Multiple T slot compact & ultra wide band Microstrip patch antenna for Wimax Applications

In this paper, a compact Microstrip patch antenna having a slit associated with the slot for WiMAX application is presented. Instead of semi-infinite ground plane, the proposed antenna adopts the partial ground plane. Radiating patch lies on the Glass epoxy PCB substrate which is having low dielectric constant, thereby provides good bandwidth. Microstrip feedline technique is used to feed the antenna with 50Ω impedance. WiMAX (Worldwide Interoperability for Microwave Access) has three frequency bands- the lower band (2.5–2.69 GHz), the middle band (3.2–3.6 GHz), and the upper band (5.2–5.8 GHz). This proposed antenna enhances the return loss to −22.25 dB at the middle frequency range of WiMAX application. Computer simulated results showing the VSWR <2 in the middle frequency range of WiMAX. The antenna is fed by a coaxial probe feed. The antenna designs and performances are analyzed using Zealand IE3D software. The antenna can be used for many modern communication systems. The bandwidths of the middle frequencies band are 26.5% & the return loss S
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characteristic is −22.24 dB.