in this article, the linear array (with 20 elements in the horizontal orientation) of microstrip antenna is examined with horizontal polarization. the set includes three microstrip substrates. there is a power network in two lower substrates and microstrip patches in the upper substrate. excitation of patches has been done as coupled through the power network in two lower substrates. using the ...

The construction of a low-cost and reliable array antenna system is required to facilitate the practical use of the adaptive antenna in the mobile communication field. The array antenna system can be verified by DOA (Direction of Arrival) estimation. This dissertation describes the attempt to achieve a high-precision adaptive antenna and the examination of this device, which suppresses the numb...

This paper presents of Smart antenna system based on the direction of arrival (DOA) estimation and adaptive beamforming. Direction of arrival (DOA) estimation is based on the MUSIC for identify the direction of signal and adaptive beamforming is achieved by LMS algorithm. The smart antenna system designed involves a hardware part which provides real data measurement of the incident signal recei...

A practical normal-mode helical antenna array together with a new method for the compensation of mutual coupling effect is proposed for the efficient adaptive nulling of interferences in a mobile communication environment. The helical antenna array is shown to be able to generate deeper nulls than an equivalent monopole antenna array in the presence of mutual coupling effect. The helical antenn...

This paper presents the design and implementation of a new adaptive dual-antenna array for mitigation of both interference and multipath effects in digital mobile communications at the handset level. This proposed system employs a nonlinear adaptive algorithm in the front end of the receiver to enhance the transmission quality in confined areas. The enhancement is blind since no priori knowledg...

A system simulator for performance evaluation of adaptive antennas in UMTS FDD networks has been developed. The simulator is flexible, it uses realistic channel and system assumptions, and for a given scenario provides the maximum network capacity. The antenna types included in the simulator are switched lobe, phased array and adaptive array as well as conventional fixed sector antenna. Analyse...

.............................................................................................. 3 1 Theoretical Background ..................................................................... 5 1.1 What is an Active Phased Array Antenna? ............................................................... 5 1.1.1 Switched Beam Antenna ....................................................................

Principle, control theory, and application of the ESPAR (Electrically Steerable Parasitic Array Radiator) antenna are introduced. A typical ESPAR antenna consists of monopole or dipole elements, one of which is the radiator (fed element) and the others are the parasitic radiators with variable reactance devices loaded on them. It can provide a lower-cost solution as an adaptive array antenna or...

Antenna pattern control techniques for mobile terminals such as adaptive array antenna are expected to improve the characteristic of high-speed radio communications. The drawbacks of adaptive antenna based on DBF (Digital Beam Forming) are the requirement of the same number of RF receivers and A/D (analog-to-digital) converters as the number of array elements, since digital signal processing ha...

In practical array systems, traditional adaptive beamforming algorithms are known to degrade if some of exploited assumptions on the environment, sources, or antenna array become wrong or imprecise. Therefore, the robustness of adaptive beamforming techniques against environmental and array imperfections and uncertainties is one of the key issues. In this paper, we present an overview of recent...