초록

An array antenna having a plurality of radiating elements positioned in a planar configuration is divided into four separate quadrants. The array antenna is capable of being switched between two modes, a narrow pencil beam mode and a cosec2qq2qq

대표청구항 ▼

An array antenna connectable to an input/output port for forming an aperture to transmit or receive radar signals, said array antenna being switchable between at least two modes, comprising: aperture means having an upper portion and a lower portion, each including a plurality of laterally extending

An array antenna connectable to an input/output port for forming an aperture to transmit or receive radar signals, said array antenna being switchable between at least two modes, comprising: aperture means having an upper portion and a lower portion, each including a plurality of laterally extending waveguides with a number of radiating elements disposed thereon; a lower intermediate feed means communicating with each of said laterally extending waveguides of said lower portion of said aperture means, for dividing the energy of an illuminating radar signal among, or for combining the energy of a received radar signal from, said laterally extending waveguides; upper intermediate feed means communicating with each of said laterally extending waveguides of said upper portion of said aperture means, for dividing the energy of an illuminating radar signal among, or for combining the energy of a received radar signal from, said laterally extending waveguides; and switch means having at least a first position and a second position, and connected between said input/output port, and said lower intermediate feed and said upper intermediate feed for coupling radar signals; whereby when said switch means is in said first position, said input/output port is connected to both said upper intermediate feed and said lower intermediate feed causing said array antenna to be in its first mode, and when said switch means is in said second position, only one of said intermediate feed means is connected to said input/output port causing said array antenna to be in its second mode.