Small antennas such as microstrip patch antennas

摘要

In an antenna having a conductor of a length L and a dielectric material with a dielectric constant epsilon r1 contacting the conductor, a matching dielectric layer epsilon r2 less than epsilon r1 matches the dielectric constant to free space. Preferably epsilon r2= 2ROOT +E,rad epsilon r1+EE , L= lambda o/(2 2ROOT +E,rad epsilon r1+EE ). The depth d of the second dielectric is a quarter wavelength in the matching layer. Multiple matching layers with successively decreasing dielectric constants forms embodiments. In one embodiment the resonant conductive arrangement is a microstrip patch antenna with the dielectric material supporting a patch and matching layer covering the dielectric material.