CN101752635A - Dual-band band-pass filter with controllable band width - Google Patents
Dual-band band-pass filter with controllable band width Download PDFInfo
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- CN101752635A CN101752635A CN201010045836A CN201010045836A CN101752635A CN 101752635 A CN101752635 A CN 101752635A CN 201010045836 A CN201010045836 A CN 201010045836A CN 201010045836 A CN201010045836 A CN 201010045836A CN 101752635 A CN101752635 A CN 101752635A
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Abstract
The invention discloses a dual-band band-pass filter with controllable band width, which consists of dual-band resonators and a dual-band admittance converter. The dual-band band-pass filter is formed by cascading an input port (1), an output port (7), two dual-band resonators and a dual-band admittance converter (14), wherein each dual-band resonator is formed by connecting a uniform impedance resonator (2 or 5) and a step impedance resonator (3 or 6) in parallel; and the dual-band admittance converter (14) is formed by a microstrip line of which the middle part is loaded with open circuit branches. The dual-band band-pass filter adopts a new structure to solve the problems of design difficulty and regulation difficulty on the admittance converter of the conventional dual-band filter without the addition of design difficulty, and has a compact structure and simple design. In addition, the structure of the dual-band band-pass filter is easy to process and manufacture in practice. The dual-band band-pass filter with the controllable band width is suitable for a microwave integrated circuit.
Description
Technical field
The present invention relates to a kind of controlled double-frequency bandpass filtering device of bandwidth that adopts novel two-band admittance inverter and two-band resonator to constitute, belong to the microwave transmission device technical field.
Background technology
The double frequency microwave filter is the important devices of multi-frequency radio communication system front end, and the method for traditional design two-band filter is two different band pass filter parallel connections, or a broadband band-pass filter is connected with a narrow-band band-elimination filter.The double-frequency bandpass filtering device that these two kinds of methods realize, owing to comprise two different filters in the circuit, so volume ratio is bigger; Adopt step electric impedance resonator formula two-band filter, utilize the fundamental frequency of resonator and two passbands that second harmonic is used the coupling formation filter between resonator respectively, in a filter, realized two passbands.Though it is little that this two-band filter has a volume, the manageable characteristic in frequency band position, two band bandwidths of filter are difficult to control simultaneously.Can realize control based on the double frequency band-pass filter of transmission line formula to filter bandwidht and frequency band position, the filter of this form is inverted converter by two-band resonator and two-band usually and is constituted, but the two-band admittance inverter that conventional method realizes is the big adjustment of need making comparisons being connected with the two-band resonator, therefore adjusts relatively difficulty.
Summary of the invention
The objective of the invention is, in order to solve big and two shortcomings that band bandwidth is difficult to control simultaneously of traditional double frequency band filter volume, propose a kind of structure of new two-band admittance inverter, the parameter of needed admittance inverter can be by directly calculating.And the two-band filter of making is easy to regulate the equal may command of centre frequency and bandwidth.
Technical scheme of the present invention is that two-band admittance inverter of cascade constitutes new double-frequency bandpass filtering device between two two-band resonators.
As shown in Figure 2, double-frequency bandpass filtering device of the present invention is formed by input port (1), output port (7), two two-band resonators and a two-band admittance inverter (4) cascade.Two two-band resonators are respectively: by the two-band resonator of uniform impedance open circuit resonator (2) and stepped impedance open circuit resonator (3) formation; Two-band resonator by uniform impedance open circuit resonator (5) and stepped impedance open circuit resonator (6) formation.Two-band admittance inverter (4) is made of the microstrip line that a middle part loads the open circuit minor matters, and admittance inverter is a kind of device that connects resonator, utilizes admittance inverter that two resonators are connected to form filter.
The two-band resonator that is made of two open circuit resonators can produce resonance in specified frequency respectively; A kind of novel two-band admittance inverter structure, this structure can meet design requirement simultaneously at two frequency preset points.
In the process that the control table of bandwidth designs now, the classical single-frequency Design of Filter theory of utilization in design, so the control logical change resonator minor matters and the double frequency admittance inverter of bandwidth controlled simultaneously in the patent of the present invention.
Filter Design is given passband width, and under the situation of arbitrarily given passband width, the resonator of double frequency-band and the admittance inverter of two-band all are the models that can adopt patent of the present invention, according to this design objective with calculating.
