In-phase power division filter based on slot line and microstrip

Abstract

An in-phase power division filter based on a slot line and a microstrip, disclosed by the present invention, comprises a rectangular dielectric substrate (4), a metal grounding plate (9) is arranged on the lower surface of the rectangular dielectric substrate (4), and an input port feeder line (1), a first output port feeder line (2) and a second output port feeder line (3) which are symmetricallydistributed, are arranged on the upper surface of the dielectric substrate (4). A T-shaped microstrip line (10) is positioned in the middle of the dielectric substrate, the first microstrip line (20)and the second microstrip line (30) are respectively connected with the first output port feeder line (2) and the second output port feeder line (3), and the continuous right-angle bent slot lines (6) and (7) and circular fan slot lines (8) are etched on the metal grounding plate (9). The isolation resistors (5) are arranged below the joints of the circular fan slot lines (8), and the metal columns are distributed at the two ends of each isolation resistor (5) respectively. The slot line in-phase power dividing filter of the present invention is high in selectivity, good in port matching characteristic and small in phase deviation.

Description

technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to an in-phase power division filter based on slot lines and microstrips. 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 non-inverting power divider filter, as a multifunctional device integrating signal filtering and balanced and unbalanced signal conversion functions, has attracted more and more attention. A high-performance non-inverting power divider 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 LTCC balun with bandpass response based on marchand balun," IEEE Microw Wirel...

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[0003] Document 1 (J.X.Xu and X.Y.Zhang, "Compact LTCC balun with bandpass response based on marchand balun," IEEE Microw Wireless Compon. Lett., vol.26, no.7, pp.493-495, Jul.2016.) based on low temperature Co-fired ceramic technology (LTCC), using Marchand balun to design a miniaturized balun filter, however, the design complexity of this process is high, and the insertion loss is large

[0004] Literature 2 (G.-Q.Zhang, J.-X.Chen, J.Shi, H.Tang, H.Chu, and Z.-H.Bao, "Design of multilayer balun filter with independently controllable dual passbands," IEEE Microw .Wireless Compon.Lett.,vol.25,no.1,pp.10-12,Jan.2015.) Based on the multi-layer PCB technology, a cross-grooved chip resonator is used to design a dual-pass band Independently controlled balun filter, however, the in-band matching characteristics of the balun filter are not effective

[0005] Document 3 (J.P.Wang, F.Huang, L.Zhu, C.T.Cai, and W.Wu, "Study of a new planar-type balun topology for application in the design of balun bandpass filters," IEEE Trans.Microw.Theory Techn ., vol.43, no.24, pp.2824-2832, Sep.2016.) Two balun filters were designed using the half-wavelength field distribution characteristics, but these two balun filters required two Or more than two multimode resonators form a filter response, which undoubtedly increases the design complexity

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