CN220122896U - VHF frequency band two-combiner - Google Patents
VHF frequency band two-combiner Download PDFInfo
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- CN220122896U CN220122896U CN202320880055.0U CN202320880055U CN220122896U CN 220122896 U CN220122896 U CN 220122896U CN 202320880055 U CN202320880055 U CN 202320880055U CN 220122896 U CN220122896 U CN 220122896U
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- 238000002955 isolation Methods 0.000 abstract description 11
- 238000003780 insertion Methods 0.000 abstract description 6
- 230000037431 insertion Effects 0.000 abstract description 6
- 238000004891 communication Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a VHF frequency band two-way combiner, which comprises a first bridge, a second bridge, a third bridge, a first combined frequency hopping filter module and a second combined frequency hopping filter module; the output ends of the first bridge and the second bridge are respectively connected with the input ends of the first combined frequency hopping filter module and the second combined frequency hopping filter module, and the output ends of the first combined frequency hopping filter module and the second combined frequency hopping filter module are respectively connected with the third bridge; the first bridge and the second bridge receive external radio frequency signals; the first combined frequency hopping filter module and the second combined frequency hopping filter module respectively combine the received radio frequency signals and output the radio frequency signals to a third bridge; the third bridge outputs the two combined radio frequency signals to the outside. The utility model reduces the use of the primary combining bridge, effectively reduces the insertion loss of the combiner, and improves the isolation between channels by utilizing the out-of-band high-resistance characteristic of the combining filter.
Description
Technical Field
The utility model belongs to the field of ultra-short wave radio frequency combiner, and particularly relates to a VHF frequency band two-combiner.
Background
In some high-power vehicle-mounted ultrashort wave wireless communication systems, the number of VHF frequency band antennas is required to be reduced to meet the loading use requirement under the influence of the physical space of a vehicle roof and the electromagnetic environment of the whole vehicle. The common means is that the input/output radio frequency signals of two radio stations are connected to two combiners, and the two radio frequency signals are combined to one radio frequency channel, so that the two radio stations share one antenna to receive and transmit simultaneously. The traditional combiner adopts a filtering unit consisting of two groups of bridges and a high-power frequency hopping filter, the combining is realized in a cascading mode, the cascading use of the filtering unit leads to the large circuit scale of the two combiners, and meanwhile, the bridge cascading increases the combining insertion loss, so that the problems of reduction of the transmitting power of a communication system, shortening of the communication distance and the like are solved.
Disclosure of Invention
The utility model aims to provide a VHF frequency band two-way combiner, which reduces the use of a first-level combining bridge, effectively reduces the insertion loss of the combiner, and improves the isolation between channels by utilizing the out-of-band high-resistance characteristic of the combining filter.
In order to solve the technical problems, the technical scheme of the utility model is as follows: a VHF frequency band two-way combiner comprises a first bridge, a second bridge, a third bridge, a first combined frequency hopping filter module and a second combined frequency hopping filter module; the output ends of the first bridge and the second bridge are respectively connected with the input ends of the first combined frequency hopping filter module and the second combined frequency hopping filter module, and the output ends of the first combined frequency hopping filter module and the second combined frequency hopping filter module are respectively connected with the third bridge; after the first bridge and the second bridge receive radio frequency input from the outside, the first bridge and the second bridge respectively output radio frequency signals with preset degrees to the first combining frequency hopping filter module and the second combining frequency hopping filter module; the first combined frequency hopping filter module and the second combined frequency hopping filter module respectively combine the received radio frequency signals and output the radio frequency signals to a third bridge; the third bridge outputs two groups of radio frequency signals after combining to the outside; the first bridge, the second bridge and the third bridge are identical in model number, and the first combining frequency hopping filter module and the second combining frequency hopping filter module are identical in model number.
The first combined frequency hopping filter module and the second combined frequency hopping filter module comprise two frequency hopping filters, and the two frequency hopping filters are respectively used for receiving radio frequency inputs from the first bridge and the second bridge.
The first bridge, the second bridge and the third bridge are all high-power bridges, and the first combining frequency hopping filter module and the second combining frequency hopping filter module are all high-power combining frequency hopping filter modules.
The first bridge, the second bridge and the third bridge are all 3dB bridges.
