In this paper, a spiral antenna has been designed for 2 - 18 GHz by investigating different substrates. FR4, Arlon TC600 and Rogers RT/ Duroid 5880 substrates have been compared to study the effects ...

Abstract: The balanced conical logarithmic-spiral antenna is considered as a slow-wave locally periodic structure with a slowly varying period. A study of the near fields and their relationship to the ...

What we know for sure The X-37 program sits in a rare sweet spot: officially real, visually documented, and yet operatio ...

Card Game Can you identify these 20 games just from seeing one of their cards? Our latest quiz puts your deck knowledge to the test Games How well do you know your hacking minigames? Put your wits to ...