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2018•Unpublished venueRequires access

Low-VSWR Ultra Wideband Monopole Antenna Possessing Optimized Ground-Plane Contours

Ryo Mitera, Takehiko Kobayashi

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Abstract

Optimization of ground plane contours was carried out to realize a very low voltage-standing-wave-ratio (VSWR) omnidirectional-in-azimuth monopole antenna between 3.1 and 10.6 GHz ultra wideband (UWB) bandwidth. The authors previously developed a low-VSWR (less than 1.3 for 3.1 to 10.6 GHz) UWB monopole antenna, consisting of a flat circular ground plane and a teardrop-shaped monopole that is defined as a combination of a finite cone and a sphere inscribed inside the cone. The half-cone angle was optimized to minimize the highest VSWR between 3.1 and 10.6 GHz. In this paper, the contours of a circular ground plane were numerically optimized based on a genetic algorithm and a trust region framework to realize the lower VSWR. A prototype was constructed to validate the design: VSWR <;1.2 was achieved between 3.1 and 10.6 GHz.

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What this paper is about

Optimization of ground plane contours was carried out to realize a very low voltage-standing-wave-ratio (VSWR) omnidirectional-in-azimuth monopole antenna between 3.1 and 10.6 GHz ultra wideband (UWB) bandwidth. The authors previously developed a low-VSWR (less than 1.3 for 3.1 to 10.6 GHz) UWB monopole antenna, consisting of a flat circular ground plane and a teardrop-shaped monopole that is defined as a combination of a finite cone and a sphere inscribed inside the cone. The half-cone angle was optimized to minimize the highest VSWR between 3.1 and 10.6 GHz. In this paper, the contours of a circular ground plane were numerically optimized based on a genetic algorithm and a trust region framework to realize the lower VSWR. A prototype was constructed to validate the design: VSWR <;1.2 was achieved between 3.1 and 10.6 GHz.

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Available abstract

Optimization of ground plane contours was carried out to realize a very low voltage-standing-wave-ratio (VSWR) omnidirectional-in-azimuth monopole antenna between 3.1 and 10.6 GHz ultra wideband (UWB) bandwidth. The authors previously developed a low-VSWR (less than 1.3 for 3.1 to 10.6 GHz) UWB monopole antenna, consisting of a flat circular ground plane and a teardrop-shaped monopole that is defined as a combination of a finite cone and a sphere inscribed inside the cone. The half-cone angle was optimized to minimize the highest VSWR between 3.1 and 10.6 GHz. In this paper, the contours of a circular ground plane were numerically optimized based on a genetic algorithm and a trust region framework to realize the lower VSWR. A prototype was constructed to validate the design: VSWR <;1.2 was achieved between 3.1 and 10.6 GHz.

Key concepts: Ground plane, Standing wave ratio, Monopole antenna, Omnidirectional antenna, Magnetic monopole, Helical antenna, Physics, Wideband

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