نتایج جستجو برای: antenna arrays

تعداد نتایج: 94493  

2013
Sima Noghanian

Adaptive antenna arrays are widely used in wireless communication and radar. The understanding of array design and optimization often needs sophisticated signal processing methods to estimate the Degree of Arrival (DoA). DoA estimation algorithms often require numerical analysis. We propose an educational tool that can be utilized for adaptive antenna array simulation and DoA estimation. There ...

2017
A. Gupta U. Madhow A. Arbabian Ali Sadri

Compact antenna arrays with a moderately large number of elements (e.g., 16 elements in a 4× 4 planar configuration) can be realized at low cost at millimeter wave frequencies. This provides the opportunity for cost-effective synthesis of large aperture antenna arrays using sparse placement of such compact “subarrays”. In this paper, we investigate the design of arrays of subarrays constructed ...

2007
Marco A. Panduro Angel G. Andrade David H. Covarrubias Aldo L. Méndez René Domínguez Gerardo Romero

This paper deals with the interference rejection capability of circular antenna arrays, as base stations of wireless communications systems. In general, this figure of merit depends strongly on the array configuration and is a function of the direction of arrival of the desired signal, the number of antenna elements, and their spacing. The main goal and contribution of this paper is to provide ...

2003
Christof Jonietz Utz Martin

Adaptive array antennas are very effective in mitigating the effects of co-channel interference (CCI) and multipath propagation in wireless communication systems. Here, antenna arrays applied to uplink reception in a broadband F/TDMA cellular system are investigated. The system employs QPSK with 15.36 Mbit/s. For low complexity spacetime equalization a mixed solution is proposed based on a MMSE...

2009
M. A. Panduro C. A. Brizuela D. A. Acosta

A comparison between different modern population based optimization methods applied to the design of scannable circular antenna arrays is presented in this paper. This design of scannable circular arrays considers the optimization of the amplitude and phase excitations across the antenna elements to operate with optimal performance in the whole azimuth plane (360◦). Simulation results for scann...

2016
Ayushi Agarwal Sheifali Gupta Amanpreet Kaur

Microstrip antenna arrays are one of the popular antenna configurations for nowadays wireless communication system. The paper proposes a compact novel design of multiple elements electromagnetically coupled stacked antenna array which operates in Cband. The antenna resonates at 6 GHz and shows bandwidth of 521 MHz with 5.84dBi gain. The proposed antenna shows the ECC to be 0.03 which indicated ...

2013
Shaya Karimkashi Ahmed A. Kishk Darko Kajfez Guifu Zhang David L. Boren

Some new focusing properties of time-domain ultra wide band (UWB) focusing array antennas are presented. The large current radiator (LCR) is considered as the UWB antenna element. Each LCR is replaced by a set of infinitesimal dipoles modeling both the near field and the far field patterns of the antenna element, as well as the coupling between the elements. Several antenna arrays with differen...

2013
Ruwaybih Alsulami Heather Song

The design, fabrication, and characterization of the microstrip circular antenna arrays were presented. The proposed antennas were designed for single band at 2.45 GHz and dual bands at 3.3 3.6 and 5.0 6.0 GHz to support WLAN/WiMAX applications. The proposed single and dual band antennas showed omnidirectional radiation pattern with the gain values of 3.5 dBi at 2.45 GHz, 4.0 dBi at 3.45 GHz, a...

2009
Alexander Geißler Rainer Kronberger Frank Dietrich Christian Drewes

This paper shows the influence of small coupled antenna arrays on the MIMO efficiency. Two different antenna models with varying antenna distances are investigated: dipoles and realistic terminal antennas. Two solutions to decouple the antennas are presented: 1) A parasitic element; 2) A hardware design of a matching network on a substrate which is the first implementation of a recent proposal ...

2009
S. W. Yang Y. K. Chen Z. P. Nie

Time modulated linear antenna arrays consisting of printed dipoles above a ground plane are simulated using the finitedifference time-domain (FDTD) method. The FDTD method brings great convenience to the investigation of the time domain responses of the time modulated arrays. In conjunction with the near-to-far field transformation in time domain, the far-field transient response can be compute...

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