Ultra-Wideband Research Papers - Academia.edu (original) (raw)
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Recent papers in Ultra-Wideband
A modified coplanar waveguide fed ultra-wideband antenna with extended transmission band to WLAN frequency is investigated. The proposed antenna consists of a modified semi-circular patch and staircase of ground plane. The prototype is... more
A modified coplanar waveguide fed ultra-wideband antenna with extended transmission band to WLAN frequency is investigated. The proposed antenna consists of a modified semi-circular patch and staircase of ground plane. The prototype is constructed on a low cost FR4 substrate. The overall dimensions of proposed UWB antenna are 34 mm x 40 mm. The result has been shown that the proposed antenna archives low VSWR over transmission bandwidth from 2.10-12.7 GHz to cover both WLAN and UWB bands. The average gain is 3.87 dBi. It depicts nearly omni-directional radiation pattern like dipole antenna. Moreover, the fabricated prototype antenna shows a good agreement between the simulated and measured results. It is illustrated that our proposed technique is a good choice for designing any structure of microstrip antenna which appropriate to use for many wireless communication systems.
Ultra-Wideband radio-over-optical fiber (UROOF) technology demonstrates the potential for providing wireless broad-band service for the next generation optical communication system. The performance of MB-OFDM UWB over fiber transmission... more
Ultra-Wideband radio-over-optical fiber (UROOF) technology demonstrates the potential for providing wireless broad-band service for the next generation optical communication system. The performance of MB-OFDM UWB over fiber transmission system is investigated considering optical modulation and demodulation impact. The recent wireless network providers require high transmission bandwidth with voice, data and multimedia service for fixed and mobile users. A radio-over-fiber system capable of very high efficient data transmission and based on multiple-input multiple-output (MIMO) and orthogonal frequency-division multiplexing (OFDM) is presented here. We will develop an ultra-wideband radio-over-optical fiber (UROOF) concepts and technologies for a number of important in-house applications characterized by a best processing gain of about 17.78dB.Channel capacity 870Mbps for 100 users at 60GHz. We also discuss future trends in the field of UWB UROOF technologies in 60 GHz.
We present a novel design procedure to implement wide bandstop frequency-selective structures using the periodic arrays of vertically stacked parallel strip lines (PSLs). The proposed structures employing the PSLs can simplify their... more
We present a novel design procedure to implement wide bandstop frequency-selective structures using the periodic arrays of vertically stacked parallel strip lines (PSLs). The proposed structures employing the PSLs can simplify their design through equivalent circuit models. Three structures are designed based on the simple equations to demonstrate the proposed procedure. The first structure features an independent design of the air and substrate regions, allowing the use of higher order resonances to extend the bandwidth. The second structure employs a cascaded array, and the third represents a hybrid of both the first and second structures. Design examples have been provided for each proposed structure, achieving −10 dB fractional bandwidths of 78%, 100%, and 137% for the first,
second, and third structures, respectively. The operating principles and the design procedures are explained along with the experimental verification for the first two structures.