The radio frequency signals output to the first combining frequency hopping filter module by the first bridge and the second bridge are radio frequency signals with the phase position of 0 DEG and the amplitude of-3 dB, and the radio frequency signals output to the second combining frequency hopping filter module by the first bridge and the second bridge are radio frequency signals with the phase position of 90 DEG and the amplitude of-3 dB.
The frequency hopping filter is a 30-88MHz high-power out-of-band high-resistance frequency hopping filter.
The frequency hopping filter includes a 10-way level shifter circuit and a 10-bit capacitance tuning filter.
The level shift circuit is provided with a shift register, and the model number thereof is 74HC4094D.
The capacitive tuning filter is provided with a capacitive tuning radio frequency switch which is a switching circuit built through a PIN diode.
The PIN diode is model WP0069H.
Compared with the prior art, the utility model has the beneficial effects that:
compared with the traditional two-way scheme, the utility model reduces the use of the primary way combining bridge, effectively reduces the insertion loss of the combiner, and improves the isolation between channels by utilizing the out-of-band high-resistance characteristic of the combining filter.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a combiner-hopping filter module according to an embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
The technical scheme of the utility model is as follows:
the two-way radio frequency combiner comprises three high-power 3dB bridges with the same index and 2 high-power way frequency hopping filter modules; the high-power combined frequency hopping filter bank comprises two 30-88MHz high-power out-of-band high-resistance frequency hopping filters; the radio frequency signals input/output by the two radio stations pass through the distribution bridge of the respective channels to output phase 0 0 And 90 0 The two radio frequency signals with the amplitude of-3 dB respectively divide the phase 0 of the two radio stations 0 The radio frequency signal is sent to a first group of high-power combined frequency hopping filter modules, and the phase 90 of the two radio stations 0 The radio frequency signals are sent to a second group of high-power combining frequency hopping filter modules to be combined respectively, and the two groups of signals after the combination are combined to a radio frequency channel through a high-power 3dB bridge and output to an antenna radio frequency interface.
The 3dB bridge module includes lumped parameter inductive, capacitive couplers.
Compared with the traditional two-way scheme, the utility model reduces the use of the primary way combining bridge, effectively reduces the insertion loss of the combiner, and improves the isolation between channels by utilizing the out-of-band high-resistance characteristic of the combining filter.
The utility model is characterized in that the out-of-band high-resistance high-power frequency hopping filter of 30-88MHz is realized, the coupling inductance of the radio frequency input/output port of the filter and the access coefficient of the filter are adjusted by optimally designing the traditional 30-88MHz high-power frequency hopping filter, the impedance out of the resonance frequency band of the radio frequency input port is changed, the out-of-band high-impedance characteristic of the frequency hopping filter is realized, and the two 30-88MHz frequency hopping band pass filters can meet the requirement of 10% direct combination deviating from the resonance center frequency.
The out-of-band high-resistance high-power frequency hopping filter with 30-88MHz changes the impedance out of the resonance frequency band of the radio frequency input port by optimally designing the coupling inductance of the radio frequency input port and the access coefficient of the filter, realizes the characteristic of the out-of-band high impedance of the filter, and ensures that two frequency hopping band pass filters with 30-88MHz can meet the requirement of 10% direct combination away from the resonance center frequency. The frequency hopping filter includes a 10-way level shifter circuit and a 10-bit capacitance tuning filter. The level shift circuit is provided with a shift register, and the model number thereof is 74HC4094D. The capacitive tuning filter is provided with a capacitive tuning radio frequency switch which is a switching circuit built through a PIN diode. The PIN diode is model WP0069H.
In the utility model, the two combined frequency hopping filters output 0 to the distribution bridge respectively 0 、90 0 The radio frequency of the phase is combined for the first time, and then is combined with 0 through a combining bridge 0 、90 0 The phase combining radio frequency signals are subjected to secondary combining and finally output to a radio frequency channel; the novel two-way combination mode optimizes the original bridge-stage combination mode, cancels the main and auxiliary way design of the combination channel, ensures that two radio frequency channels are completely symmetrical, reduces one combination bridge compared with the traditional two-way combination scheme, and improves the insertion loss of the combination module by more than 0.5dB.
