Vehicle-mounted half wave antenna with impedance matching transformer
阅读：318发布：2023-09-04
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1. A VEHICLE-MOUNTED COMMUNICATIONS ANTENNA SYSTEM FOR COMMUNICATIONS EQUIPMENT HAVING AN IMPEDANCE OF SUBSTANTIALLY 50 OHMS, SAID SYSTEM COMPRISING: AN UPSTANDING HALF-WAVELENGTH ANTENNA; AN ANTENNA LEAD-IN CABLE FOR CONNECTION TO THE COMMUICATIONS EQUIPMENT; AND AN IMPEDANCE-MATCHING TRANSFORMER UNIT AT THE LOWER END OF THE ANTENNA COMPRISING A RIGID UPSTANDING INSULATION SUPPORT CORE HAVING A CONTINUOUS EXTERNAL HELICAL GROOVE THEREON WITH THE SUCCESSIVE TURNS OF THE GROOVE SPACED APART EVENLY, A TRANSFORMER COIL HAVING SUCCESSIVE COIL TURNS SEATED IN SAID GROOVE AND EVENTLY SPACED APART THEREBY, CONDUCTIVE MEANS AT THE UPPER END OF SAID SUPPORT CORE CONNECTING THE THE UPPER END OF THE COIL TO THE LOWER END OF THE ANTENNA, A CONDUCTIVE MOUNTING NUT TELESCOPICALLY ENGAGING THE LOWER END OF SAID SUPPORT CORE AND ATTACHED TO THE LOWER END OF THE COIL FOR GROUNDING THE LATTER TO THE VEHICLE BODY, AND A CONDUCTIVE LEAD EXTENDING FROM THE INNER CONDUCTOR OF THE ANTENNA LEAD-IN CABLE UP THROUGH THE SUPPORT CORE AND RIGIDLY SUPPORTED BY THE SUPPORT CORE AND CONNECTED TO THE COIL AT AN INTERMEDIATE POINT ON THE LATTER BETWEEN ITS ENDS EFFECTIVE TO MATCH TE IMPEDANCE OF THE ANTENNA TO THAT OF SAID COMMUNICATION EQUIPMENT, SAID COIL ABOVE SAID LAST-MENTIONED POINT PRESENTING SUCCESSIVE TURNS WHICH ARE EVENTLY SPACED APART BY THE SUCCESSIVE TURN OF SAID GROVE IN THE SUPPORT CORE.
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