CN210040498U - Dual-frequency band-pass filtering power divider - Google Patents
Dual-frequency band-pass filtering power divider Download PDFInfo
- Publication number
- CN210040498U CN210040498U CN201921096388.4U CN201921096388U CN210040498U CN 210040498 U CN210040498 U CN 210040498U CN 201921096388 U CN201921096388 U CN 201921096388U CN 210040498 U CN210040498 U CN 210040498U
- Authority
- CN
- China
- Prior art keywords
- branch
- dual
- hole
- matching
- power divider
- 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 provides a ware is divided to dual-frenquency band-pass filtering merit, it is the axisymmetric shape, include: the first microstrip line structure, the second microstrip line structure, the third microstrip line structure, the input end, the first output end and the second output end; the first microstrip line structure comprises a strip-shaped input part and a strip-shaped output part, the input part is vertically connected with the output part, one end of the input part is used as an input end, and the other end of the input part is connected with the midpoint of the output part; the third microstrip line structure comprises a third impedance matching part and a fourth impedance matching part which are symmetrically arranged by taking the perpendicular bisector of the middle axis part as a symmetry axis; the third impedance matching section includes an "Jiong" shaped structure consisting of a first matching branch, a second matching branch, and a third matching branch. The utility model has wider relative bandwidth and better center isolation, and reduces the interference between the pass bands; and the size is small, the structure is compact, and the occupied area is small.
Description
Technical Field
The utility model relates to a ware technical field is divided to the merit, in particular to ware is divided to dual-frenquency band-pass filtering merit.
Background
Multifrequency filters are widely used in multi-mode communication systems, for example, mobile phones and Wi-Fi (wireless local area network) routers, which are already indispensable in our daily life, are the most common multi-mode communication terminals, and they can operate in the ISM bands of 2.4GHz (gigahertz) and 5GHz (the bands defined by the radio communication bureau of the international telecommunication union for use by industrial, scientific and medical institutions).
The multifrequency filter can be implemented in a number of ways:
the simplest method is to realize the multi-passband filtering performance by cascading or connecting a plurality of bandpass filters working in different frequency bands in parallel. The design process for realizing the multi-frequency filtering by adopting the mode is simple, the passband frequencies and the bandwidths of the filters can be respectively and independently designed without influencing each other, but the problem of overlarge circuit size of the whole filter is also avoided, and the miniaturization design of the whole system is not convenient to realize.
The multi-frequency filtering performance is realized by the characteristic that the multi-mode resonator has a plurality of resonant frequencies, and the multi-frequency filtering performance can be realized by adopting a multi-mode single resonator and a mode of coupling a harmonic pass band of the multi-mode resonator. Compared with the mode of cascading a plurality of filters, the multi-mode structure is adopted to realize the filter, so that the circuit size is greatly reduced, the miniaturization and the lightweight production are facilitated, but because a plurality of pass bands are realized through the same physical size structure, the bandwidth and the center frequency of each single pass band cannot be independently designed, the mutual interference and the isolation between the plurality of pass bands are poor, and the design controllability is lacked in comparison with a multi-stage cascading filter.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a ware is divided to dual-frenquency band-pass filtering merit in order to overcome the defect that mutual interference, isolation are poor between a plurality of passbands of prior art's multifrequency filter.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
a dual-band bandpass filter power divider, which is axisymmetric in shape, comprising: the first microstrip line structure, the second microstrip line structure, the third microstrip line structure, the input end, the first output end and the second output end;
the first microstrip line structure comprises a strip-shaped input part and a strip-shaped output part, the input part is vertically connected with the output part, one end of the input part is used as an input end, and the other end of the input part is connected with the midpoint of the output part;
the second microstrip line structure is in an axial symmetry shape and comprises a first impedance matching part, a second impedance matching part and a strip-shaped middle shaft part, wherein the middle perpendicular line of the middle shaft part is the symmetry axis of the dual-frequency band-pass filter power divider, the central line of the middle shaft part is the symmetry axis of the second microstrip line structure, and the first impedance matching part and the second impedance matching part are symmetrically arranged by taking the middle perpendicular line of the middle shaft part as the symmetry axis; the first impedance matching part comprises a main part, a first branch connected with one end of the main part and a second branch connected with the other end of the main part, the main part is vertically and crossly connected with the middle shaft part, and one end of the output part is vertically connected with the main part;
the third microstrip line structure comprises a third impedance matching part and a fourth impedance matching part which are symmetrically arranged by taking the perpendicular bisector of the middle axis part as a symmetry axis; the third impedance matching part comprises an Jiong-shaped structure consisting of a first matching branch, a second matching branch and a third matching branch, the first matching branch is vertically connected with the trunk part, the first matching branch and the output part are respectively arranged at two sides of the middle shaft part, the first matching branch and the second branch are respectively arranged at two sides of the trunk part, and the length of the third matching branch is greater than that of the first matching branch; compared with the first matching branch, the third matching branch is arranged on one side far away from the input end, and one end of the third matching branch far away from the second matching branch is used as a first output end;
the second output end and the first output end are symmetrically arranged.
