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Due to the influence of environment and multipath effect, the calibration data of spherical near-field antenna measurement are not accurate, which will result in amplitude and phase errors in the near-field to far-field transformation. In order to obtain more accurate antenna radiation pattern, the influence of amplitude and phase errors on the near-field to far-field transformation results are simulated...
For complex targets, a full bistatic near-field scattering data is required for measuring the far field radar cross section (RCS) in principle, but the acquisition time and the computational effort may be prohibitive. In this paper, we consider the far-field monostatic RCS is presented by exploiting only the near-field data relative to an angular region centered on the direction of interest, this...
The accurate multi-polarization 3–10 GHz frequency-domain data of some small trees are obtained by indoor wideband polarimetric scattering measurement system. The relationship between differential extinction coefficient and returned power is quantitatively derived, and the fluctuating of differential extinction coefficient changed with frequency is analyzed by combining the morphological characteristics...
The radar cross section (RCS) of weak scattering source on the surface of an aircraft is usually less than −40dBsm. How to accurately measure the RCS characteristics of weak scattering source is a technical challenge for the aircraft’s RCS measurement. This paper proposes separating and extracting the two-dimensional (2D) reflectivity distribution of the weak scattering source with the microwave imaging...
A fully novel three-dimensional (3-D) microwave image reconstruction algorithm is presented, which based on echo data of stepped-frequency sweeping radar system. The algorithm is not restricted by far field as the traditional imaging algorithm. By synthetic aperture processing for radar data, the high resolution of the image can be achieved. The algorithm belong to a new three dimensional back-projected...
In order to meet the approximate plane-wave irradiation condition, adequate large field or compact range system is needed for antenna pattern measurement, especially for large size antenna, but an outside testing field site or a compact range system is very expensive. Near-field planar scanning system is another method, however it is time-consuming and only suited for directional antenna. In this...
Traditionally, continue-wave method is used in Radar Cross Section (RCS) measurement. But high-resolution information is not gained in the system. The frequency-domain data of an anechoic chamber is obtained by stepped-frequency testing. Using inverse Fast Fourier Transform (IFFT), high-resolution time-domain response is achieved. In order to meet the veracious result, unwanted signals should be eliminated...
Electromagnetic band gap (EBG) structures are widely used for improving the electromagnetic performance. Its surface wave forbidden frequency band and in-phase reflection frequency band are referred as work frequency band, whose properties are closely associated with the parameters of the EBG structure, such as substrate permittivity, substrate thickness, patch size, gap size, etc. This paper presents...
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