Abstract
A wideband, low profile transmitarray antenna (TA) operating in Ku-band (12GHz-18GHz) is proposed. The transmitarray antenna is composed of aperiodic transmitarray units arranged periodically. The TA unit is mainly composed of three layers, which are composed of metals and substrates. Square patches are printed on the substrate of the top and bottom layers, and the middle layer is a Jerusalem slot in the ground. The overall thickness of TA unit is 0.165λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> (λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> is the free space wavelength at 15GHz). In Ku-band, the insertion of the TA unit is less than 0.5dB, which reduces the backward radiation of the transmitarray antenna. The 360° phase is achieved by changing the length of the patch and slot, and the proposed transmitarray unit has a flat phase curve and great transmission characteristics. In order to verify the proposed design, a transmitarray antenna with 351 TA units operating at 15GHz is fabricated and measured. The measurement results show that the TA can achieve a 37.3% (14.4GHz-20GHz) 1-dB gain bandwidth, the measurement gain is 23.06dBi with 42.3% aperture efficiency at 15GHz, and the backward radiation level is below -15dB. The designed TA unit has symmetrical structure, so the transmitarray antenna can work in dual linear polarization or dual circular polarization.
Highlights
Transmitarray antenna is a planar structure, which combines the advantages of lens antenna
Compared with other high gain antennas, it has the advantages of low processing cost, simple feeding and flexible functions, so it can be applied to radar, satellite communication, wireless systems [1]–[3], etc
A low profile wideband transmitarray is proposed, which is composed of periodically arranged transmitarray unit
Summary
Transmitarray antenna is a planar structure, which combines the advantages of lens antenna. Compared with other high gain antennas, it has the advantages of low processing cost, simple feeding and flexible functions, so it can be applied to radar, satellite communication, wireless systems [1]–[3], etc. Due to the narrow band limitation of the transmitarray unit and the different spatial phase delays at different frequencies, the transmitarray antenna has a narrow bandwidth. Recent studies have proposed many approaches to expand the operating frequency band of transmitarray antenna, which can be divided into the following three ways. The TA units at different positions of the transmitarray have the same structure shape, but different sizes, which are calculated according to the phase compensation of the units at that position. In [9], a semiplaner transmitarray is proposed, which maintains
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