Preferably, the first and second branches are L-shaped.
Preferably, the dual-band bandpass filter power divider further includes a first resistor, and the first resistor is connected across the third impedance matching section and the fourth impedance matching section.
Preferably, one end of the first resistor is connected to a connection portion of the first matching branch and the second matching branch.
Preferably, the dual-band bandpass filter power divider further includes a second resistor, and the second resistor is connected across the third impedance matching unit and the fourth impedance matching unit.
Preferably, one end of the second resistor is connected to a connection portion of the second matching branch and the third matching branch.
Preferably, the middle shaft part is provided with a first hole, a second hole, a third hole and a fourth hole, the first hole and the second hole are arranged in the middle of the middle shaft part, and the third hole and the fourth hole are respectively arranged at two end parts of the middle shaft part;
the dual-frequency band-pass filtering power divider further comprises a first metal cylinder, a second metal cylinder, a third metal cylinder and a fourth metal cylinder, one end of the first metal cylinder is connected with the edge of the first hole, one end of the second metal cylinder is connected with the edge of the second hole, one end of the third metal cylinder is connected with the edge of the third hole, and one end of the fourth metal cylinder is connected with the edge of the fourth hole.
Preferably, the first and second holes have the same diameter, the third and fourth holes have the same diameter, and the diameter of the first hole is larger than that of the third hole.
Preferably, the first hole, the second hole, the third hole and the fourth hole are filled with solder.
Preferably, the center frequencies of the two pass bands of the dual-band bandpass filter power divider are 2.5GHz and 5.5GHz, respectively.
The utility model discloses an actively advance the effect and lie in: the dual-frequency band-pass filtering power divider has wider relative bandwidth and better center isolation, and reduces the interference between pass bands; and the size is small, the structure is compact, and the occupied area is small.
Drawings
Fig. 1 is a schematic structural diagram of a dual-band bandpass filter power divider according to a preferred embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a first microstrip line structure of a dual-band bandpass filter power divider according to a preferred embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a second microstrip line structure of a dual-band bandpass filter power divider according to a preferred embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a third microstrip line structure of a dual-band bandpass filter power divider according to a preferred embodiment of the present invention.
Fig. 5 is a side view of a second microstrip line structure of a dual-band bandpass filter power divider according to a preferred embodiment of the present invention.
Fig. 6 is a schematic diagram of the test result and simulation result of the S parameter of the dual-band bandpass filter power divider according to a preferred embodiment of the present invention.
Fig. 7 is a schematic diagram of the test result and simulation result of the isolation of the dual-band bandpass filter power divider according to a preferred embodiment of the present invention.
Detailed Description
The present invention will be more clearly and completely described with reference to the following preferred embodiments and the accompanying drawings.
In this embodiment, referring to fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, the dual-band bandpass filter power divider is axisymmetric, and X represented by a dotted line1Is the symmetry axis of the dual-frequency band-pass filtering power divider. The dual-band bandpass filter power divider is arranged on a substrate B. The dual-frequency band-pass filtering power divider is a one-to-two power divider and comprises an input end (an input end 11) and two output ends (a first output end 12 and a second output end 13); the dual-band bandpass filter power divider further comprises a first microstrip line structure 1, a second microstrip line structure 2 and a third microstrip line structure 3.
The first microstrip line structure 1 includes a strip-shaped input portion 101 and a strip-shaped output portion 102, the input portion 101 is connected to the output portion 102 perpendicularly, one end of the input portion 101 serves as an input terminal 11, and the other end of the input portion 101 is connected to a midpoint of the output portion 102.
