Effects of a smaller unit cell planar EBG structure on the mutual coupling of a printed dipole array

Abstract

Abstract-A new smaller unit-cell planar electromagnetic bandgap (EBG) structure is proposed on low dielectric constant low-cost substrate (TMM: r = 4 5 thickness = 25 mils) that has a stopband frequency at around 4 GHz. The proposed structure when placed in between a two-element printed dipole array results in over 13-dB reduction in mutual coupling and a significant improvement in antenna return loss bandwidth and gain pattern.Index Terms-Antenna array, mutual coupling, planar electromagnetic bandgap (EBG), surface wave.

Compact Ebg Structure for Alleviating Mutual Coupling Between Patch Antenna Array Elements

“…Reported other studies showed mutual coupling reduction by −13 dB at 4.18 GHz [16] and 20.5 dB at 12.2 GHz with two different uni-planar EBG arrays [34], and approximately 4 dB at 5.2 GHz with different shapes (H, I, X etc.) of planar designs [35].…”

“…The coupling depends on the element separation and their orientation which causes scan blindness and forms blind spots. By increasing the element separation, mutual coupling can be lessened, but this would introduce undesirable grating lobes [16][17][18].…”

“…of planar designs [35]. A 17 dB reduction of mutual coupling is noticed with a dual-layer configuration [36] while it is only 10 dB for a multi-layer [24] and 13 dB for a single layer [16] configuration. In [37], a dual band split-ring slotted (SRS)-EBG structure is proposed which reduced the mutual coupling by 20 dB at 13 GHz.…”

A Miniature Spiral Diversity Antenna System With High Overall Gain Coverage and Low SAR

“…Note that if the antenna size is larger than the proposed spiral PIFA or that if the antennas are placed much closer to each other or both, then the isolation will degrade. To solve such a problem, one may introduce slits on the ground plane [9] or use engineered structures [10] if the design scenario permits such adjustments.…”

Design of Antennas for RFID Application

“…16. Similar tag antenna can also be designed based on the EBG structure (Abedin & Ali, 2005aYang & Rahmat-Samii, 2003) like the tag antenna shown in Fig. 12.…”