CN204885378U - Radio frequency band pass filter - Google Patents
Radio frequency band pass filter Download PDFInfo
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- CN204885378U CN204885378U CN201520485086.1U CN201520485086U CN204885378U CN 204885378 U CN204885378 U CN 204885378U CN 201520485086 U CN201520485086 U CN 201520485086U CN 204885378 U CN204885378 U CN 204885378U
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- frequency band
- serpentine
- radio frequency
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- feeder
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Abstract
The utility model discloses a radio frequency band pass filter, include through two cascaded resonant cavities of coupled modes, form a narrowband coupling gap, each between two resonant cavities the resonant cavity includes: feeder, one end and short serpentine that the feeder is connected, one end and long serpentine that the feeder is connected and the interdigital line of being connected with the other end of the other end of lacking the serpentine, long serpentine respectively of coupling, two resonant cavities go out the degenerate mode of self through long, short serpentine and the interdigital line of coupling difference resonance, later merge two degenerate mode through the coupling gap between two resonant cavities to produce new resonance. The utility model provides a radio frequency band pass filter on the one hand, can cover big dipper GPSGLONASS at the passband simultaneously to the suppression of realization more than the 20dB of GSM frequency band, on the other hand, this kind of wave filter can be realized on ordinary more low -cost PCB circuit board and ceramic material.
Description
Technical field
The utility model relates to band pass filter (bandpassfilter), particularly relates to one and is applied to navigation field and the radio frequency band filter that simultaneously can cover the Big Dipper/GPS/GLONASS.
Background technology
Along with Beidou satellite navigation system on December 27 formal provider use in 2012, successfully indicate that China has broken Russia and the U.S. monopoly position in this field.
The application technology of existing Beidou satellite navigation is quite ripe.But how when realizing the function of Beidou navigation, the GPS(GlobalPositioningSystem of compatible existing maturation, global positioning system) and GLONASS(GLOBALNAVIGATIONSATELLITESYSTEM, GPS (Global Position System)) receiver module, and do not increase cost, be that can the present Big Dipper realize the maximum challenge of industrialization.
Till now, realize the solution of the low cost of the simultaneously compatible Big Dipper/GPS/GLONASS, one of them needs the challenge solved to be exactly that realization can the radio-frequency filter of the compatible Big Dipper/GPS/GLONASS simultaneously.SAW filter (surfaceacousticwave, Surface Acoustic Wave Filter) on existing market and FBAR radio-frequency filter (FilmBulkAcousticResONator, the filtering of membrane well acoustic resonance) all cannot meet this requirement.
Therefore, prior art existing defects, needs to improve.
Utility model content
The purpose of this utility model overcomes the deficiencies in the prior art, provides one to be applied to navigation field and can cover the radio frequency band filter of the Big Dipper/GPS/GLONASS simultaneously.
The technical solution of the utility model is as follows: the utility model provides a kind of radio frequency band filter, comprise two resonant cavitys by coupled modes cascade, a coupling gap, arrowband is formed between two resonant cavitys, described in each, resonant cavity comprises: feeder line, the short serpentine that one end is connected with described feeder line, the long serpentine that one end is connected with described feeder line, and respectively with the other end of short serpentine, the interdigital line of coupling of the other end connection of long serpentine, described two resonant cavitys are by long, short serpentine and the interdigital line of coupling respectively resonance go out self degenerate mode, by the coupling gap between two resonant cavitys, two degenerate modes are merged afterwards, to produce new resonance.
In resonant cavity described in each, the interdigital line of described coupling is between described long serpentine and short serpentine.
The interdigital line of described coupling comprises the first interdigital line and the second interdigital line that intercouple, and described first interdigital line is connected with short serpentine, and described second interdigital line is connected with long serpentine.
Described feeder line is connected with the outside of described resonant cavity is vertical, described two feeder lines with the center of filter for symmetric points become central rotation symmetrical.
The feeder line of a described resonant cavity is incoming feeder, and the feeder line of another resonant cavity is output feeder.
Described two resonant cavitys with the center of filter for symmetric points become central rotation symmetrical.
Described two are coupled interdigital line with the center of filter for symmetric points become central rotation symmetrical.
The frequency band of described filter is logical covers 1.55GHz-1.605GHz, and centre frequency is 1.575HGz.
Described filter is formed on aluminium base or ceramic dielectric substrate.
Adopt such scheme, radio frequency band filter of the present utility model has following characteristics:
1, this band pass filter adopts the double-deck concept be coupled due to it, has less size and area, meet the requirement of the miniaturization of Modern Communication System than traditional dual-mode microstrip band-pass filter;
2, this filter is owing to have employed microstrip line as input/output terminal, directly integrated with other circuit structure easily;
3, this filter can realize on the pcb board of common low cost, and structure is simple, is applicable to standardized production, also can realizes in ceramic process;
4, this filter can level be associated on common circuit board and becomes active antenna module together together with LNA, antenna, can realize the function of filter when not increasing any cost;
5, this band pass filter is owing to have employed dual resonance structure, can realize broad passband performance, and passband covers the Big Dipper, GPS, GLONASS signal simultaneously, realizes the suppression to GSM frequency band simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model radio frequency band filter.
