Three-pass band filter
A filter and three-pass band technology, which is applied in the field of compact three-pass band filters, can solve the problems of complex filter structure, difficult design and large volume, and achieves improved space utilization, simple structure and compact circuit structure. Effect
Inactive Publication Date: 2015-08-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0004] There are many ways to realize the three-pass band filter. At present, the more common structures and their corresponding characteristics are as follows: (1) The three-pass band filter structure is realized by connecting two or three sets of resonators in parallel, and the common input and output ports are used. , each group of resonators produces one passband or two passbands, the disadvantage of this filter structure is its complexity and large size; (2) by introducing transmission zeros in single-passband or double-passband filters to achieve three-pass With filter, but the filter also has the problem of complex structure and difficult design
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[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0020] like figure 1 As shown, the planar microstrip compact three-pass band filter in this embodiment includes a dielectric substrate 1 provided with grounding vias 11, a main line positioned on the upper surface of the dielectric substrate 1, and a metal layer positioned on the lower surface of the dielectric substrate. stratum 3. The main line is formed by cascading two axisymmetrically distributed quarter-wavelength stepped impedance resonators 21 and 21 ′, and the two stepped impedance resonators 21 and 21 ′ are connected through the grounding hole 11 to achieve grounding. The ladder impedan...
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The invention discloses a three-pass-band filter which is applied to the field of communication. The three-pass-band filter comprises a medium substrate provided with grounding through holes, a main circuit located on the upper surface of the medium substrate and a metal grounding layer located on the lower surface of the medium substrate. The main circuit is formed by the concatenation of two quarter-wave stepped impedance resonators which are distributed in axial symmetry, the two quarter-wave stepped impedance resonators are connected through the grounding through holes, the two quarter-wave stepped impedance resonators are respectively connected with an input / output feeder line, each quarter-wave stepped impedance resonator comprises three transmission lines connected end to end, and an open circuit transmission line is loaded on the middle section of each transmission line located in the middle. The three-pass-band filter has the advantages that central frequency and bandwidth are easy to control, the selectivity of the frequency is high, separating strength among pass-bands is high, and the size is small.
Description
technical field [0001] The invention belongs to the technical field of microwave communication, and in particular relates to a compact three-pass band filter with a planar microstrip structure. Background technique [0002] With the rapid development of multi-band and multi-standard wireless communication systems, higher requirements are put forward for the high frequency selectivity and miniaturization of multi-band bandpass filters. [0003] To realize the screening of three-band signals, the traditional method is to use three single-pass-band filters to screen each pass-band signal respectively. This method is simple and feasible, but the integration level is not enough to meet the needs of small-sized, light-weight wireless communications. Quantified development requirements. Therefore, designing a "highly selective, miniaturized" three-pass band filter that can be effectively integrated is an important topic at present. [0004] There are many ways to realize the thre...
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IPC IPC(8): H01P1/203
Inventor 尉旭波乐国韬袁双林廖家轩徐自强汪澎金龙田忠石玉
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA