CN113036332B - Dual-mode dual-passband dielectric filter capable of generating out-of-band zero - Google Patents
Dual-mode dual-passband dielectric filter capable of generating out-of-band zero Download PDFInfo
- Publication number
- CN113036332B CN113036332B CN202110329038.3A CN202110329038A CN113036332B CN 113036332 B CN113036332 B CN 113036332B CN 202110329038 A CN202110329038 A CN 202110329038A CN 113036332 B CN113036332 B CN 113036332B
- Authority
- CN
- China
- Prior art keywords
- dual
- mode
- dielectric resonator
- excitation structure
- feeder line
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
- H01P7/105—Multimode resonators
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention relates to a dual-mode dual-passband dielectric filter capable of generating an out-of-band zero point, which comprises a metal cavity, a first dual-mode dielectric resonator and a second dual-mode dielectric resonator which are cascaded and positioned in the metal cavity, and a first excitation structure and a second excitation structure which are fixed on the bottom wall of the metal cavity and respectively correspond to the first dual-mode dielectric resonator and the second dual-mode dielectric resonator one by one, wherein the first excitation structure is a linear feeder line, the second excitation structure is a zigzag feeder line, the zigzag feeder line comprises a vertical first feeder line, a horizontal second feeder line and a vertical third feeder line which are sequentially connected from bottom to top and positioned in a 45-degree inclined plane of the dielectric resonators, and the third feeder line is arranged close to the second dual-mode dielectric resonator. The dual-mode dual-passband dielectric filter generates a zero point outside a band through a special fold-line-shaped feed structure, and the selectivity of the passband is improved.
Description
Technical Field
The invention belongs to the technical field of wireless communication, relates to a dual-mode dual-passband dielectric filter capable of generating an out-of-band zero point, and particularly relates to a feed structure capable of generating the out-of-band zero point.
Background
A communication system needs to obtain a useful signal while shielding noise, and thus a filter circuit is used in a large amount. The out-of-band transmission zero of the filter passband is beneficial to improving the selectivity of the passband, so how to conveniently and rapidly generate the out-of-band zero is an important index for research in academia and industry.
For the cavity filter circuit, in order to generate a zero point in the amplitude-frequency response, an additional resonant cavity or an additional coupling probe is often required, which finally results in a significant increase in design and processing costs and even in the circuit volume. This is contrary to the trend of low cost and miniaturization of future communication systems.
The dual-passband filter is a research direction for realizing low cost and miniaturization of the filter, is commonly used for processing two paths of parallel signals in an antenna system, and can reduce the number of required filters by half while improving the transmission efficiency.
The applicant filed patent application CN201710736587.6 to the national institute at 24/8/2017, and relates to a dual-passband differential filter based on a miniaturized dual-mode dielectric resonator, wherein a rectangular dielectric resonator with a square cross section is directly placed at the bottom of a metal cavity after being chamfered. Because the symmetrical plane of each group of differential excitation structures is parallel to the symmetrical plane of the other group of differential excitation structures, the structure enables one transmission zero point to be generated between two differential mode pass bands, and improves the isolation between the two pass bands, however, the structure cannot generate more transmission zero points outside the band.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a dual-mode dual-passband dielectric filter capable of generating out-of-band zero, which is beneficial to improving the selectivity of a passband.
In order to achieve the object of the present invention, the dual-mode dual-passband dielectric filter capable of generating an out-of-band zero point provided by the present invention comprises a metal cavity, a first dual-mode dielectric resonator and a second dual-mode dielectric resonator which are cascaded and located in the metal cavity, and a first excitation structure and a second excitation structure which are fixed on the bottom wall of the metal cavity and respectively correspond to the first dual-mode dielectric resonator and the second dual-mode dielectric resonator one to one, wherein the first excitation structure is a linear type feeder line, and the dual-mode dual-passband dielectric filter is characterized in that: the second excitation structure is a zigzag feeder line, the zigzag feeder line comprises a vertical first feeder line, a horizontal second feeder line and a vertical third feeder line which are sequentially connected from bottom to top and are positioned in a plane inclined by 45 degrees of the dielectric resonator, and the third feeder line is arranged close to the second double-mode dielectric resonator.
