Torabi Elahehsadat, Erricolo Danilo, Chen Pai-Yen, Fuscaldo Walter, Beccherelli Romeo
Opt Express. 2022 Aug 1;30(16):28966-28983. doi: 10.1364/OE.464811.
An original liquid crystal (LC)-based substrate integrated waveguide (SIW) leaky-wave antenna is proposed. Inside the SIW, there is an embedded stripline sandwiched between an LC pool and another dielectric slab. The antenna couples the guided quasi-TEM mode into free space through a periodic set of complementary electric inductive-capacitive (cELC) resonators. Simulation results show that the antenna performs fixed-frequency continuous beam steering of 52° from backward -28° to forward 24° at 25.85 GHz. This relatively wide beam scan angle is achieved by tuning the LC permittivity through an applied quasi-DC bias voltage to the stripline. Simulation results show that the antenna has high realized gain through the entire scanning range (less than 1 dB degradation), relatively wide bandwidth, and good tolerance to frequency drift and fabrication errors.
提出了一种基于原始液晶（LC）的基片集成波导（SIW）漏波天线。在SIW内部，有一条嵌入式带状线夹在一个LC池和另一个介质板之间。该天线通过一组周期性的互补电感电容（cELC）谐振器将导行准TEM模耦合到自由空间。仿真结果表明，该天线在25.85GHz频率下实现了从后向-28°到前向24°的52°固定频率连续波束扫描。通过向带状线施加准直流偏置电压来调节LC介电常数，从而实现了相对较宽的波束扫描角度。仿真结果表明，该天线在整个扫描范围内具有较高的实现增益（增益下降小于1dB）、相对较宽的带宽以及对频率漂移和制造误差的良好容忍度。
