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This article presents the results of a novel and compact ultra-wideband dual-notch microstrip antenna excited using a coplanar waveguide feed. The antenna is comprised of two circular radiation patches with a rectangular slot to enhance its impedance bandwidth and two open-circuit stubs that generate high attenuation notches at the desired frequencies. The notch frequency can be controlled by changing the length of the stubs. The proposed antenna exhibits an impedance bandwidth of 123% from 2.45 to 10.3 GHz, significantly satisfying the Federal Communication Commission's ultra-wideband frequency range, while showing the band rejection performance in the frequency bands of 3.3 to 3.8 GHz and 5 to 5.9 GHz. The antenna was fabricated on a standard dielectric substrate, and its measured results are used to verify the simulated performance. The empirical results indicate that the proposed antenna is well suited to be integrated within various portable devices for ultra-wideband operation. [ABSTRACT FROM AUTHOR]

This paper presents a bandwidth increasing technique using a modified ground plane with diagonal edges for the design of compact antennas. The proposed low-cost, compact-size circular patch antenna on 3 cm x 5.1 cm printed circuit board (FR-4) is designed and validated through simulations and experiments. Results show that with diagonal cuts at corners of the ground plane, the enhanced bandwidth can be tunable depending on the removed area. Return losses of minus 17 and minus 30 dBs for the first and second resonant frequencies, respectively, can be achieved when the depth of the diagonal cut is at optimum value of five mm, providing an 18.13% wider bandwidth (2.95-12.615 GHz) than the Federal Communication Commission (FCC) standard. [ABSTRACT FROM AUTHOR]