| 摘要 |
<p>A microwave filter comprises a body (10) having a plurality of resonant cavities (e.g. 11 to 16) formed therein, the cavities being open to one surface of the body (10), and a lid (44) disposed over that surface of the body to close the cavities. The cavities (e.g. 11 t0 16) are arranged in a series with each pair of adjacent cavities physically separated from one another by a wall (40) and coupled together by an aperture (41) in that wall; the wall (40) terminates short of the lid (44), with the result that the formation of passive intermodulation products is substantially reduced.</p> |
