Loop antenna with improved balanced feed

Communications: radio wave antennas – Antennas – High frequency type loops

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343744, H01Q 1114

Patent

active

045477760

ABSTRACT:
Loop radiating elements for microwave frequencies which result in balanced ower division at the feed points and equi-phase currents in the radiating segments are in the form of an Alford loop design having a "kink" in the stripline path on the side of a printed circuit board opposite the cross-over to restore equal path lengths on both sides of a central feed terminal. Alternatively, the radiating segments of a loop may be in the form of end-loaded bent dipoles which are dual-fed on diametrically opposite points of the loop with equi-phase and amplitude signal. The result is loop radiating elements which have an axial null with a symmetrical doughnut radiating pattern.

REFERENCES:
patent: 2368618 (1945-02-01), Sandretto et al.
patent: 2749544 (1956-06-01), Pike
patent: 3973263 (1973-04-01), Green
patent: 4170012 (1978-06-01), Kaloi

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