A three-pass band power divider filter with high frequency selectivity

Abstract

The invention discloses a three-pass band power dividing filter with high frequency selectivity, which comprises a dielectric substrate, a metal grounding plate is arranged on the lower surface of the dielectric substrate, and an input port feeder, a first output feeder and a second feeder are arranged on the upper surface of the dielectric substrate. Two output feeders, the input port feeder, the first output feeder and the second output feeder are all located on the same side of the central axis of the dielectric substrate, one end of the first output feeder is connected to one end of the second output feeder; the input port feeder and the first output feeder , The connection between the second output feeder line is sequentially coupled with the first resonant unit, the second resonant unit, the third resonant unit and the fourth resonant unit. The four resonant units have the same structure, and each includes a bandpass resonator and two Band-stop resonators with different sizes; port isolation resistors are provided between the first output feeder and the second output feeder. The three-pass band power dividing filter has good frequency selectivity, out-of-band harmonic suppression, power distribution characteristics and filtering characteristics.

Description

technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to a three-pass band power dividing filter with high frequency selectivity. Background technique [0002] In modern wireless communication systems, power dividers and filters are important RF front-end passive components. In order to realize power distribution and filtering functions at the same time, they are often designed in the circuit in a cascaded manner. In this way, not only the circuit The volume will increase, and the circuit performance will decrease. Therefore, in order to reduce the size of the circuit and improve the performance of the circuit, in recent years, the research on the power divider with filter response function, that is, the filter power divider (Filtering Power Diver, FPD), has been explored, and the specified power distribution / combination and frequency can be realized at the same time. Optional features. In addition, with the continu...

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Problems solved by technology

[0003] Document 1 [K.J.Song, M.Y.Fan, and F.Zhang, "Compact Triple-Band Power DividerIntegrated Bandpass-Filtering Response Using Short-Circuited SIRs," IEEE Trans.Compon.Packag.Manufact.Technol., vol.7, no. 7, July.2017] By using coupled short-circuit ladder impedance resonators and half-wavelength resonators to realize the three-pass band power division filter response, the filter has obtained a good three-pass band filtering effect, but due to the complex circuit structure and port isolation The degree and out-of-band rejection are not ideal, and it is difficult to obtain a good application

[0004] Literature 2 [C.-F.Chen, T.-Y.Huang, and R.-B.Wu, "Novel compact net-typeresonators and their applications to microstrip bandpass filters," IEEETrans.Microw.Theory Techn., vol. 54, no.2, pp.755-762, Feb.2006] By using a mesh three-mode resonator, a multi-passband microstrip filter is realized simply and efficiently without significantly increasing the circuit size , however, due to the limitation of the degree of freedom of design parameters, it is difficult to realize the design requirements for all passbands at the same time, which increases the difficulty of design realization

[0005] Document 3 [R.Gómez-Garcia, R.Loeches-Sanchez, D.Psychogiou, and D.Peroulis, "Single / multi-band Wilkinson-type power dividers with embedded transversalfiltering sections and application to channelized filters," IEEETrans.Circuits Syst .I, Reg.Papers, vol.62, no.6, pp.1518-1527, Jun.2015.] proposed a new type of single / multiple passband Wilkinson power splitter with inherent filtering capability, this The method has a certain generality, but its circuit volume is large, and the port isolation is not good

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