Combined frequency determining circuit and antenna

Claim 1

A COMBINED CAVITY-ANTENNA STRUCTURE COMPRISING: A HOUSING OF CONDUCTIVE MATERIAL FORMING A CAVITY STRUCTURE FOR PROPAGATING ELECTROMAGNETIC ENERGY, SAID HOUSING HAVING A SLOT THEREIN AND TOGETHER FORMING AN ANTENNA BY WHICH ELECTROMAGNETIC ENERGY CAN BE RADIATED AND RECEIVED, OSCILLATOR MEANS INCLUDING A MULTI-ELEMENT ELECTRON CONDUCTIVE DEVICE HAVING AT LEAST SOURCE, CONTROL AND COLLECTOR ELECTRODES, MEANS FOR DIRECTLY CONNECTING AT LEAST TWO OF SAID ELECTRODES TO SAID HOUSING AT RESPECTIVE POINTS THEREON ON OPPOSITE SIDES OF THE SLOT, THE CAVITY STRUCTURE FORMING A FREQUENCY DETERMINING CIRCUIT FOR SAID OSCILLATOR MEANS, AND FEEDBACK MEANS ELECTRICALLY COUPLED TO SAID HOUSING AND ONE OF SAID ELECTRODES FOR PROVIDING A REGENERATIVE SIGNAL FEEDBACK PATH BETWEEN SAID FREQUENCY DETERMINING CIRCUIT AND SAID ELECTRON CONDUCTIVE DEVICE WHEREBY SAID OSCILLATOR MEANS PRODUCES ELECTROMAGNETIC ENERGY WHICH IS RADIATED BY SAID ANTENNA, THE REFLECTED IN-PHASE AND OUT-OF-PHASE ENERGY RECEIVED BY SAID ANTENNA BEING COUPLED BY SAID FEEDBACK MEANS TO SAID OSCILLATOR MEANS TO PRODUCE A DOPPLER SIGNAL AS THE ANTENNA MOVES RELATIVE TO THE TARGET.