on the utility model all belong to the claimed scope of the utility model.
Claims (3)
1. a hand communication machine is with ultrashort wave full frequency band electrically tunable filter, it is characterized in that, comprise: filter unit (1), rf input terminal (2), input wave band handover module (3), output wave band handover module (4), radio-frequency (RF) output end (5) and tuning voltage module (9), wherein, described rf input terminal (2) is connected with input wave band handover module (3), described input wave band handover module (3), filter unit (1), output wave band handover module (4) connect in turn, and described output wave band handover module (4) also is connected with radio-frequency (RF) output end (5); Described filter unit (1) has the first resonator, filter unit (6), the second resonator, filter unit (7) and the 3rd resonator, filter unit (8) that tuning range differs from one another, and they are connected with described tuning voltage module (9) respectively.
2. hand communication machine according to claim 1 is characterized in that with ultrashort wave full frequency band electrically tunable filter filter adopts the metal shell encapsulation, and circuit board adopts doubling plate.
3. hand communication machine according to claim 1 ultrashort wave full frequency band electrically tunable filter, it is characterized in that, filter unit (6) tuning range was 30MHz-90MHz in described first minute, filter unit (7) tuning range was 90MHz-225MHz in described second minute, and filter unit (8) tuning range was 225MHz-512MHz in described the 3rd minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200141444U CN202034952U (en) | 2011-01-17 | 2011-01-17 | Ultra short wave full frequency band electrically-tunable filter used for handheld communication machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200141444U CN202034952U (en) | 2011-01-17 | 2011-01-17 | Ultra short wave full frequency band electrically-tunable filter used for handheld communication machine |
Publications (1)
| Publication Number | Publication Date |
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| CN202034952U true CN202034952U (en) | 2011-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200141444U Expired - Fee Related CN202034952U (en) | 2011-01-17 | 2011-01-17 | Ultra short wave full frequency band electrically-tunable filter used for handheld communication machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152003A (en) * | 2013-01-18 | 2013-06-12 | 西安电子科技大学 | Ultra-wide band electrically-tunable band-pass filter set and frequency control method thereof |
| CN104506801A (en) * | 2014-12-17 | 2015-04-08 | 南京莱斯信息技术股份有限公司 | Satellite communication in motion emergency communication command system on basis of 3G (third generation) and satellite link |
| CN109067376A (en) * | 2018-08-15 | 2018-12-21 | 中国电子科技集团公司第五十四研究所 | A kind of ultrashort wave preselection filter chip based on sip technique |
-
2011
- 2011-01-17 CN CN2011200141444U patent/CN202034952U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152003A (en) * | 2013-01-18 | 2013-06-12 | 西安电子科技大学 | Ultra-wide band electrically-tunable band-pass filter set and frequency control method thereof |
| CN103152003B (en) * | 2013-01-18 | 2016-02-10 | 西安电子科技大学 | Ultra wide band electrically tunable band-pass filter group and control method for frequency thereof |
| CN104506801A (en) * | 2014-12-17 | 2015-04-08 | 南京莱斯信息技术股份有限公司 | Satellite communication in motion emergency communication command system on basis of 3G (third generation) and satellite link |
| CN109067376A (en) * | 2018-08-15 | 2018-12-21 | 中国电子科技集团公司第五十四研究所 | A kind of ultrashort wave preselection filter chip based on sip technique |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111109 Termination date: 20200117 |
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| CF01 | Termination of patent right due to non-payment of annual fee |