In addition, the invention also provides a design method of the dual-mode dual-passband dielectric filter capable of generating the out-of-band zero, which comprises the following steps:
And 2, establishing a dielectric cavity model of the dual-mode dual-passband dielectric filter, and adjusting a gap in the middle of the metal cavity to enable the coupling quantity between the two dual-mode dielectric resonators to meet the coupling coefficient obtained by calculation in the step 1.
And 3, loading a first excitation structure in the first double-mode dielectric resonator, and determining design parameters of the first excitation structure according to the port external quality factors required by the first passband and the second passband which are calculated in the step 1, wherein the design parameters comprise the feeder line length and the feed position.
And 4, loading a second excitation structure, and adjusting the cross coupling amount between the first excitation structure and the second excitation structure by adjusting the length of the first feeder in the second excitation structure and the distance between the first feeder and the second double-mode dielectric resonator, so as to determine the position of the out-of-band transmission zero point.
further, the second excitation structure is arranged in a vertical plane where a diagonal line of the second double-mode dielectric resonator is located, the lengths of the first feeder line and the third feeder line and the vertical distances from the first feeder line and the third feeder line to the second double-mode dielectric resonator are adjusted, if the external quality factor meets the design requirement, the design of the double-mode double-passband dielectric filter is completed, otherwise, the vertical distance from the feeder line to the non-corner-cut side of the dielectric resonator is adjusted, and the external quality factor meets the design requirement.
The second excitation structure of the dual-mode dual-passband dielectric filter is a zigzag feeder, and the cross coupling between the two excitation structures is realized through the first feeder of the second excitation structure to generate an out-of-band zero point, so that the selectivity of a passband is improved.
Drawings
The invention will be further described with reference to the accompanying drawings;
FIG. 1 is a three-dimensional view of a dual-mode dual-passband dielectric filter of the present invention that produces an out-of-band zero.
Fig. 2 is a top view of a dual-mode dual-passband dielectric filter of the present invention that may generate an out-of-band zero.
Fig. 3(a) is a graph of port external quality factor versus feeder position extracted by simulation for a feeder length of 26 mm.
Fig. 3(b) is a graph of port external quality factor versus feeder position extracted by simulation for a feeder length of 28 mm.
FIG. 4 is a graph of the amplitude-frequency response of a dual-mode dual-passband dielectric filter that may generate an out-of-band zero in accordance with the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
The dual-mode dual-passband dielectric filter capable of generating the out-of-band zero point comprises a broken line probe for feeding the dual-mode dielectric resonator, is convenient for obtaining the required main coupling amount and cross coupling amount at the same time, and has a simple structure and easy realization. As shown in fig. 1 and fig. 2, the dual-mode dual-passband dielectric filter of this embodiment includes a metal cavity 1, and a first dual-mode dielectric resonator 2 and a second dual-mode dielectric resonator 3 which are located in the metal cavity and are cascaded. The first double-mode dielectric resonator 2 and the second double-mode dielectric resonator 3 are coupled through a gap in the middle of the metal cavity 1. And a first excitation structure 4 and a second excitation structure 5 which are respectively in one-to-one correspondence with the first double-mode dielectric resonator 2 and the second double-mode dielectric resonator 3 are further fixed on the bottom wall of the metal cavity 1.
The double-mode dielectric resonator is obtained by arranging a pair of cut corners for separating orthogonal degenerate modes at diagonal positions of a rectangular dielectric resonator with a square cross section, the bottom of the double-mode dielectric resonator is in direct contact with the bottom surface of the metal cavity, and the top of the double-mode dielectric resonator is spaced from the top of the metal cavity by a certain distance.
The first excitation structure 4 is a linear feeder (length ofl 1) The second excitation structure 5 is a zigzag feeder including vertical first feeders (having a length of 45 ° to the top) sequentially connected from bottom to top in a plane inclined by 45 ° to the dielectric resonatorl 21) A horizontal second feeder (length ofl 22) And a vertical third feeder (of lengthl 23) The third feeder is arranged close to the second double-mode dielectric resonator 3, and the first feeder is arranged at a corner and far away from the second double-mode dielectric resonator 3.
