基于脊波导结构的太赫兹超宽带双工器设计

Design of a terahertz ultra-wideband duplexer based on the ridge waveguide structure

摘要:

在射电天文领域，为了实现更宽频带内多谱线同时观测任务，要求太赫兹超导相干接收机向更宽带方向发展。针对下一代太赫兹超宽带接收机的应用需求，提出了一种频段覆盖180~ 420 GHz(相对带宽达87%)的超宽带脊波导双工器设计，主要包括：180~300 GHz频段和320~420 GHz频段宽带脊波导滤波器设计与变换；超宽带太赫兹多级耦合型脊波导双工器优化设计。仿真结果表明该结构能够在180~300 GHz和320~420 GHz频段双工工作，回波损耗整体优于15 dB，通道间隔离度达20 dB以上。

Abstract:

In radio astronomy field, the development of terahertz superconducting coherent receivers with ultra-wideband performance is required to achieve the simultaneous observation of multi-spectral lines in much wider frequency band. In response to the application requirements of the next-generation terahertz ultra-wideband receivers, an ultra-wideband ridge waveguide duplexer with a frequency band covering 180-420 GHz (the fractional bandwidth up to 87%) is developed. The main contents include the design and conversion of broadband ridge waveguide filters in 180-300 GHz and 320-420 GHz band, as well as the optimization of terahertz multi-stage coupled ridge waveguide duplexer. The simulation results show that this structure can be in duplex operation in the 180-300 GHz and 320-420 GHz bands with an overall return loss better than 15 dB and the isolation more than 20 dB.