H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
351/19, 343/67
H01Q 3/44 (2006.01) H01Q 3/30 (2006.01)
Patent
CA 1208774
ABSTRACT CONTINUOUS FERRITE APERTURE FOR ELECTRONIC SCANNING ANTENNAS A radiating element (10) having a continuous aperture substantially greater than one half the center frequency wavelength for use in an electronically scanned phased array antenna operating in the range of 94 GHz. The new radiating element comprises a ferrite block (12) having a radiating aperture which measures 5.lambda. by 5.lambda. in contrast to the conventional discrete radiating element which measures one-half .lambda. by one- half .lambda.. Thus, where a phased array antenna comprised of an array of the new radiating elements would require only a single radiating element to fill an aperture measuring 5.lambda. by 5.lambda., a phased array antenna of conventional design would require one hundred discrete radiating elements to fill the same aperture. A tapered magnetization (see lines 22) is applied to the continuous aperture ferrite block (12). Thus electronmagnetic energy traveling through the block and exiting the radiating surface is phase shifted, with respect to the energy entering the block, in a similar tapered fashion. The degree of phase shift can be varied by adjusting the slope of the tapered magnetization. This permits scanning of the continuous aperture pattern. The continuous aperture subarray is specially constructed to minimize the spacing between such elements which have been assembled to form an antenna array. The ferrite block (12) has been split into two halves (70 and 72), separated by a dielectric (74), to minimize transverse magnetization and thereby improve the characteristics of the tapered magnetization applied to the ferrite block. When a plurality of such continuous aperture subarrays is used to form an antenna array (80 or 100), provision is made to adjust the phase at the center of each continuous aperture subarray with respect to the phase of the adjacent subarrays, thereby allowing scanning of the entire pattern of the phased array antenna (100).
439109
Hellums Joseph M.
Tang Raymond
Hughes Aircraft Company
Sim & Mcburney
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