A 340ghz and 450ghz Broadband Duplexer Based on Thin Film Devices

Abstract

The invention discloses a thin film device-based 340GHz and 450GHz wideband duplexer. The duplexer comprises a wave absorption cavity, a polarization isolator, two polarization converters, a pair of transceiving reciprocal horn antennas and a pair of antenna supports, wherein the two polarization converters respectively work in different frequency bands, the wave absorption cavity is a waveguide cavity with T-shaped appearance, a thin film with a metal line optical grating is arranged at one side of the polarization isolator, the polarization isolator is fixedly arranged at a penetrating position of a horizontal segment and a vertical segment of the wave absorption cavity and forms an angle of 45 degrees with the horizontal segment, thin films are attached onto surfaces of two sides of each polarization converter, a periodic metal unit array is arranged on an outer surface of each thin film, a metal unit is a rectangular metal thin sheet penetrating through the surface of the thin film, a row of square metal thin sheets are uniformly arranged between two adjacent rectangular metal thin sheets, and the two polarization converts incline at certain angles and are fixedly arranged in the horizontal segment of the wave absorption cavity. By the duplexer, the problem of signal transceiving isolation of the same frequency point can be solved very well.

Description

technical field [0001] The invention belongs to the technical field of radar and communication, and in particular relates to a 340GHz and 450GHz broadband duplexer based on a thin-film device. Background technique [0002] In a wireless system, the transmitter works at ultra-high power, while the receiver works at ultra-low power. When it is necessary to send and receive information at the same place, how to ensure that the power of the transmitter does not enter the receiver and cause the receiver to burn out is a guarantee for the system. A necessary condition for normal operation, the device that realizes this function becomes a duplexer. The duplexers in the low-frequency microwave band mainly include waveguide duplexers, coaxial duplexers, dielectric duplexers, surface acoustic wave (Surface Acoustic Wave-SAW) duplexers, and microstrip duplexers. Due to the limited manufacturing process, it is extremely difficult to realize the duplexer in the terahertz band. At presen...

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Problems solved by technology

The main types are: based on optical beam splitter transceiver isolation, although this method is simple and low cost, but the transmission loss of the signal path is large, the isolation is low; based on the quasi-optical duplexing method based on the Faraday rotator whose outgoing wave is linearly polarized However, as the frequency increases, the loss caused by the Faraday polarization rotating plate will increase, and the isolation is generally at a maximum of about 40dB. The outgoing wave is linearly polarized, and the echo signal-to-noise ratio is low when irradiating complex objects; Quasi-optical duplexers based on reflective polarization converters and transmissive polarization converters, among which the outstanding advantages of quasi-optical duplexers based on reflective polarization converters are low transmission loss and high isolation, but their work The bandwidth is narrow, and it has high requirements on the placement angle and electromagnetic wave incident angle. The quasi-optical duplexer based on the transmissive polarization converter can effectively overcome these shortcomings, but the design and processing of the high-performance transmissive polarization converter It is more difficult in the millimeter wave and terahertz frequency bands, and due to the small feature size of the device and the lack of effective absorbing materials, it is very easy to generate electromagnetic wave diffraction at the edge of the device

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