Three-passband power dividing filter with high frequency selectivity

Abstract

The invention discloses a three-passband power dividing filter with high frequency selectivity. The three-passband power dividing filter comprises a dielectric substrate, a metal grounding plate is arranged on the lower surface of the dielectric substrate, and an input port feeder line, a first output feeder line and a second output feeder line are arranged on the upper surface of the dielectric substrate. The input port feeder line, the first output feeder line and the second output feeder line are all located on the same side of the central axis of the dielectric substrate, and one end of the first output feeder line is connected with one end of the second output feeder line; a first resonance unit, a second resonance unit, a third resonance unit and a fourth resonance unit are sequentially coupled and connected between the input port feeder line and the first output feeder line as well as between the input port feeder line and the second output feeder line, and the four resonance units have the same structure and respectively comprise a band-pass resonator and two band-stop resonators with different sizes; and a port isolation resistor is arranged between the first output feeder line and the second output feeder line. The three-passband power dividing filter has high 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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