Hybrid polarized microstrip antenna for multifrequency application

In this article, a novel single layer, single-fed ring antenna is analyzed for multiresonance operation in WLAN/Wi-MAX bands. The antenna geometry consists of a square patch with a dual square ring enclosure which commit multiresonance characteristics. The antenna is excited using electromagnetically from a separate feed patch placed in between the rings. The impedance characteristics are enhanced up to 18% using a unique hourglass type feed patch in between the square rings. The suggested antenna exhibits good return loss at 2.45, 3.5, and 5.8 GHz having bore sight gain response of similar or equal to 5dBi. Hybrid polarization is comprised with circular polarization and dual-linear polarization characteristics are investigated in this research work. This antenna was implemented on Arlon's substrate with dielectric constant Cr = 2.55 and substrate thickness h = 1.524 mm. A good axial ratio is achieved with optimized corner truncation.