Patent ID: 8847821
Filing Date: 2014-09-30
Classification: H01Q

Abstract:
1. An antenna comprising: an antenna element in which a helical or loop feed radiation electrode and a helical or loop non-feed radiation electrode are formed on a dielectric base; and a substrate including first and second surfaces opposed to each other, a ground electrode being provided on the first surface of the substrate, the substrate having a non-ground area which is provided at one edge of the first surface of the substrate and in which a ground electrode is not formed, the antenna element being provided in the non-ground area of the substrate, wherein each of the feed radiation electrode and the non-feed radiation electrode has a radiation electrode by which a fundamental wave and a harmonic wave resonate, a capacitance-loading terminal is formed at a position of the antenna element where an electric field distribution of the harmonic wave substantially becomes a node, and a power supply terminal is formed at a feed end of the feed radiation electrode, a power supply terminal connection electrode is provided on the first surface of the substrate and connected to the substrate and to the power supply terminal, and the capacitance-loading terminal is connected to the substrate, and a capacitance-forming electrode having a portion provided on the second surface of the substrate for causing a capacitance to occur between the power supply terminal connection electrode and the capacitance-forming electrode portion is provided on the substrate, wherein the capacitance-forming electrode portion and the power supply terminal connection electrode are provided on opposite sides of the substrate.