Design of dual linearly polarized, electrically small, low-profile, broadside radiating, Huygens source antenna

A design of electrically small, low-profile, dual linearly polarized (LP), Huygens source antenna with high isolation, and broadside radiation patterns with high front forward radiation and low back forward radiation, i.e., high front-to-back ratios (FTBRs), is presented. A prototype dual-LP antenna was fabricated, assembled, and tested. The measured results, in good agreement with their simulated values, confirm that it has an electrically small size (ka=0.904) and low profile (0.0483X0), with port isolation over 25.8 dB within its fractional impedance bandwidth (FBW), 0.46%, where |Sn|< −10 dB. When port 1 (port 2) is excited, the peak realized gain is 2.03 dBi (2.15 dBi) strictly along the broadside direction with the corresponding FTBR being 12.4 dB (12.1 dB).