Design of highly compact self-diplexing Y-shaped slot antenna employing quarter-mode substrate integrated waveguide

摘要

This communication reports the design of highly compact cavity-backedself-diplexing Y-shaped slot antenna for high-isolation employing quartermodesubstrate integrated waveguide (QMSIW). The proposed antenna is builtby using QMSIW, Y-shaped slot and two 50 Ω feed lines. Two unequal radiatingapertures are developed by inserting an Y-shaped slot on the top side ofthe rectangular SIW for radiation at 3.9 and 4.9 GHz for long term evolution(LTE) and public safety band (PSB) applications, respectively. By keepinganother band unaltered, the proposed antenna allows any frequency band tobe tuned independently. The size of antenna is highly compact due to the useof QMSIW cavity. The isolation between two ports of the antenna is greaterthan 34 dB. The antenna achieves 5.43 and 5.85 dBi peak gains at 3.9 and4.9 GHz, respectively. On both the frequency bands, the antenna efficiency isgreater than 85%. The antenna has a front-to-back-ratio of more than 20.6 dBand a separation from co-to-cross polarization level of more than 21 dB.Through manufacture and measurement, the designed antenna is validated.