Low cost linear/circularly polarized antenna
AssigneeRCA Corporation
InventorsOakley McDonald Woodward, Matti Solmu Olavi Siukola
Life of this patent
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Abstract
A linear/circularly polarized antenna system is provided by four conductive elements. The conductive elements are joined in pairs at their ends with the joined ends spaced by a conductive support member from a flat reflector. The lengths of the conductive elements of each dipole element are changed from being equal lengths of approximately a quarter operating frequency wavelength to one slightly longer and the other slightly less than a quarter wavelength to selectively change operation from that of a linearly polarized antenna to that of a circularly polarized antenna.
Claims5
An antenna system operating over a given band of frequencies comprising:
- a flat reflective panel,
- support means including a pair of separated support members extending generally orthogonal to said panel,
- a first pair of generally orthogonally oriented conductive elements joined together at one end to one of said support members a distance of about one-quarter wavelength at a given frequency within said given band of frequencies from said panel, at least one of said elements being at least about one-quarter wavelength long at said given frequency,
- a second pair of generally orthogonally oriented conductive elements joined together at one end to the other of said support members about said distance from said panel, at least one of said elements being at least about one-quarter wavelength long at said given frequency, each one of said pair of elements in said first pair extending in generally an opposite direction from one of the conductive elements in said second pair of elements, each of said conductive elements being inclined toward said reflective panel with each of said conductive elements having a conductive loading rod connected across the free end thereof, and
- a coaxial transmission line feed having an outer conductor coupled to one of said pair of orthogonally oriented elements and a center conductor coupled to the other of said pair of orthogonally oriented conductive elements at a point located approximately where said conductive elements are joined together to said support members.
Dependencies are inferred from the claim text.