Silicon-based capacitor microstrip low-pass filter, microwave test equipment and electronic countermeasure equipment
By combining silicon-based capacitor microstrip lines in low-pass filters and using high-Q, low-loss silicon-based capacitor chips, the problem of balancing the volume and performance of filters in high-frequency and high-power applications is solved, achieving miniaturization and performance improvement of the filters.
Patent Information
- Application Number
- CN202422834832.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-20
AI Technical Summary
Existing low-pass filters cannot balance size and performance in high-frequency and high-power applications. LC filters have low power capacity, cavity filters are large and expensive, and microstrip line filters have large board area and high cost.
A silicon-based capacitor microstrip low-pass filter is used, combining a silicon-based capacitor chip with a microstrip line. A high-Q, low-loss, low-temperature drift silicon-based capacitor chip is used to replace the longer microstrip line. The filter is constructed by combining capacitors and microstrip lines, and the silicon-based capacitor value is adjusted to achieve a good frequency response curve.
While reducing the filter volume, the performance of the filter is improved, maintaining good frequency response and low loss, making it suitable for high-frequency and high-power applications.
Smart Images
Figure CN223451171U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to microwave filter design technical field especially, it relates to a silicon base capacitor microstrip low pass filter, microwave test equipment and electronic countermeasure equipment. BACKGROUND
[0002] Low pass filter is important component in communication system, is widely used in multiband, wideband and frequency hopping communication and radar system, is important component of communication system radio frequency front end, according to implementation, the existing low pass filter is mainly divided into LC low pass filter, microstrip line low pass filter, cavity low pass filter three types.
[0003] LC low pass filter's power capacity is lower, and the area is smaller, but due to LC structure in high frequency Q value deteriorates fast, and the insertion loss is also larger, and the structure characteristics of LC device need to avoid higher magnetic ring height and interplate height, not suitable for being used in high frequency high power radio frequency power front end and low noise receiving front end application, generally applicable to low frequency receiving link or small signal transmitting link.
[0004] Microstrip line low pass filter's power capacity is higher, but the board area is large, and in the early design, need more manufacturing cost to select the good frequency response curve of the plate sample, not suitable for being used in small volume high power radio frequency power front end.
[0005] Cavity low pass filter has high power capacity and high Q value, but its volume is large, and the structure cost is high, generally applicable to medium and large high frequency receiving link or large power transmitting link.
[0006] Therefore, it is necessary to provide a technical scheme for greatly reducing the size of the filter without affecting the performance of the filter. UTILITY MODEL CONTENTS
[0007] The utility model provides a silicon base capacitor microstrip low pass filter, microwave test equipment and electronic countermeasure equipment can greatly reduce the size of the filter without affecting the performance of the filter.
[0008] The utility model provides a silicon base capacitor microstrip low pass filter, including dielectric plate, the upper surface of dielectric plate is equipped with microstrip line, the microstrip line is equipped with multistage microstrip branch, each stage microstrip branch is connected with one end of silicon base capacitor chip, and the other end of silicon base capacitor chip is grounded.
[0009] As an embodiment, the working frequency of the filter is determined based on the capacitance value of each silicon base capacitor chip and the length of the microstrip branch.
[0010] As an embodiment, the working frequency of the filter is in L wave band.
[0011] As an embodiment, the microstrip line comprises a first microstrip line unit, a second microstrip line unit and a third microstrip line unit, the first microstrip line unit, the second microstrip line unit and the third microstrip line unit are connected in sequence, and a plurality of microstrip branches are arranged on two sides of the second microstrip line unit.
[0012] As an embodiment, the number of the microstrip branches is even.
[0013] As an embodiment, the number of the microstrip branches is six.
[0014] As an embodiment, the microstrip branches are arranged staggeredly.
[0015] As an embodiment, one end of the first microstrip line unit is communicated with the second microstrip line unit, the other end is provided with a first filter input / output port, one end of the third microstrip line unit is communicated with the second microstrip line unit, the other end is provided with a second filter input / output port, and the first filter input / output port and the second filter input / output port are arranged at two opposite corners of the dielectric plate.
[0016] The utility model also provides a kind of microwave test equipment, including any one described silicon-based capacitor microstrip low pass filter.
[0017] The utility model also provides a kind of electronic countermeasure equipment, including any one described silicon-based capacitor microstrip low pass filter.
[0018] The silicon-based capacitor microstrip low pass filter, microwave test equipment and electronic countermeasure equipment provided by the utility model include a dielectric plate, the upper surface of the dielectric plate is provided with a microstrip line, the microstrip line is provided with a plurality of microstrip branches, one end of each microstrip branch is connected with a silicon-based capacitor chip, and the other end of the silicon-based capacitor chip is grounded. The utility model constructs filter by the combination of microstrip branch and silicon-based capacitor chip, and the silicon-based capacitor chip has the characteristics of high Q value, low loss, high power capacity and low temperature drift, which can reduce the size of the filter while improving the performance of the filter. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical scheme of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings described below are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.
