CN210136993U - Circular filter - Google Patents
Circular filter Download PDFInfo
- Publication number
- CN210136993U CN210136993U CN201921275760.8U CN201921275760U CN210136993U CN 210136993 U CN210136993 U CN 210136993U CN 201921275760 U CN201921275760 U CN 201921275760U CN 210136993 U CN210136993 U CN 210136993U
- Authority
- CN
- China
- Prior art keywords
- pass filter
- band
- circulator
- filter
- embedded circulator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The utility model discloses a loop filter, which comprises a bottom shell, an embedded circulator, a band-pass filter, a low-pass filter and a top cover, wherein the embedded circulator and the band-pass filter are both positioned between the bottom shell and the top cover; the embedded circulator comprises a central conductor, wherein a band-pass filter is provided with a mounting groove, the low-pass filter is arranged in the mounting groove, and the band-pass filter is respectively cascaded with the low-pass filter and the central conductor. The filter and the circulator are integrated together, so that the whole assembly is miniaturized, the space required by device installation is effectively reduced, installation personnel can conveniently install the devices, and the device packaging structure has a wide market prospect; the band-pass filter is connected with the low-pass filter in series, so that the circuit structure is compact, and the out-of-band rejection performance of the device can be improved.
Description
Technical Field
The utility model relates to a microwave passive device technical field especially relates to a loop filter.
Background
At present, microwave devices such as various circulators, isolators, filters, phase shifters and the like are widely applied to the fields of radar, aviation, aerospace, electronic communication and the like.
In the prior art, the circulator and the filter are often arranged separately, so that the circulator-filter assembly often occupies a large installation space when being arranged.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: a miniaturized loop filter is provided.
In order to solve the technical problem, the utility model discloses a technical scheme be: a loop filter comprises a bottom shell, an embedded circulator, a band-pass filter, a low-pass filter and a top cover, wherein the embedded circulator and the band-pass filter are both positioned between the bottom shell and the top cover, the embedded circulator is arranged close to the band-pass filter, the bottom shell is respectively connected with the embedded circulator and the band-pass filter, and the top cover is respectively connected with the embedded circulator and the band-pass filter; the embedded circulator comprises a central conductor, a mounting groove is formed in the band-pass filter, the low-pass filter is arranged in the mounting groove, and the band-pass filter is respectively connected with the low-pass filter and the central conductor in a cascade mode.
Further, the mounting groove includes at least one bent portion.
Furthermore, a filtering channel is arranged in the band-pass filter, and the filtering channel comprises at least one bending part.
Further, still including locating the last inner conductor of band-pass filter, the one end of inner conductor is located in the filtering channel, the central conductor passes through the inner conductor with band-pass filter cascades.
Furthermore, the bottom shell is provided with a position avoiding hole for exposing the bottom plate of the embedded circulator.
Further, the top of the embedded circulator is provided with an opening, and the top cover closes the opening.
Furthermore, a step portion is arranged at one end, away from the embedded circulator, of the band-pass filter, a circuit board is arranged on the step portion, a first microstrip line is arranged on the circuit board, and one end, away from the embedded circulator, of the low-pass filter is in cascade connection with the first microstrip line.
Furthermore, the embedded circulator is provided with three ports, one port is in cascade connection with the band-pass filter, the other port is provided with a PCB, the PCB is provided with a second microstrip line in cascade connection with the central conductor, and the rest port is provided with a PIN PIN assembly connected with the central conductor.
The beneficial effects of the utility model reside in that: the filter and the circulator are integrated together, so that the whole assembly is miniaturized, the space required by device installation is effectively reduced, installation personnel can conveniently install the devices, and the device packaging structure has a wide market prospect; the band-pass filter is connected with the low-pass filter in series, so that the circuit structure is compact, and the out-of-band rejection performance of the device can be improved.
Drawings
Fig. 1 is a schematic structural diagram of an overall structure of a ring filter according to a first embodiment of the present invention;
fig. 2 is an exploded view of a loop filter according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of an internal structure of a ring filter according to a first embodiment of the present invention;
fig. 4 is a top view of a circuit board in a loop filter according to a first embodiment of the present invention.
