Abstract
This paper proposes a novel sub-harmonic mixing topology. Based on the proposed topology and the precise three-dimensional electromagnetic model of the Schottky barrier diode; a novel 183 GHz solid-state sub-harmonic mixer is designed and measured. By adding a compact low-pass filter near the ground of the mixer’s circuit, the effect on the mixer’s RF performance of the random error of the conductive adhesive in assembling is effectively decreased. The test results show that the optimal single-sideband conversion loss of the mixer is 8.1dB@183GHz when the local oscillator signal is 4mw@91GHz. In the RF bandwidth from 173 GHz to 191 GHz, the single-sideband conversion loss is less than −10.6 dB. At the same time, the RF port return loss is less than 9.8 dB.
Highlights
A solid-state terahertz mixer is one of the key components of the terahertz system, which has been widely used in the fields of remote sensing, communication, and radar
To verify the novel topology proposed in this paper, we used the mixer designed before as Towhich verify is theworking novel topology topology proposed in this this paper, paper, weisused used the mixer mixer designed designed before as comparisonTo at the same frequency
low-pass filter and (LPF) in before the topology, as verify the novel proposed in we the as comparison which is working at the same frequency
Summary
A solid-state terahertz mixer is one of the key components of the terahertz system, which has been widely used in the fields of remote sensing, communication, and radar. 183 GHz is an important frequency window of atmosphere water vapor absorption, which has been widely used in remote sensing and atmosphere limb detection [5,6,7]. The solid-state terahertz receiving system can work at room temperature and does not require refrigeration equipment, which can effectively reduce the volume and weight of the satellite load. The heterodyne architecture is widely used in the terahertz radiometer receivers, and the sub-harmonic mixing method is commonly utilized [10,11,12,13]. Based on the anti-parallel Schottky diode developed by Teratech, a novel 183 GHz solid-state sub-harmonic mixer is designed and measured in this paper. In order to verify the effectiveness of the proposed mixing architecture, simulation, measurement, and comparison are performed based on a mixer working at the same frequency with no grounding. Two same mixers are assembled of each topology, and the variation on conversion loss and RF return loss is tested and analyzed
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