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This paper presents the design and development of horizontal I-shape slots loaded on proximity coupled equilateral triangular microstrip antenna (HISPCETMSA) for quad band operation and omnidirectional radiation characteristics. The quad band frequency points are achieved between 2.75GHz to 9.23GHz. The magnitude of operating bandwidth has been enhanced to a maximum value of 14.77% in comparison to that of conventional microstrip antenna which resonates at 3GHz with bandwidth of 6.97%, bydoi:10.15623/ijret.2014.0315043 fatcat:biyzk4u2ibgmbpkvya3byfd7ri