Electronics

  2010 SEP 8 - (VerticalNews.com) -- "A bandwidth adjustable ultra-wideband (UWB) bandpass filter is investigated using a simple meander-typed etched ground structure (EGS) unit on the lower ground plane. On the upper layer, the feed line of characteristics 50 Omega is modified by attaching a two-directional open-circuited stub to form a modified symmetrical T-shaped microstrip line, which is proposed to achieve wide upper stopband," scientists writing in the Journal of Electromagnetic Waves and Applications report ...read more

  2010 SEP 8 - (VerticalNews.com) -- "This paper presents a dual-mode ultra-wideband bandpass filter with two transmission zeros and a low insertion-loss on ultra thin (100 mu m) liquid crystal polymer (LCP) substrate. The UWB BPF mainly comprises one wavelength (lambda g) square ring resonator with two orthogonally separated I/O ports that are direct-taped to feed electromagnetic (EM) energy," scientists in Kaohsiung, Taiwan report ...read more

  2010 SEP 8 - (VerticalNews.com) -- "This paper presents a modified V-band six-port circuit built on thin alumina substrate. This circuit is implemented using a rat-race and three 90 degrees hybrid couplers," researchers in Montreal, Canada report.

  "The S parameter measurements of both couplers show wideband performances and high coupled-port phase and amplitude balance in the 57 GHz to 64 GHz frequency band, corresponding to the IEEE 802.15.3c industrial standard. Therefore, the proposed six-port exhibits good phase and amplitude balance, while maintaining a good return loss," wrote D. Hammou and colleagues, University of Quebec ...read more