Search
Inline Waveguide Sharp-Rejection Bandpass Filters With Transmission Zeros Using Resonant Coupling Slots
Abstract
This work presents a design methodology for synthesizing a category of compact inline sharp-rejection waveguide cavity bandpass filters based on novel frequency-variant coupling (FVC) structures. These FVCs consist of a rectangular slot placed in the top broadwall of the WR-90 rectangular waveguide and loaded with an additional top cavity above the slot coupled through the slot. Both the slot and the top cavity resonate in the vicinity of the filter passband and can produce TZs at their resonance frequencies. The top cavity could be arranged either symmetrically or asymmetrically along the reference plane to excite or suppress the cavity TE101 mode, respectively. A double-zero-single-pole (DZSP) response can be achieved by either placing two cavity-loaded slots on opposite broadwalls of the main waveguide or by asymmetrically placing a single cavity-loaded slot on one broadwall. The asymmetry perturbs the field-pattern distributions of the TE100 slot and TE101 cavity modes with regard to the symmetrical case so as to convert them into hybrid slot-and-cavity modes—referred to as S&CM 1 and S&CM 2. This approach excites both S&CM resonances to obtain the DZSP filtering transfer function with size-compactness advantage. Two fifth-order inline waveguide bandpass filter prototypes are designed at the electromagnetic (EM) simulation level based on DZSP-slot-mode (DZSP-SM) and DZSP-slot-and-cavity-mode (DZSPS& CM) FVCs, respectively.Aproof-of-concept prototype of fifth-order sharp-rejectionwaveguide bandpass filter using a DZSP-S&CM FVC, which is centered at 10 GHz and exhibits a pair of close-to-passband TZs, is manufactured and characterized. The measured results are in good agreement with the EM-simulated results, thus fairly verifying the viability of the devised filter design concept.
Citations
-
0
CrossRef
-
0
Web of Science
-
0
Scopus
Authors (5)
-
Lubina Iram
-
Muhammad Yameen Sandhu
-
Roberto Gómez-García prof.
Cite as
Full text
full text is not available in portal
Keywords
Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
IEEE Access
no. 12,
pages 169419 - 169431,
ISSN: 2169-3536 - Language:
- English
- Publication year:
- 2024
- Bibliographic description:
- Iram L., Sandhu M. Y., Lamęcki A., Gómez-García R., Mrozowski M.: Inline Waveguide Sharp-Rejection Bandpass Filters With Transmission Zeros Using Resonant Coupling Slots// IEEE Access -, (2024), s.169419-169431
- DOI:
- Digital Object Identifier (open in new tab) 10.1109/access.2024.3498072
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
seen 6 times
Recommended for you
Inline Waveguide Filter With Compact Frequency-Dependent Coupling Producing Two Additional Poles and Three Transmission Zeros
- U. A. Majeed,
- M. Y. Sandhu,
- A. Lamęcki
- + 2 authors
Inline Waveguide Filter With Transmission Zeros Using a Modified-T-Shaped-Post Coupling Inverter
- M. Y. Sandhu,
- M. Jasiński,
- A. Lamęcki
- + 2 authors
Compact Quasi-Elliptic-Type Inline Waveguide Bandpass Filters With Nonlinear Frequency-Variant Couplings
- M. Y. Sandhu,
- A. Lamęcki,
- R. Gómez-García
- + 1 authors