Effect of placing mushroom electromagnetic bandgap structures at the inset feedline of microstrip patches

• Published in: IET microwaves, antennas & propagation Vol. 6; no. 13; pp. 1487 - 1497
• Main Authors: BHUVANESWARI, B, MALATHI, K, SHRIVASTAV, A. K
• Format: Journal Article
• Language: English
• Published: Stevenage Institution of Engineering and Technology 23.10.2012; The Institution of Engineering & Technology
• Subjects: Antennas; Applied sciences; Electronics; Exact sciences and technology; Materials; Radiocommunications; Telecommunications; Telecommunications and information theory; Lateral lobe; Mutual coupling; Positioning; Photonic band gap; Parametric analysis; Return loss; Printed antenna; Directivity; Simulation; Photonic crystal; Radiation pattern; Miniaturization; Antenna array
• ISSN: 1751-8725; 1751-8733
• DOI: 10.1049/iet-map.2011.0237

Placement of mushroom electromagnetic bandgap (EBG) structures at the inset feedline of patch antenna operating at 4.8 GHz is analysed, in this study. Proposed design for (i) single patch and (ii) two-element patch array exhibits significant improvement in return loss, bandwidth and mutual coupling loss. Parametric analysis confirms that, the optimal position of EBG structures is at a distance of 1.5 mm on both sides of the feedline. A 6% reduction in antenna size is realised when compared with conventional placing of EBG. Likewise in double patch, placing the EBG structures on either side of the corporate feedline improves the return loss by 2.5 dB and a 12% reduction in size is achieved when compared with customary positioning of EBG. Bandwidth improves by 4.82%. The antenna arrays, EBG structures at the feedline considerably reduce side lobe level and back lobe level and improve directivity, because of optimal radiation patterns. Simulations are validated experimentally.