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A mechanically-controlled phase shifter of left-handed waveguide is developed for beam-scanning slot array antennas. A delay line using similar periodic structures of right-handed waveguide is also developed for grating lobe suppression of slot array antennas with travelling-wave excitation. The left-handed waveguide is composed of periodic structures as the pair of an inductive iris for shunt inductance...
Decoupling and matching feeding networks are considerably interested for small wireless terminals to enhance their abilities in the application for MIMO systems. This paper describes various kinds of decoupling and matching feeding networks and derives the formulas for determining the network elements explicitly. Numerical results are presented to ensure the formula for each decoupling and matching...
This paper presents a numerical method developed in order to compute the performances of antenna arrays taken into account coupling between radiating elements and edge effects. This method is based on domain decomposition techniques applied to boundary element solver.
This paper proposes a technique to estimate signal parameters for the localization of near-field sources by using concentric circular ring antenna array. The concentric ring array has the property of frequency invariance over certain band of frequencies that can help in localizing wideband sources from received wideband signal. Maximum likelihood (ML) method is applied for parameter estimation of...
We analyse the sensitivity of a dual-polarized planar connected array with single-ended low noise amplifier (LNA) loading and differential beamforming of the outputs of LNA pairs. Sensitivity is found to depend on the LNA minimum noise figure source admittance and input admittance, with the dependence on the input admittance being relatively weak. Good performance is obtained if these admittances...
This paper provides a radar absorbing method to reduce the radar cross section of the patch array antennas without any loss of antenna performances. The method was based upon the electromagnetic bandgap absorber using a conducting polymer. First, the patch array antenna with a central frequency of 3.0 GHz was designed. Then, the EBG patterns were also designed that had a radar absorbing performance...
This paper describes a numerical approach for the analysis of a reflector antenna system which is fed by a Phased Array Feed. This approach takes mutual interaction effects into account between the antenna array and the low noise amplifiers in the evaluation of the system sensitivity and optimization of the beamformer weights, and can be used when several signal and noise sources are present on the...
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