Obtuse Pie-Shaped Quasi-Self-Complementary Antenna for WLAN Applications

An obtuse pie-shaped quasi-self-complementary antenna for wireless local area network (WLAN) applications is presented in this letter. The antenna consists of an obtuse pie-shaped radiating patch fed by a 50- $\Omega$ microstrip line and its complementary metal structure connected to the ground plane. With appropriately adjusting the angle of the acute pie-shaped notch and the acute pie-shaped stub on the ground plane, a conventional wideband self-complementary antenna can be transformed to a progressive dual-band antenna. This characteristic makes the proposed antenna provide two separate impedance bandwidths of 292 MHz (about 11.9% centered at 2.45 GHz) and 1548 MHz (about 28.1% centered at 5.5 GHz). The measured results of the proposed antenna also exhibit respectable radiating patterns and gain values. The designing procedure and the experimental results are discussed in detail.