PHASED ARRAY STUDY.
Final rept. for 1 Jul 63-30 Mar 65.
HUGHES AIRCRAFT CO FULLERTON CALIF GROUND SYSTEMS GROUP
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A ten element phased array using semiconductor diode phase shifters has been designed and tested at S-band. The design has emphasized maximum phase shifter capability for ultimate use in medium and high power phased array radar system applications. A hybrid coupled bit circuit was employed as the basic phase shifting circuit. The phase shifter circuit and diode were optimized to achieve high pulsed power capability with low insertion loss. The optimization procedure has lead to the use of a large junction capacitance diode operating in a low impedance circuit. Phase shifters were tested to a level of 5 kw peak and 200 w. average with no limiting or instabilities occurring. The diode bit insertion loss contribution was 1.3 db. Radiation pattern tests of the assembled antenna array showed side-lobe levels of between 20 and 25 db for most all cases over a beam scan range of 50 degrees. Phase shifter performance in the antenna array with regard to amplitude and phase errors was such as to produce pattern errors which were 10 to 15 db below the isotropic level. This allows the attainment of low side-lobe levels and a negligible reduction in antenna gain due to aperture errors. The experimental phase module design has lead to a proposed practical package employing the principles of the experimental module. The new design will be developed under a contract with the Navy Bureau of Ships. Author