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To study the antenna’s radiation patterns, two principle planes were selected. These are referred to as the x-z plane (H-plane) and the y-z plane (E-plane). Figures 4(a) through (d) show the normalized radiation patterns in the H- and E-planes for the antenna at 4, 6, 7, and 8 GHz, respectively. The results reveal that the antenna provides an acceptable quasi-omnidirectional radiation pattern suitable for receiving signals from all directions at lower frequencies. Due to antenna surface currents, however, its cross-polarization performance deteriorates with increasing frequency. Figure 5 plots the antenna’s measured peak gain as a function of operating frequency. Gain ranges from 3.3 to 10.1 dB in the measurement range from 2 to 14 GHz; gain across the full impedance bandwidth of 3.1 to 13.5 GHz always exceeds 3 dB, indicating that the antenna design is suitable for use in UWB systems.

Planar Antenna Aids UWB Communications, Fig. 4 (Top)

Planar Antenna Aids UWB Communications, Fig. 4 (Bottom)

Planar Antenna Aids UWB Communications, Fig. 5

In short, this compact monopole microstrip antenna shows promise for UWB applications. Following simulations with HFSS software, a prototype measuring just 32 x 26 mm was fabricated on FR-4 substrate. Simulations and measurements show an impedance bandwidth of 3.1 to 13.5 GHz, a bandwidth of more than 10 GHz for a VSWR of less than 2.0:1. The antenna has an acceptable quasi-omnidirectional radiation pattern required to receive information signals from all directions at lower frequencies. It is thus an attractive candidate for UWB communications applications.

Bo Gao, Lecturer

College of Communication Engineering, Jilin University, Changchun 130012, Jilin Province, People’s Republic of China.

Ge Wu, Engineer

College of Electronic Science and Engineering, Jilin University, Changchun 130012, Jilin Province, People’s Republic of China.

Jia-Yu Huo, Doctoral Student

College of Communication Engineering, Jilin University, Changchun 130012, Jilin Province, People’s Republic of China.

Xiao-Jian Tin, Professor

College of Electronic Science and Engineering, Jilin University, Changchun 130012, Jilin Province, People’s Republic of China.

Acknowledgments

This work was supported in part by the National Natural Science Foundation of China under Grant No. 60372061, and the Changchun Science and Technology Support Program under Grant No.11KZ36.

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