Waveguide filter

Patent metadata

Field	Value
Publication number	US-11223095-B2
Application number	US-202016938394-A
Country	US
Kind code	B2
Filing date	Jul 24, 2020
Priority date	Jul 26, 2019
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

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);
at least one stub-modified commensurate-line structure (SMCLS) arranged to provide a corresponding at least one transmission zero in the filtered signal;
at least one higher impedance structure; and
at least one lower impedance structure comprising one of the at least one SMCLS and one of the at least one CLS.

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 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 the filtered signal in microwave and millimeter-wave frequency bands.

6. The filter of claim 1 , wherein the filter comprises the 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 the 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. The filter of claim 1 , wherein at least one stub of the at least one SMCLS projects upwardly, downwardly, or both, from an axis along which the at least one CLS and the at least one SMCLS are arranged.

11. The filter of claim 1 , wherein at least one stub of the at least one SMCLS projects upwardly and downwardly from an axis along which the at least one CLS and the at least one SMCLS are arranged.

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 commensurate-line structure (CLS);
providing at least one stub-modified commensurate-line structure (SMCLS);
positioning the at least one SMCLS adjacent to the at least one CLS, wherein the filter comprises at least one higher impedance structure and at least one lower impedance structure; and
incorporating at least one of the at least one SMCLS within at least one of the at least one lower impedance structure.

13. 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 at least one quarter-wave bandstop element is arranged to provide one transmission zero in the filtered signal.

14. The method of claim 13 , wherein the at least one quarter-wave bandstop element is arranged to provide one transmission zero within the frequencies 1 GHz to 300 GHz.

15. 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;
at least one higher impedance structure; and
at least one lower impedance structure comprising one of the plurality of SMCLS and at least one commensurate-line structure (CLS).

16. The filter of claim 15 , wherein at least one of the plurality of SMCLS performs an extracted pole.

Assignees

• ESA

Inventors

• Martin-Iglesias Petronilo
• Teberio Fernando

Classifications

• 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

• H01P1/211 Primary

  Waffle-iron filters; Corrugated structures · CPC title

• H01P1/213

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