US 12,009,567 B2
Directional coupler, radio communication device, and control method
Yoshiki Sugawara, Kanagawa (JP); Yukihito Iida, Kanagawa (JP); and Satoshi Suda, Kanagawa (JP)
Assigned to SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
Appl. No. 17/310,978
Filed by SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
PCT Filed Feb. 17, 2020, PCT No. PCT/JP2020/006007
§ 371(c)(1), (2) Date Sep. 2, 2021,
PCT Pub. No. WO2020/189130, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 2019-049313 (JP), filed on Mar. 18, 2019.
Prior Publication US 2022/0140462 A1, May 5, 2022
Int. Cl. H01P 5/18 (2006.01); H01P 5/02 (2006.01); H03H 7/48 (2006.01); H04B 1/44 (2006.01)
CPC H01P 5/184 (2013.01) [H01P 5/02 (2013.01); H03H 7/48 (2013.01); H04B 1/44 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A directional coupler, comprising:
a primary line that transmits signals from a first terminal to a second terminal;
a secondary line that gets coupled with the primary line and draws some of the signals into a third terminal;
a first switching unit that switches connection destination of the third terminal between one end of the secondary line and other end thereof;
a first impedance regulating unit that is installed in between the one end of the secondary line and ground, and that changes impedance according to frequency of the signals;
a second impedance regulating unit that is installed in between the other end of the secondary line and the ground, and that changes impedance according to the frequency of the signals; and
a resonance circuit that is installed in between the first switching unit and the third terminal, and that changes impedance of the third terminal according to the frequency of the signals, wherein the resonance circuit includes:
a coupling planarization unit that is electrically connected in series in between the first switching unit and the third terminal, wherein the coupling planarization unit performs such adjustment that frequency dependence of coupling characteristic between the first terminal and the third terminal is planarized in a predetermined band, and
a matching regulator unit that is electrically connected in parallel with the coupling planarization unit and in between the first switching unit and the third terminal.