Design of a Shared U-Shaped Single Radiator with Multiple Patterns Antenna for UWB Monopulse Systems

초록

This paper proposes a single radiator with multiple patterns (SRMP) antenna for miniaturized ultrawideband (UWB) positioning systems. The proposed antenna combines three U-shaped monopole antennas into a single radiator to minimize mounting space. The shared U-shaped monopole antenna is fed by three printed coplanar waveguides with grounds (CPWGs) arranged in a circular configuration. To improve matching characteristics, shorting pins are applied parallel to the inner conductor, maintaining a circular arrangement around the junction between the inner conductor of the CPWGs and the ports. The measured reflection coefficient of Port 1 is calculated to be less than ‒10 dB from 7.4 GHz to 9 GHz, while the measured mutual coupling is less than ‒8 dB within the observation range of 7 GHz to 9 GHz. At 8 GHz, the measured boresight gain is 1.4 dBi. Furthermore, the measured radiation patterns are observed to be in good agreement with the simulated results in the zx- and xy-planes, respectively. In addition, the monopulse ratio in the xy-plane has a root-meansquare error of 0.077. These results demonstrate that the proposed SRMP antenna is suitable for use in UWB positioning systems in electronic devices.

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