Sun Zhen

Bio: Sun Zhen is an academic researcher from University of Electronic Science and Technology of China. The author has contributed to research in topics: Radiometer & W band. The author has an hindex of 2, co-authored 4 publications receiving 12 citations.

A W-band miniature power divider based on E-faced-folded magic-T junction

Abstract: A novel design of W-band power divider using E-faced-folded waveguide magic-T junction to realize the miniaturization is proposed in this paper. A stepped regular triangular prism and the stepped impedance transformer are utilized in order to obtain excellent performance. Besides, the performance of the E-faced-folded magic-T power divider is also improved by using short planes. The measured results show that the insertion loss of the power divider is better than 0.6dB and the return loss is better than 15dB. The measured average E-H isolation is better than 30dB from 92GHz to 100GHz range.

Millimeter wave high-resolution imaging medium lens antenna design method

Abstract: The invention discloses a millimeter wave high-resolution imaging medium lens antenna design method. The method is a design method combining optical lens design technology and millimeter wave antenna design theory, relating to the technical field of a millimeter wave antenna. By using an optical lens curved surface, the wave aberration and the geometrical aberration of a system are optimized by an optical design method, so that -3dB light spot diameter of feed source antenna units on an object plane is the smallest, and the gain inequality value of each feed source antenna unit is smaller than 1dB. The design method has the characteristics of simpleness and easy use, and the resolution ratio of the millimeter wave lens antenna is innovatively defined. The design method provided can be applied to a millimeter wave imaging system.

Multi-channel radiometer system front end and control method of consistency thereof

Abstract: The invention discloses a multi-channel radiometer system front end and a control method of consistency thereof. The multi-channel radiometer system front end consists of a plurality of single-channel radiometer front ends in an array way, wherein each single-channel radiometer front end comprises a radio frequency amplification and wave detection module, a video amplification module, an integral regulation module and a difference amplification and reference potential regulation module; the radio frequency amplification and wave detection module, the video amplification module, the integral regulation module and the difference amplification and reference potential regulation module are connected in turn; the output end of the difference amplification and reference potential regulation module outputs a voltage signal Vout. According to the multi-channel radiometer system front end, the problem of inconsistent multi-channel radiometer system front ends can be effectively solved, an external standard calibration source and an additional circuit structure are not required, and the multi-channel radiometer system front end has the advantages of small volume, high integration degree and simple technology.

W-band dual-channel direct detection radiometer front-end for array

Abstract: To ensure real-time functioning of radiometer system, the radiometer modules need to be arranged in array. In this paper, a highly integrated and miniaturized W-band dual-channel radiometer front-end with regular structure, good electromagnetic compatibility and temperature sensitivity is realized. For the integrated dual channel radiometer module, a series of debugging tests are implemented to improve the temperature drift and temperature sensitivity, and also to ensure the consistence of gain. When the transient time of the module is less than 1ms, the measured results show that the whole band has an apparent frequency response and its two channel temperature sensitivity can achieve 0.41K and 0.43K, respectively, which indicate that the dual channel module has good results. Simultaneously, the temperature recognition rate of the brightness temperature is 6.3mv/K and 6.18mv/K. The module meets the requirement of the radiometer system.

Method for preparing terahertz lens antenna group

Abstract: The present invention provides a method for preparing a terahertz lens antenna group. The method comprises: step 1) calculating an unknown external index of the lens antenna group; and step 2) placingthe imaging target point on the object plane of a lens, and obtaining an optimized lens antenna by using the size of the light spot of the image plane of a quadric surface single lens; step 3) continuing to increase the number of quadric single lenses, and continuing to optimize the added quadric surface single lens, to obtain the optimized lens antenna group; step 4) for the lens antenna group obtained in the step 3), performing the tolerance analysis on the lens antenna group by adopting the Monte Carlo method, if the diameter of the light spot at the edge of the image plane is 10 times orlarger than the diameter of the light spot at the center point of the image plane, and the beam uniformity is greater than 3dB, repeating the steps 1) to 3); and step 5) placing the known feed antennaon the image plane by using the electromagnetic simulation software FEKO, to determine whether the diameter of the light spot focused on the object plane and multi-beam gain difference meet the requirement of the regulations.

Micromachined W-band Eight-way Power Divider Based on Micro-coaxial Lines

Abstract: This paper presents a micromachined eight-way T-type power divider based on micro-coaxial lines. For ease of testing, two identical power dividers are placed in back-to-back configuration, and CPW to micro-coaxial line transitions are added at the input and output ports. The whole structure is directly measured using an on-wafer probe system. At 75–110 GHz, the measured return loss is better than 15 dB and the total insertion loss is 1–2 dB, showing excellent performance in terms of loss and phase balance. The divider can be widely used in power combined amplifiers and phased arrays.

Millimeter wave antenna

Abstract: The invention discloses a millimeter wave antenna. The antenna comprises a horn provided with a feed source, a lens and matching plates. The feed source is placed at one end, where the diameter is smaller, of the horn, and the lens and the matching plates are placed at the other end of the horn. The lens is made of polytetrafluoroethylene materials, and the curvature of the lens is not uniform, in other words, the curvature of the positions where the radii are the same is different and is decreased gradually from the center of the lens to the outside with increase of the radii. The matching plates are placed at the two sides of the polyfluortetraethylene lens. Each matching plate is a curved plate and comprises basic unresonance units and regular-hexagon-shaped metal frames which seem like honeycombs and are the same in size. By means of the millimeter wave antenna, millimeter waves can be received to the greatest extent, and meanwhile reflection of electromagnetic waves on the interface between the lens and air can be reduce. A motor is connected to the center of the lens. The millimeter wave antenna is simple in structure, low in production cost, convenient to carry and capable of enabling the millimeter wave frequency band ranging from 120 ghz to 200 ghz to be simpler in imaging technology.