Non-resonant coaxial monopole antenna

Details Non-resonant coaxial monopole antenna Non-resonant coaxial monopole antenna

1983-04-25

1985-04-23

Lieberman, E.

Communications: radio wave antennas

Antennas

With variable reactance for tuning antenna

343830, 343791, 343873, 343861, H01Q 902, H01Q 938

Patent

active

045132909

ABSTRACT:
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 reflections and has the appearance of infinite effective length antenna.

REFERENCES:
patent: 2567260 (1951-09-01), Wiley
patent: 3358286 (1967-12-01), Heins
patent: 3582952 (1971-06-01), Heins
patent: 4008477 (1977-02-01), Babij et al.

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