A Broadband Offset-Parallel-Parallelograms Printed Endfire Antenna

A broadband offset-parallel-parallelograms printed endfire antenna is presented. The proposed antenna consists of a pair of offset parallel parallelograms, the driver dipoles, the offset double-sided parallel-strip line, and a reflector. The top and bottom patches are printed in parallel on two sides of a substrate plane. The characteristics of the offset parallel parallelograms are studied and discussed. The calculated results fit in well with the results obtained by simulation with ANSYS HFSS. The broadband endfire radiating patterns were achieved. The measured bandwidths were 73.3% for the frequency band (0.89-1.92 GHz), and the gain was about 3.3-4.8 dBi in the operating band.