Wideband frequency translating circuit using balanced modulator
Abstract
Abstract A WIDEBAND FREQUENCY TRANSLATING CIRCUIT ESPECIALLY SUITED FOR CONVERTING, EN MASSE, TELEVISION AND FM SIGNALS IN A GIVEN FREQUENCY RANGE TO A HIGHER FREQUENCY RANGE FOR TRANSMISSION OVER A MICROWAVE LINK. BRIEFLY, THE FREQUENCY TRANSLATING CIRCUIT UTILIZES A MODULATOR COMPRISING ONE OR TWO VARACTOR DIODES COUPLED TO A FIRST PAIR OF CONJUGATE ARMS OF A BICONJUGATE HYBRID NETWORK. MICROWAVE ENERGY IS APPLIED TO A THIRD ARM AND THE MODULATED MICROWAVE ENERGY IS COUPLED OUT OF THE FOURTH ARM. THE WAVE ENERGY CORRESPONDING TO THE TELEVISION AND FM SIGNALS TO BE TRALSLATED IS DIVIDED IN A POWERDIVIDING NETWORK AND APPLIED TO THE DIODES IN OPPOSITE ARMS IN ANTI-PHASE RELATIONSHIP. THIS MODULATING SIGNAL CAUSES THE EFFECTIVE IMPEDANCE OF THE DIODES TO VARY THEREBY MODULATING THE MICROWAVE ENERGY PROPAGATING IN THE DIODE-CONTAINING CONJUGATE ARMS. APPROPRIATE FILTERING MEANS CAN BE PROVIDED AT THE MODULATOR OUTPUT FOR ELIMINATING THE CARRIER AND LOWER SIDEBAND MODULATION COMPONENTS.
Inventors
- 👤 Bernard L Walsh Jr
Bibliographic Details
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