Qihui Zhou

The calculation and calibration of element mutual coupling in adaptive anti-interference antenna array

To calibrate the error caused by the mutual coupling between the elements of adaptive anti-interference antenna array, a novel calculation method is proposed in this paper. This method can solve out the mutual impedance matrix through a single comparison between the actual output and the theoretical input of the array by the Least Mean Square algorithm (LMS). To prove the validity of the method, four forms of microstrip antenna array are taken as examples, and the method of Finite-Difference Time-Domain (FDTD) is adopted to obtain the real output during the calibration procedure.

A wideband annular cylindrical dielectric resonator antenna for X-band applications

The present work investigates a novel cylindrical dielectric resonator antenna (CDRA) excited by a coaxial feed monopole, which is mounted on a circular substrate with a deformed ground plane. A vertical electric monopole is placed in the center of the DR. The wideband characteristic is achieved by the deformed ground plane. The features of the proposed antenna meet the essential requirements of X-band communication applications.

A dual-band energy selective surface with hexagonal spiral structure

In this article, a dual-band energy selective surface (ESS) which allows normal signal to pass and shields high power microwave (HPM) in the operating bands is designed. The ESS is consisted of hexagonal spiral patch and pin diode arrays. The state of pin diodes converts in the light of intensity of incident wave, and the ESS shapes reflective barrier to cut off HPM when diodes are off. The article evaluates the property of energy selectivity by measure the transmission coefficient of the ESS. Simulation results are presented and show that ESS has the ingredient of energy law pass over the frequency band from 3.45 GHz to 3.95 GHz and 8.3 GHz to 8.9 GHz, and the property is still reliable when the incident angle changes.