The second microstrip line structure 2 has an axisymmetric shape, and the second microstrip line structure 2 includes a first impedance matching section 22, a second impedance matching section 23, and a bar-shaped central axis section 21. Symmetry axis X of double-frequency band-pass filtering power divider1A perpendicular bisector of the middle shaft portion 21; center line X of middle shaft 212Which is the axis of symmetry of the second microstrip line structure 2. The first impedance matching section 22 and the second impedance matching section 23 have a perpendicular bisector of the middle shaft section 21 as a symmetry axisAre symmetrically arranged. The first impedance matching section 22 includes a trunk 221, a first branch 222 connected to one end of the trunk 221, and a second branch 223 connected to the other end of the trunk 221, the trunk 221 is perpendicularly cross-connected to the middle shaft 21, and a length L from one end of the middle shaft 21 to the trunk 22110Is 4mm (millimeters). One end of the output part 102 is vertically connected to the trunk part 221. The second impedance matching section 23 is symmetrical to the first impedance matching section 22, and the detailed structure thereof is not described herein.
The third microstrip line structure 3 includes a third impedance matching section 31 and a fourth impedance matching section 32 that are provided symmetrically with respect to the perpendicular bisector of the middle axis portion as the symmetry axis. The third impedance matching section 31 includes an "Jiong" shaped structure composed of a first matching branch 311, a second matching branch 312, and a third matching branch 313. The first matching branch 311 is vertically connected to the trunk 221, and the first matching branch 311 and the output portion 102 are respectively disposed on two sides of the middle shaft 21. The first matching branch 311 and the second branch 223 are disposed on two sides of the trunk 221, respectively. The length of the third matching branch 313 is greater than the length of the first matching branch 311; compared to the first matching branch 311, the third matching branch 313 is disposed on a side away from the input end 11, and an end of the third matching branch 313 away from the second matching branch 312 serves as the first output end 12. The fourth impedance matching unit 32 is symmetrical to the third impedance matching unit 31, and the detailed structure thereof is not described herein.
For better impedance matching, the first branch 222 and the second branch 223 are L-shaped. The first branch 222 comprises a first sub-branch 2221 and a second sub-branch 2222 that are perpendicular to each other; first sub-branch 2221 is perpendicularly connected to main portion 221.
In order to obtain a better impedance matching effect, the dual-band bandpass filter power divider of the embodiment further includes a first resistor R1First resistance R1And is connected across the third impedance matching section 31 and the fourth impedance matching section 32. As a preferred embodiment, the first resistor R1Is connected to the connection of the first 311 and second 312 matching branches; a first resistor R1And the other end thereof is connected to a corresponding position on the fourth impedance matching section 32. A first resistor R1Is preferably taken asThe range is 180-220 ohms, with 200 ohms being the most preferred.
In order to obtain a better impedance matching effect, the dual-band bandpass filter power divider of the embodiment further includes a second resistor R2A second resistance R2And is connected across the third impedance matching section 31 and the fourth impedance matching section 32. As a preferred embodiment, the second resistor R2Is connected to the junction of the second matching branch 312 and the third matching branch 313; a second resistor R2And the other end thereof is connected to a corresponding position on the fourth impedance matching section 32. A second resistor R2The preferred value range is 360-420 ohms, with 390 ohms being the best.
In order to obtain a better impedance matching effect, the middle shaft portion is provided with a first hole 241, a second hole 242, a third hole 243, and a fourth hole 244, the first hole 241 and the second hole 242 are disposed in the middle of the middle shaft portion 21, and the third hole 243 and the fourth hole 244 are disposed at both end portions of the middle shaft portion 21, respectively; the first and second holes 241 and 242 are arranged at X1The third and fourth holes 243 and 244 are arranged in X for symmetry axis symmetry1Is symmetrically arranged for a symmetry axis.
In order to obtain a better impedance matching effect, the dual-band bandpass filter power divider further includes a first metal cylinder 245, a second metal cylinder 246, a third metal cylinder 247, and a fourth metal cylinder 248. One end of the first metal cylinder 245 is connected to an edge of the first hole 241 (both have the same diameter), one end of the second metal cylinder 246 is connected to an edge of the second hole 242 (both have the same diameter), one end of the third metal cylinder 247 is connected to an edge of the third hole 243 (both have the same diameter), and one end of the fourth metal cylinder 248 is connected to an edge of the fourth hole 244 (both have the same diameter).