The third feedline of the second excitation structure 5 is used to achieve a main coupling between the port and the second dual mode dielectric resonator 3. The first feed line of the second excitation structure 5 is closer to the first-stage resonator (the first dual-mode dielectric resonator 2), so that the cross coupling between the first excitation structure 4 and the second excitation structure 5 is facilitated. The second feeder is used for connecting the first feeder and the third feeder. The main coupling quantity and the cross coupling quantity can be independently controlled by respectively adjusting the lengths of the third feeder line and the first feeder line and the distance between the feeder line and the intracavity dielectric resonator.
The design method of the dual-mode dual-passband dielectric filter of the embodiment comprises the following steps:
And 2, establishing a dielectric cavity model of the dual-mode dual-passband dielectric filter, and adjusting a gap in the middle of the metal cavity to enable the coupling quantity between the two dual-mode dielectric resonators to meet the coupling coefficient obtained by calculation in the step 1.
And 3, loading a first excitation structure in the first double-mode dielectric resonator, and determining design parameters of the first excitation structure according to the port external quality factors required by the first passband and the second passband which are calculated in the step 1, wherein the design parameters comprise the feeder line length and the feed position.
And 4, loading a second excitation structure, and adjusting the cross coupling amount between the first excitation structure and the second excitation structure by adjusting the length of the first feeder in the second excitation structure and the distance between the first feeder and the second double-mode dielectric resonator, so as to determine the position of the out-of-band transmission zero point.
at the beginning of the design, the second excitation structure 5 is first arranged in the vertical plane of the diagonal of the second dual-mode dielectric resonator 3, i.e. the parameters are not adjustedd，dIs 12.5mm ifgAndlafter the determination, the desired one still cannot be obtained at the same timeQ eAAndQ eBthen by adjusting the parameters at this timedTo perform fine tuning. Because when the feed line is at 0<d<When the horizontal movement is carried out within the range of 12.5mm, the horizontal movement can be independently regulated and controlledQ eBAnd does not affectQ eAA value of (d); when the feed line is at 12.5mm<d<When the horizontal movement is carried out within the range of 25mm, the horizontal movement can be independently regulated and controlledQ eAAnd does not affectQ eBThe value of (c). The above characteristics are advantageous for rapidly obtaining the amount of main coupling between the second excitation structure 5 and the second dual-mode dielectric resonator 3, which is required to construct two pass bands.
As shown in fig. 3(a) and 3(B), when the feeder length is equal to 26mm and 28mm, respectively, the external quality factor of the port corresponding to the two modes (mode a and mode B) extracted by simulation is plotted against the feeder position. The polarization directions of mode a and mode B are shown by the arrows in the inset of fig. 3 (a). After the two dielectric resonators are cascaded, the mode A constructs a first passband, and the mode B constructs a second passband. In the figure, the position of the upper end of the main shaft,lrepresents: feeder length (adapted for selectionl 1Andl 23the value of (d),drepresents: the perpendicular distance from the feed line to the non-chamfered side of the dielectric resonator,grepresents: the perpendicular distance of the feed line to the dielectric resonator. Port external figures of merit for mode A and mode BQ eAAndQ eB) May be considered independently controllable. Specifically, when 0<d<When the thickness of the steel wire is 12.5mm,Q eAthe value of (a) is kept substantially constant,Q eBis as followsdIs increased and decreased (monotonically decreasing). When the diameter is 12.5mm<d<When the thickness is 25mm, the thickness of the film is small,Q eAis as followsdIs increased (monotonically increasing),Q eBthe value of (c) remains substantially unchanged.
Therefore, the conclusion is drawn from the graph of fig. 3: with followinggThe increase of the value of the additive is increased,Q eAandQ eBare all increased; and with the length of the feeder linelThe increase of the value of the additive is increased,Q eAandQ eBare all reduced. At the same time, when the feed line is at 0<d<When the horizontal movement is carried out within the range of 12.5mm, the horizontal movement can be independently regulated and controlledQ eBAnd does not affectQ eAA value of (d); when the feed line is at 12.5mm<d<When the horizontal movement is carried out within the range of 25mm, the horizontal movement can be independently regulated and controlledQ eAAnd does not affectQ eBThe value of (c). The above characteristics are favorable for rapidly obtaining the main required by each of the two pass bandsThe amount of coupling.
