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ABSTRACT:A dual and wide-band printed dipole antenna is presented for IMT-2000 and 5.2/5.4/5.8-GHz WLAN applications

Reverberation chambers (RCs) are now widely used for the estimation of various antenna parameters such as radiation efficiency, gain, diversity gain, etc. The accuracy of such measurement relies on the assumption of a well-stirred field within the cavity. This paper evaluates the contribution of remaining unstirred path components as a function of the antenna position and the cavity wall shape. It shows their impacts on the estimated properties of an antenna, and discusses the ways to reduce their effects.

Reverberation chambers (RCs) were recently reported as a low-cost alternative to anechoic chambers (ACs) to perform radar cross-section (RCS) pattern measurements. The method consists of using transmitting and receiving antennas pointing towards a target under test placed on a rotating mast. As a classical RCS characterization, the echo signal is analysed based on two measurements with and without the target in the RC. In the hypothesis of an ideal diffuse field generated in the RC, this signal difference appears as the echo signal hidden in a Gaussian noise. In case of a point-like backscattering target, observing this signal over a given frequency bandwidth allows the identification of the target response as a sinusoidal signal over this bandwidth whose period is related to the antenna-target distance measured from the measurement calibration plane positions. Therefore, the extraction of the magnitude of this sinusoidal signal requires a proper estimation of this distance. Furthermore, a sinusoidal regression processing relies on the approximation of a constant envelope over the selected frequency bandwidth, imposing some restrictions. In this paper, we introduce a two-step method that consists in identifying the most appropriate distance according to the target's orientation before estimating the magnitude of the sinusoidal signal. We highlight improvement of RCS estimation on a point-like back-scattering target compared to the one-step procedure applied so far. In addition, it is shown that the analysis performed regarding the estimated distance provides a physical insight into the position of the equivalent backscattering point.