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Balun band-pass filter based on slot line and microstrip multimode resonators

A band-pass filter and multi-mode resonance technology, which is applied in the field of microwave passive devices, can solve the problems of small phase deviation of port matching performance, unfavorable promotion and application, and high selectivity, and achieves good port matching characteristics, wide application range, and high selectivity. high sex effect

Inactive Publication Date: 2018-01-12
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In a word, the problem existing in the existing technology is that the balun filter cannot take into account the characteristics of simple structure, high selectivity, good port matching performance and small phase deviation, which is not conducive to the popularization and application in modern wireless communication systems

Method used

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  • Balun band-pass filter based on slot line and microstrip multimode resonators
  • Balun band-pass filter based on slot line and microstrip multimode resonators
  • Balun band-pass filter based on slot line and microstrip multimode resonators

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Embodiment 1

[0040] The three-dimensional structure of the balun bandpass filter based on slot line and microstrip multimode resonator is as follows figure 1 As shown, the top view is as figure 2 As shown, the relevant dimensions and specifications are as follows image 3 shown. The dielectric substrate 7 used has a relative permittivity of 3.55, a thickness of 0.508 mm, and a loss tangent of 0.0027. to combine image 3 , the size parameters of the balun bandpass filter are as follows: W p = 1.18mm, W m1 = 0.6mm, W m2 = 1.2mm, W d = 1.18mm, W s = 0.2mm, L p1 = 6mm, L p2 =13.68mm, L p3 =11mm, L p4 = 1.4mm, L m1 =1.6mm, L m2 =13.4mm, L m3 =2.15mm, L m4 =13.5mm,L m5 =9.4mm, L m6 = 2mm, L s1 =11.8mm, L s2 =3.92mm,L s3 = 8.6 mm, g = 0.1 mm. The total area of ​​the balun bandpass filter including the 50 ohm microstrip conduction band is 33.6×34mm 2 , the corresponding guide wavelength size is 0.52λ g ×0.53λ g , where λ g is the guided wavelength corresponding to the cen...

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Abstract

The invention discloses a balun band-pass filter based on a slot line and microstrip multimode resonators. The balun band-pass filter comprises a rectangular dielectric substrate (7) provided with a metal grounding plate (8) on the lower surface, wherein the upper surface of the dielectric substrate (1) is provided with an input port feeder (1), a first output port feeder (2) and a second output port feeder (3); an input end of the input port feeder (1) is positioned at a midpoint of a narrow side of the dielectric substrate (7), an output end of the first output port feeder (2) is positionedon a broadside of the dielectric substrate (7), and an output end of the second output port feeder (3) is positioned on another broadside of the dielectric substrate (7); and a short-circuit half-wavelength resonator (4) and a branch-loaded resonator (5) are arranged between the input port feeder (1) and the first output port feeder (2), and a continuous bending type half-wavelength slot line (6)is etched on the metal grounding plate (8). The balun band-pass filter disclosed by the invention has the advantages of high selectivity, good port matching feature and small phase deviation.

Description

technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to a balun bandpass filter based on slot lines and microstrip multi-mode resonators, which has simple structure, high selectivity, good port matching characteristics and small phase deviation. Background technique [0002] In recent years, modern wireless communication systems have flourished, increasing the demand for miniaturized, low-cost, multifunctional microwave devices. Among them, the balun filter, as a multifunctional device integrating signal filtering and balanced and unbalanced signal conversion functions, has received more and more attention. A high-performance balun filter can not only effectively reduce the size of the system, but also simplify the complexity of system design, thereby further realizing the low-cost, high-performance, and miniaturized design of the wireless communication system. [0003] Document 1 (J.X.Xu and X.Y.Zhang, "Compact LTC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203H01P5/10
Inventor 王雪道徐艳卉王建朋
Owner NANJING UNIV OF SCI & TECH
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