US 11,837,799 B2
Antenna apparatus
Shinya Tachibana, Nagaokakyo (JP); and Takafumi Nasu, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on May 19, 2021, as Appl. No. 17/324,156.
Application 17/324,156 is a continuation of application No. PCT/JP2019/047118, filed on Dec. 3, 2019.
Claims priority of application No. 2018-248689 (JP), filed on Dec. 28, 2018; and application No. 2019-074126 (JP), filed on Apr. 9, 2019.
Prior Publication US 2021/0273334 A1, Sep. 2, 2021
Int. Cl. H01Q 1/04 (2006.01); H01Q 5/335 (2015.01); H01Q 9/04 (2006.01); H04B 1/04 (2006.01)
CPC H01Q 5/335 (2015.01) [H01Q 9/0414 (2013.01); H04B 1/0483 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An antenna apparatus comprising:
a first antenna; and
a second antenna usable in a communication frequency band different from a communication frequency band in which the first antenna is used; wherein
the first antenna includes a first radiating element, a second radiating element, a phase adjustment circuit, a first coil, and a second coil;
the first radiating element and the second radiating element include parallel extending portions;
the first coil is connected between the first radiating element and a connection portion of a first feed circuit;
the second coil is connected between the second radiating element and a ground conductor;
the phase adjustment circuit is connected to the second coil;
the first coil and the second coil are provided in a single coupling element; and
the phase adjustment circuit adjusts a phase difference between a current flowing through the first radiating element and a current flowing through the second radiating element to greater than or equal to about 90 degrees and less than about 180 degrees in a communication frequency band of the second antenna.