Description of reference numerals:
1. a bottom case; 2. an embedded circulator; 3. a band-pass filter; 4. a low-pass filter; 5. a top cover; 6. a center conductor; 7. mounting grooves; 8. avoiding holes; 9. a bending section; 10. a filtering channel; 11. an inner conductor; 12. a step portion; 13. a circuit board; 14. a first microstrip line.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 to 4, a loop filter includes a bottom case 1, an embedded circulator 2, a band-pass filter 3, a low-pass filter 4 and a top cover 5, wherein the embedded circulator 2 and the band-pass filter 3 are both located between the bottom case 1 and the top cover 5, the embedded circulator 2 is arranged close to the band-pass filter 3, the bottom case 1 is respectively connected to the embedded circulator 2 and the band-pass filter 3, and the top cover 5 is respectively connected to the embedded circulator 2 and the band-pass filter 3; the embedded circulator 2 comprises a central conductor 6, a mounting groove 7 is arranged on the band-pass filter 3, the low-pass filter 4 is arranged in the mounting groove 7, and the band-pass filter 3 is respectively cascaded with the low-pass filter 4 and the central conductor 6.
From the above description, the beneficial effects of the present invention are: the filter and the circulator are integrated together, so that the whole assembly is miniaturized, the space required by device installation is effectively reduced, installation personnel can conveniently install the devices, and the device packaging structure has a wide market prospect; the band-pass filter 4 in series not only can make the circuit structure compact but also can improve the out-of-band rejection performance of the device.
Further, the mounting groove 7 includes at least one bent portion 9.
Further, a filtering channel 10 is arranged in the band-pass filter 3, and the filtering channel 10 includes at least one bending portion.
As can be seen from the above description, the arrangement of the bending portion 9 and the bending portion effectively reduces the occupied space of the loop filter on the premise of enhancing the coupling between the low-pass filter 4 and the band-pass filter 3, so that the loop filter is more miniaturized, and the parasitic pass-band can be well suppressed.
Further, still including locating inner conductor 11 on band-pass filter 3, inner conductor 11's one end is located in filtering channel 10, central conductor 6 passes through inner conductor 11 with band-pass filter 3 cascades.
As can be seen from the above description, the inner conductor 11 can be used to adjust the performance parameters of the band-pass filter 3.
Further, a position avoiding hole 8 for exposing the bottom plate of the embedded circulator 2 is formed in the bottom shell 1.
As can be seen from the above description, such a structure is advantageous for reducing the thickness of the loop filter, so that the loop filter is more compact.
Further, the top of the embedded circulator 2 has an opening, and the top cover 5 closes the opening.
Further, a step portion 12 is arranged at one end of the band-pass filter 3 away from the embedded circulator 2, a circuit board 13 is arranged on the step portion 12, a first microstrip line 14 is arranged on the circuit board 13, and one end of the low-pass filter 4 away from the embedded circulator 2 is cascaded with the first microstrip line 14.
Further, the embedded circulator 2 is provided with three ports, one of the ports is in cascade connection with the band-pass filter 3, the other port is provided with a PCB board, the PCB board is provided with a second microstrip line in cascade connection with the central conductor 6, and the remaining port is provided with a PIN assembly connected with the central conductor 6.
As can be seen from the above description, the external output signal is transmitted by the microstrip line, so that the loop filter can be better connected to the front and rear units.
Example one
Referring to fig. 1 to 4, a first embodiment of the present invention is: referring to fig. 1 to 3, a circulator filter includes a bottom case 1, an embedded circulator 2, a band-pass filter 3, a low-pass filter 4 and a top cover 5, wherein the embedded circulator 2 and the band-pass filter 3 are both located between the bottom case 1 and the top cover 5, the embedded circulator 2 is arranged close to the band-pass filter 3, the bottom case 1 is connected to the embedded circulator 2 and the band-pass filter 3, and the top cover 5 is connected to the embedded circulator 2 and the band-pass filter 3; the embedded circulator 2 comprises a central conductor 6, a mounting groove 7 is arranged on the band-pass filter 3, the low-pass filter 4 is arranged in the mounting groove 7, and the band-pass filter 3 is respectively cascaded with the low-pass filter 4 and the central conductor 6. Optionally, the top cover 5 is connected to the embedded circulator 2 and the band-pass filter 3 through screws, and the bottom case 1 is connected to the embedded circulator 2 and the band-pass filter 3 through screws.
