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 |
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.
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