| 摘要 |
A tuneable microwave filter comprises two branches of the same type each of which is connected to ground (22, 24) at each end and each of which includes a series-connected variable capacitance diode (13, 13A) controlled by a D.C. signal (V), said filter being disposed on the first face (9) of a plane substrate (8), with each branch comprising in series: a micro-strip transmission line (11, 11A); a second variable capacitance diode (12, 12A) situated between the first diode (13, 13A) and the micro-strip transmission line (11, 11A); and the input (E) and the output (S) of said filter taking place at the points interconnecting the micro-strip transmission lines (11, 11A) and the second variable capacitance diodes (12, 12A) of respective ones of the first and second branches. The filter is applicable, in particular, to space telecommunications.
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