期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 70, 期 9, 页码 8566-8571出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2022.3168711
关键词
Microstrip antennas; Antenna radiation patterns; Microstrip; Substrates; Resonant frequency; Antennas; Permittivity; Annular ring; microstrip antenna; omnidirectional antenna; ripple; superstrate
资金
- National Natural Science Foundation of China [62101133, 61771277]
- Natural Science Foundation of Shanghai [21ZR1406800]
- National Key Research and Development Program of China [2017YFA0700203]
A new method of embedding an annular ring into the superstrate is proposed to reduce the negative effect of the superstrate on the microstrip omnidirectional antenna. The working mechanism of the annular ring is analyzed and an equivalent model is established to determine its dimensions. Experimental results show that the proposed method effectively mitigates the negative effects of ripples in the radiation pattern and reduces the radiation at the lower hemisphere. It can serve as a promising candidate in practical applications without the need for optimizing the superstrate's parameters.
In this communication, a new method of embedding an annular ring into the superstrate is proposed and studied to reduce the negative effect of the superstrate on the microstrip omnidirectional antenna. The working mechanism of the annular ring is analyzed based on the E-field distributions and an equivalent model that can approximately determine the dimensions of the annular ring. The effect of the parameters of the superstrate and the annular ring on the antenna performance is analyzed to verify the equivalent model. With the help of the annular ring, the negative effect of deep ripples in the radiation pattern, the strong radiation at the lower hemisphere, and the sensitiveness of the radiation pattern to the ground size from the superstrate are mitigated. A fabricated prototype shows that the measured -10 dB impedance bandwidth is 0.7 GHz (12.9-13.6 GHz). Within the frequency range of 13-13.8 GHz, the measured radiation patterns have no deep ripples and the measured radiation at the lower hemisphere is weak. The proposed method of embedding an annular ring to the superstrate, which does not involve the optimization of superstrate's parameters, can serve as a promising candidate in practical applications.
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