A Highly Selective Dual-Passband Power Divider Filter

Abstract

The invention discloses a high-selectivity double-passband power dividing filter, comprising a polygonal dielectric substrate provided with a metal grounding plate on a lower surface thereof. An inputport feeding line, a first output port feeding line, a second output port feeding line, a first output coupling line and a second output coupling line are arranged on the upper surface of the polygonal dielectric substrate. The first output port feeding line and the second output port feeding line are close to two vertically-adjacent edges of the polygonal dielectric substrate. A branch-loading type multi-mode resonator is arranged between the first output port feeding line and the second output port feeding line. An isolation resistor is arranged between the first output coupling line and the second output coupling line. The high-selectivity double-passband power split filter is compact in structure, low in loss, high in selectivity, good in isolation and good in out-of-band rejection performance.

Description

technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to a high-selectivity dual-pass band power divider filter with multiple characteristics such as compact structure, low loss, high selectivity, good isolation, and good out-of-band suppression. . Background technique [0002] In recent years, with the development of Modular Building Block (MBB) and Monolithic Microwave Integrated Circuit (MMIC), low cost, high integration, and miniaturization have become very important in the integrated design of modern wireless communication systems. important consideration. Usually, the RF front-end circuit is composed of different devices, such as filters, power splitters, etc., and designing these devices separately will undoubtedly increase the physical size of the front-end circuit. The most efficient way to size. As a functionally integrated passive component, the power divider filter has attracted extensive attention from...

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Problems solved by technology

[0003] Document 1 [C.F.Chen, T.Y.Huang, T.M.Shen and R.B.Wu, "Design of Miniaturized Filtering Power Dividers for System-in-a-Package," IEEE Transactions on Components, Packaging and Manufacturing Technology, vol.3, no.10, pp. 1663-1672, Oct.2013] A Wilkinson power divider with Chebyshev and quasi-elliptic bandpass responses was implemented by utilizing mesh resonators, however, in order to improve the in-band isolation characteristics of the higher order responses , this kind of power dividing filter needs multi-layer isolation resistors to realize, which increases the difficulty of realizing the cross-coupling topology

[0004] Document 2 [X.Wang, J.Wang, G.Zhang, J.S.Hong and W.Wu, "Dual-wideband filtering power divider with good isolation and high selectivity," IEEE Microw.Wireless Compon. Lett., vol.27, no. 12, pp.1071-1073, Dec.2017] proposed a dual-passband power division filter with wide stopband performance, however, the problems of large insertion loss and poor selectivity limit the wide application of the power division filter application

[0005] Document 3 [S.S.Gao, S.Sun and S.Xiao, "A Novel Wideband Bandpass PowerDivider With Harmonic-Suppressed Ring Resonator," IEEE Microwave and Wireless Components Letters, vol.23, no.3, pp.119-121, March 2013 ] By using a ring resonator, a high-selectivity broadband power divider filter is designed, but its in-band isolation level is not good

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