Abstract: This disclosure provides an antenna and a wireless communication device that includes the antenna in which a high-order mode can be controlled while maintaining good radiation characteristics in both the fundamental mode and high-order mode. The antenna has a radiation electrode provided on a surface of a dielectric substrate and a branch electrode portion that branches from the radiation electrode portion at a branch point near the feeding port toward a vicinity of a position of the radiation electrode at which a maximum voltage of a high-order mode is generated.

Abstract: A dielectric antenna and wireless communication device including the dielectric antenna includes a molded body formed of a composite material of dielectric ceramic and a resin, and a flexible substrate including a radiation electrode. The radiation electrode is excitable at frequencies of 500 MHz to 5 MHz. The composition ratio and the like of the molded body are determined so that the Q value (Qd) thereof due to dielectric loss falls within the range of about 500 to about 1500.

Abstract: An antenna structure including a dielectric base member provided in a non-ground region of a circuit board and a feed radiation electrode provided on the dielectric base member. An outer side surface of the dielectric base member along an edge of one end of the circuit board defines a side surface. A feed electrode is provided in the non-ground region of the circuit board or outside the circuit board such that the feed electrode is disposed along side surfaces of the dielectric base member. One end of the feed radiation electrode defines a feed end connected to the feed electrode, and the other end of the feed radiation electrode defines an open end. The feed radiation electrode has a configuration in which a current path extending from the feed end to the open end has a loop shape so as to be provided on at least the side surface and an upper surface of the dielectric base member.

Abstract: An antenna structure including a dielectric base member provided in a non-ground region of a circuit board and a feed radiation electrode provided on the dielectric base member. An outer side surface of the dielectric base member along an edge of one end of the circuit board defines a side surface. A feed electrode is provided in the non-ground region of the circuit board or outside the circuit board such that the feed electrode is disposed along side surfaces of the dielectric base member. One end of the feed radiation electrode defines a feed end connected to the feed electrode, and the other end of the feed radiation electrode defines an open end. The feed radiation electrode has a configuration in which a current path extending from the feed end to the open end has a loop shape so as to be provided on at least the side surface and an upper surface of the dielectric base member.