CN211980436U - Cavity capacitor and high-pass filter formed by same - Google Patents
Cavity capacitor and high-pass filter formed by same Download PDFInfo
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- CN211980436U CN211980436U CN202022347338.8U CN202022347338U CN211980436U CN 211980436 U CN211980436 U CN 211980436U CN 202022347338 U CN202022347338 U CN 202022347338U CN 211980436 U CN211980436 U CN 211980436U
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Abstract
The utility model discloses a cavity capacitor and a high-pass filter composed of the same, wherein the cavity capacitor comprises a cavity, an inner conductor is arranged in the cavity in a penetrating way, the output end and the input end of the cavity capacitor are respectively provided with an insulator connected with the inner conductor, and the inner conductor and the insulator are sintered on the cavity through a limiting piece; the inner conductor comprises two coaxial conductors connected through a threaded column, a circular gasket is arranged between the two coaxial conductors, and the threaded column penetrates through the center of the circular gasket; the high-pass filter comprises a cavity capacitor and an LC filter circuit, and an insulator at the output end of the cavity capacitor is connected with the LC filter circuit. The internal fastening mode of the capacitor can achieve miniaturization, and the capacitor has the advantage of bearing high power, and the bypass is added with the LC filter circuit to form the high-pass filter, so that the performance of the ultra-wideband high-pass filter can be improved.
Description
Technical Field
The utility model relates to a wave filter field especially relates to a cavity condenser and high pass filter who constitutes thereof.
Background
The existing low-frequency band high-pass filter mainly uses an LC filter built by a capacitor inductor, has the advantage of miniaturization, but is difficult to realize ultra wide band and high power due to the influence of the self-resonant frequency of the capacitor inductor. The cavity type coaxial high-pass filter can meet the requirement of high power, but the ultra-wideband and miniaturization are difficult to realize at the initial frequency of 400 MHz.
Due to the influence of parasitic parameters, the microstrip type high-pass filter is difficult to realize ultra-wideband, miniaturization and high power at the initial frequency of 400 MHz. The existing low-frequency band high-pass filter has the technical problems of large volume, narrow bandwidth, low power capacity, difficult debugging and the like.
SUMMERY OF THE UTILITY MODEL
The utility model mainly provides a cavity condenser and high pass filter who constitutes thereof can solve current high pass filter and difficultly realize ultra wide band, miniaturization and high-power scheduling problem.
In order to solve the technical problem, the utility model discloses a technical scheme be: a cavity capacitor and a high-pass filter formed by the same are provided.
The cavity capacitor comprises a cavity 1, an inner conductor 2 penetrates through the cavity 1, an insulator 3 connected with the inner conductor 2 is arranged at the output end and the input end of the cavity capacitor respectively, the insulator 3 is connected with the inner conductor 2 through a coaxial line, and the inner conductor 2 and the insulator 3 are sintered on the cavity 1 through a limiting piece 4;
the inner conductor 2 comprises two coaxial conductors 21 connected through a threaded post 23, a circular gasket 22 is arranged between the two coaxial conductors 21, and the threaded post 23 penetrates through the center of the circular gasket 22.
Preferably, the cavity capacitor further comprises a cover plate 5 covering the cavity 1.
Preferably, the resistance value of the coaxial line is 50 Ω, and the threaded column 23 is a teflon threaded column.
Preferably, the size of the circular gasket 22 is RO6010, and the thickness of the circular gasket 22 is 0.254 mm.
The high-pass filter comprises an LC filter circuit, and an insulator 3 at the output end of the cavity capacitor is connected with the LC filter circuit.
Preferably, in the high-pass filter, the input end of the cavity capacitor is connected with a first matching resistor R1 through an insulator 3, and the common connection point of the cavity capacitor and the LC filter circuit is connected with a second matching resistor R2.
Preferably, the capacitance value of the cavity capacitor is 17 pF.
Preferably, the LC filter circuit includes a laminated inductor L and a chip capacitor C2, one end of the laminated inductor L is connected to the output terminal of the cavity capacitor, the other end of the laminated inductor L is connected to one end of the chip capacitor C2, and the other end of the chip capacitor C2 is grounded.