In the utility model, after the scheme of secondary combination is adopted, the isolation between two radio frequency channels is greatly improved, the first-stage radio frequency signal is output through the distribution bridge, wherein the phase 0 of the first channel 0 Phase 0 of a distribution bridge with RF signal coupled to a second channel through a combiner filter 0 Output, phase 90 of the first channel 0 Phase 90 of a distribution bridge with a radio frequency signal coupled to a second channel through a combiner filter 0 An output, which is combined at the distribution bridge of the second channel and output to the ISO terminal (isolated port) of the bridge,the radio frequency signals of the second channel are coupled and output to an ISO port (isolation port) of the first channel distribution bridge, and the isolation ports of the two bridges are connected with a high-power matching load of 50 ohms, so that the interference radio frequency signals of adjacent radio frequency coupling are absorbed; the isolation of the first-stage combining filter to the combined signal which deviates from the resonance center frequency by 10% is greater than 24dB from the whole radio frequency link, and the combined signal is output to an ISO port through a second-stage distribution bridge, the isolation between the bridge radio frequency input end and the ISO port is greater than 25dB, and the isolation of the whole combining module is greater than 49dB, so that the isolation between two radio frequency channels is improved by about 14dB compared with the traditional two-combining scheme.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. The VHF frequency band two-way combiner is characterized by comprising a first bridge, a second bridge, a third bridge, a first combined frequency hopping filter module and a second combined frequency hopping filter module; the output ends of the first bridge and the second bridge are respectively connected with the input ends of the first combined frequency hopping filter module and the second combined frequency hopping filter module, and the output ends of the first combined frequency hopping filter module and the second combined frequency hopping filter module are respectively connected with the third bridge; after the first bridge and the second bridge receive radio frequency input signals from the outside, the first bridge and the second bridge respectively output radio frequency signals with preset degrees to the first combining frequency hopping filter module and the second combining frequency hopping filter module; the first combined frequency hopping filter module and the second combined frequency hopping filter module respectively combine the received radio frequency signals and output the radio frequency signals to a third bridge; the third bridge outputs two groups of radio frequency signals after combining to the outside; the first bridge, the second bridge and the third bridge are identical in model number, and the first combining frequency hopping filter module and the second combining frequency hopping filter module are identical in model number.
2. The VHF band two-combiner of claim 1 wherein the first and second combined frequency hopping filter modules each comprise two frequency hopping filters for receiving radio frequency inputs from the first and second bridges, respectively.
3. The VHF band two-combiner of claim 2 wherein the first bridge, the second bridge and the third bridge are high power bridges, and the first and second combined frequency hopping filter modules are high power combined frequency hopping filter modules.
4. A VHF band two-combiner according to claim 3, wherein the first bridge, the second bridge and the third bridge are all 3dB bridges.
5. The VHF band two-combiner of claim 4 wherein the radio frequency signals output by the first and second bridges to the first combining frequency hopping filter module are radio frequency signals having a phase 0 ° and an amplitude-3 dB and the radio frequency signals output by the first and second bridges to the second combining frequency hopping filter module are radio frequency signals having a phase 90 ° and an amplitude-3 dB.
6. A VHF band two-combiner according to claim 3, wherein the frequency hopping filter is a 30-88MHz high power out-of-band high impedance frequency hopping filter.
7. The VHF band two-combiner of claim 6 wherein the frequency hopping filter comprises a 10-way level shifter circuit and a 10-bit capacitance tuning filter.
8. The VHF band two-combiner according to claim 7, wherein the level shifter circuit is provided with a shift register of a type 74HC4094D.
9. The VHF band two-combiner according to claim 6, wherein a capacitance tuning radio frequency switch is provided in the capacitance tuning filter, the capacitance tuning radio frequency switch being a switching circuit built by a PIN diode.
10. A VHF band two-combiner according to claim 9, wherein the PIN diode is of the type WP0069H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320880055.0U CN220122896U (en) | 2023-04-18 | 2023-04-18 | VHF frequency band two-combiner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320880055.0U CN220122896U (en) | 2023-04-18 | 2023-04-18 | VHF frequency band two-combiner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220122896U true CN220122896U (en) | 2023-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320880055.0U Active CN220122896U (en) | 2023-04-18 | 2023-04-18 | VHF frequency band two-combiner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220122896U (en) |
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2023
- 2023-04-18 CN CN202320880055.0U patent/CN220122896U/en active Active
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