Dual-band transmission line tunable resonant tank circuit

Claim 1

IN A TUNABLE DUAL-BAND RF RESONANT TANK CIRCUIT, RF SIGNAL INPUT MEANS AT ONE END OF THE TUNABLE RESONANT TANK CIRCUIT; AN INNER CONDUCTOR CONNECTED TO SAID SIGNAL INPUT MEANS AND LONGITUDINALLY EXTENDED TO PREDETERMINED LENGTH; AN ANNULAR SLEEVE OF CONDUCTIVE MATERIAL SUPPORTED IN MUTUALLY SPACED SURROUNDING RELATION TO SAID INNER CONDUCTOR THROUGHOUT MOST OF THE OPERATIONAL LENGTH OF SAID INNER CONDUCTOR; RF SIGNAL CONDUCTIVE MEANS MOUNTED ON SAID INNERMOST CONDUCTOR PROVIDING AN ANNULAR RF SIGNAL PATH INTERCONNECTING INNER CONDUCTOR AND SAID ANNULAR SLEEVE; A LONGITUDINALLY EXTENDED OUTERMOST CONDUCTOR IN MUTUALLY ANNULARLY SPACED RELATION TO SAID SLEEVE THROUGHOUT THE OPERATIONAL LENGTH OF SAID SLEEVE; RF SIGNAL TUNING MEANS PROVIDING AN RF SIGNAL PATH INTERCONNECTING SAID SLEEVE AND SAID OUTER CONDUCTOR, AND MOUNTED FOR TUNING MOVEMENT BACK AND FORTH LONGITUDINALLY ALONG SAID CONDUCTIVE ANNULAR SLEEVE AND SAID OUTERMOST SHIFTING OF SAID TUNING DRIVE MEANS FOR TUNING POSITION SHIFTING OF SAID TUNING MEANS; AND MEANS FOR SELECTIVELY SHORTING RF DIRECTLY TO SAID SLEEVE CONDUCTOR FOR SWITCHING FROM ONE FREQUENCY BAND MODE TO THE OTHER FREQUENCY BAND MODE OF OPERATION.