Compact quasi-self-complementary antenna for portable UWB applications

作者:Zou, Jinze; Liu, Li; Cheung, S. W. 刊名:Microwave and Optical Technology Letters 上传者:孟儒

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respectively. In Figure 10, the length of the slits present along the diagonal PR is varied keeping the slits length at the other diagonal QS constant as 10.5 mm. In the same manner, the vari-ation of S11 with frequency for different widths of the slits is also shown keeping slits at the diagonal PR and QS as 12.5 and 10.5 mm, respectively. The resonance frequency of antenna 3 decreases with increase in length and width of the corner slits for entire band of operation in CP region. The total radiated power of the proposed antenna 3 is shown in Figure 12. The sense of rotation can be changed by simply changing the position of feed along another diagonal of the square patch. Total radiated power remains same with change in frequency. Both the antennas show stable radiation characteris-tics in both E-plane and H-plane. More than 23 dB power is achieved within angle of 170 in E-plane and 130 in H-plane. Both the antennas have almost same radiation characteristics. 4. CONCLUSION Compact circularly polarized microstrip antennas have been designed and fabricated. When compared with the conventional design of circularly polarized microstrip antenna, the proposed antenna is 42% compact in size maintaining good CP. The proposed antenna may be a good choice for indoor WLAN applications which require small antenna with CP to mitigate multipath fading in wireless communication environment. ACKNOWLEDGMENT The authors gratefully acknowledge the support provided by the Department of Science

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