CN219760987U - Switch filter bank of integrated interdigital strip line band pass filter - Google Patents
Switch filter bank of integrated interdigital strip line band pass filter Download PDFInfo
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- CN219760987U CN219760987U CN202321311071.4U CN202321311071U CN219760987U CN 219760987 U CN219760987 U CN 219760987U CN 202321311071 U CN202321311071 U CN 202321311071U CN 219760987 U CN219760987 U CN 219760987U
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- 239000010410 layer Substances 0.000 claims description 57
- 230000007704 transition Effects 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000011229 interlayer Substances 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 abstract description 14
- 230000001629 suppression Effects 0.000 abstract description 6
- 238000004891 communication Methods 0.000 abstract description 4
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- 230000010354 integration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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Abstract
The utility model discloses a switch filter bank of an integrated interdigital type stripline bandpass filter, which belongs to the technical field of microwave communication and comprises a power supply voltage stabilizing circuit, a switch control circuit, two stripline bandpass filters and two switch devices, wherein the power supply voltage stabilizing circuit is used for supplying power to a circuit, the switch control circuit is used for driving the switch devices, the two stripline bandpass filters are connected in parallel between the two switch devices, the stripline bandpass filters are used for realizing the filtering of signals in different frequency bands, and the switch devices are used for completing the gating of the signals in different frequency bands. Compared with the prior art, the switch filter bank adopts the technical scheme of combining the switch device and the interdigital stripline band-pass filter, so that the technical indexes of channel isolation, out-of-band suppression and the like of the switch filter bank can be effectively improved, and the circuit size can be reduced.
Description
Technical Field
The utility model belongs to the technical field of microwave communication, and particularly relates to a switch filter bank of an integrated interdigital strip line band-pass filter.
Background
The rapid development of space technology requires that the microwave transmission system has good performances such as small size and light weight, and the multilayer printed boards are widely applied along with the higher and higher integration degree of circuit functions. The switch filter bank is used as a key component of a frequency-selecting network and is widely applied to the field of microwave communication.
The current common switch filter group combines a switch device with a multi-stage microstrip or cavity filter, has large volume and higher requirements on isolation design, and the microwave filter plays roles of passing useful signals and filtering clutter in a microwave integrated circuit. With the rapid development of wireless communication technology, higher and higher requirements are placed on the out-of-band rejection level of filters. The conventional interdigital microstrip band-pass filter has wide application, but has low-end out-of-band rejection difference due to the fact that the low-end of the passband of the frequency response has no transmission zero. And for circuit boards with high demands for miniaturization and integration, microstrip circuits have limitations in size optimization. At present, how to effectively improve the technical indexes such as channel isolation, out-of-band suppression and the like of a switch filter bank and reduce the circuit size becomes a technical problem in the field.
Disclosure of Invention
Aiming at the technical problems, the utility model provides a switch filter bank of an integrated interdigital stripline bandpass filter, which adopts the technical scheme of combining a switch device and the interdigital stripline bandpass filter, so that the technical indexes such as channel isolation, out-of-band suppression and the like of the switch filter bank can be effectively improved, and the circuit size can be reduced.
The utility model solves the problems by the following technical means:
a switched filter bank of integrated interdigital stripline bandpass filters, comprising a power supply voltage stabilizing circuit, a switch control circuit, two stripline bandpass filters and two switching devices, wherein:
the power supply voltage stabilizing circuit is used for supplying power to the circuit;
the switch control circuit is used for driving the switching device;
the two stripline band-pass filters are connected in parallel between the two switching devices, and the stripline band-pass filters are used for filtering signals in different frequency bands;
the switching device is used for completing gating of signals in different frequency bands.
Preferably, the switch filter group adopts a four-layer PCB structure, and the four-layer PCB structure sequentially comprises a device layer, a GND layer, a filter layer and a GND layer from top to bottom, wherein:
the device layer is provided with a power supply voltage stabilizing circuit, a switch control circuit and two switch devices, and the power supply voltage stabilizing circuit and the switch control circuit are arranged between the two switch devices;
a strip line band-pass filter is arranged on the filtering layer;
an interlayer transition structure is arranged between the device layer and the filter layer, and is used for realizing cross-layer transmission of microwave signals between the multi-layer dielectric plates and connecting a switching device and a strip line band-pass filter from the physical structure;
the GND layer is used for shielding signal radiation and interference.
