DESIGN OF LOOP ANTENNAS AND MATCHING NETWORKS FOR LOW-NOISE RF RECEIVERS - ANALYTIC FORMULA APPROACH

A comprehensive procedure for designing loop antennas and matching net works for low-noise receivers, by using an analytical formula approach , is presented. The effective length l(effect) of an equivalent transm ission line, for a single-turn loop antenna, and the effective couplin g coefficient rho, for a multiturn loop antenna, are introduced in the approximate formulas for the impedances of single loop as well as mul titurn loop antennas, which are valid up to the first resonant frequen cy. Hence, an accurate design of loop antennas and matching networks o f receiving systems can be achieved by using circuit analysis. The the oretical results are compared with the measured results.