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A coupled line-loaded low-pass or band-stop filter with reconfigurable transmission response

A technology of band-stop filter and transmission response, applied in the field of filter, can solve the problems of single in-band response and uncompact structure of microstrip filter, and achieve the effect of simple structure

Active Publication Date: 2021-10-19
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: the purpose of the present invention is to provide a simple structure and easy-to-make novel structure filter for the existing microstrip filter structure which is not compact and has a single response in the band, so that the position of the ripple in the band can be adjusted, And the out-of-band suppression feature is optional

Method used

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  • A coupled line-loaded low-pass or band-stop filter with reconfigurable transmission response
  • A coupled line-loaded low-pass or band-stop filter with reconfigurable transmission response
  • A coupled line-loaded low-pass or band-stop filter with reconfigurable transmission response

Examples

Experimental program
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Embodiment 1

[0023] In this embodiment, a new type of filter composed of ideal transmission line elements is taken as an example with the bandwidth of the filter being 0-500MHz and S11 being -20dB.

[0024] like figure 1 As shown, a coupled line loading low-pass or band-stop filter with reconfigurable transmission response; comprising: an input port (1), an output port (2), a coupled transmission line section 1 (3) and a coupled transmission line section 2 (4), one section of uniform transmission line (5), two sections of open branch line one (6) and open branch line two (7) for external loading, two sections of open branch line three (8) for internal loading and open circuit Branch line four (9);

[0025] The coupled transmission line segment one (3) includes a port one (11) and a port two (12), and the coupled transmission line segment two (4) includes a port three (10) and a port four (13);

[0026] A uniform transmission line (5) is connected in series on the port three (10) of the c...

Embodiment 2

[0039] In this embodiment, the bandwidth of one set of filters is 0-300MHz, and S11 is -20dB; the bandwidth of another set of filters is 0-500MHz, and S11 is -20dB. A new type of filter composed of ideal transmission line components is example.

[0040] like figure 1As shown, a coupled line loading low-pass or band-stop filter with reconfigurable transmission response; comprising: an input port (1), an output port (2), a coupled transmission line section 1 (3) and a coupled transmission line section 2 (4), one section of uniform transmission line (5), two sections of open branch line one (6) and open branch line two (7) for external loading, two sections of open branch line three (8) for internal loading and open circuit Branch line four (9);

[0041] The coupled transmission line segment one (3) includes a port one (11) and a port two (12), and the coupled transmission line segment two (4) includes a port three (10) and a port four (13);

[0042] A uniform transmission lin...

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Abstract

The invention discloses a coupled line-loaded low-pass or band-stop filter with reconfigurable transmission response. The present invention includes an input port, an output port, a section of coupled transmission line, a section of uniform transmission line, two sections of externally loaded open-circuit stub lines, and two sections of internally loaded open-circuit stub lines; according to different filter parameter indexes, the present invention can quickly A circuit structure that meets the requirements is synthesized; and the structure is simple, and the position of the ripple in the band is adjustable; the position of the transmission zero point outside the passband of the present invention is adjustable, that is, the out-of-band suppression is selective, and the transmission response is in addition. The electrical length is 90 The attenuation at integer multiples of degrees is infinite.

Description

technical field [0001] The present invention relates to a filter, in particular to a coupled line-loaded low-pass or band-stop filter with reconfigurable transmission response. Background technique [0002] In the communication system, the filter is a very important electronic device. It can effectively filter out some frequency points of a specific frequency in the communication system or frequency points other than the frequency, so as to ensure that the communication system can transmit signals more efficiently and accurately. [0003] With the rapid development of the communication field, the system has higher and higher requirements on the filter index, making the filter more and more compact and with low insertion loss. And there is more selectivity in the band and higher inhibition out of the band. SUMMARY OF THE INVENTION [0004] Purpose of the invention: The purpose of the present invention is to solve the problems of the existing microstrip filter that is not ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203H01P1/20
CPCH01P1/20H01P1/2039
Inventor 金秀华周玉婷黄晓东
Owner NANJING UNIV OF POSTS & TELECOMM
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