期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 69, 期 11, 页码 7521-7531出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2021.3076669
关键词
Antenna arrays; Metasurfaces; Wideband; Propagation losses; Substrates; Surface waves; Lenses; Dual-layer; high-gain; Huygens' metasurface; multibeam; Rotman lens; slot antenna array; substrate-integrated waveguide (SIW); wideband
资金
- National Natural Science Foundation of China [61971098, U19A2055]
- National Key Research and Development Project [2020YFB1805003]
- Fund of Science and Technology on Electromagnetic Scattering Laboratory [61424090410]
A wideband dual-layer Huygens' unit cell based on offset electric dipole pair (OEDP) is proposed in the paper, which achieves wideband transmission by utilizing only electric polarizabilities and avoiding unbalanced resonant frequencies. A wideband and high-gain multibeam array antenna is developed based on this unit cell, which includes a Rotman lens, a parallel-fed slot antenna array, and a Huygens' metasurface, operating within a relatively wide bandwidth (28-32 GHz) and increasing antenna gain further. Performance verification is done by fabricating a prototype and comparing measured results to simulated counterparts.
A wideband dual-layer Huygens' unit cell based on offset electric dipole pair (OEDP) is proposed. Different from traditional designs with a combination of electric and magnetic polarizabilities, the proposed Huygens' unit cell exclusively employs electric polarizabilities. By doing so, it practically avoids the unbalanced resonant frequencies between the two polarizabilities, thereby achieving wideband transmission. Based on the proposed unit cell, a wideband and high-gain multibeam array antenna is developed. First, a Rotman lens is designed by using a substrate-integrated waveguide (SIW) technology. Then a parallel-fed slot antenna array is connected to the Rotman lens to generate multiple beams. Without using a series-fed slot antenna array, the multibeam array antenna based on Rotman lens can operate within a relatively wide bandwidth (28-32 GHz). Second, a wideband dual-layer Huygens' metasurface is developed that serves as a superstrate of the multibeam array antenna for increasing the antenna gain further. A wideband and high-gain multibeam array antenna is finally realized, which is comprised of a Rotman lens, a parallel-fed slot antenna array, and a Huygens' metasurface. To verify the performance of this design, a prototype is fabricated and its measured results are compared to the simulated counterparts.
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