Beamwidth-reconfigurable antennas are useful for the intersatellite link of low earth orbit formation flying and constellation, as they prevent unauthorized satellites from eavesdropping. In this article, a circularly polarized slot array antenna based on half-mode substrate-integrated waveguide (HMSIW) K-band beamwidth reconfiguration is proposed using new radio frequency (RF) switch structure...

Figures 1. a) WALTER (circa 1965) was a teleoperated anthropomorphic robot constructed as a high-school science-fair entry; b) WALTER's grippers, elbows, and shoulder joints were tendon-actuated. 7. This actual punched card used on CRAWLER I shows the two rows of holes representing input and output data. The sketch on the back is a preliminary gripper design (for CRAWLER II) that was abandoned ...

The relevance of sheet processing technology, which finds increasing application, is given. Efficient equipment for metal and mounting justified proposed. This article deals with upcut shears’ operation. solution to the mathematic model manual shears using Mathcad provided.

The wireless market is developing very fast today with a steadily increasing number of users all around the world. An increasing number of users and the constant need for higher and higher data rates have led to an increasing number of emerging wireless communication standards. As a result there is a huge demand for flexible and low-cost radio architectures for portable applications. Modern rad...