Preferably, the layer transition structure is a microstrip-stripline vertical transition structure.
Preferably, the power supply voltage stabilizing circuit comprises an LT1931 chip circuit, and the switch control circuit comprises an SN74HC04PW chip circuit.
Preferably, the switching device comprises an HMC347ALP3E chip circuit.
The switch filter group of the integrated interdigital stripline band-pass filter has the following
The beneficial effects are that:
(1) The switch filter bank adopts the technical scheme of combining the switch device and the interdigital stripline band-pass filter, not only can effectively improve the technical indexes such as channel isolation, out-of-band suppression and the like of the switch filter bank, but also can reduce the circuit size, and compared with the interdigital bandpass filter with a microstrip structure, the suppression degree of the same out-of-band frequency point can be improved by at least 20dB.
(2) A complete GND layer is arranged between a device and a strip line filter in the switch filter, so that the transmission and isolation performance of signals are not affected. Because the filter is positioned in the middle layer of the PCB, and the upper part and the lower part of the filter are wrapped by complete grounding layers, the filter can achieve good isolation effect only by proper GND holes when in circuit layout, and the filter is not required to pay special attention to space isolation and metal shielding like a microstrip line structure.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the principles of operation of the present utility model;
FIG. 2 is a schematic diagram of the circuit connections of the stripline bandpass filter and switching device of the utility model;
FIG. 3 is a schematic diagram of an interdigitated stripline bandpass filter configuration of the utility model;
FIG. 4 is a schematic diagram of a power supply voltage regulator circuit of the present utility model;
fig. 5 is a circuit schematic of the switch control circuit of the present utility model.
Detailed Description
In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
The present utility model will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 5, the switching filter bank of the integrated interdigital stripline bandpass filter includes a power supply voltage stabilizing circuit, a switch control circuit, two stripline bandpass filters, and two switching devices, wherein: the power supply voltage stabilizing circuit is used for supplying power to the circuit; the switch control circuit is used for driving the switching device; the two stripline band-pass filters are connected in parallel between the two switching devices, and the stripline band-pass filters are used for filtering signals in different frequency bands; the switching device is used for completing gating of signals in different frequency bands.
It should be noted that, because of its unique structural form, the stripline can better prevent radio frequency radiation, compared with microstrip filter of the same form, such as interdigital filter, the filter based on stripline form can realize more outstanding out-of-band rejection characteristic, through a large amount of experiments and data analysis, the out-of-band rejection degree of stripline structure is obviously higher than microstrip structure compared with interdigital microstrip bandpass filter of the same frequency band and interdigital stripline bandpass filter, and the stripline is convenient to integrate between multilayer printed boards, can reduce the size, improve the space utilization of PCB board, be convenient for PCB overall arrangement again, reduce the crosstalk between the signals.
In actual operation, the scheme mainly realizes the gating and filtering of 7000-7300MHz and 8000-8800MHz signals. The switching device can be selected from common models such as HMC347ALP3E or CMD196C3 of Qorvo company, the isolation of an output port is more than 45dBc, the switching time is quick, and the two band-pass filters adopt a strip line structure.
In this embodiment, the switch filter bank adopts four-layer PCB structure, and four-layer PCB structure divides from the function, and top-down comprises device layer, GND layer, filtering layer and GND layer in proper order, wherein: the device layer is provided with a power supply voltage stabilizing circuit, a switch control circuit and two switch devices, and the power supply voltage stabilizing circuit and the switch control circuit are arranged between the two switch devices; a strip line band-pass filter is arranged on the filtering layer; an interlayer transition structure is arranged between the device layer and the filter layer, and is used for realizing cross-layer transmission of microwave signals between the multi-layer dielectric plates and connecting a switching device and a strip line band-pass filter from the physical structure; the GND layer is used for shielding signal radiation and interference.
