Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin
Patent
1991-12-10
1993-11-23
Hille, Rolf
Communications: radio wave antennas
Antennas
With coupling network or impedance in the leadin
343799, 343820, H01Q 2128, H01Q 934, H01Q 918
Patent
active
052648621
ABSTRACT:
The need to widely separate antennas (e.g., transmit and receive antennas) for VHF radio and other applications is avoided by high-isolation antenna systems with collocated antennas and cancellation of intercoupled signals. A transmit antenna in the form of a vertical dipole can be mounted atop a mast with a receive antenna comprising a multi-element array of vertical dipoles supported on the same mast below the transmit antenna. Opposing pairs of the dipole receiving elements are located in 180.degree. positions on opposite sides of the mast so as to be symmetrically located in the omnidirectional antenna pattern of the transmit antenna. Resulting intercoupling to the receive dipoles is equal and in-phase and is cancelled out by the antiphase combining of signals from the dipoles of each pair of the receive dipoles. Reciprocally, cancellation of coupled signals is achieved with reversal of the receive and transmit functions of the respective collocated antennas. Dipole and monopole high-isolation antenna systems can also be configured on yardarms and ground planes.
REFERENCES:
patent: 4749969 (1988-06-01), Boire et al.
patent: 4870420 (1989-09-01), Apostolos
patent: 4992761 (1991-02-01), Seely et al.
Brown Peter Toby
Hazeltine Corp.
Hille Rolf
Onders E. A.
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