Non-resonant monopole antenna

Details Non-resonant monopole antenna Non-resonant monopole antenna

H - Electricity

01

Q

351/56

H01Q 9/02 (2006.01) H01Q 9/00 (2006.01) H01Q 9/30 (2006.01) H01Q 9/38 (2006.01) H01Q 17/00 (2006.01)

Patent

CA 1214546

ABSTRACT OF THE DISCLOSURE A relatively short broad band monopole coaxial antenna is provided with a center conductor and an outer radiator. The antenna is mounted above a ground plane and comprises a bare outer radiator portion adjacent the ground plane and a portion remote from the ground plane which is covered with a variable thickness microwave absorbent material, The signal to be transmitted is applied to the base of the monopole antenna adjacent the ground plane. Non-radiated signals propagate up the antenna. The high frequency components are absorbed by the microwave absorbing material. A tip matching network and a base matching network are coupled between the outer conductor and the ground plane for attenuating and matching the low frequency components of the non-radiated signals. The resulting monopole coaxial antenna has no undesirable reflec- tions and has the appearance of infinite effective length antenna.

449059

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