Fig. 2 is that the utility model radio frequency band filter is implemented in the on-chip test result of FR4.
Fig. 3 is the test result that the utility model radio frequency band filter and active antenna cascade realize conjugate impedance match.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Refer to Fig. 1, the utility model provides a kind of radio frequency band filter, on the one hand, can cover the Big Dipper/GPS/GLONASS at passband simultaneously, and realizes the suppression at more than the 20dB of GSM frequency band; On the other hand, this filter can realize in the PCB of common low cost more and ceramic material.Concrete, this radio frequency band filter comprises two resonant cavitys 2 by coupled modes cascade, form a coupling gap, arrowband 4 between two resonant cavitys 2, described in each, resonant cavity 2 comprises: the long serpentine 26 that the short serpentine 24 that feeder line 22, one end are connected with described feeder line 22, one end are connected with described feeder line 22 and the interdigital line 28 of coupling be connected with the other end of short serpentine 24, the other end of long serpentine 26 respectively.Described two resonant cavitys 2 by long and short serpentine 26,24 and be coupled interdigital line 28 respectively resonance go out self degenerate mode, two degenerate modes are merged, to produce new resonance by the coupling gap 4 between two resonant cavitys 2 afterwards.Physically say, be equivalent to achieve secondary resonance filter by two grade coupled modes.In addition, resonant cavity 2 described in each is all made up of the serpentine of the different Slow-wave effect of two ends length and the interdigital line 28 of banded coupling, such one side is due to the structure of serpentine, greatly improve the total length of the effective microstrip line of overall filter, make the area more efficiently utilizing micro-strip resonantor; On the other hand owing to have employed interdigital line 28 structure of banded coupling, add the coupling amount of each resonant cavity 2 self substantially.
The radio frequency band filter that the utility model provides adopts novel framework, have employed the concept of double-deck coupling, solve the problem that conventional microstrip filter volume is excessive, have less size than traditional bimodule band-pass filter, have Insertion Loss and better Out-of-band rejection in lower band.
In addition, owing to have employed the structure of serpentine and interdigital line 28 cascade resonator of banded coupling, the characteristic of the resonance frequency of each resonant cavity 2 is made to be free to regulate, thus the adjustment realized more easily this filter band wide feature, resonance frequency and Out-of-band rejection performance, make this filter property easy of integration under the environment of different pcb board, realizability increases greatly.
After described filter can be placed in low noise amplifier, after realizing conjugate impedance match, provide the low cost active antenna scheme of alternative original filter device.
Further, in resonant cavity 2 described in each, the interdigital line of described coupling 28 is between described long serpentine 26 and short serpentine 24.Described two are coupled interdigital line 28 with the center of filter for symmetric points become central rotation symmetrical.The interdigital line of described coupling 28 comprises the first interdigital line 31 and the second interdigital line 32 intercoupled, and described first interdigital line 31 is connected with short serpentine 24, and described second interdigital line 32 is connected with long serpentine 26.Further, the shape of the first interdigital line 31 and the second interdigital line 32 and size also can free adjustment, thus can control resonance frequency and the bandwidth of filter further.
Preferably, described feeder line 22 is connected with the outside 33 of described resonant cavity 22 is vertical, described two feeder lines 222 with the center of filter for symmetric points become central rotation symmetrical.Should be noted that: the position of described two feeder lines 22 can free adjustment, can increase the property easy of integration of filter like this.Described in each, the resistance of feeder line 22 is 50 ohm.Concrete, the feeder line 22 of a described resonant cavity 2 is incoming feeder, and the feeder line 22 of another resonant cavity 2 is output feeder.
Described two resonant cavitys 2 with the center of filter for symmetric points become central rotation symmetrical.The width of long serpentine 26 and short serpentine 24 and bending number of times and shape can free adjustment, so entire area that can reduce filter further.Can also by the performance regulating the coupling width in gap 4 and the length of coupled wall to control filter.
In the present embodiment, based on said structure, the frequency band of described filter is logical covers 1.55GHz-1.605GHz, and centre frequency is 1.575HGz.
