The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 2001
Filed:
Oct. 13, 2000
Hugh Robert Malone, Phoenix, AZ (US);
Ronald Dee Fuller, Mesa, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An antenna system (,) capable of transmitting electromagnetic radiation using the technique of combining two quadrature signals for either right hand circular polarization or left hand circular polarization using a circularly polarized antenna (,), or alternately, either horizontal or vertical polarization using a linearly polarized antenna (,) while incorporating feedback for automatically correcting for amplitude and phase variations in the quadrature paths using a switch (,) which selects the sense of the polarization and electronic optimization of the transmit antenna (,). The antenna system includes a control circuit having a polarization switch (,) for receiving a transmission signal. The switch (,) generates first and second output signals which are substantially similar to the transmission signal, and determines whether to apply the transmission signal to one of a first or a second switch output. A coupler (,) receives the first and second switch outputs and generates first and second output signals having a predetermined phase difference. A variable detector (,) detects and adjusts a relative amplitude and phase of the respective first and second output signals. An error correction circuit (,) determines an adjustment to the variable phase detector to vary the phase and amplitude of the first and second output signals in accordance with the relative amplitude and phase of the respective first and second output signals.