The device parameters of the dual-mode dual-passband dielectric filter capable of generating the out-of-band zero in the embodiment are as follows:
the metal cavity is 83mm long, 40mm wide and 32mm high, and the gap width in the middle of the cavity is 13 mm; the length of a side of the dual-mode dielectric resonator D =25mm, the height of the dual-mode dielectric resonator is 20mm, and the length of a side of a corner cut s =8 mm; the length of a feeder line of the first excitation structure 4 is 23mm, and the vertical distance from the feeder line of the first excitation structure 4 to the first double-mode dielectric resonator 2 is 2.9 mm; the lengths of the first feeder line, the second feeder line and the third feeder line of the second excitation structure 5 are respectively 8mm, 10.5mm and 18mm, and the vertical distances from the third feeder line of the second excitation structure 5 to the second double-mode dielectric resonator 3 are respectively 2.3 mm. Based on the values of the parameters, the method is characterized in thatdWhen the thickness is not less than 12.5mm, the thickness can just meet the requirement simultaneouslyQ eAAndQ eBso that the second excitation structure 5 in this embodiment just does not need to pass the parametersdTo perform fine tuning.
As shown in fig. 4, which is a graph of the amplitude-frequency response of the dual-mode dual-passband dielectric filter of the present embodiment, it can be known from the graph that: a total of 3 transmission zeros are generated in the dual-passband filter response, two transmission zeros appearing at the low frequency end (1.44 GHz) and the high frequency end (1.74 GHz) are generated by the zigzag feeder structure provided by the invention, and the transmission zero (1.58 GHz) between the two passbands is generated by equal amplitude and opposite phase of induced currents at the output ends corresponding to the mode A and the mode B.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A dual-mode dual-passband dielectric filter capable of generating an out-of-band zero point comprises a metal cavity (1), a first dual-mode dielectric resonator (2) and a second dual-mode dielectric resonator (3) which are cascaded and positioned in the metal cavity, and a first excitation structure (4) and a second excitation structure (5) which are fixed on the bottom wall of the metal cavity and respectively correspond to the first dual-mode dielectric resonator and the second dual-mode dielectric resonator one by one, wherein the first excitation structure (4) is a linear feeder line, and the dual-mode dual-passband dielectric filter is characterized in that: the second excitation structure (5) is located at one corner of a metal cavity where the second double-mode dielectric resonator (3) is located and close to the first double-mode dielectric resonator (2), the second excitation structure (5) is located in a vertical plane where a diagonal of the metal cavity where the second double-mode dielectric resonator (3) is located, the second excitation structure (5) is a fold-line-shaped feeder line, the fold-line-shaped feeder line comprises a vertical first feeder line, a horizontal second feeder line and a vertical third feeder line, the vertical first feeder line, the horizontal second feeder line and the vertical third feeder line are sequentially connected from bottom to top, the first feeder line is located at the corner and is far away from the second double-mode dielectric resonator (3), and the third feeder line is close to the second double-mode dielectric resonator (3).
2. The dual-mode dual-passband dielectric filter with out-of-band zero generation of claim 1, wherein: the first double-mode dielectric resonator (2) and the second double-mode dielectric resonator (3) are coupled through a gap in the middle of the metal cavity (1).
3. The dual-mode dual-passband dielectric filter with out-of-band zero generation of claim 1, wherein: the double-mode dielectric resonator is obtained by arranging a pair of cut corners for separating orthogonal degenerate modes at diagonal positions of a rectangular dielectric resonator with a square cross section, wherein the bottom of the double-mode dielectric resonator is in direct contact with the bottom surface of the metal cavity, and a gap is formed between the top of the double-mode dielectric resonator and the top of the metal cavity.
4. The dual-mode dual-passband dielectric filter with out-of-band zero generation of claim 1, wherein: the third feeder of the second excitation structure (5) is used for realizing main coupling between the port and the second dual-mode dielectric resonator (3), and the first feeder of the second excitation structure (5) is used for realizing cross coupling between the first excitation structure (4) and the second excitation structure (5).
