A New Type of High Performance Dual-Passband Four Power Division Filter

Abstract

The invention discloses a novel high-performance dual-pass band four-power dividing filter, comprising a rectangular dielectric substrate with a metal ground plane on a lower surface, wherein an inputport feed line, a first output port feed line, a second output port feed line, a third output port feed line and a fourth output port feed line are arranged on an upper surface of the rectangular dielectric substrate; a first ring branch loading type multimode resonator is arranged between the second output port feed line and the input port feed line, and a second ring branch loading type multimode resonator is arranged between the fourth output port feed line and the input port feed line; a first isolation resistor is provided between the first coupling input line and the second coupling input line, a second isolation resistor is provided between the first coupling output line and the second coupling output line, and a third isolation resistor is provided between the third coupling output line and the fourth coupling output line. The invention has the advantages of compact structure, low loss, high selectivity, good isolation and good out-of-band rejection performance.

Description

technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to a novel high-performance dual-passband four-power division filter. 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 academic researchers. [0003] Literature 1 [F.J.Chen, L.S.Wu, L.F.Qiu, and J.F.Mao, "A four-way microstripfiltering power d...

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Problems solved by technology

[0003] Literature 1 [F.J.Chen, L.S.Wu, L.F.Qiu, and J.F.Mao, "A four-way microstripfiltering power divider with frequency-dependent couplings," IEEETrans.Microw.Theory Techn., vol.63, no.10, pp.3494 –3504,Oct.2015.] proposed a microstrip line-type four-power divider filter, however, the isolation level in the band is not good, and the circuit size is too large

[0004] Document 2 [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] implemented a Wilkinson power divider with Chebyshev and quasi-elliptic bandpass responses, however, in order to improve the in-band isolation characteristics of high-order responses, this kind of power divider filter Multi-layer isolation resistors are required to achieve, which increases the difficulty of implementing cross-coupling topology

[0005] Document 3 [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, however, the problems of large insertion loss and poor selectivity limit the wide application of the power division filter

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