THz wave rapid modulator based on coplanar waveguide combined transistor

Abstract

The invention discloses a THz wave rapid modulator based on a coplanar waveguide combined transistor and belongs to the technical field of electromagnetic functional devices. The THz wave rapid modulator is mainly used for rapid dynamic functional devices at the THz wave band. THz waves are introduced through a straight waveguide cavity; then, the THz waves are coupled to a structure of the core part, namely, a transistor combined coplanar waveguide (CPW) of the modulator through a probe structure, wherein the structure is composed of the suspended coplanar waveguide and a Metamaterials unit and HEMT nested complex structure modulation unit array structure, the suspended coplanar waveguide is formed by combining three metal wires and a semiconductor substrate, and the Metamaterials unit and HEMT nested complex structure modulation unit array structure is added between adjacent metal transmission bands of the coplanar waveguide. The transmission characteristic of the THz waves in the CPW is changed by controlling on-off of modulation units, then rapid amplitude and phase modulation of the THz waves is achieved, and finally the modulated THz waves are transmitted out through the probe-waveguide structure. Effective, efficient and rapid amplitude modulation of the THz waves can be achieved.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic functional devices, focusing on fast dynamic functional devices in the terahertz band, which are used for terahertz wave modulators, terahertz wave switches, and terahertz shifters. Background technique [0002] As one of the most critical core technologies in terahertz communication systems, terahertz wave dynamic functional devices—terahertz external modulators have become the focus of terahertz science and technology research. At present, quasi-optical methods are used to study terahertz external modulators in the world, but this method has large insertion loss, many unit structures, and difficult to increase the modulation rate. Rapid modulation of Hertzian waves. Patent 201510894480.5 discloses a fast terahertz wave modulator based on a coplanar waveguide combined with a transistor, including: an input straight waveguide, a coplanar waveguide, and an output straight waveguide; the co...

AI Technical Summary

Problems solved by technology

However, the modulation unit used in this modulator is a single transistor combined with a resonant unit structure, and the modulation rate is limited by the working efficiency of the transistor itself.

And the structure is a simple dipole oscillating structure with a low modulation depth; there are few parameters that can be designed and modified, and the resonance position will be shifted due to assembly errors during processing.

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