In actual operation, after the input signal passes through the switch, the input signal is firstly transmitted to the strip line band-pass filter of the third layer from the first layer, namely the device layer, of the PCB through a transition structure of the first layer to the third layer, and after the input signal is filtered, the input signal is transmitted to the device layer of the first layer through the same transition structure, and then is output after passing through the final switch. The PCB adopts four layers of boards, so that some power supply and control circuit devices are arranged between the two-stage switches on the top layer due to higher size requirements, the circuit size is greatly saved, and a complete GND layer is arranged between the devices and the strip line filter, so that the signal transmission and isolation performance cannot be affected. In addition, because the filter is positioned in the middle layer of the PCB and is wrapped by the complete grounding layers, good isolation effect can be achieved only by proper GND holes in circuit layout, and the space isolation and metal shielding are not needed to be particularly paid attention like a microstrip line structure.
Specifically, the interlayer transition structure is a microstrip line-strip line vertical transition structure, the power supply voltage stabilizing circuit comprises an LT1931 chip circuit, the switch control circuit comprises an SN74HC04PW chip circuit or a TC74VHC14FK type, and the switch device comprises an HMC347ALP3E chip circuit or a CMD196C3 type.
It should be noted that, the switch filter bank of the integrated interdigital stripline bandpass filter can significantly improve the out-of-band rejection level because of the interdigital bandpass filter adopting the stripline structure. Compared with an interdigital band-pass filter with a microstrip structure, the suppression degree of the same frequency point outside the band can be improved by at least 20dB. Due to the adoption of the band-pass filter with the strip line structure, the space utilization rate of the multi-layer PCB is improved, the structural size is not occupied, and the band-pass filter is more convenient to apply to the miniaturization requirement. In addition, the strip line filter is positioned in the middle layer of the PCB and is completely wrapped up and down, so that a good isolation effect can be achieved only by proper GND holes in circuit layout, and the space isolation and metal shielding are not needed to be particularly paid attention like a microstrip line structure.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (5)
1. A switched filter bank of integrated interdigital stripline bandpass filters comprising a power supply voltage stabilizing circuit, a switch control circuit, two stripline bandpass filters and two switching devices, wherein:
the power supply voltage stabilizing circuit is used for supplying power to the circuit;
the switch control circuit is used for driving the switching device;
the two stripline band-pass filters are connected in parallel between the two switching devices, and the stripline band-pass filters are used for filtering signals in different frequency bands;
the switching device is used for completing gating of signals in different frequency bands.
2. The switch filter bank of integrated interdigital stripline bandpass filter of claim 1, wherein the switch filter bank employs a four-layer PCB structure consisting of a device layer, a GND layer, a filter layer and a GND layer in this order from top to bottom, wherein:
the device layer is provided with a power supply voltage stabilizing circuit, a switch control circuit and two switch devices, and the power supply voltage stabilizing circuit and the switch control circuit are arranged between the two switch devices;
a strip line band-pass filter is arranged on the filtering layer;
an interlayer transition structure is arranged between the device layer and the filter layer, and is used for realizing cross-layer transmission of microwave signals between the multi-layer dielectric plates and connecting a switching device and a strip line band-pass filter from the physical structure;
the GND layer is used for shielding signal radiation and interference.
3. The switched filter bank of integrated interdigital stripline bandpass filters of claim 2, wherein the layer transition structure is a microstrip-stripline vertical transition structure.
4. The integrated interdigitated stripline bandpass filter switching filter bank of claim 3, wherein said power supply voltage stabilizing circuit comprises an LT1931 chip circuit and said switching control circuit comprises an SN74HC04PW chip circuit.
5. The bank of integrated interdigitated stripline bandpass filters according to claim 4, wherein the switching device comprises HMC347ALP3E chip circuitry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321311071.4U CN219760987U (en) | 2023-05-28 | 2023-05-28 | Switch filter bank of integrated interdigital strip line band pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321311071.4U CN219760987U (en) | 2023-05-28 | 2023-05-28 | Switch filter bank of integrated interdigital strip line band pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219760987U true CN219760987U (en) | 2023-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321311071.4U Active CN219760987U (en) | 2023-05-28 | 2023-05-28 | Switch filter bank of integrated interdigital strip line band pass filter |
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| Country | Link |
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| CN (1) | CN219760987U (en) |
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2023
- 2023-05-28 CN CN202321311071.4U patent/CN219760987U/en active Active
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