5. A method for designing a dual-mode dual-passband dielectric filter capable of generating an out-of-band zero as claimed in any one of claims 1 to 4, comprising the steps of:
step 1, calculating respective corresponding low-pass prototype lumped parameters according to performance indexes required by two pass bands of a filter, and respectively calculating port external quality factors and coupling coefficients required by constructing a first pass band generated by a mode A and a second pass band generated by a mode B on the basis;
step 2, establishing a dielectric cavity model of the dual-mode dual-passband dielectric filter in claim 1, and adjusting a gap in the middle of a metal cavity to enable the coupling quantity between two dual-mode dielectric resonators to meet the coupling coefficient calculated in the step 1;
step 3, loading a first excitation structure (4) in the first double-mode dielectric resonator (2), and determining design parameters of the first excitation structure according to port external quality factors required by the first passband and the second passband which are obtained by calculation in the step 1, wherein the design parameters comprise the feeder line length and the feed position;
step 4, loading a second excitation structure (5) in the second double-mode dielectric resonator (3), and adjusting the cross coupling amount between the first excitation structure (4) and the second excitation structure (5) by adjusting the length of a first feeder in the second excitation structure (5) and the distance between the first feeder and the second double-mode dielectric resonator (3), so as to determine the position of an out-of-band transmission zero point;
and 5, adjusting the length of a third feeder in the second excitation structure (5) and the distance between the third feeder and the second dual-mode dielectric resonator (3) to adjust the main coupling amount between the second excitation structure (5) and the second dual-mode dielectric resonator (3) to enable the main coupling amount to meet the external quality factor required by the output end, namely the port external quality factor required by the first passband and the second passband calculated in the step 1.
6. The method of claim 5 for designing a dual-mode dual-passband dielectric filter capable of generating an out-of-band zero, wherein: firstly, a second excitation structure (5) is arranged in a vertical plane where a diagonal line of a second double-mode dielectric resonator (3) is located, the lengths of a first feeder line and a third feeder line and the vertical distances from the first feeder line and the third feeder line to the second double-mode dielectric resonator respectively are adjusted, if an external quality factor meets a design requirement, the design of the double-mode double-passband dielectric filter is completed, otherwise, the vertical distance from the feeder line to the non-chamfer side of the dielectric resonator is adjusted, and the external quality factor meets the design requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110329038.3A CN113036332B (en) | 2021-03-27 | 2021-03-27 | Dual-mode dual-passband dielectric filter capable of generating out-of-band zero |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110329038.3A CN113036332B (en) | 2021-03-27 | 2021-03-27 | Dual-mode dual-passband dielectric filter capable of generating out-of-band zero |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113036332A CN113036332A (en) | 2021-06-25 |
| CN113036332B true CN113036332B (en) | 2022-02-22 |
Family
ID=76473284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110329038.3A Active CN113036332B (en) | 2021-03-27 | 2021-03-27 | Dual-mode dual-passband dielectric filter capable of generating out-of-band zero |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113036332B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001345610A (en) * | 2000-03-30 | 2001-12-14 | Murata Mfg Co Ltd | Dielectric resonator, filter, duplexer, and communications equipment |
| US6351193B1 (en) * | 1998-12-28 | 2002-02-26 | Alcatel | Microwave equalizer with internal amplitude correction |
| CN101626101A (en) * | 2009-08-11 | 2010-01-13 | 京信通信系统（中国）有限公司 | Cavity medium filter and out-band rejection method |
| CN108258373A (en) * | 2018-01-23 | 2018-07-06 | 华南理工大学 | A kind of four mode filter of cavity based on electromagnetism hybrid coupled |
