Coupling mechanism for and filter using TE011 and TE01.delta. mode resonators
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United States of America Patent
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Oct 16, 2001
Grant Date -
N/A
app pub date -
May 3, 1999
filing date -
May 3, 1999
priority date (Note) -
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Abstract
A cavity-coupled microwave filter that uses TE.sub.011 and TE.sub.01.delta. mode resonators. The cavity-coupled microwave filter includes an input port, a first resonator having a first opening, wherein the first opening receives electromagnetic energy from the input port, a second resonator having a second opening, wherein the second opening receives electromagnetic energy from the input port and wherein the first resonator and the second resonator are electromagnetically coupled. The cavity-coupled microwave filter further includes an output port, a third resonator having a third opening, wherein the third opening transfers electromagnetic energy to the output port and wherein the second resonator and the third resonator are electromagnetically coupled and a fourth resonator having a fourth opening, wherein the fourth opening transfers electromagnetic energy to the output port and wherein the third resonator and the fourth resonator are electromagnetically coupled. By using both positive and negative coupling between resonators and filter ports, both high side and low side transmission poles are created, thereby yielding a bandpass filter.
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