US 11,837,800 B2
Antenna unit and electronic device
Takafumi Nasu, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Jun. 24, 2021, as Appl. No. 17/356,570.
Application 17/356,570 is a continuation of application No. PCT/JP2020/030063, filed on Aug. 5, 2020.
Claims priority of application No. 2019-154827 (JP), filed on Aug. 27, 2019; and application No. 2019-163567 (JP), filed on Sep. 9, 2019.
Prior Publication US 2021/0320412 A1, Oct. 14, 2021
Int. Cl. H01Q 5/371 (2015.01); H01Q 5/378 (2015.01); H01Q 1/24 (2006.01); H01Q 7/00 (2006.01); H04W 72/044 (2023.01)
CPC H01Q 5/371 (2015.01) [H01Q 1/243 (2013.01); H01Q 5/378 (2015.01); H01Q 7/00 (2013.01); H04W 72/044 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An antenna unit comprising:
a coupling element that includes a first coil and a second coil coupled to each other by electromagnetic-field coupling;
a feeding radiating element; and
a parasitic radiating element; wherein
the first coil and a feeder circuit are connected to the feeding radiating element in series;
the parasitic radiating element is connected to the second coil;
the feeding radiating element is branched into a long portion and a short portion;
a distance between an open end of the parasitic radiating element and an open end of the short portion is shorter than a distance between the open end of the parasitic radiating element and an open end of the long portion of the feeding radiating element;
the antenna unit is provided as an antenna for a first frequency band with fundamental wave resonance of the long portion of the feeding radiating element and fundamental wave resonance of the parasitic radiating element; and
the antenna unit is provided as an antenna for a second frequency band with higher-order resonance of the parasitic radiating element and resonance of the short portion of the feeding radiating element, the second frequency band being higher than the first frequency band.