Patent ID: 6108526
Filing Date: 2000-08-22
Classification: H01Q,H04B

Abstract:
An active diversity antenna system connected to a line carrying a power supply bias voltage and communication signals, said antenna system comprises:a plurality of antennas;signal circuitry coupled between said line and at least one selected antenna of said plurality of antennas; andcontrol circuitry responsive to said bias voltage on said line, said control circuitry provides control signals to said signal circuitry in response to said bias voltage, said control circuitry further provides antenna selection signals to select said selected antenna of said plurality of antennas in response to said bias voltage;wherein said control circuitry includes a toggle flip-flop coupled to antenna selection switches, said toggle flip-flop being responsive to interruptions in said bias voltage to produce antenna selection signals;wherein said flip-flop is responsive to a reset signal from said voltage level detector to set said antenna selection signals to a default antenna of said plurality of antennas.