Preferably, in the high-pass filter, a chip resistor R3 is connected in parallel to two ends of the chip capacitor C2, and the resistance of the chip resistor R3 is 50 Ω.
Preferably, in the high-pass filter, the inductance value of the laminated inductor L is 39nH, and the capacitance value of the chip capacitor C2 is 200 pF.
The utility model has the advantages that: (1) different from the prior art, the inner conductor 2 and the insulator 3 of the capacitor with the cavity are sintered on the cavity 1 through the limiting pieces 4, and the insulator and the inner conductor are integrally sintered on the cavity through the two limiting pieces; due to the use of the limiting sheet, the assembly is convenient, the high assembly consistency is ensured, and the miniaturization of the device is realized; the insulator is used at the input/output port, so that the connection with other devices is facilitated; (2) the inner conductor 2 comprises coaxial conductors 21 connected through a threaded column 23, a circular gasket 22 is arranged between the coaxial conductors 21, the threaded column is used for penetrating and connecting the circular gasket, and then the two coaxial conductors 21 are screwed to fasten a structural member, so that a disc capacitor is formed while the two coaxial conductors 21 are prevented from being short-circuited; (3) an LC filter circuit is added in a bypass of the cavity capacitor to form a high-pass filter, the cavity capacitor and the LC filter circuit are separately designed and assembled, the design difficulty is reduced, the debugging workload is reduced, the product volume is greatly reduced, and meanwhile, the cavity capacitor and the LC are combined to perform simulation, and the size and the installation position of an inductance value and a capacitance value are adjusted to realize the ultra-wideband high-pass filtering of 0.4GHz-6 GHz; (4) the out-of-band rejection can be improved by adding the LC filter circuit into the bypass, and the 120W continuous wave signal of the main circuit does not pass through the inductor and the capacitor of the bypass, so that the inductor and the capacitor can be in a small packaging form; the power is not only guaranteed not to be burnt out due to the small packaged inductance and capacitance, but also the frequency point inhibition of 10 MHz-50 MHz is guaranteed to be larger than 12 dB. The LC high-power filter on the market transmits energy through a large packaging capacitor and a winding inductor, so that the service life of the capacitor inductor is greatly shortened, and if the external heat dissipation is not optimally designed, the capacitor inductor is easily burnt out and broken down.
Drawings
Fig. 1 is a structural diagram of a cavity capacitor according to the present invention;
fig. 2 is a schematic structural view of an inner conductor in the cavity capacitor of the present invention;
fig. 3 is a schematic diagram of a high pass filter of the present invention;
fig. 4 is a circuit diagram of a high pass filter of the present invention;
fig. 5 is a simulation result diagram of the high-pass filter according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and more complete, the following embodiments are further illustrated with reference to the accompanying drawings.
Example 1
In order to overcome the technical problems of low power capacity and the like of the existing capacitor, a cavity capacitor is provided.
As shown in fig. 1-3, the cavity capacitor includes a cavity 1, an inner conductor 2 is disposed through the cavity 1, an insulator 3 connected to the inner conductor 2 is disposed at an output end and an input end of the cavity capacitor, the insulator 3 is connected to the inner conductor 2 via a coaxial line, and the inner conductor 2 and the insulator 3 are sintered on the cavity 1 via a limiting plate 4;
the inner conductor 2 comprises two coaxial conductors 21 connected through a threaded post 23, a circular gasket 22 is arranged between the two coaxial conductors 21, and the threaded post 23 penetrates through the center of the circular gasket 22.
The design principle of the cavity capacitor is as follows: the inner conductor 2 of the cavity capacitor is connected with the circular gasket 22 in a penetrating way by using the threaded column 23, and then the two coaxial conductors 21 are screwed to fasten the structural part, so that the two coaxial conductors 21 are prevented from being short-circuited and a disc capacitor is formed; during installation, the insulator 3 and the inner conductor 2 are integrally sintered on the cavity by using the two limiting pieces 4, so that the assembly is convenient and the high assembly consistency is ensured. The cavity capacitor has the advantages of high self-resonant frequency and high power bearing capacity, and can realize the passing of a bandwidth signal (120W continuous wave) of 0.4GHz-6 GHz.
