A compact dual-band microstrip patch antenna operating at 2.5 GHz and 3.5 GHz

ABSTRACT

This paper presents a new method to reduce mutual coupling between two closely-packed planar inverted antennas with split

ring resonator (SRR). A SRR structure has been inserted between the two elements. The design model has been analyzed and optimized

with  the  commercial  software  package  HFSS  14.0,  thus a  mutual  coupling  reduction  of  more than  6 dB  was  achieved  at  resonant

frequency.

This paper presents a new method to reduce mutual coupling between two closely-packed planar inverted antennas with split

ring resonator (SRR). A SRR structure has been inserted between the two elements. The design model has been analyzed and optimized

with  the  commercial  software  package  HFSS  14.0,  thus a  mutual  coupling  reduction  of  more than  6 dB  was  achieved  at  resonant

frequency.

This paper presents a new method to reduce mutual coupling between two closely-packed planar inverted antennas with split

ring resonator (SRR). A SRR structure has been inserted between the two elements. The design model has been analyzed and optimized

with  the  commercial  software  package  HFSS  14.0,  thus a  mutual  coupling  reduction  of  more than  6 dB  was  achieved  at  resonant

frequency.

This paper presents a new method to reduce mutual coupling between two closely-packed planar inverted antennas with split

ring resonator (SRR). A SRR structure has been inserted between the two elements. The design model has been analyzed and optimized

with  the  commercial  software  package  HFSS  14.0,  thus a  mutual  coupling  reduction  of  more than  6 dB  was  achieved  at  resonant

frequency.

This paper presents a new method to reduce mutual coupling between two closely-packed planar inverted antennas with split

ring resonator (SRR). A SRR structure has been inserted between the two elements. The design model has been analyzed and optimized

with  the  commercial  software  package  HFSS  14.0,  thus a  mutual  coupling  reduction  of  more than  6 dB  was  achieved  at  resonant

frequency.

A compact dual-band microstrip patch antenna operating at 2.5 GHz and 3.5 GHz is presented in this work for modern wireless communication applications such as WiMAX and sub-6 GHz systems. The proposed antenna is implemented on a single dielectric substrate and is based on a conventional rectangular microstrip patch initially designed to resonate at 2.5 GHz. To achieve dual-band operation without increasing antenna size or complexity, a defected ground structure (DGS) is introduced by etching a circular slot in the ground plane. The circular ground slot perturbs the surface current distribution, effectively increasing the inductive and capacitive characteristics of the antenna, which leads to the excitation of an additional resonant mode around 3.5 GHz. Parametric analysis is carried out to investigate the influence of the circular slot dimensions and position on impedance matching and resonant frequencies. Simulation results demonstrate that the proposed antenna exhibits good impedance matching at both operating bands, with adequate impedance bandwidths covering the targeted frequency ranges. Stable radiation characteristics and satisfactory gain performance are observed at both resonant frequencies. Compared to conventional single-band patch antennas and rectangular-slot-based DGS designs, the proposed circular-slot configuration offers improved design flexibility and compactness. Owing to its simple structure, single-layer implementation, and dual-band performance, the proposed antenna is well suited for integration into modern wireless communication devices.

Keywords— Dual-band antenna, Microstrip patch antenna, Defected ground structure (DGS), Circular slot, WiMAX, 2.5 GHz, 3.5 GHz, Impedance bandwidth