Patent ID: 8803629

Claim:
An electromagnetic coupler, comprising: a first conductor layer, including: a first conductor pattern, and a second conductor pattern separated from the first conductor pattern; a second conductor layer, formed parallel to the first conductor layer, including: a feed pattern connected to a feeding system, and a ground pattern separated from the feed pattern; and a plurality of linear conductors, formed between the first conductor layer and the second conductor laver, electrically connecting the first conductor pattern with the feed pattern, and connecting the second conductor pattern with the ground pattern; wherein: the first conductor pattern is configured to extend toward the second conductor pattern, the second conductor pattern is configured around at least an end of the first conductor pattern, and the at least an end of the first conductor pattern is broader than a middle portion of the first conductor pattern, or alternatively, each of the first conductor pattern and the second conductor pattern is configured into a rectangular shape, the second conductor pattern is composed of four rectangular conductor patterns, and the four rectangular conductor patterns are arranged radially such that each of the four rectangular conductor patterns faces each of a plurality of circumferential sides of the first conductor pattern.