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- W4252238193 abstract "The radiation direction from a parabolic dish antenna can be electronically controlled through the use of a switched parasitic element closely coupled to a dipole feed. Through the application of a dc voltage, the half-wavelength-long parasitic element is switched between open and short circuit using a p-i-n diode at its center. With a parasitic element vertically offset from the horizontal dipole, the performance of the antenna in both switch positions has been optimized. At 1.5 GHz, using a 2.4 m diameter reflector, beam skewing on the order of 1.5° at the −6 dB point can be achieved for a feed element spacing of 0.6 wavelengths. At a parasitic element spacing of 0.5 wavelengths, the main lobe is better than 15 dB above the unshifted null. The analysis of such a structure requires the calculation of the current in both the driven element and the parasitic element and the summation of their fields on the surface of the reflector independently. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 23: 200–203, 1999." @default.
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- W4252238193 date "1999-11-20" @default.
- W4252238193 modified "2023-09-26" @default.
- W4252238193 title "Switched parasitic feeds for parabolic antenna angle diversity" @default.
- W4252238193 doi "https://doi.org/10.1002/(sici)1098-2760(19991120)23:4<200::aid-mop2>3.3.co;2-x" @default.
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