US 10,892,816 B1
Baseband polarization switching and isolation improvement
Paul Struhsaker, Austin, TX (US); Paul Posner, Austin, TX (US); Mehran Atamanesh, Austin, TX (US); and Amir Keyvan Khandani, Austin, TX (US)
Assigned to CTH Lending Company, LLC, Pittsburgh, PA (US)
Filed by TIONESTA, LLC, Austin, TX (US)
Filed on Aug. 30, 2019, as Appl. No. 16/557,007.
Int. Cl. H04B 17/02 (2006.01); H04B 7/08 (2006.01); H01Q 21/20 (2006.01); H01Q 21/06 (2006.01); H04B 7/10 (2017.01); H04B 7/185 (2006.01)
CPC H04B 7/0885 (2013.01) [H01Q 21/065 (2013.01); H01Q 21/205 (2013.01); H04B 7/10 (2013.01); H04B 7/18515 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An antenna system, comprising:
a plurality of antenna elements arranged in an array, each antenna element comprising:
one or more first terminals that receive a vertically polarized wireless signal at a radio frequency,
one or more second terminals that receive a horizontally polarized wireless signal at the radio frequency,
a first phase shifter configured to shift a phase of the vertically polarized wireless signal received by the antenna element, and
a second phase shifter configured to shift a phase of the horizontally polarized wireless signal received by the antenna element;
a first signal combining circuit that combines the vertically polarized wireless signal received by the one or more first terminals of the plurality of antenna elements to obtain a combined vertically polarized signal;
a second signal combining circuit that combines the horizontally polarized wireless signal received by the one or more second terminals of the plurality of antenna elements to obtain a combined horizontally polarized signal;
a first frequency converting circuit that converts the combined vertically polarized signal to a baseband vertically polarized signal operating at a baseband frequency different from the radio frequency;
a second frequency converting circuit that converts the combined horizontally polarized signal to a baseband horizontally polarized signal operating at the baseband frequency; and
a baseband processing circuit that combines the baseband vertically polarized signal and the baseband horizontally polarized signal after applying a 90-degree phase shift to the baseband vertically polarized signal or the baseband horizontally polarized signal to obtain a left-hand circularly polarized (LHCP) signal or a right-hand circularly polarized (RHCP) signal.