Furthermore, the insulators are used at the input end and the output end of the cavity capacitor, so that the connection with other devices, such as a filter and the like, is facilitated.
Further, the cavity capacitor further comprises a cover plate 5 covering the cavity 1.
Further, the resistance value of the coaxial line is 50 omega, and the threaded column 23 is a polytetrafluoroethylene threaded column.
Further, the size of the circular gasket 22 is RO6010, and the thickness of the circular gasket 22 is 0.254 mm.
Example 2
In order to realize the ultra-wideband of the filter, the conventional method uses a mode of strong coupling of multi-stage resonators to realize the ultra-wideband filter, so that the size of the filter is large, and the in-band loss of the filter is increased due to more stages. The cavity capacitor ultra-wideband high-pass filter on the market is mainly designed by a coaxial line semi-lumped element, the parallel inductor is built by a series capacitor and a short-circuit stub line through a panel capacitor, but the cavity capacitor ultra-wideband high-pass filter is large in size and extremely high in requirements on processing and assembling precision, and the requirement of a standing-wave ratio of 1.5 is difficult to meet in an ultra-wideband range.
As shown in fig. 3, the high-pass filter is formed by a cavity capacitor, the high-pass filter further includes an LC filter circuit, and an insulator at an output end of the cavity capacitor is connected to the LC filter circuit.
The design principle of the high-pass filter is as follows: the capacitor is designed in the form of using the cavity, has the characteristic of bearing high power, is high in self-resonant frequency, can realize ultra wide band, is connected with the LC filter circuit and the cavity capacitor through the insulator to form an integral circuit, can improve out-of-band suppression by adding the LC filter circuit on a bypass, does not pass through bypass inductance and capacitance of a 120W continuous wave signal of a main circuit, and enables the inductance and the capacitance to be in a small packaging form. And (3) jointly simulating the cavity capacitor and the LC, and adjusting the sizes and the installation positions of the inductance value and the capacitance value to shift up the resonance frequency so as to realize the ultra-wideband high-pass filtering of 0.4GHz-6 GHz.
Furthermore, the cavity capacitor and the LC filter circuit are separately designed and assembled, so that the design difficulty is reduced, the debugging workload is reduced, the product volume is greatly reduced, the overall dimension is 40mm multiplied by 30mm multiplied by 20mm, and the integrated design is facilitated.
Further, the high-pass filter further comprises an SMA connector, and the SMA connector is connected to the input end and the output end of the cavity capacitor and used for connecting a coaxial line.
Further, as can be seen from the circuit diagram shown in fig. 4, in the high pass filter, the input end of the cavity capacitor is connected with a first matching resistor R1 through an insulator 3, and the common connection point of the cavity capacitor and the LC filter circuit is connected with a second matching resistor R2, wherein, as can be seen from fig. 2 and 4, the inner conductor is in the form of a metal disc plus a 50 Ω coaxial line.
The first matching resistor R1 and the second matching resistor R2 are both 50 omega loads, and are matching ports added in theoretical design simulation, 50 omega port impedance is provided for a system in practical use, the simulation can be normally simulated only by the port, the first matching resistor R1 and the second matching resistor R2 are connected with the insulator 3 and then are connected with the cavity capacitor through the first coaxial line TL1 and the second TL coaxial line 2 respectively, and the impedance matching effect is achieved by transferring energy.
Further, the capacitance value of the cavity capacitor is 17pF, and the resistance values of the first coaxial line TL1 and the second coaxial line TL2 are both 50 omega.
Further, the LC filter circuit comprises a laminated inductor L and a chip capacitor C2, wherein one end of the laminated inductor L is connected with the output end of the cavity capacitor, the other end of the laminated inductor L is connected with one end of the chip capacitor C2, and the other end of the chip capacitor C2 is grounded.
Further, a high-pass filter, a chip resistor R3 is connected in parallel to two ends of the chip capacitor C2, and the resistance value of the chip resistor R3 is 50 Ω.
