Oscillators – Beat frequency – Plural beating
Patent
1977-06-20
1978-07-11
Kominski, John
Oscillators
Beat frequency
Plural beating
325477, 331 43, 333 73C, H03B 2102
Patent
active
041005040
ABSTRACT:
For eliminating an unwanted leaking local oscillator signal from the output of a double-balanced mixer circuit in a microwave frequency up-converter, a band rejection filter formed of series connected impedance inverter elements and a plurality of tuned cavity resonators is provided. The cavity resonators are integrally formed by the cylindrical walls of an aluminum housing, the top portion of which is formed of a plated printed circuit board. That face of the printed circuit board which faces the cylindrical cavities of the resonators is plated with copper to form the upper surface of each resonator. The other side of the printed circuit board is selectively plated with copper layers which extend through the board to the lower layer to provide an extensive ground plane. The impedance inverter elements themselves are formed of quarter-wavelength coaxial cable sections and are directly connected between the tuning stubs of the cavity resonators and have their outer conductor jackets directly soldered to the ground plane. The compactness of the band rejection filter permits it to be disposed in a housing arrangement between the printed circuit cards upon which the active components of the radio hardware are disposed. Losses through lengthy terminal connections are avoided, as a result.
Harris Corporation
Kominski John
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