Frequency Tuning & Bandwidth Enhancement in Compact Microstrip Antenna using Saw Tooth Shaped DGS

In the paper a saw tooth shaped Defective Ground Structure (DGS) is implemented in the ground surface of the antenna to achieve the GSM frequency band. The length of the defect is then modified in order to attain resonance of the microstrip antenna at the Bluetooth frequency band and the Wimax frequency band. Furthermore to elevate the performance of the proposed microstrip antenna at the GSM application frequency band and the Wimax application frequency band, dual DGS is integrated in the ground plane. Thus improved bandwidth and improved gain is achieved in the GSM application frequency band and the Wimax application frequency band for proposed microstrip antenna.