A Compact Tri-Band Antenna for Vehicle Communication and Navigation Applications

A compact design of an integrated Tri-band antenna with different polarizations and radiation patterns is proposed in this paper. The antenna structure is composed of two stacked boards that the upper board is a monopolar wire patch with two symmetrical slots and the lower board is a square patch with four rectangular slots. The monopolar wire patch can provide stable conical radiation patterns with vertical polarization within the GSM 850/900, and DCS1800/PCS1900 bands while the side length of the monopolar wire patch is 46mm and the antenna height is 10mm. Also, the square patch shows good circular polarization characteristic for GPS application at L1 bands and provide broadside radiation pattern. The isolation between communication and navigation ports is well above 25 dB within the working frequency bands.