Novel terahertz band broadband monolithic integrated subharmonic mixer

Abstract

The invention provides a novel terahertz band broadband monolithic integrated subharmonic mixer comprising radio frequency and a local oscillation signal loading coupler, a diode pair composed of two diodes reversely connected in parallel, an intermediate frequency output amplifier circuit and a low pass filter, wherein a radio frequency signal is filtered by a first coplanar waveguide through a radio frequency band stop filter with a 1 / 2 radio frequency signal wavelength and is imported by a second coplanar waveguide onto an intermediate pin of the diode pair; and a local oscillation signal is filtered by a third coplanar waveguide through a local oscillation band-pass filter with a 1 / 4 local oscillation signal wavelength and is imported by the second coplanar waveguide onto the intermediate pin of the diode pair to be mixed with the radio frequency signal. By adoption of the scheme, the ultra wide working frequency range of the terahertz monolithic integrated subharmonic mixer is realized, and the scheme has the performance indexes of low frequency conversion loss, low manufacturing cost and high port isolation, and the like.

Description

Technical field [0001] The invention belongs to the technical field of monolithic integrated sub-harmonic mixers, and in particular relates to a novel terahertz frequency band wideband monolithic integrated sub-harmonic mixer. Background technique [0002] As an important part of terahertz radar, communications, detection and testing instruments, mixers have always been an important research topic in the field of terahertz. With the continuous improvement of the requirements of various receiving systems for working bandwidth, test sensitivity and detection distance and other indicators, higher requirements are also put forward for the bandwidth, conversion loss and noise figure of the mixer. [0003] At present, there are mainly two implementation forms of monolithic integrated sub-harmonic mixers in the terahertz band: one is a sub-harmonic mixer based on the anti-parallel diode pair (APDP) structure, and the other It is a balanced sub-harmonic mixer based on FET / HEMT. Terahertz...

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Problems solved by technology

like figure 2 As shown, Yan Pingping from Southeast University designed a Ka monolithic integrated sub-harmonic mixer using three coupled lines. The resistance realizes the pump injection of the local oscillator signal, so that the power consumption of the local oscillator signal is relatively large at 15dBm

The above two topologies are both second harmonic mixers, and the frequency of the local oscillator signal is half of the frequency of the RF signal. In order to ensure low-loss transmission of the RF signal, the length of the coupler used is a quarter of the wavelength of the RF signal. The length is one-eighth of the wavelength of the local oscillator signal, so an additional resistor is required to realize the feed-in of the local oscillator signal, and the insertion loss of the local oscillator signal is relatively large in this way

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