Further, in a high pass filter, the inductance value of the laminated inductor L is 39nH, and the capacitance value of the chip capacitor C2 is 200 pF.
Further, as shown in fig. 4, the entire filter is composed of a cavity capacitor, a stacked inductor, a chip capacitor, and a chip resistor. The cavity capacitor with the capacitance value of 17pF has the characteristic of bearing high-power high-pass signals, the passing of bandwidth signals (120W continuous waves) of 0.4GHz-6GHz can be realized, the laminated inductor L with the inductance value of 39nH and the chip capacitor C2 with the inductance value of 200pF are used for building an LC circuit, the high-pass filter is enabled to restrain the frequency point of 10 MHz-50 MHz to be more than 12dB, and finally the 50 omega chip resistor R3 is used as an absorption load.
Further, as shown in fig. 5, the miniaturized high-power high-pass filter is simulated, and the reflection coefficient is-26.68 dB to-36.17 dB in the frequency range of 0.4GHz to 6 GHz; the inhibition of 10 MHz-50 MHz is more than 12 dB; the passband insertion loss is less than 0.2 dB. Through actual test and power test of products, test data accords with simulation results, and the correctness of theoretical design is proved.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. The utility model provides a cavity condenser, includes cavity (1), run through in cavity (1) and be provided with inner conductor (2), its characterized in that:
the output end and the input end of the cavity capacitor are respectively provided with an insulator (3) connected with the inner conductor (2), the insulator (3) is connected with the inner conductor (2) through a coaxial line, and the inner conductor (2) and the insulator (3) are sintered on the cavity (1) through a limiting piece (4);
the inner conductor (2) comprises two coaxial conductors (21) connected through a threaded column (23), a circular gasket (22) is arranged between the two coaxial conductors (21), and the threaded column (23) penetrates through the center of the circular gasket (22).
2. The cavity capacitor as claimed in claim 1, wherein:
the cavity capacitor further comprises a cover plate (5) covering the cavity (1).
3. The cavity capacitor as claimed in claim 1, wherein:
the resistance value of the coaxial line is 50 omega, and the threaded column (23) is a polytetrafluoroethylene threaded column.
4. The cavity capacitor as claimed in claim 1, wherein:
the model of the circular gasket (22) is RO6010, and the thickness of the circular gasket (22) is 0.254 mm.
5. A high-pass filter comprising the cavity capacitor of any one of claims 1-4, wherein:
the high-pass filter further comprises an LC filter circuit, and an insulator (3) at the output end of the cavity capacitor is connected with the LC filter circuit.
6. A high-pass filter according to claim 5, characterized in that:
the input end of the cavity capacitor is connected with a first matching resistor R1 through an insulator (3), and the common connection point of the cavity capacitor and the LC filter circuit is connected with a second matching resistor R2.
7. A high-pass filter according to claim 6, characterized in that:
the capacitance value of the cavity capacitor is 17 pF.
8. A high-pass filter according to claim 5, characterized in that:
the LC filter circuit comprises a laminated inductor L and a chip capacitor C2, wherein one end of the laminated inductor L is connected with the output end of the cavity capacitor, the other end of the laminated inductor L is connected with one end of the chip capacitor C2, and the other end of the chip capacitor C2 is grounded.
9. A high-pass filter according to claim 8, characterized in that:
two ends of the chip capacitor C2 are connected in parallel with a chip resistor R3, and the resistance value of the chip resistor R3 is 50 omega.
10. A high-pass filter according to claim 8, characterized in that:
the inductance value of the laminated inductor L is 39nH, and the capacitance value of the chip capacitor C2 is 200 pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022347338.8U CN211980436U (en) | 2020-10-21 | 2020-10-21 | Cavity capacitor and high-pass filter formed by same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022347338.8U CN211980436U (en) | 2020-10-21 | 2020-10-21 | Cavity capacitor and high-pass filter formed by same |
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| Publication Number | Publication Date |
|---|---|
| CN211980436U true CN211980436U (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022347338.8U Active CN211980436U (en) | 2020-10-21 | 2020-10-21 | Cavity capacitor and high-pass filter formed by same |
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| CN (1) | CN211980436U (en) |
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