The bandpass filter 3 is connected with the low-pass filter 4 in series, and has the advantages of compact circuit structure, high out-of-band rejection and the like. According to the requirements of the loop filter on wide pass band and high suppression of left and right frequency bands, the band-pass filter 3 in the embodiment adopts a generalized Chebyshev band-pass filter, and the cross-coupling structure of the low-pass filter 4 and the band-pass filter 3 is utilized to realize the far-end and near-end suppression requirements.
The top of the embedded circulator 2 has an opening, and the top cover 5 closes the opening. In order to reduce the thickness of the ring filter, the bottom case 1 is provided with a position avoiding hole 8 for exposing the bottom plate of the embedded circulator 2.
The mounting groove 7 comprises at least one bending portion 9, that is, the low pass filter 4 is bent at least once, a filtering channel 10 is arranged in the band pass filter 3, and the filtering channel 10 comprises at least one bending portion. In this embodiment, the mounting groove 7 is L-shaped, and the filtering channel 10 is S-shaped.
Still including locating inner conductor 11 on the band pass filter 3, the one end of inner conductor 11 is located in filtering channel 10, the other end of inner conductor 11 with central conductor 6 is connected, promptly central conductor 6 passes through inner conductor 11 with band pass filter 3 cascades.
Preferably, the central conductor 6 is a strip line junction conductor, and the strip line junction conductor can be designed into a wide-band circulator at a proper working frequency and by adding a wide-band matching circuit. The circuit structure of the strip line knot conductor comprises a disc knot circuit, a triangular knot circuit and a double-Y knot circuit, in the embodiment, the circuit structure of the strip line knot conductor is the double-Y knot circuit, and the double-Y knot strip line knot conductor can be used for making the ring filter smaller through the stop band suppression of the band-pass filter 3 and the low-pass filter 4.
Referring to fig. 1, fig. 3 and fig. 4, a step portion 12 is disposed at an end of the band-pass filter 3 away from the embedded circulator 2, a circuit board 13 is disposed on the step portion 12, a first microstrip line 14 is disposed on the circuit board 13, and an end of the low-pass filter 4 away from the embedded circulator 2 is cascaded with the first microstrip line 14.
The embedded circulator 2 is provided with three ports, one of the ports is cascaded with the band-pass filter 3, the other port is provided with a PCB, the PCB is provided with a second microstrip line cascaded with the central conductor 6, and the rest one of the ports is provided with a PIN needle assembly connected with the central conductor 6. In fig. 3, the PCB is disposed at the lower left corner port of the embedded circulator 2, and the PIN assembly is disposed at the lower right corner port.
The performance test results of the loop filter of this embodiment are shown in table 1,
TABLE 1 Loop Filter Performance test results Table
As can be seen from Table 1, the loop filter of this embodiment has an insertion loss of < 1dB, a reverse isolation of > 15dB, an input-output standing wave ratio of < 1.5, and a required out-of-band rejection frequency range with rejection of less than or equal to-35 dB. Therefore, the ring microwave device of the embodiment not only has small size, but also has good out-of-band anti-interference performance, and is particularly suitable for C wave band.
In summary, the ring filter provided by the utility model has small volume, convenient installation and wide market prospect; the band-pass filter is connected with the low-pass filter in series, so that the circuit structure is compact, and the out-of-band rejection performance of the device can be improved.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (8)
1. A loop filter, comprising: the optical fiber circulator comprises a bottom shell, an embedded circulator, a band-pass filter, a low-pass filter and a top cover, wherein the embedded circulator and the band-pass filter are both positioned between the bottom shell and the top cover, the embedded circulator is arranged close to the band-pass filter, the bottom shell is respectively connected with the embedded circulator and the band-pass filter, and the top cover is respectively connected with the embedded circulator and the band-pass filter; the embedded circulator comprises a central conductor, a mounting groove is formed in the band-pass filter, the low-pass filter is arranged in the mounting groove, and the band-pass filter is respectively connected with the low-pass filter and the central conductor in a cascade mode.