[0020] Figure 1 is one of the structure schematic diagram of the silicon-based capacitor microstrip low pass filter provided by the utility model.
[0021] Figure 2 is a structure schematic view of the silicon-based capacitor microstrip low-pass filter provided by the utility model.
[0022] Figure 3 is a simulation circuit schematic view of the silicon-based capacitor microstrip low-pass filter provided by the utility model.
[0023] Figure 4 is a simulation frequency response curve graph of the silicon-based capacitor microstrip low-pass filter provided by the utility model.
[0024] In the figure, 1-microstrip line, 2-silicon-based capacitor chip, 3-first filter input and output port, 4-second filter input and output port. DETAILED DESCRIPTION
[0025] In order that the utility model's purpose, technical scheme and advantage are more clear, the following will combine the drawings in the utility model, carry out clear, complete description to the technical scheme in the utility model, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor are within the scope of the utility model protection.
[0026] The LC low-pass filter has limited power capacity, and since the LC structure deteriorates quickly at high frequency Q value, the insertion loss is large, which will cause excessive self-heating at the transmitting end and deteriorate the link noise at the receiving end; in addition, the LC structure has large temperature drift, which causes large deterioration of the filter performance at high and low temperature.
[0027] The microstrip line low-pass filter uses the microstrip line coupling mode, resulting in large board area.
[0028] The cavity low-pass filter has the advantages of high power capacity and high Q value, but has large volume, high requirement for structure precision, and high structure cost.
[0029] In summary, the existing low-pass filter cannot balance the volume and performance of the filter, therefore, the utility model provides a silicon-based capacitor microstrip low-pass filter, microwave test equipment and electronic countermeasure equipment, which uses the silicon-based capacitor chip with high Q value, low loss and low temperature drift in combination with the microstrip line, replaces the long microstrip line, and uses the capacitor and microstrip line combination mode, so as to greatly reduce the board area. By reasonably adjusting the silicon-based capacitor value, the filter can realize good frequency response curve, so that the filter can reduce the volume and improve the filter performance.
[0030] The utility model will be described in detail below. Figures 1-4 The utility model will be described in detail below.
[0031] Figure 1 is one of the structure schematic diagram of the silicon-based capacitor microstrip low-pass filter provided by the utility model, Figure 2 is the structure schematic diagram two of the silicon-based capacitor microstrip low-pass filter provided by the utility model, as shown in Figure 1 and Figure 2 The utility model provides a kind of silicon-based capacitor microstrip low-pass filter, including dielectric plate, the upper surface of dielectric plate is equipped with microstrip line 1, the microstrip line 1 is equipped with multiple order microstrip branch, each order microstrip branch is connected with one end of silicon-based capacitor chip 2, the other end of silicon-based capacitor chip 2 is grounded.
[0032] Dielectric plate is also called dielectric substrate, and it will affect the performance, size, bandwidth and resonance characteristics of the filter. It can be made of FR-4, PTFE (polytetrafluoroethylene, such as Rogers series), ceramic, polyimide, etc. The dielectric plate in the embodiment of the utility model adopts a cuboid shape.
[0033] The microstrip line 1 is S-shaped as a whole. The combination of the microstrip line 1 and the silicon-based capacitor chip 2 connected by each order microstrip branch realizes the function of the filter. The silicon-based capacitor chip 2 has the characteristics of high Q value, low loss and low temperature drift, which can effectively reduce the size of the filter and save costs. At the same time, it maintains good Chebyshev waveform within the frequency hopping range of the filter, and the standing wave and in-band insertion loss are not significantly deteriorated.
[0034] In the embodiment of the utility model, the microstrip line 1 can be fixed to the dielectric plate by pasting or hot pressing, etc. to ensure the stability of the filter during use.
[0035] It can be understood that the utility model constructs the filter by the combination of microstrip branch and silicon-based capacitor chip 2. The silicon-based capacitor chip 2 has the characteristics of high Q value, low loss, high power capacity and low temperature drift, which can improve the performance of the filter while reducing the size of the filter.
[0036] Based on the above embodiment, as an optional embodiment, the working frequency of the filter is determined based on the capacitance value of each silicon-based capacitor chip 2 and the length of the microstrip branch.
[0037] Optionally, the working frequency of the filter is in the L band, and the frequency range of the L band is 1GHz to 2GHz.
[0038] Optionally, the microstrip line 1 includes a first microstrip line unit, a second microstrip line unit and a third microstrip line unit, the first microstrip line unit, the second microstrip line unit and the third microstrip line unit are connected in sequence, and the multiple order microstrip branches are arranged on both sides of the second microstrip line unit.
[0039] Optionally, the number of the microstrip branches is even.
[0040] Optionally, the positions of the microstrip branches are staggered, and each microstrip branch is not located at the same transverse position of the second microstrip unit.
