Investigations of compact tri-band antenna for CNSS application

In this paper, a new tri-band antenna with characteristic of miniaturization and low profile is proposed. The size is less than 45mm*45mm*9mm. This compact antenna is working at B
₃
L and S frequencies of Compass Navigation Satellite System (CNSS). The tri-band antenna is obtained with two microstrip patch antennas and a quadruple inverted-F antenna (QIFA) which is inserted in the two layers of substrates to reduce the height and achieve low profile. The simulated and measured results of this antenna are presented. Furthermore, the isolation performances of this antenna are investigated. This results are served as a guideline, therefore, another improved tri-band antenna which is less than 35mm*35mm*15mm is achieved. This 35mm antenna provides good isolation performances than the 45mm one. Meanwhile, the 35mm antenna has the stable performances.