Now showing items 21-23 of 23
Multi-channel constant current source and illumination source
(United States Patent and Trademark Office, 2013-12-03)
A multi-channel circuit having respective channels powered through transformers having primary windings connected in series allows substantially equal constant currents to be provided through all channels by cross-regulation ...
Method and structure for achieving spectrum-tunable and uniform attenuation
(United States Patent and Trademark Office, 2013-10-08)
The present invention relates hearing protection devices for the human ear. More particularly, embodiments of the invention provide hearing protection devices capable of tunable acoustic attenuation. The invention relates ...
Perturbed square ring slot antenna with reconfigurable polarization
(United States Patent and Trademark Office, 2013-02-12)
A reconfigurable polarization antenna includes a microwave dielectric substrate having a ground plane that has a centrally located slot with five conducting patches, four of which form an evenly spaced apart perimeter group ...