The first and second holes 241 and 242 have the same diameter, the third and fourth holes 243 and 244 have the same diameter, and the first hole 241 has a diameter larger than that of the third hole 243. As a preferred embodiment, the diameter d of the third aperture 243 is1Is 0.8 mm; diameter d of the first hole 2412Is 1.2 mm. Further, the first hole 241, the second hole 242, the third hole 243, and the fourth hole 244 are filled with solder.
As a preferred embodiment, the input part 101 width W11.2mm, length L of input part 1011Is 6 mm; the input part 101 is arranged parallel to the trunk part 221 with a distance L therebetween2Is 2.4 mm. Length L of first sub-branch 22218Is 7 mm; distance L between first sub-branch 2221 and middle shaft 2139.8 mm; length L of second sub-branch 22229Is 6.2mm, and the width W of the second sub-branch 22227Is 0.5 mm. Distance L from one end of trunk 221 to output 1024Is 3.5 mm; distance L from the other end of the trunk 221 to the first matching branch 31176.6mm, the width W of the trunk portion 2215Is 2 mm. Distance L between output part 102 and middle shaft part 215Is 6 mm. Distance L between middle shaft 21 and first matching branch 3116Is 3.1 mm. Distance L from one end of middle shaft 21 to trunk 221104mm, width W of the middle shaft part 216Is 1.5 mm. Length L of the second matching branch 3121311.6mm, the width W of the second matching branch 3129Is 0.6 mm. Length L of first matching branch 31112Is 2mm, the width W of the first matching branch 3114Is 0.6 mm. Length L of the third matching branch 3131412mm, width W of the third matching branch 3138Is 2 mm. Trunk 221 and axis of symmetry X1Distance L between11Is 3 mm.
In the design implementation process of the dual-band bandpass filter power divider of the embodiment, in consideration of the odd-even mode characteristics, firstly, a multi-mode resonator is designed according to the SIR (step impedance resonator) theory about the middle loading short-circuit branch, and an appropriate transmission line characteristic impedance and electrical length are selected, so that four resonance modes (feven _1, feven _2, fodd _1 and fodd _2) of the multi-mode resonator are paired and appear in two pass bands respectively. Then, an appropriate position is selected for tap coupling. After designing the multimode resonator, two multimode resonators are used to replace the lambda/4 line (a transmission line) in the traditional Vikinson power divider, and two loaded resistors (a first resistor R) are used between two output ports (a first output end and a second output end)1And a second resistor R2) The form of (1) improves the isolation performance. Finally, the double frequency is obtained through the simulation optimization of electromagnetic simulation softwareAnd (4) size parameters of the band-pass filtering power divider. A first resistor R1And a second resistor R2After odd-mode equivalent analysis is carried out on the topological structure of the dual-frequency band-pass filtering power divider, the resistance value of the power divider continuously adjusts the first resistor R through single-port simulation1And a second resistor R2To obtain the best echo response.
When the dual-band bandpass filter power divider of this embodiment is used, the input terminal 11, the first output terminal 12, and the second output terminal 13 are respectively connected to a radio frequency plug. After being input from the input terminal 11, the rf signal is divided into two paths through the output part 102. One of the paths passes through the first impedance matching unit 22 and the third impedance matching unit 31 in sequence and is output from the first output terminal 12. The other path passes through the corresponding path and is output by the second output end 13.
The performance indexes of the dual-band bandpass filter power divider of the embodiment are as follows: the center frequencies of the two pass bands are respectively 2.5GHz and 5.5GHz, the 1dB relative bandwidths corresponding to the two pass bands are respectively 10.8% (corresponding to 2.38-2.65 GHz) and 10% (corresponding to 5.2-5.75 GHz), the insertion loss is less than 1.5dB, the in-band feedback coefficient is less than-15 dB, and the in-band isolation is greater than-15 dB.
FIG. 6 shows the test result of the S parameter (S) of the dual-band bandpass filter power divider of the present embodiment21Test results and S11Test results) and simulation results (S)21Simulation results and S11Simulation results). According to the odd-even mode characteristic of the double-frequency band-pass filtering power divider, whether a first resistor R is arranged or not is judged1And a second resistor R2Will not be aligned with the forward transmission coefficient S21And an input reflection coefficient S11Influence is produced, only the isolation S is influenced23. The center frequencies of two pass bands of the double-frequency band-pass filter power divider obtained through measurement are 2.56GHz and 5.53GHz, the corresponding insertion losses are 4.01dB and 4.11dB, the relative bandwidths of 1dB are 13.1 percent and 9.4 percent, and the in-band reflection is better than-10 dB.
