INTERLEAVED ELECTRONICALLY SCANNED ARRAYS

摘要

An array antenna including two interleaved array antennas, capable of being operated independently at a first frequency, or together, at a second frequency. Each of the two array antennas is composed of alternating elements of an antenna array, and the two arrays are interleaved. Each of the interleaved arrays may be operated independently, e.g., in the X band, or the arrays may be driven together, as a single array with more densely spaced elements, e.g., in the Ku band.

主权项

1. An array antenna, comprising:
a first plurality of antenna elements arranged in a first square pattern having a first grid spacing; a second plurality of antenna elements arranged in a second square pattern having a second grid spacing, the second grid spacing being the same as the first grid spacing, the antenna elements of the second plurality of antenna elements being interleaved with the antenna elements of the first plurality of antenna elements; a third plurality of antenna elements comprising the first plurality of antenna elements and the second plurality of antenna elements, the third plurality of antenna elements arranged in a third square pattern having a third grid spacing, the third square pattern being oriented at 45 degrees relative to the first square pattern and to the second square pattern, the third grid spacing being less than the first grid spacing by a factor of the square root of 2; a first feed network configured for transmitting and receiving signals through the first plurality of antenna elements; a second feed network configured for transmitting and receiving signals through the second plurality of antenna elements; and a third feed network configured for transmitting and receiving signals through the third plurality of antenna elements.