Dual-passband balance power division filter adopting double-layer circular patches

Abstract

The invention discloses a dual-passband balanced power dividing filter adopting double-layer circular patches. The filter comprises an upper dielectric substrate and a lower dielectric substrate, and is characterized in that a metal grounding plate is arranged between the upper dielectric substrate and the lower dielectric substrate; the top layer circular patch, a first input port feeder line, a second input port feeder line, a top layer first isolation port and a top layer second isolation port are arranged on the upper surface of the upper layer dielectric substrate; the lower surface of the lower dielectric substrate is provided with the bottom circular patch, a first output port feeder line, a second output port feeder line, a third output port feeder line and a fourth output port feeder line; and the metal grounding plate is provided with a slot line which is used for transmitting the resonance mode of the top circular patch to the bottom circular patch. The dual-passband balanced power dividing filter has very small size and more perfect functions, can be realized on a single PCB (Printed Circuit Board), is convenient to process and integrate, and has high common-mode rejection performance.

Description

technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to a dual-frequency balanced power division filter. Background technique [0002] With the development of modern communication systems, microwave devices have been widely used. Among them, compared with traditional single-ended devices, balanced components have the advantages of strong anti-interference ability and high reliability, and are one of the most critical devices. Balanced passive components such as balanced bandpass filters and balanced power splitters are also widely used, but simple cascading of the two will result in too large a volume, and balanced power splitters emerge as the times require, while dual-passband balanced Due to the characteristic of transmitting signals in two passbands, the power divider filter has received extensive attention. At the same time, compared with traditional microstrip lines and substrate integrated waveguide (SIW) st...

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Problems solved by technology

However, the design of this dual-passband balanced power divider filter is relatively complicated, and the return loss is poor, and the isolation between output ports is not ideal.

[0004] Document 2 [P.L.Chi, Y.M.Chen, and T.Yang, "Single-layer dual-band balanced substrate-integrated waveguide filtering power divider for 5G millimeter-waveapplications," IEEE Microw.Wireless Compon. Lett., vol.30, no. 6, pp.585-588, June.2020.] By properly designing the differential mode and common mode of the three cavities of the SIW to form a three-pole passband, a dual-passband power division filter with balanced performance is proposed, however , the problems of large insertion loss and large size limit the wide application of this balanced power dividing filter

[0005] Document 3 [Q.Liu, J.Wang, L.Zhu, G.Zhang and W.Wu, "Design of a new balanced-to-balanced filtering power divider based on square patch resonator," IEEETrans.Microw.Theory Techn. ,vol.66,no.12,pp.5280–5289,Dec.2018.] By using a square patch resonator, starting from the field distribution of the degenerate mode on the square patch resonator, successfully designed a Balanced power divider filter with square patch resonator, but still unable to achieve dual frequency response

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