The present invention's beneficial effect compared with prior art is, the present invention is not increasing under circuit area and the processed complex degree prerequisite, adopt the microstrip line that loads the open circuit resonator to constitute novel two-band admittance inverter, make the two-band admittance inverter can satisfy the designing requirement of two frequency ranges simultaneously.And novel admittance inverter combines with circuit and need not to regulate, and compact conformation is convenient to use in microwave integrated circuit.
The present invention is applicable to microwave integrated circuit.
Description of drawings
Fig. 1 is the structural representation of novel two-band admittance inverter;
Fig. 2 is the schematic layout pattern that adopts the two-band filter of novel admittance inverter;
Among the figure: (1) is input port; (7) be output port; (2) be uniform impedance open circuit resonator; (3) be stepped impedance open circuit resonator; (5) be uniform impedance open circuit resonator; (6) be stepped impedance open circuit resonator.(2) and (3), (5) and (6) constitute the two-band resonator respectively; (4) be the two-band admittance inverter.
Embodiment
Double-frequency bandpass filtering device novel admittance inverter of cascade between two two-band resonators that this example is implemented has constituted new two-band filter construction.As shown in Figure 2, signal is imported from input port (1), through the two-band resonator that constitutes by uniform impedance open circuit resonator (2) and stepped impedance open circuit resonator (3), via two-band admittance inverter (4), be coupled to the two-band resonator device that constitutes by uniform impedance open circuit resonator (5) and stepped impedance open circuit resonator (6), then by output port (7) output.Adopt the two-band admittance inverter of new structure to make that design is simpler, regulates conveniently, and can in passband, not produce extra resonance peak interference.In concrete enforcement, two frequency ranges (2.4GHz and 5.2GHz) that are operated in WLAN (wireless local area network) of this example design, owing to used for reference the mentality of designing of conventional filter in the design process, so whole filter shows good two-band bandpass characteristics.The centre frequency of first passband of filter is 2.4GHz, inserts loss to be-0.19dB; The centre frequency of second passband is 5.2GHz, inserts loss to be-0.88dB.Simultaneously formed three transmission zeros in the stopband of filter, they lay respectively at 2.1GHz, 4.2GHz, 5.6GHz..
Claims (4)
1. double-frequency bandpass filtering device that bandwidth is controlled, form by input port, output port, two-band resonator and admittance inverter, it is characterized in that described double-frequency bandpass filtering device is formed by input port, output port, two two-band resonators and the cascade of a two-band admittance inverter.
2. the controlled double-frequency bandpass filtering device of a kind of bandwidth according to claim 1 is characterized in that, described two-band resonator is formed in parallel by a uniform impedance resonator and a step electric impedance resonator.
3. the controlled double-frequency bandpass filtering device of a kind of bandwidth according to claim 1 is characterized in that, described two-band admittance inverter is made of the microstrip line that a middle part loads the open circuit minor matters.
4. the controlled double-frequency bandpass filtering device of a kind of bandwidth according to claim 1 is characterized in that, the described two-band resonator that is made of two open circuit resonators can be respectively produces resonance in the frequency range of appointment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010045836A CN101752635A (en) | 2010-01-14 | 2010-01-14 | Dual-band band-pass filter with controllable band width |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010045836A CN101752635A (en) | 2010-01-14 | 2010-01-14 | Dual-band band-pass filter with controllable band width |
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| CN101752635A true CN101752635A (en) | 2010-06-23 |