FIG. 7 shows the isolation S at the output of the dual-band bandpass filter power divider23Including loading the second resistor R2Simulation result of time (S)23Simulation result (with R)2) Not loaded with the second resistor R), without applying the second resistor R2Simulation result of time (S)23Simulation result (without R)2) ) is loaded with a second resistance R2Test result of time (S)23Test results (with R)2) Not loaded with the second resistor R), without applying the second resistor R2Test result of time (S)23Test results (without R)2)). Loading a second resistor R2And not loading the second resistor R2In contrast, although there is some degradation in isolation in the first pass band, the isolation is improved by 5dB, better than 15dB, in the second pass band.
As can be seen from the comparison of the simulation results and the experimental results, the simulation results and the experimental results are basically consistent, the passband range has slight frequency deviation, the center frequency measured by the experiment is larger than the simulation results, the in-band reflection coefficient is deteriorated by about 5dB, the errors are probably because the actual dielectric constant of the substrate is about 3.55 and smaller than the simulated dielectric constant, and in addition, the difference between the experimental results and the simulation results is caused to a certain extent by the processing errors of the substrate and the distribution parameter effect generated by the short-circuit through holes.
Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. The utility model provides a ware is divided to dual-frenquency band-pass filtering merit, its characterized in that, the ware is divided to dual-frenquency band-pass filtering merit is the axial symmetry shape, includes: the first microstrip line structure, the second microstrip line structure, the third microstrip line structure, the input end, the first output end and the second output end;
the first microstrip line structure comprises a strip-shaped input part and a strip-shaped output part, the input part is vertically connected with the output part, one end of the input part is used as the input end, and the other end of the input part is connected with the midpoint of the output part;
the second microstrip line structure is in an axisymmetric shape, the second microstrip line structure comprises a first impedance matching part, a second impedance matching part and a strip-shaped middle shaft part, a perpendicular bisector of the middle shaft part is a symmetric axis of the dual-frequency band-pass filter power divider, a center line of the middle shaft part is a symmetric axis of the second microstrip line structure, and the first impedance matching part and the second impedance matching part are symmetrically arranged by taking the perpendicular bisector of the middle shaft part as the symmetric axis; the first impedance matching section includes a trunk section, a first branch connected to one end of the trunk section, and a second branch connected to the other end of the trunk section, the trunk section is perpendicularly cross-connected to the middle axis section, and one end of the output section is perpendicularly connected to the trunk section;
the third microstrip line structure comprises a third impedance matching part and a fourth impedance matching part which are symmetrically arranged by taking the perpendicular bisector of the middle axis part as a symmetry axis; the third impedance matching part comprises an Jiong-shaped structure consisting of a first matching branch, a second matching branch and a third matching branch, wherein the first matching branch is vertically connected with the trunk part, the first matching branch and the output part are respectively arranged at two sides of the middle shaft part, the first matching branch and the second branch are respectively arranged at two sides of the trunk part, and the length of the third matching branch is greater than that of the first matching branch; compared with the first matching branch, the third matching branch is arranged on one side far away from the input end, and one end of the third matching branch far away from the second matching branch is used as the first output end;
the second output end and the first output end are symmetrically arranged.
2. The dual-band bandpass filtered power divider of claim 1 wherein the first branch and the second branch are both L-shaped.
3. The dual-band bandpass filtered power divider of claim 2 further comprising a first resistor connected across the third impedance matching section and the fourth impedance matching section.
4. The dual-band bandpass filter power divider of claim 3, wherein one end of the first resistor is connected to a connection portion of the first matching branch and the second matching branch.
5. The dual-band bandpass filtered power divider of claim 4 further comprising a second resistor connected across the third impedance matching section and the fourth impedance matching section.
6. The dual-band bandpass filter power divider of claim 5, wherein one end of the second resistor is connected to a connection portion of the second matching branch and the third matching branch.
7. The dual-band bandpass filter power divider as claimed in claim 6, wherein the middle shaft portion has a first hole, a second hole, a third hole and a fourth hole, the first hole and the second hole are disposed in the middle of the middle shaft portion, and the third hole and the fourth hole are disposed at two ends of the middle shaft portion, respectively;
the dual-frequency band-pass filtering power divider further comprises a first metal cylinder, a second metal cylinder, a third metal cylinder and a fourth metal cylinder, one end of the first metal cylinder is connected with the edge of the first hole, one end of the second metal cylinder is connected with the edge of the second hole, one end of the third metal cylinder is connected with the edge of the third hole, and one end of the fourth metal cylinder is connected with the edge of the fourth hole.