[0041] Optionally, one end of the first microstrip unit is in communication with the second microstrip unit, and the other end is provided with a first filter input / output port 3; one end of the third microstrip unit is in communication with the second microstrip unit, and the other end is provided with a second filter input / output port 4; and the first filter input / output port 3 and the second filter input / output port 4 are arranged at two opposite corners of the dielectric plate.
[0042] Figure 3 is a simulation circuit schematic diagram of the silicon-based capacitor microstrip low-pass filter provided by the utility model, Figure 4 is a simulation frequency response curve diagram of the silicon-based capacitor microstrip low-pass filter provided by the utility model, as Figure 3 and Figure 4 shown, Figure 4 m1 in is the maximum insertion loss in the band, the frequency value is 2.000GHz, the loss value is dB (S (1, 2)) =-0.472, m2 is the worst return loss in the band, the frequency value is 1.862GHz, the loss value is dB (S (1, 1)) =-23.108, and m3 is the worst return loss out of the band, the frequency value is 2.600GHz, and the loss value is dB (S (1, 2)) =-110.919.
[0043] It can be understood that the filter body provided by the utility model is designed by using a microstrip line coupling mode, each stage branch is connected with a silicon-based capacitor chip, so that the length of each stage microstrip line is reduced, the working frequency of the filter is confirmed by the silicon-based capacitor capacitance value and the microstrip combination.
[0044] The microwave test equipment and the electronic countermeasure equipment provided by the utility model are described below, and the microwave test equipment and the electronic countermeasure equipment described below can be correspondingly referred to the silicon-based capacitor microstrip low-pass filter described above.
[0045] The utility model also provides a kind of microwave test equipment, including the silicon-based capacitor microstrip low pass filter of any item described.The microwave test equipment is widely used in signal generation, transmission, analysis and measurement of radio frequency (RF) and microwave frequency band (usually 1GHz to 300GHz), and has important application in communication, radar, satellite, medical treatment and material analysis etc.
[0046] The utility model also provides a kind of electronic countermeasure equipment, including the silicon-based capacitor microstrip low pass filter of any item described.Electronic countermeasure equipment (Electronic Countermeasure, ECM) is used to interfere, deceive and destroy enemy's electronic system, especially in military and security field, aims at protecting friendly communication, radar and other electronic equipment from enemy's interference and attack.
[0047] It can be understood that the microwave test equipment and electronic countermeasure equipment provided by the utility model have the technical effects corresponding to any silicon-based capacitor microstrip low pass filter described above, which will not be repeated.
[0048] The device embodiments described above are only schematic, wherein the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units.
[0049] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software and necessary general hardware platform, and of course, can also be realized by hardware.Based on such understanding, the above technical solutions can be embodied in the form of software product, which can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including a plurality of instructions to make a computer device (which can be a personal computer, satellite navigation system, or network device, etc.) execute the method described in each embodiment or some parts of the embodiment.
[0050] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.
Claims
1. A silicon-based capacitor microstrip low-pass filter, comprising a dielectric plate, characterized in that: A microstrip line is provided on the upper surface of the dielectric plate. The microstrip line is provided with multi-stage microstrip branches. Each stage of the microstrip branches is connected to one end of a silicon-based capacitor chip, and the other end of the silicon-based capacitor chip is grounded.
2. The silicon-based capacitor microstrip low-pass filter according to claim 1, characterized in that: The operating frequency of the filter is determined based on the capacitance value of each of the silicon-based capacitor chips and the length of the microstrip branch.
3. The silicon-based capacitor microstrip low-pass filter according to claim 2, characterized in that: The operating frequency of the filter is in the L band.
4. The silicon-based capacitor microstrip low-pass filter according to any one of claims 1 to 3, characterized in that: The microstrip line includes a first microstrip line unit, a second microstrip line unit and a third microstrip line unit. The first microstrip line unit, the second microstrip line unit and the third microstrip line unit are connected in sequence, and multi-order microstrip branches are arranged on both sides of the second microstrip line unit.
5. The silicon-based capacitor microstrip low-pass filter according to claim 4, characterized in that: The number of the microstrip branches is an even number.
6. The silicon-based capacitor microstrip low-pass filter according to claim 5, characterized in that: The number of the microstrip branches is six.
7. The silicon-based capacitor microstrip low-pass filter according to claim 4, characterized in that: The microstrip branches are arranged in a staggered manner.
8. The silicon-based capacitor microstrip low-pass filter according to claim 4, characterized in that: One end of the first microstrip line unit is connected to the second microstrip line unit, and the other end is provided with a first filter input and output port. One end of the third microstrip line unit is connected to the second microstrip line unit, and the other end is provided with a second filter input and output port. The first filter input and output port and the second filter input and output port are arranged at two diagonal corners of the dielectric plate.
9. A microwave testing device, characterized in that: A silicon-based capacitor microstrip low-pass filter comprising the silicon-based capacitor microstrip low-pass filter according to any one of claims 1 to 8.
10. An electronic countermeasure device, characterized in that: A silicon-based capacitor microstrip low-pass filter comprising the silicon-based capacitor microstrip low-pass filter according to any one of claims 1 to 8.