Incorporation of Oval-Slot and Arc-Slits Upon Planar Oval Monopole Antenna for Radiation Characteristics Improvement

This paper proposes the improvement of planar oval monopole antenna radiation characteristics by incorporating an oval-slot and arc-slits upon its radiating patch. The oval shape of the patch was obtained theoretically by determining a triangle-to-oval formula. A modification on the radiating patch by involving an oval slot geometrically scaled down from its dimensions is proposed to enhance the radiation characteristics. Moreover, two pairs of arc slits are also embedded into the patch for the enhancement. The modification stage is carried out through simulations in which experimental characterizations are used to validate the final configuration. The characterization is performed in an anechoic chamber in the frequency range of 1–20 GHz. The characterization results show that the incorporation of oval-slot and arc-slits into the radiating patch produces a reflection coefficient (S
11
) of around 34.78% for S
11
value between –10 dB to –20 dB. The proposed antenna configuration works at the frequency band of 1.38–20 GHz with two rejection bands of around the frequency ranges of 1.95–3.47 GHz and 9.08–9.55 GHz. The radiation patterns are measured at the frequencies of 5.66 GHz, 8.03 GHz, and 13.54 GHz to analyze the effect of improvement due to the modification. Furthermore, investigations on the distribution of surface current are also performed to determine the potency of modification offered for future developments.