Defected Ground Multiband Passive Circuit Multi Slot Dual U Shaped Monopole Antenna for GSM/WLAN/WiMAX/X Bands Applications
Deepika Verma, K.K. Verma and Chandan
In this article a low profile multiband multi slot with defected ground plane monopole antenna with passive circuit for GSM/WLAN/WiMAX/X bands applications has been presented. The proposed antenna has been implemented using multi slot cut with two slits added with dual U shaped inverted to each other on the patch to achieved multiband application with defected ground structure. The frequency bands covered (1.6-1.9 GHz)/1.7GHz, (2.7-3.1GHz)/2.8GHz, (4.7-4.9GHz)/4.8GHz and (6.8-8.7GHz)/7.4GHz and total area is covered 38×29×0.8mm3. The proposed antenna has simulated peak gain 3.8 dBi, 4.6 dBi, 2.9 dBi and 5.7 dBi respectively and measured peak gain 3.4 dBi, 4.2 dBi, 2.7 dBi and 5.3 dBi respectively. and also VSWR achieved for simulated results are 1.4dB, 1.1dB, 1.3dB and 1.2dB and measured VSWR results are 1.6dB, 1.3dB, 1.5dB and 1.3dB. This antenna has generated more than 90% efficiency for all bands, 96% for 1.7GHz, 92% for 2.8GHz, 97% for 4.8GHz and 94% for 7.4GHz achieved efficiency. The proposed antenna presents a good agreement between simulated and measured results. The implemented antenna is more miniaturized than the exiting antennas. The proposed antenna has been transfer input impedance to the receiver port 50Ω for normal return loss S11 act of the passive circuit devices elements.
Keyword: Defected ground plane, dual U shaped, multiband monopole antenna, microstrip fed and wireless application