2. The loop filter of claim 1, wherein: the mounting groove includes at least one curved portion.
3. The loop filter of claim 1, wherein: the band-pass filter is internally provided with a filtering channel, and the filtering channel comprises at least one bending part.
4. The loop filter of claim 3, wherein: still including locating the last inner conductor of band pass filter, the one end of inner conductor is located in the filtering channel, the center conductor passes through the inner conductor with band pass filter cascades.
5. The loop filter of claim 1, wherein: and the bottom shell is provided with a position avoiding hole for exposing the bottom plate of the embedded circulator.
6. The loop filter of claim 1, wherein: the top of the embedded circulator is provided with an opening, and the top cover closes the opening.
7. The loop filter of claim 1, wherein: the low-pass filter is characterized in that a step portion is arranged at one end, away from the embedded circulator, of the band-pass filter, a circuit board is arranged on the step portion, a first microstrip line is arranged on the circuit board, and one end, away from the embedded circulator, of the low-pass filter is cascaded with the first microstrip line.
8. The loop filter of claim 1, wherein: the embedded circulator is provided with three ports, one port is in cascade connection with the band-pass filter, the other port is provided with a PCB, the PCB is provided with a second microstrip line in cascade connection with the central conductor, and the rest port is provided with a PIN PIN assembly connected with the central conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921275760.8U CN210136993U (en) | 2019-08-06 | 2019-08-06 | Circular filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921275760.8U CN210136993U (en) | 2019-08-06 | 2019-08-06 | Circular filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210136993U true CN210136993U (en) | 2020-03-10 |
Family
ID=69707993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921275760.8U Active CN210136993U (en) | 2019-08-06 | 2019-08-06 | Circular filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210136993U (en) |
-
2019
- 2019-08-06 CN CN201921275760.8U patent/CN210136993U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103633400B (en) | A kind of micro-strip duplexer based on electromagnetism hybrid coupled | |
| CN103928732A (en) | Micro-strip line absorption band-pass filter | |
| Zhang et al. | Compact and harmonic suppression Wilkinson power divider with short circuit anti-coupled line | |
| CN106099278A (en) | Resonant element and wave filter | |
| CN105958165B (en) | A kind of three frequency range of miniaturization high isolation, six tunnel micro-strip combiner | |
| CN202352808U (en) | Microstrip double-knot isolator | |
| CN100495814C (en) | Any dual-frequency band 3dB branch directional coupler | |
| CN210136993U (en) | Circular filter | |
| CN109638393A (en) | A kind of miniaturization W-waveband filter | |
| CN204067529U (en) | A kind of plane CQ band pass filter | |
| CN109066024A (en) | A kind of big frequency based on mode composite transmission line compares double-passband filter | |
| CN201540943U (en) | Small-size isolator for GSM communication system | |
| CN201266660Y (en) | Embedded miniaturization high intermodulation isolator | |
| CN208955160U (en) | A kind of big frequency based on mode composite transmission line compares double-passband filter | |
| CN201266663Y (en) | Embedded high intermodulation circulator for TD-SCDMA system | |
| US20200280115A1 (en) | Integrated filter system and antenna system | |
| CN103337678A (en) | Crossed coupling substrate integrated waveguide filter with steep side band characteristic | |
| CN209948010U (en) | Ultra-wideband filter with miniaturized broadside coupling structure | |
| Gu et al. | Miniaturization and harmonic suppression open-loop resonator bandpass filter with capacitive terminations | |
| CN201266661Y (en) | Embedded miniaturization high intermodulation isolator | |
| CN203883094U (en) | Micro-strip diplexer based on electromagnetic mixed coupling | |
| CN201629391U (en) | Mini-circulator for microwave communication system | |
| CN106848515B (en) | Integrated filter system and antenna system | |
| CN114464974B (en) | Circulator with filtering characteristic | |
| CN201266662Y (en) | Embedded miniaturization high intermodulation isolator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |