Abstract
On the basis of the W-band power source, a single-stage frequency quadrupler method was used to implement two 335 GHz frequency quadruplers. The two frequency quadruplers adopted a traditional binomial matching structure and an improved gradient line matching structure, respectively. An idle loop was added to the overall circuit in the design of the DC filter and low-pass filter. The improved gradient line matching structure reduced the circuit length while increasing the bandwidth, effectively reducing the power loss on the transmission line. A micro-strip circuit was fabricated with a 50 μm thick quartz circuit and was mounted onto a split waveguide block. The results showed that the output power of the quadrupler with the improved matching structure was better than that of the quadrupler with the conventional matching structure. The peak output power of the improved frequency quadrupler was 4.75 mW at 333 GHz when driven with 200 mW. In contrast, this improved structure broadened the bandwidth by 8 GHz and reduced the length of the substrate by 0.607 mm, effectively reducing the length of the traditionally designed circuit by 11.5%.
Highlights
The terahertz band, which spans the gap between infrared and millimeter waves, has been a very valuable research field in recent years
Through the research in recent years, many results have been achieved in the field of solid-state frequency multiplication [7,8,9,10,11,12]
The required passband and stopband could be achieved by changing the length and width of each section by adjusting the capacitance and inductance values
Summary
The terahertz band, which spans the gap between infrared and millimeter waves, has been a very valuable research field in recent years. It has broad application prospects in radio astronomy, broadband communication, global water cycle observations, object imaging, marine environmental monitoring, etc. It has become the main method to obtain terahertz signal sources [6] In this method, the nonlinear effects of solid-state devices are used to generate each harmonic of the fundamental input wave, and the required harmonic components are extracted by filters, so as to reduce the main oscillation frequency of the system. By comparing the measured results of the frequency multiplier to the traditional binomial matching structure, the superiority of the gradient line matching structure is verified
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