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Usually, the stray signals from antenna test environment and compact antenna test range (CATR) system may cause errors in the measured patterns. In order to improve the measurement accuracy of a specific antenna test system, the techniques about antenna pattern correction for mitigating the effects of these stray signals are required. In this paper, a two-unit virtual array method and its extended...
A tri-reflector Compact Antenna Test Range (CATR) system which operates at 300GHz is modeled and verified in this work. An efficient Gaussian Beam (GB) analysis method based on point matching expansion technique is proposed to evaluate the predicted quiet zone performance of the CATR system. Experimental result shows that the amplitude ripple within the quiet zone is less than 1.1dB while the phase...
This paper presents the analysis of the focal region field of the proposed tri-reflector for Compact Antenna Test Range and the matched aperture field for a multimode corrugated horn. The analysis has been carried out by commercial software GRASP and the developed MATLAB program. Numerical results are presented, showing a good match between the two fields. This field can be used to design a matched...
The concept of conjugated field match has been extended to the proposed offset tri-reflector compact range, and a novel tri-slot tri-mode corrugated matched horn has also been developed in this letter. First, the analysis on the field in the focal region of the proposed tri-reflector compact range has been carried out, and a matched aperture field for a multimode corrugated horn is constituted, which...
This paper demonstrates a 9.4/18.8 GHz harmonic radar for bee searching to investigate the phenomenon of colony collapse disorder (CCD). The radar system transmits a pulsed coarse/acquisition code (C/A code) signal with 0° and 90° shift key modulation and then receives the C/A code signal from transponders attached on the bees in BPSK modulation. Using the technique of C/A code positioning, a distance...
Electromagnetic Pulses (EMP) can seriously disrupt the operation of electronic instruments [1]. Traditional methods to measure the EMP mainly focused on the techniques in designing testing probes. This paper presents a new approach to measuring the field strength of EMP focusing on the processing techniques of the measured data. By utilizing the signal processing techniques, the method significantly...
Compact wideband dual-band antenna suitable for thin internal mobile phone application is presented. This antenna has a simple structure and is formed by a printed monopole closely-coupled with a chip-inductor-loaded shorted strip. The antenna occupies a small board space of only about 180 mm2 on the system board and has negligible thickness, making it suitable for thin internal mobile phone. With...
A novel compact single feed circularly polarized disk patch antenna with high front-to-back ratio for radio frequency identification (RFID) reader in the ultra high frequency (UHF) is proposed. A perturbation is induced by two cuts for the circular polarization. Four silts on the disk are used to miniaturize the size of the antenna. Furthermore, the backward radiation is reduced by the slits and the...
In this paper, we propose a novel design of enhancement bandwidth and band- rejection function for small open slot antenna. The measured and simulated results show that the proposed design has a very wide impedance bandwidth of 130% (from 2.3 to 10.9 GHz) and a band-rejected characteristic. The proposed method also has a very simply structure and proves to be a good candidate for low-cost small open...
The novel design of broadband and triple-band T-type monopole antenna for WiMAX applications has been proposed and studied. The proposed antenna has a compact size of 28 times 26.4 mm2. For the wideband performance of the proposed antenna, the dimensions of the notches on the ground plane and the T-type radiation patch have been studied by parameter analysis. Furthermore, embedded a narrow inverted-L...
Three configurations of small open-slot antennas have been implemented and investigated. The bandwidths of three different shapes open-slot antennas are all over 105 % is obtained. The proposed antenna (Antenna 3) is with simple structure and the small size only 30 times 50 mm2 or less. The measured results show the proposed design can be operated in different antenna size with a wide-band characteristic...
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