Ehime University

Mayumi Matsunaga

Kenji Kakemizu

Yasuhiro Yokota

A shared antenna communicates radio waves with different frequencies or different polarization characteristics, and has a simple configuration that can be placed in a small device. The antenna includes a plurality of loops of the shape of a cross in a spiral fashion and includes a gap provided at a certain midpoint in the spiral loops and a power supply portion provided in a central portion. The distance of the gap is set such that electromagnetic coupling is caused at a first frequency and no electromagnetic coupling is caused at a second frequency different from the first frequency.

Antenna

An antenna includes a simple structure and a small null angle, which achieves communication using a circularly-polarized wave. The antenna includes a conductive wire arranged in loops in such a way as to form a cross shape. A part at which two line portions projecting outward from the center portion define a right angle is included in the loop path of the conductive wire. This part allows the antenna to transmit and receive an electromagnetic wave in all directions and have a circular polarization characteristic.

Growing community of inventors

Ehime, Japan

Mayumi Matsunaga