In this article, we present a new design of a coplanar waveguide fed (CPW-fed) ultra-wideband (UWB) antenna with dual band-notched characteristics. Two notched frequency bands are achieved by using two inverted U-shaped stepped impedance resonators. The proposed antenna can operate from 2.82 to 11 GHz (118%), defined by VSWR< 2, except two notched bands around 3.5 GHz (WiMAX) and 5.5 GHz (WLAN)...

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Jari Holopainen Name of the doctoral dissertation Compact UHF-band antennas for mobile terminals: focus on modelling, implementation, and user interaction Publisher School of Electrical Engineering Unit Department of Radio Science and Engineering Series Aalto University publication series DOCTORAL DISSERTATIONS 28/2011 Field o...

This paper addresses the recommendation of online services provided by public administrations taking into account both the specific characteristics of these services and the perception of other citizens. The solution discussed is based on an enhanced hybrid model that relies on content-based and collaborative strategies aimed to exploit the information shared by other users to validate the qual...

in this paper, a novel directional super wide band micro strip antenna based on a simple and new geometry has been proposed. the antenna exhibits the widest bandwidth ever reported to the authors’ knowledge from 50 ghz to 200 ghz. its radiation pattern is approximately steady in the frequency ranges of 50 ghz to 200 ghz. the antenna consists of a club-like radiating patch, a combination of thre...

Orthogonal frequency division multiplexing (OFDM) is becoming the chosen modulation technique for wireless communications. OFDM can provide large data rates with sufficient robustness to radio channel impairments. Many research centers in the world have specialized teams working in the optimization of OFDM for countless applications. Here, at the Georgia Institute of Technology, one of such tea...

Wireless local area networks (WLANs) based on WiFi technology have become a standard part of life for many, whether integrated within a home television or a radio-controlled drone helicopter. Th e latest commercially available version of WiFi, based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11ac standard, provides signifi cant connectivity improvements. In addition, it...

A novel transport system, with directly modulating community antenna television (CATV) signal downstream and phase-remodulating radio-over-fiber (ROF) signal upstream, is proposed and experimentally demonstrated. By modulating multi-carriers CATV signal in amplitude domain and ROF signal in phase domain, a single optical wavelength is able to serve these two applications simultaneous. To be the...

The Federal Communications Commission (FCC) in the United States has made the 700 MHz band available for broadband wireless access. With television channels converting to digital transmission, similar spectrum is expected to be available in other countries since digital TV channels require less spectrum than analog channels. This paper compares the performance and cost of WiMAXTM deployments in...