Patent ID: 7659867
Filing Date: 2010-02-09
Classification: H01Q

Abstract:
1. A complex antenna comprising: a substrate; a power feed terminal provided at a side of the substrate; four helical antenna devices disposed on the substrate at intervals of 90 degrees centering on a first axis perpendicular to the substrate; four delay lines having lengths that differ from each other by a quarter wavelength; and four switch modules which are connected to the power feed terminal in common and each of which is connected to a respective helical antenna device and a respective delay line, wherein each switch module selects one of a first mode in which the power feed terminal and each helical antenna device are directly connected and a second mode in which each delay line is connected to each helical antenna device so that a phase of a power feed fed from the power feed terminal and propagated from each delay line to each helical antenna device is sequentially shifted by 90 degrees.