Triple-mode microstrip filter
AssigneeKing Saud University
InventorsAbdel F.A. Sheta, Majeed A.R. Alkanhal, Saleh A. Alshebeili, Mohammed A.M. Abouelela
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Abstract
Microstrip filters and methods of operation are described. In one aspect, a filter includes a substrate having a substantially planar surface and a microstrip patch located on the surface of the substrate. The microstrip patch includes multiple symmetric slots in the microstrip patch, a first feed line extending from the microstrip patch, and a second feed line extending from the microstrip patch. The first and second feed lines are asymmetric.
Claims17
A filter structure comprising:
- a substrate having a substantially planar surface;
- and
- a microstrip patch disposed on the surface of the substrate, the microstrip patch including:
- a plurality of substantially symmetric slots in the microstrip patch;
- a first feed line extending from the microstrip patch;
- and
- a second feed line extending from the microstrip patch, wherein the first and second feed lines are asymmetric.
A triple-mode filter disposed on a substrate, the filter comprising:
- a substantially square microstrip patch having a plurality of substantially symmetric slots therein;
- a plurality of stubs extending outwardly from the microstrip patch;
- and
- a conductive shorting post in electrical contact with the microstrip patch and a ground layer disposed on an opposite side of the substrate.
A method of producing a triple-mode microstrip filter, the method comprising:
- calculating a fractional bandwidth based on a filter center frequency and a filter bandwidth;
- calculating a microstrip patch size based on the fractional bandwidth;
- calculating a filter slot length based on the fractional bandwidth;
- and
- creating the microstrip filter including a substantially square microstrip patch having the calculated microstrip patch size and having a plurality of filter slots extending inwardly from the edges of the microstrip patch, the filter slots having the calculated filter slot length.
Dependencies are inferred from the claim text.