A Compact Wideband ACS-fed Monopole Antenna for Wireless Applications Around 2.45 GHz

A new compact wideband printed is proposed for wireless applications aroun 2.45 GHz. The antenna structure comprises a quarter circle united with a rect-angular section and a flipped ground plane of similar geometry as the patch. It is fed through an asymmetric coplanar strip (ACS) by a SMA connector at an optimized location. The overall size of the antenna is only 38 × 10.8 × 0.8 mm³. Simulation and experiment are performed to validate the design. Results show that the antenna operates in the frequency rang from 2.35 to 2.46 GHz (11.5%) based on |S₁₁| ≤ -10 dB, and radiates nearly omni-directionally over the frequency bandwidth. The simple structure, compact size, and wideband characteristics make the proposed antenna a suitable candidate for broad range of applications in the available wireless communication standards.