Analysis and design of wide band Microstrip-line-fed antenna with defected ground structure for Ku band applications

• Published in: International journal of electronics and communications 2014-01, Vol.68 (10), p.951-957
• Main Authors: Khandelwal, Mukesh Kumar, Kanaujia, Binod Kumar, Dwari, Santanu, Kumar, Sachin, Gautam, A.K.
• Format: Article
• Language: English
• Subjects: Cross-polarization suppression; Defected Ground Structure (DGS); Equivalent circuit model; Wide band Microstrip antenna
• ISSN: 1434-8411; 1618-0399
• DOI: 10.1016/j.aeue.2014.04.017

A wide band Microstrip antenna is proposed for Ku band applications with defected ground structure. A circular shape defect is integrated in the ground plane. A novel equivalent circuit model is proposed for Microstrip patch antenna with defected ground structure. Accurate design equations are presented for the wideband Microstrip antenna and theoretical analysis is done for the proposed structure. The proposed antenna has an impedance bandwidth of 56.67% ranging from 9.8GHz to 17.55GHz, which covers Ku-band and partially X-band. The antenna shows good radiation characteristics within the entire band, and has a gain ranging from 5dBi to 12.08dBi. Minimum isolation between co-polar and cross-polarization level of 20dB and 15dB is achieved in H-plane and E-plane respectively. The simulation of the proposed antenna is done on HFSS v.14, and measured results of fabricated antenna are in good agreement with the theoretical and simulated results.