H - Electricity – 03 – D
Patent
H - Electricity
03
D
333/91
H03D 9/06 (2006.01) H01P 5/00 (2006.01) H05K 1/02 (2006.01) H03B 19/18 (2006.01) H05K 1/16 (2006.01) H05K 3/00 (2006.01)
Patent
CA 1195393
APERTURE-COUPLED MICROWAVE APPARATUS Abstract of the Disclosure In a microwave device, for example a microwave local oscillator with a harmonic mixer for feedback control, problems of coupling the mixer circuit to the R.F. cavity are overcome by providing a d.c. blocking capacitor of the mixer on a planar surface of a support extending across an aperture in one wall of the cavity. In preferred embodiments the capacitor is a planar device formed by a plurality of interdigitated fingers. These fingers are oriented to couple magnetically with the R.F. energy at the aperture in the cavity. The support conveniently comprises a printed circuit board having a ground plane on the same surface as the capacitor, which is located in a small opening in the ground plane. A second ground plane is provided on the opposite side of the printed circuit board, overlying the opening. The two ground planes are interconnected by plate-through-holes. - i -
428268
Znojkiewicz Maciej E.
Adams Thomas
Nortel Networks Limited
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