Abstract: In a radial power combiner/divider in which radial slots are provided for suppression of undesired modes, certain undesired modes which are not adequately suppressed by the radial slots are allowed to be propagated in a central coaxial transmission line and suppressed therein by means of longitudinal slots in the outer conductor. In an alternative embodiment, the central transmission line of the combiner/divider is in the form of a circular waveguide, and the suppression means comprises thin, spaced coaxial cylinders of dissipative material.

Abstract: A method of operating a circular array antenna, Butler matrix, phase shifters and beam forming network is described including a control circuit or computer algorithm for modifying the phase of the phase shifters, one at a time, and measuring the output power received or transmitted by the circular array antenna to estimate the gradient of the output power. The invention overcomes the problem of nulling out interfering signals by modifying the beam pattern of the antenna in certain directions while maintaining the beam pattern in preferred directions for receiving desired signals.

Abstract: A two-antenna array includes first and second coaxial antenna members spaced such that the fore member is in the distant (far) front lobe field of the aft element. Each antenna member includes a like-oriented circularly polarized antenna element with microwave absorbing material disposed in a cavity about its aft, back lobe direction.A high degree of electrical isolation exists between antennas by reason of the aggregate inter-element transmission losses resulting from (i) space propagation loss, (ii) antenna front-to-back discrimination, and (iii) polarization isolation.

Abstract: An integrated antenna-detector device sensitive over a broadband of frequencies with an extended high frequency limit comprising a pair of antenna elements each having first and second ends, the first ends of the elements being positioned proximate to each other while the second ends are displaced from the first ends, a detector unit positioned and connected between the first ends of the antenna elements, and signal output means connected with the antenna elements at a location displaced from their first ends. The signal output means delivers detected output signals from the antenna elements, and also delivers a biasing signal to the detecting unit. The device may take a number of forms including that of a dipole antenna having a linear or conical configuration, and in which a plurality of such dipole elements are arranged to form a log-periodic antenna, and where the pair of antenna elements are arranged to provide a pair of interwound spiral conductive windings to form a spiral antenna.