| CN211829143U (en) * | 2020-03-25 | 2020-10-30 | 深圳市大富科技股份有限公司 | Resonant tube assembly and filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206564315U (en) * | 2017-03-03 | 2017-10-17 | 华南理工大学 | A kind of mode filter of cavity four |
| CN107634291B (en) * | 2017-08-24 | 2020-04-07 | 南通大学 | Dual-passband differential filter based on miniaturized dual-mode dielectric resonator |
-
2021
- 2021-03-27 CN CN202110329038.3A patent/CN113036332B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6351193B1 (en) * | 1998-12-28 | 2002-02-26 | Alcatel | Microwave equalizer with internal amplitude correction |
| JP2001345610A (en) * | 2000-03-30 | 2001-12-14 | Murata Mfg Co Ltd | Dielectric resonator, filter, duplexer, and communications equipment |
| CN101626101A (en) * | 2009-08-11 | 2010-01-13 | 京信通信系统（中国）有限公司 | Cavity medium filter and out-band rejection method |
| CN108258373A (en) * | 2018-01-23 | 2018-07-06 | 华南理工大学 | A kind of four mode filter of cavity based on electromagnetism hybrid coupled |
| CN211829143U (en) * | 2020-03-25 | 2020-10-30 | 深圳市大富科技股份有限公司 | Resonant tube assembly and filter |
Non-Patent Citations (3)
| Title |
|---|
| Miniaturized Dual-Band Differential Filter Using Dual-Mode Dielectric Resonator;Jian-Xin Chen等;《IEEE Microwave and Wireless Components Letters》;20180831;第28卷(第8期);全文 * |
| Miniaturized Dual-Band Waveguide Filter Using TM Dielectric-Loaded Dual-Mode Cavities;Valeria Nocella 等;《 IEEE Microwave and Wireless Components Letters》;20160531;第26卷(第5期);全文 * |
| 腔体多模滤波器研究;钱路;《中国优秀硕士学位论文全文数据库》;20200115;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113036332A (en) | 2021-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107086338B (en) | Four mould defects ground formula filter | |
| CN110752424A (en) | Microstrip line band-pass filter | |
| CN109509950A (en) | A kind of compact dual-frequency waveguide filter | |
| JP3531603B2 (en) | High frequency filter, filter device using the same, and electronic device using the same | |
| CN107579317B (en) | Balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator | |
| JPH11346102A (en) | Dielectric resonator device, transmitter-receiver and communication equipment | |
| CN202363564U (en) | Double-frequency band elimination filter | |
| US7495531B2 (en) | Filter and radio communication apparatus using the same | |
| CN113036332B (en) | Dual-mode dual-passband dielectric filter capable of generating out-of-band zero | |
| WO2017203918A1 (en) | Dielectric waveguide filter, high frequency front end circuit, and massive mimo system | |
| CN113036333B (en) | Dual-mode dual-passband dielectric filter power divider capable of generating out-of-band zero | |
| CN102386464B (en) | Double-frequency band elimination filter | |
| CN104681903A (en) | Novel controllable dual-passband filter based on SRR (Split Ring Resonator) and DS-CSRR (dual-Split Complementary Split Ring Resonator) | |
| US6201456B1 (en) | Dielectric filter, dielectric duplexer, and communication device, with non-electrode coupling parts | |
| CN107768782B (en) | Duplexer based on rectangular microstrip structure | |
| CN113036327B (en) | Different-frequency dual-channel filtering balun based on dual-mode dielectric resonator | |
| JP5513545B2 (en) | Band pass filter | |
| CN108428982A (en) | A kind of cavity three-passband filter | |
| JP2009253894A (en) | High-frequency band pass filter | |
| US6809615B2 (en) | Band-pass filter and communication apparatus | |
| CN107768788B (en) | Duplexer based on elliptical microstrip structure | |
| CN106058391A (en) | Novel coupling network based planar CQ diplexer | |
| KR20110113340A (en) | Band pass filter and duplexer based on crlh resonators | |
| CN108565532B (en) | Double-layer planar duplexer of high-integration double-mode rectangular resonator | |
| CN101630769B (en) | Microwave double-frequency bandpass filtering device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| CB02 | Change of applicant information |
Address after: 226019 Jiangsu Province, Nantong City Chongchuan District sik Road No. 9 Applicant after: NANTONG University Address before: 226019 No.9, Siyuan Road, Chongchuan District, Nanjing City, Jiangsu Province Applicant before: NANTONG University |
|
| CB02 | Change of applicant information | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |