Deng Xianjin

110–170GHz sub-harmonic mixer based on Schottky barrier diodes

A fixed-tuned 110-170GHz sub-harmonic mixer based on planar low parasitic anti-parallel Schottky barrier diodes (SBD) is presented in this paper. Wideband diplexer and waveguide probe is designed. The diode is matched to optimized embedding impedance. Measured data indicates the mixer has detecting frequency from 110-170GHz, with Local Oscillator (LO) frequency turned from 60-80GHz. The 3dB Inter-frequency (IF) bandwidth is about 17GHz. Single Side Band (SSB) conversion loss is 12-14dB. Estimated Double Side Band (DSB) is about 400K.

140GHz waveguide H ladder bandpass filter

A low insertion loss 140GHz rectangular waveguide H ladder bandpass filter is presented in this paper. The filter is synthesized by 7-pole Chebyshev filtering function and simulated by mode matching method. It is fabricated based on micrometer precision high speed CNC milling machines. The measured center frequency is 139.2GHz. The 3dB bandwidth is 11.6GHz, 8.3%. The minimum insertion loss is -1.0dB. The passband return loss is lower than -16.4dB. The stopband rejection is -48.1dB at 130GHz.

Sub-terahertz wave frequency converter design for high speed data transmission

This paper presents a sub-terahertz wave frequency converter for high speed data transmission, which is composed of a V-band frequency source, a D-band harmonic mixer using Schottky diode. This converter can be used as an upconverter or downconverter between 110 and 170 GHz, which eliminates the need for high frequency LO source.