A Novel Compact Multiple-Polarization Modes Antenna

This paper presents a compact multiple-polarization antenna. By loading the material which has high dielectric constant, the size of the antenna is greatly reduced. The operating frequency of the antenna is around 300MHz with the directivity better than 7dB while the aperture-wavelength-ratio is only 0.2. The antenna is fed by eight L-shaped probes, excited in its fundamental TE ₁₁₁ mode. The simulated results show that different polarization modes can be obtained by different combinations of feeding ports and the radiated power can be enhanced by multiple-ports feeding.