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| CN201010045836A Pending CN101752635A (en) | 2010-01-14 | 2010-01-14 | Dual-band band-pass filter with controllable band width |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361110A (en) * | 2011-10-08 | 2012-02-22 | 上海大学 | Small-sized double-module double-frequency micro-strip filter |
| CN104577273A (en) * | 2014-12-19 | 2015-04-29 | 华南理工大学 | Plane low-pass band-pass dual-frequency filter |
| CN104810576A (en) * | 2015-03-31 | 2015-07-29 | 中国电子科技集团公司第五十五研究所 | Millimeter wave broadband 0-pi phase shifter |
| CN103606725B (en) * | 2013-11-25 | 2015-08-05 | 中国电子科技集团公司第四十一研究所 | A kind of open circuit stepped impedance low pass filter in parallel |
| CN106876845A (en) * | 2015-12-13 | 2017-06-20 | 哈尔滨飞羽科技有限公司 | The three trap bandpass filters based on step electric impedance resonator and open circuit minor matters |
| CN107196024A (en) * | 2017-04-15 | 2017-09-22 | 深圳市景程信息科技有限公司 | Broadband band-pass filter with broadband Out-of-band rejection |
| CN107946710A (en) * | 2017-12-20 | 2018-04-20 | 杭州电子科技大学 | Ultra-compact double-frequency bandpass filtering device based on RQMSIW |
| CN109411862A (en) * | 2018-10-25 | 2019-03-01 | 成都会讯科技有限公司 | The double detail parallel resonators of asymmetry open circuit and bandpass filter and design method |
| CN110364791A (en) * | 2018-04-09 | 2019-10-22 | 西安邮电大学 | A kind of Ku wave band compact bandpass filter based on LCP |
| CN112865716A (en) * | 2020-12-31 | 2021-05-28 | 四川天巡半导体科技有限责任公司 | Broadband high-efficiency power device based on multi-step branch matching network |
| CN113972456A (en) * | 2021-12-22 | 2022-01-25 | 南京典格通信科技有限公司 | Three-order wide stop band 5G microstrip filter |
-
2010
- 2010-01-14 CN CN201010045836A patent/CN101752635A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| LIN-CHUAN TSAI AND CHING-WEN HSUE: "Dual-Band Bandpass Filters Using Equal-Length Coupled-Serial-Shunted Lines and Z-Transform Technique", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
| XIU YIN ZHANG ET AL: "Dual-Band Bandpass Filters Using Stub-Loaded Resonators", 《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》 * |
| 官雪辉: "无线通信微波双频段带通滤波器研究", 《上海大学博士学位论文》 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361110A (en) * | 2011-10-08 | 2012-02-22 | 上海大学 | Small-sized double-module double-frequency micro-strip filter |
| CN102361110B (en) * | 2011-10-08 | 2013-09-04 | 上海大学 | Small-sized double-module double-frequency micro-strip filter |
| CN103606725B (en) * | 2013-11-25 | 2015-08-05 | 中国电子科技集团公司第四十一研究所 | A kind of open circuit stepped impedance low pass filter in parallel |
| CN104577273A (en) * | 2014-12-19 | 2015-04-29 | 华南理工大学 | Plane low-pass band-pass dual-frequency filter |
| CN104810576A (en) * | 2015-03-31 | 2015-07-29 | 中国电子科技集团公司第五十五研究所 | Millimeter wave broadband 0-pi phase shifter |
| CN106876845A (en) * | 2015-12-13 | 2017-06-20 | 哈尔滨飞羽科技有限公司 | The three trap bandpass filters based on step electric impedance resonator and open circuit minor matters |
| CN107196024A (en) * | 2017-04-15 | 2017-09-22 | 深圳市景程信息科技有限公司 | Broadband band-pass filter with broadband Out-of-band rejection |
| CN107946710A (en) * | 2017-12-20 | 2018-04-20 | 杭州电子科技大学 | Ultra-compact double-frequency bandpass filtering device based on RQMSIW |
| CN107946710B (en) * | 2017-12-20 | 2020-05-05 | 杭州电子科技大学 | RQMSIW-based ultra-compact dual-band-pass filter |
| CN110364791A (en) * | 2018-04-09 | 2019-10-22 | 西安邮电大学 | A kind of Ku wave band compact bandpass filter based on LCP |
| CN109411862A (en) * | 2018-10-25 | 2019-03-01 | 成都会讯科技有限公司 | The double detail parallel resonators of asymmetry open circuit and bandpass filter and design method |
| CN112865716A (en) * | 2020-12-31 | 2021-05-28 | 四川天巡半导体科技有限责任公司 | Broadband high-efficiency power device based on multi-step branch matching network |
| CN113972456A (en) * | 2021-12-22 | 2022-01-25 | 南京典格通信科技有限公司 | Three-order wide stop band 5G microstrip filter |
| CN113972456B (en) * | 2021-12-22 | 2022-04-19 | 南京典格通信科技有限公司 | Three-order wide stop band 5G microstrip filter |
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Application publication date: 20100623 |