Minimal reactance vehicle antenna (MRVA)

Design minimizes interference between co-located antennas


Marine Sgt. Shurman Overby attaches an antenna to his vehicle in Afghanistan.

Mounting multiple antennas on a vehicle results in RF co-site interference. The technology embodied in this patent application is for an optimized performance tactical antenna that operates on rooftops and vehicles in the VHF and UHF bands along with other co-located VHF and UHF antennas.

This antenna provides superior vocal communication over close-spaced (<5 MHz) radio frequency transmissions on the co-located antennas.  The device utilizes a structure which significantly reduces the height and footprint as compared to traditional vertically polarized antennas on vehicle platforms.

The greatest contributor to co-site interference is the close proximity of radiating antennas. RF co-site interference is measured as the S21 between antennas. S21 is the magnitude of the scattering of the signal as a result of the power received between transmitting and receiving antennas.  When the S21 is great enough at the receiving antenna, the radio becomes desensitized. Desensitization means that incoming signals from transmitting antennas not located on a co-sited antenna platform will not be detected by the radio. This novel antenna design minimizes desensitization.

The antenna may be used as a low-gain broadband antenna by operators of radio and video equipment in military, commercial, private, and amateur radio sectors to receive or transmit information from various, limited real estate platforms such as on vehicles or building roof-tops.

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