DGS-Integrated Air-Loaded Wideband Microstrip Antenna for X- and Ku-Band

Over the past few years, there has been a huge demand to design a simple printed antenna for high-speed multimedia communication with low cost, compact size, wide band, and low copolarization (CP) to cross-polarization (XP) isolation levels. In this letter, a simple and completely planar air-gap-loaded rectangular microstrip antenna integrated with single shorting post and defected ground structures has been thoroughly investigated to obtain wide bandwidth of 58.72% (8.3-15.2 GHz) at X- and Ku-band. Besides exhibiting good broadside patterns and desirable gain (>5 dBi), good CP-to-XP isolation levels (16 dB) are also achieved. Furthermore, the proposed antenna has a low profile of 0.083 λ0.