PROJECT TITLE :
Design of Compact, Low-Profile, Wideband, Dual-Frequency Patch Antennas Based on Complementary Co-Directional SRRs
A ancient microstrip antenna is capable of exhibiting smart dual-band operation via slotting a complementary codirectional split resonant ring (CCSRR) unit on the oblong radiating patch. Due to the advantage of low mutual coupling between the co-directional ring-slots in such a complementary co-directional split resonant ring unit, the antenna's operating frequency band, that originates from the complementary co-directional split resonant ring's resonance, is considerably expanded with the addition of additional co-directional ring-slots. Antennas comprised of zero, a single, twin, and triple complementary co-directional split resonant rings were designed, fabricated, measured, and comprehensively compared. In line with our investigation, besides operating in their inherent TM100 modes, the proposed antennas have the benefits of providing a lower and abundant wider operating range than that within the TM100 mode. This is especially more than a 9% impedance bandwidth, even with such a coffee profile (only zero.0316λzero in height). More importantly, uniformly good radiation characteristics, as well as excellent broadside main beams with high polarization purity, and large front-to-back ratios (FTBRs), were achieved in each frequency ranges, on the full.
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