Transmit and receiving antenna diversity apparatus and communication method

摘要

A diversity antenna apparatus and method adaptable for use with communication equipment is provided which can assure an acceptable transmission and/or reception condition in three principle dimensional (X,Y,Z) directions. The diversity antenna apparatus comprises a plurality of antennae (10, 11, 12, 13) for transmitting and/or receiving a circularly polarized wave and an antenna selection circuit (20, 24, 25) which selections one of the antennae for transmission and/or reception based on information representative of reception levels of the antennae. A first group of the antennae may provide a first substantially semispherical radiation pattern and a second group of the antennae may provide a second substantially semispherical radiation pattern such that the first and second groups of antennae as a whole provide a substantially spherical radiation patter.