8. The dual-band bandpass filtered power divider of claim 7 wherein the first aperture and the second aperture have the same diameter, the third aperture and the fourth aperture have the same diameter, and the diameter of the first aperture is greater than the diameter of the third aperture.
9. The dual-band bandpass filter power divider of claim 8 wherein the first hole, the second hole, the third hole and the fourth hole are filled with solder.
10. The dual-band bandpass filter power divider of claim 9 wherein the center frequencies of the two pass bands of the dual-band bandpass filter power divider are 2.5GHz and 5.5GHz, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096388.4U CN210040498U (en) | 2019-07-11 | 2019-07-11 | Dual-frequency band-pass filtering power divider |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096388.4U CN210040498U (en) | 2019-07-11 | 2019-07-11 | Dual-frequency band-pass filtering power divider |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210040498U true CN210040498U (en) | 2020-02-07 |
Family
ID=69349664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921096388.4U Active CN210040498U (en) | 2019-07-11 | 2019-07-11 | Dual-frequency band-pass filtering power divider |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210040498U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112002977A (en) * | 2020-08-22 | 2020-11-27 | 佛山市粤海信通讯有限公司 | Microstrip combiner |
| CN113381142A (en) * | 2021-05-21 | 2021-09-10 | 南京智能高端装备产业研究院有限公司 | Three-passband power division filter with high frequency selectivity |
-
2019
- 2019-07-11 CN CN201921096388.4U patent/CN210040498U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112002977A (en) * | 2020-08-22 | 2020-11-27 | 佛山市粤海信通讯有限公司 | Microstrip combiner |
| CN112002977B (en) * | 2020-08-22 | 2021-11-16 | 佛山市粤海信通讯有限公司 | Microstrip combiner |
| CN113381142A (en) * | 2021-05-21 | 2021-09-10 | 南京智能高端装备产业研究院有限公司 | Three-passband power division filter with high frequency selectivity |
| CN113381142B (en) * | 2021-05-21 | 2022-03-11 | 南京智能高端装备产业研究院有限公司 | Three-passband power division filter with high frequency selectivity |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109473756B (en) | kinds of fully reconfigurable differential filter | |
| CN109755703B (en) | Differential dual-frequency band-pass filter with high selectivity | |
| CN210040498U (en) | Dual-frequency band-pass filtering power divider | |
| CN101719579A (en) | Multi-band bandstop filter and multi-band bandpass filter | |
| CN111668580A (en) | Dielectric filter with steep out-of-band rejection and antenna | |
| CN105514547A (en) | Low-pass band-pass five-duplex based on novel frequency separation structure | |
| CN113922032A (en) | Filtering power divider with third-order filtering response | |
| CN112072242A (en) | Filter structure and filter | |
| CN112909460A (en) | Balanced microstrip filter with common-mode and differential-mode signal reflection-free characteristics | |
| Zhu et al. | A compact waveguide quasi-elliptic dual-band filter | |
| CN117317551A (en) | Filter and communication equipment | |
| CN115275545A (en) | Compact absorption type filtering power divider | |
| CN212434808U (en) | Filter structure and filter | |
| CN112332053B (en) | Wide-stopband filtering power divider | |
| JP2000068711A (en) | Antenna multicoupler and communication equipment | |
| CN111384535B (en) | Double-passband power division filter | |
| CN111682292B (en) | Four-way power division filter based on four-mode resonator | |
| KR100369211B1 (en) | Monoblock dielectric duplexer | |
| CN212182505U (en) | Dielectric filter with steep out-of-band rejection and antenna | |
| CN110137644B (en) | High-selectivity wide-stop-band balance filter based on slot line | |
| CN109980327B (en) | Adjustable dual-mode band-pass filter with high selectivity and constant bandwidth | |
| CN113708030A (en) | Balance ultra-wideband band-pass filter based on multimode slot line resonator | |
| CN206076460U (en) | A kind of plane CQ duplexer based on new matching network | |
| Xu et al. | A miniaturized low-loss absorptive bandpass filter using IPD technology | |
| Matsumoto et al. | A miniaturized dielectric monoblock duplexer matched by the buried impedance transforming circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |