Abstract
In this paper, a low-profile, broadband metasurface antenna for polarization conversion is proposed based on characteristic mode analysis (CMA). A new type of metasurface unit with a partially chamfered symmetrical triangular structure is designed. The inherent physical characteristics of the antenna are analyzed based on CMA, and the expected characteristic modes are selected for excitation at a suitable position. Slot-coupled feeding via microstrip line realizes the performance of wide impedance bandwidth and axial ratio bandwidth (ARBW). The measured -10 dB impedance bandwidth of 36.3% (4.38–6.32 GHz) and the 3 dB ARBW of 20.1% (5.41–6.62 GHz) are achieved. The left-hand circular polarization (LHCP) is realized, and the measured highest gain in the working frequency band is 6.05 dBic. The overall size of the designed and fabricated metasurface antenna is 0.58 λ0 × 0.58 λ0 × 0.07 λ0at 5 GHz. The proposed metasurface antenna can be well used in C-band satellite communications due to its low profile, broadband, and circular polarization.
Highlights
In recent years, with the continuous development of wireless communication technology, the antenna as an important part of the communication system has attracted more and more scholars to invest in related research
Metasurface antennas have been applied to circular polarization (CP) antenna design by more and more scholars to improve the impedance bandwidth, axial ratio bandwidth (ARBW), and the gain of the antenna [6, 7]
The phases of the modal weighting coefficient (MWC) of the five modes are shown in Figure 6B and the phase difference between Mode 1′ and Mode 4′ is shown in Figure 6C, and the results show that the antenna structure has the condition to achieve CP
Summary
With the continuous development of wireless communication technology, the antenna as an important part of the communication system has attracted more and more scholars to invest in related research. Traditional microstrip patch antennas are used in many scenarios because of their low profile, simple structure, easy fabrication, and easy integration [3,4,5]. As the requirements for antennas become higher and higher, microstrip patch antennas are difficult to meet the needs of modern communications because of their narrow impedance bandwidth and low gain. Metasurface antenna is expected to overcome such drawbacks as the traditional microstrip patch antenna. Metasurface antennas have been applied to CP antenna design by more and more scholars to improve the impedance bandwidth, axial ratio bandwidth (ARBW), and the gain of the antenna [6, 7]. The high gain was achieved, the impedance bandwidth and ARBW
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