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Design of Broadband Dual Linearly-Polarized Microstrip Patch Antenna

A novel type of ±45° dual linearly-polarized microstrip patch antenna is presented. Two L-shaped probes locate in an orthogonal position which motivate the presented antenna. The designed antenna exhibits excellent properties. The cross-polarization level of the designed antenna in the operating frequency is more than 22dB. The overlapping impedance bandwidth is more than 37%, ranging from 3.95 to 5.8GHZ. For these two polarizations, the gains are around 9.2dBi. The front-to-back ratio (FBR) is relatively large which is more than 15dB.