Described filter is formed on aluminium base or ceramic dielectric substrate, the scheme of low cost can be realized, also can be realized by the technique of LTCC (LowTemperatureCo-firedCeramic, LTCC), realize the high-performance suitable with Surface Acoustic Wave Filter.In the present embodiment, it is FR4(epoxy glass fiber plate that described filter is formed at material, epoxy plate) substrate on, the thickness of this substrate is 0.8mm, and as shown in Figure 2, concrete measurement data as shown in Figure 2 for the test result that this filter is tested separately over the substrate, 1. waveform is dB(S(1,1)), 2. waveform is dB(S(1,2)), wherein m1 place, freq=1.577GHz, dB(S(1,2))=-2.653.In addition, this filter on same circuits sheet material with the active antenna of a LNA Integrated design, cascade realizes conjugate impedance match, test result after conjugate impedance match as shown in Figure 3, concrete measurement data as shown in Figure 3: M1 place, freq=1.558GHz, dB(S(1,2))=26.939; M2 place, freq=1.575GHz, dB(S(1,2))=26.940; M3 place, freq=1.603GHz, dB(S(1,2))=26.351; M4 place, freq=1.805GHz, dB(S(1,2))=1.196; M5 place, freq=1.885GHz, dB(S(1,2))=17.079; M6 place, freq=935.0MHz, dB(S(1,2))=16.366; M7 place, freq=960.0MHz, dB(S(1,2))=14.849.
These are only preferred embodiment of the present utility model, be not limited to the utility model, all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (9)
1. a radio frequency band filter, it is characterized in that, comprise two resonant cavitys by coupled modes cascade, a coupling gap, arrowband is formed between two resonant cavitys, described in each, resonant cavity comprises: feeder line, the short serpentine that one end is connected with described feeder line, the long serpentine that one end is connected with described feeder line, and respectively with the other end of short serpentine, the interdigital line of coupling of the other end connection of long serpentine, described two resonant cavitys are by long, short serpentine and the interdigital line of coupling respectively resonance go out self degenerate mode, by the coupling gap between two resonant cavitys, two degenerate modes are merged afterwards, to produce new resonance.
2. radio frequency band filter according to claim 1, is characterized in that, in resonant cavity described in each, the interdigital line of described coupling is between described long serpentine and short serpentine.
3. radio frequency band filter according to claim 1, is characterized in that, the interdigital line of described coupling comprises the first interdigital line and the second interdigital line that intercouple, and described first interdigital line is connected with short serpentine, and described second interdigital line is connected with long serpentine.
4. radio frequency band filter according to claim 1, is characterized in that, described feeder line is connected with the outside of described resonant cavity is vertical, described two feeder lines with the center of filter for symmetric points become central rotation symmetrical.
5. radio frequency band filter according to claim 1, is characterized in that, the feeder line of a described resonant cavity is incoming feeder, and the feeder line of another resonant cavity is output feeder.
6. radio frequency band filter according to claim 1, is characterized in that, described two resonant cavitys with the center of filter for symmetric points become central rotation symmetrical.
7. radio frequency band filter according to claim 1, is characterized in that, described two are coupled interdigital line with the center of filter for symmetric points become central rotation symmetrical.
8. radio frequency band filter according to claim 1, is characterized in that, the frequency band of described filter is logical covers 1.55GHz-1.605GHz, and centre frequency is 1.575HGz.
9. radio frequency band filter according to claim 1, is characterized in that, described filter is formed on aluminium base or ceramic dielectric substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520485086.1U CN204885378U (en) | 2015-07-07 | 2015-07-07 | Radio frequency band pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520485086.1U CN204885378U (en) | 2015-07-07 | 2015-07-07 | Radio frequency band pass filter |
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| Publication Number | Publication Date |
|---|---|
| CN204885378U true CN204885378U (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520485086.1U Expired - Fee Related CN204885378U (en) | 2015-07-07 | 2015-07-07 | Radio frequency band pass filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993196A (en) * | 2015-07-07 | 2015-10-21 | 深圳市西博泰科电子有限公司 | Radio-frequency band-pass filter |
| CN105785757A (en) * | 2016-04-28 | 2016-07-20 | 歌尔声学股份有限公司 | Watch antenna device and electronic watch |
| CN105785756A (en) * | 2016-05-05 | 2016-07-20 | 安徽华米信息科技有限公司 | Timing method, device and system |
-
2015
- 2015-07-07 CN CN201520485086.1U patent/CN204885378U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993196A (en) * | 2015-07-07 | 2015-10-21 | 深圳市西博泰科电子有限公司 | Radio-frequency band-pass filter |
| CN105785757A (en) * | 2016-04-28 | 2016-07-20 | 歌尔声学股份有限公司 | Watch antenna device and electronic watch |
| CN105785757B (en) * | 2016-04-28 | 2018-05-01 | 歌尔股份有限公司 | Wrist-watch antenna assembly and electronic watch |
| CN105785756A (en) * | 2016-05-05 | 2016-07-20 | 安徽华米信息科技有限公司 | Timing method, device and system |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20210707 |