Design Of Rectangular Slot Microstrip Antenna For Ultrawideband Applications

This paper presents a design of planar rectangular microstrip patch antenna connected to an offset microstrip feedline for ultawideband applications. A rectangular shaped slot on the ground plane increase the impedance bandwidth upto 117.73% (2.9-11.2GHz). A proposed antenna is designed and fabricated on glass epoxy substrate FR4 with a dielectric constant of 4.4 and loss tangent of 0.02 having dimensions of 33 x 35.5 x 1.6 mm3 . Antenna is simulated using electromagnetic simulation software CADFEKO suite 7.0. The average efficiency is 80%, and stable VSWR (1.0-2.0) achieve over 2.9GHz to 11.2GHz range in simulated and measured results. The radiation pattern of E-plane and H-plane are directional and omni directional over the entire operating band.Simulated and measured results of the proposed antenna are in good agreement.