Balanced non-reflection band-pass filter

A band-pass filter, filter technology, applied in the direction of waveguide-type devices, circuits, electrical components, etc., can solve the problem of excessive design size, limited non-reflection bandwidth, and no detailed discussion of the band-pass part of the differential mode band-pass filter. Bandwidth relationship and other issues, to achieve the effect of compact circuit size, easy design parameter optimization, and low in-band insertion loss

CN114597617APending Publication Date: 2022-06-07NANTONG UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-06-07

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Abstract

The invention relates to a balanced type non-reflection band-pass filter, which comprises a differential band-pass filter and an absorption network, comprising two pairs of differential input and output ports, two pairs of quarter-wavelength input and output coupling feeder lines, a half-wavelength center transmission line located between the two pairs of quarter-wavelength input and output coupling feeder lines, and a half-wavelength transmission line connected to the tail ends of the quarter-wavelength input and output coupling feeder lines. The absorption network comprises a pair of first absorption resistors loaded at the input end, a pair of quarter-wavelength short-circuit branches loaded at the tail ends of the first absorption resistors, a pair of second absorption resistors loaded at the tail end of the quarter-wavelength input coupling feeder line, and a half-wavelength transmission line of which the two ends are respectively connected to the tail ends of the second absorption resistors; the quarter-wavelength input coupling feeder line is also used as a quarter-wavelength transmission line in the absorption network. Benefited from the selection of a three-wire coupling structure and the proposal of a fusion working mechanism, the problem of circuit size is effectively solved, and the miniaturization design is realized.
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Description

technical field

[0001] The invention relates to the technical field of wireless communication, in particular to a balanced non-reflection band-pass filter. Background technique

[0002] As a key frequency-selective component in a microwave system, traditional radio frequency filters can transmit signals in a specific frequency spectrum without distortion under ideal conditions, and completely suppress interference signals outside the frequency band, but the energy outside the traditional filter band is reflected state, the reflection of reflected energy back to the source will cause unavoidable interference, and there are certain limitations. Usually additional isolators and attenuators are used to alleviate the problem of interference from reflected energy outside the filter band. However, they will inevitably increase the volume of the system, bring additional losses, and are not easy to integrate. Therefore, starting from the requirements of high stability and high inte...

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0048] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0049] see Figure 18 is a top perspective view of a balanced non-reflection bandpass filter implemented in the present invention. The filter implemented in the present invention is composed of an upper metal strip, an intermediate dielectric substrate and a lower metal ground, including a differential bandpass filter and an absorption network, and the absorption network and the bandpass filter are arranged on the upper metal strip.

[0050] Among them, the differential bandpass filter is a symmetrical three-wire coupling structure, including a pair of differential input ports S1, S1' s...