Guan Yalin

An investigation of statistical distribution properties in reverberation chamber

In the paper, the measurements for statistical model in the reverberation chamber (RC) are presented. The model of probability density function (PDF) is studied. The results of measurements are analyzed with respect to the corresponding ideal theoretical model. The function is observed over a frequency range that allows for the conditions in the chamber to vary from under-moded operation to overmoded operation (1 GHz- 9 GHz). Ultimately, the paper states that the distribution of the field power density at the certain position in the RC fits a Weibull distribution.

Three new strip-line TEM cells in EMC test

The strip-line TEM cell is used to measure the EMC of equipment and devices. Strip-line TEM cell can be widely used in measuring the EMC (Electromagnetic Compatibility) performance from automotive industry to IC components. In this paper we present three different strip-line TEM cells. And cut slot on conductor can extend the frequency range of strip-line TEM cell. The cost is lower, the operation is easier, and the cell is more applicability with this method.

A DPSK modulation OTDM system at 40Gbps

Optical Time Division Multiplexing (OTDM) is one of the effective methods to improve the transmission rate of optical communications [1]. Optical communications researchers use optical method to convert electric time division-multiplexing signal into higher rate optical signal. OTDM system overcomes the limited rate of electronic communication [7]. In this paper, we simulate and design a point to point 40Gbps OTDM system by using OptiSystem, and use DPSK (Differential Phase-Shift Keying) modulation format in this system. It achieves efficient and reliable transmission of data which satisfies an ever-growing demand for bandwidth of high-speed optical fiber communications.

The design of diversity receiving in Rerverberation Chamber

In this paper, the diversity techniques in reverberation chamber is firstly presented. With the introduction of space diversity, by using multi-receiving antenna, we can get more effective signals and greatly reduce the variance. Through comparing the results of non-diversity with the ones of diversity, it is tested that diversity techniques can improve the signal variance of Reverberation Chamber.

Research on low reflection Material of double layer medium structure

Low reflection material is very useful in many applications. At present, the operation frequency in the most absorbing materials are above 4 GHz, for it is difficult to realize the low reflection below 4 GHz with thin structure. A thin structure material that realize the low reflection was studied by using the analog circuit method in this issue. A genetic algorithm is used to find the optimization parameter. The simulations by equivalent circuit and FEM methods show a low reflection between 2 GHz and 9 GHz, which is only 9 mm thick and the value of reflection loss is lower than -6 dB.