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Optical generation of ultra-wideband signals with a reconfigurable spectral notch-band

Xiang P., Chen Y., Chen D., Zhao J.

Optica Applicata

2014

Vol. 44, nr 3

411--419

A novel method for optical generation of ultra-wideband signals with a reconfigurable spectral notch-band is proposed. In the proposed system, ultra-wideband signals are generated in the optical domain and an optical tunable delay line is deployed to introduce a notch-band to the spectral profile of the generated ultra-wideband signals, which can effectively avoid the signal interference between ultra-wideband signals and pre-planned narrowband wireless signals used in wireless local area networks (WLAN). A theoretical model describing the proposed system is derived; the optical generation and fiber transmission of ultra-wideband signals with a reconfigurable notch-band are demonstrated via computer simulations.

Design of an Ultrawideband CPW-Fed Monopole Antenna with a Band-Notch Function

Hosseini-Varkiani M., Hojat-Kashani F., Kamyab Hesari M.

International Journal of Electronics and Telecommunications

2011

Vol. 57, No. 1

109-113

In this paper, a CPW-fed monopole antenna for ultra wideband (UWB) applications using band-notch characteristics with size of (24×24×1.6 mm³ ) is presented. The antenna is designed for operation across the entire UWB from 3.1 to 10.6 GHz with band-notch in 5-6 GHz, by inserting an H-shaped slot on the CPW staircase feed line. The proposed antenna has a reflection coefficient below -10 dB through the frequency band. Also, reasonable gain values and good radiation pattern over the same frequency band have been observed. Details of the proposed antenna and experimental results are discussed and parametric study is presented.