In the evolution of optical networks, spectral efficiency (SE) enhancement has been most cost-efficient and thus main driver for capacity increase decades. As a result, development transport systems focused on $C$ - notation="LaTeX">$...

This article proposes a novel multiband antenna with “C + O” structure, which uses two classic circular letters and combines them. The is suitable for wireless applications such as second generation (2G), third (3G), fourth (4G), WLAN, Bluetooth. based on the structural characteristics of monopole antenna. It vertical quarter-wavelength radiator mainly composed letters, symmetrical along feeder...