A 200–240 GHz Sub-Harmonic Mixer Based on Half-Subdivision and Half-Global Design Method

Abstract

For the terahertz harmonic mixer, a design model based on Half-Subdivision and Half-Global Design Method (HS-HGDM) with a single functional unit is proposed. The single functional unit circuit of the mixer, such as LO or IF Low Pass Filter (LPF), is designed by Subdivision Design Method (SDM), and the rest circuits of the mixer are designed by Global Design Method (GDM). The harmonic mixer based on this model is characterized by simple circuit structure, low conversion loss, small circuit size and high stability. In this paper, an improved Compact Suspended Micro-strip Resonators (CSMRs) filter is developed for the IF part of sub-harmonic mixer. The remaining circuits consist of some basic transmission units, such as the High-Z Low-Z impedance Transmission Lines (H-Z L-Z TLs) applied for main circuit, and full/reduced height WR4.3/WR8 applied for providing RF/LO signal. In RF frequency range 200-240 GHz, a Single Sideband (SSB) conversion loss of 7.36±0.76 dB operating at IF frequency 1.8 GHz, and a Double Sideband (DSB) noise temperature below 1034 K with the LO power of 2-5 mW and the LO frequency of 107 GHz were achieved. This broadband sub-harmonic mixer operates at room temperature, which makes it applicable to sub-millimeter wave or terahertz wireless communication systems and imaging inspection systems. INDEX TERMS Terahertz sub-harmonic mixer, CSMRs filter, wireless communication systems.

340 and 250 GHz Schottky solid‐state heterodyne receiver arrays for passive imaging systems

“…The measured data indicates the DSB noise temperature is below 1100 K for the 340 GHz mixer from 330 to 350 GHz and 800 K for the 250 GHz mixer from 240 to 260 GHz and the average DSB conversion loss is 7 dB (antenna loss included for all measured results). It should be noted that the SHM in this paper holds comparable performance compared with the best-published results, [8][9][10][11][12] which are listed in Table 1.…”

Port‐assignment modelling of anti‐parallel Schottky barrier diode and 0.3‐THz sub‐harmonic mixer design

“…Here, the intrinsic diode represents a non-linear term and the 3D EM file represents a linear parasitic term, separately. To separate the linear and non-linear parts for behaviour modelling of AP-SBDs, the internal port-assignment method has been introduced in several studies [1][2][3][4]. These techniques include single port-assignment method with a micro-coaxial probe as illustrated in Figure 2a, which was proposed by Hesler in 1996 [4], and has been used as an ideal solution in the terahertz region.…”

High Output Power 340GHz Frequency Doubler Design Based on Linear Optimization Method

“…The Global Design Method (GDM) [33] deconstructs the entire circuit into a series of variables that can be optimized, increasing the degree of freedom for optimization but also the computational load, requiring substantial system resources. The Half-Global Design Method (HGDM) [34] merges these strategies, balancing computational load with optimization exibility. However, regardless of how 3D-EM is segmented into units in these mentioned design methods, the nal simulation optimization still occurs within harmonic balance simulation software, thus the simulation speed is constrained by the speed of harmonic balance simulations.…”