Patent ID: 6307525
Filing Date: 2001-10-23
Classification: H01Q

Abstract:
A multiplexing antenna operable at each one of N different frequencies, wherein N is an integer greater than 1, said antenna comprising:an input port for transmitting/receiving energy at one or more of said N frequencies;N output ports, said output ports being physically spaced from each other and from said input port;N antenna elements, each one of said antenna elements being connected to a different one of said N output ports, and each one of said antenna elements being operable at a different one of said N frequencies;a transmission line multiplexer network selected from the group microstrip transmission line, multiplexer network and stripline transmission line multiplexer network interconnecting said input port and said N output ports;said transmission line multiplexer network having a plurality of interconnected transmission line elements whose individual characteristic impedance and individual length are selected to provide a matched-impedance path between a given one of said antenna elements and said input port when a corresponding one of said N frequencies for which said given one of said antenna elements is applied to said input port; andsaid transmission line multiplexer network concomitantly providing a mismatched-impedance path between all others of said antenna elements and said input port when said corresponding one of said N frequencies is applied to said input port.