Dual-band antenna with highly isolated outputs for global navigation satellite systems receivers

This study describes the design of a dual-band microstrip antenna with four isolated outputs. The proposed antenna has been optimised to operate in the E5a/E5b and E1 bands of the European satellite navigation system Galileo. Each pair of outputs delivers the signal in only one of the operating bands; hence the antenna operates also as a diplexer. The operation principle, the design procedure and measured results are presented and discussed. It is demonstrated by means of measured results that the designed antenna exhibits high isolation between its output ports and that good performance in terms of radiation pattern and polarisation purity was obtained.