Resources Contact Us Home
Direct fed spiral antenna

Image Number 2 for United States Patent #3949407.

A direct fed spiral antenna element array is disclosed for radiating electromagnetic energy. Each antenna element is a multi-arm spiral element having inner and outer ends. Phase shifting is obtained with internal phase control wherein switching means serve to interconnect selected ones of the inner arm ends. Each such antenna element is directly fed by a feed network which feeds currents directly to the outer ends of the spiral arms.

  Recently Added Patents
Bioelectric battery for implantable device applications
Treatment of celiac disease with IgA
Platform for generating electricity from flowing fluid using generally prolate turbine
Image sensing apparatus and method of controlling the image sensing apparatus
Touch screen tablet
Film-forming resins as a carrier for topical application of pharmacologically active agents
Copolymer for positive type lithography, polymerization initiator used in production of said copolymer, and composition for semiconductor lithography
  Randomly Featured Patents
Remote-testing arrangement for PCM transmission system
Process for producing turbine bucket with water droplet erosion protection
Biphenyl compounds useful as muscarinic receptor antagonists
Ceiling fan blade iron
Swivel connector
Apparatus for recovering metal from dross
Single longitudinal mode laser diode
6-phenyl-pyridin-2-ylamine derivatives
DMOS transistor protected against polarity reversal