With advances in wireless communication technologies, users can have rich contents not only via wired networks but also via wireless networks such as Cellular, WiFi, and WiMAX. On the other hand, however, lack of spectrum resources becomes an important problem for future wireless networks. To overcome this problem, dynamic spectrum access technology receives much attention. In this paper, we pr...

Different slot structures have been widely used in numerous designs to produce antennas with enhanced bandwidths. In this paper, a printed slot antenna has been introduced as a candidate for use in the multi-band wireless communication applications. The antenna slot structure has a rectangular shape with its width, from the side of feed, has been modified in the form of Koch fractal curve of th...

This paper shows the design of a fractal patch antenna, which uses a unique fractal geometry known as Pythagoras tree with co-planer waveguide (CPW) feeding. The antenna has been designed for dual band operation at the WLAN/WiMAX (2.4 GHz) and WiMAX (3.5 GHz) for ultra-wide bandwidth applications. The antenna was simulated using CST Microwave Studio. The fabricated antenna’s measurement results...

A novel compact design of planar T-shaped monopole antenna with multi-band operation for WLAN/WiMAX system is proposed. By insetting a pair of mirrored L-shaped monopole strips, multi resonant modes close to 2.45/3.5/5.5 GHz band are excited to meet the specifications of WLAN/WiMAX system. And, the obtained impedance bandwidth across the operating bands can reach about 160/1100/2690MHz for the ...

In this paper, a new reconfigurable frequency microstrip antenna with an ability of two rejecting intruder frequency WLAN and WiMAX bands for UWB applications is presented. In this antenna, a defect ground structure (DGS) and a U-shaped slot which is located on the ground plane have been used to improve bandwidth. Antenna impedance matching has been achieved through creating two symmetric incis...

A frequency agile triple band microstrip antenna using defected ground structure for WLAN/WiMAX application is presented, in which frequency agility is electronically achieved by changing the bias voltage of varactor diode. A defected ground structure rectangular patch with dual inverted L-shaped fed with a cross shaped strip line is used to achieve multiple bands. Simulated results are validat...

1. INTRODUCTION Wireless networks are economical and portable. It market ratio is 1:3. Wireless networks are famous among consumers due to secure, reliable, robust and portable connections. WiMax network is one of the famous networks among users; it is provides excellent multimedia services. WiMax is a (Worldwide Interoperability for Microwave Access) which is IEEE 802.16 standard supports lice...

Este trabajo describe el diseño de un arreglo antenas microstrip con parches en forma elipse dual band para aplicaciones Wi-Fi y WiMAX. El consta 4 elementos se fabrica sobre sustrato dieléctrico cuya permitividad dieléctrica es ϵ = 4.4 grosor 1.6mm. Inicialmente los resultados la simulación parámetros básicos antena como: perdida retorno, impedancia entrada, ancho banda patrones radiación; Pos...

In this paper, a novel multi-frequency microstrip antenna with complementary ring slot resonator (CRSR) structure that satisfies Bluetooth, worldwide interoperability for microwave access (WiMAX), and wireless local area network (WLAN) applications is proposed. The conventional consists of circular patch at resonance frequency band 2.5 GHz. By loading two CRSR the radiating element, three opera...