Waveguide filter

Patent metadata

Field	Value
Publication number	US-2021028526-A1
Application number	US-202016938394-A
Country	US
Kind code	A1
Filing date	Jul 24, 2020
Priority date	Jul 26, 2019
Publication date	Jan 28, 2021
Grant date	—

Abstract

The present disclosure relates to a filter for filtering wavelengths of an electromagnetic signal to provide a filtered signal. The filter includes: at least one commensurate-line structure (CLS); and, at least one stub-modified commensurate-line structure (SMCLS) arranged to provide a corresponding at least one transmission zero in the filtered signal.

First claim

What is claimed is:

1 . A filter for filtering wavelengths of an electromagnetic signal to provide a filtered signal, the filter comprising:
at least one commensurate-line structure (CLS); and, at least one stub-modified commensurate-line structure (SMCLS) arranged to provide a corresponding at least one transmission zero in the filtered signal.

2 . The filter of claim 1 , wherein the at least one CLS and the at least one SMCLS form a band-pass filter.

3 . The filter of claim 1 , wherein at least the at least one CLS or the at least one SMCLS is a rectangular waveguide.

4 . The filter of claim 1 , wherein the at least one SMCLS performs an extracted pole.

5 . The filter of claim 1 , wherein the filter is arranged to provide a filtered signal in the microwave and millimeter-wave frequency bands.

6 . The filter of claim 1 , wherein the filter comprises at least one CLS and at least one SMCLS arranged to form a stepped-impedance structure.

7 . The filter of claim 1 , wherein at least one SMCLS is positioned adjacent to at least one CLS.

8 . The filter of claim 7 , wherein the at least one SMCLS comprises a quarter-wave bandstop element and is connected to the at least one CLS.

9 . The filter of claim 8 , wherein the quarter-wave bandstop element is positioned in the at least one SMCLS and is connected to:
a higher impedance section of the at least one CLS; or a lower impedance section of the at least one CLS.

10 . A filter for filtering wavelengths of an electromagnetic signal to provide a filtered signal, the filter comprising a plurality of stub-modified commensurate-line structures (SMCLS) arranged to provide at least a corresponding plurality of transmission zeros in the filtered signal.

11 . The filter of claim 10 , wherein at least one of the plurality of SMCLS performs an extracted pole.

12 . A method for constructing a filter for filtering wavelengths of an electromagnetic signal to provide a filtered signal, the method comprising:
providing at least one CLS; providing at least one SMCLS, positioning the at least one SMCLS adjacent to the at least one CLS.

13 . The method of claim 12 , wherein positioning the at least one SMCLS adjacent the at least one CLS comprises:
positioning the SMCLS adjacent to a higher impedance section of the CLS; or positioning the SMCLS adjacent to a lower impedance section of the CLS.

14 . The method of claim 12 , wherein providing at least one SMCLS comprises:
providing at least one quarter-wave bandstop element as part of the at least one SMCLS, wherein the quarter-wave bandstop element is arranged to provide one transmission zero in the filtered signal.

15 . The method of claim 14 , wherein the quarter-wave bandstop element is arranged to provide one transmission zero within the frequencies 1 GHz to 300 GHz.

Assignees

• ESA

Inventors

• Martin-Iglesias Petronilo
• Teberio Fernando

Classifications

• H01P1/211 Primary

  Waffle-iron filters; Corrugated structures · CPC title

• H01P1/2005

  Electromagnetic photonic bandgaps [EPB], or photonic bandgaps [PBG] · CPC title

• H01P1/209

  comprising one or more branching arms or cavities wholly outside the main waveguide · CPC title

• H01P1/208 Primary

  Cascaded cavities; Cascaded resonators inside a hollow waveguide structure (H01P1/205 takes precedence) · CPC title

• H01P1/213

  combining or separating two or more different frequencies (H01P1/215 takes precedence) · CPC title