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Tapped feed dual-mode Balun band-pass filter

A band-pass filter and feeder technology, applied in the field of microwave passive devices, can solve the problems that the balun filter cannot take into account the simple structure, unfavorable wireless communication system popularization and application, good selectivity, etc., and achieves easy processing and integration, good amplitude and phase balance characteristics, the effect of good selectivity

Inactive Publication Date: 2016-02-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In a word, the problem existing in the prior art is that the balun filter cannot take into account simple structure, low loss, good selectivity and good port matching characteristics, which is not conducive to popularization and application in modern wireless communication systems

Method used

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  • Tapped feed dual-mode Balun band-pass filter
  • Tapped feed dual-mode Balun band-pass filter
  • Tapped feed dual-mode Balun band-pass filter

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Embodiment 1

[0041] The structure of the tap-fed dual-mode balun bandpass filter 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 6 used has a relative permittivity of 3.55, a thickness of 0.508 mm, and a loss tangent of 0.0027. combine image 3 , the size parameters of the balun filter are as follows: W p1 = 1.13mm, W p2 = 1.13mm, W 1 = 0.4mm, W 11 = 0.4mm, W 2 = 0.4mm, W 21 = 0.4mm, W 4 = 0.4mm, W 42 = 0.8mm, L 1 =32.7mm,L 10 = 2mm, L 11 = 4mm, L 2 =13.1mm,L 3 =11.4mm,L 31 = 4mm, L 32 = 4mm, L 5 =1.85mm, L 51 =15.1mm,L 52 =14.6mm,P 1 = 1.1mm, P 2 = 1.6 mm, g = 0.2 mm. The total area of ​​the balanced filter excluding the conduction band of the 50 ohm microstrip line is 10.465×35.7mm 2 , the corresponding guide wavelength size is 0.16λ g ×0.55λ g , where λ g is the guided wavelength corresponding to the central frequency of the passband.

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Abstract

The invention discloses a tapped feed dual-mode Balun band-pass filter which comprises a rectangular medium baseplate (6) of which the lower surface is equipped with a metal grounding plate (7), wherein an input port feeder line (1), a first output port feeder line (2) and a second output porter feeder line (3) are disposed on the upper surface of the rectangular medium baseplate (6), the input porter feeder line (1) is close to one wide edge of the rectangular medium baseplate (6), the first output port feeder line (2) and the second output port feeder line (3) are close to the other wide edge of the rectangular medium baseplate (6) and are arranged successively along the length direction of the rectangular medium baseplate (6), a first E-type resonator (4) is disposed between the first output port feeder line (2) and the input port feeder line (1), and a second E-type resonator (5) is disposed between the second output port feeder line (3) and the input port feeder line (1). The tapped feed dual-mode Balun band-pass filter disclosed by the invention is simple in structure, low in losses and good in selectivity and port matching.

Description

technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to a tap-feed dual-mode balun bandpass filter with simple structure, low loss, good selectivity and good port matching characteristics. Background technique [0002] With the development of Modular Building Block (MBB) and Monolithic Microwave Integrated Circuit (MMIC), low cost, high integration, and miniaturization have become very important considerations in the integrated design of modern wireless communication systems. As a key device, the balun is widely used in circuits such as balanced mixers, push-pull amplifiers and antennas. To obtain filtering characteristics, baluns often need to be combined with filters. The traditional RF front-end circuit adopts the structure combining the balun and the filter, which increases the volume of the front-end equipment and increases the power loss at the same time. [0003] Therefore, integrating the functions of the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
Inventor 王雪道刘倩文王建朋黄烽
Owner NANJING UNIV OF SCI & TECH
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