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
Intermediate film for laminated glasses, and laminated glass
Audio and music data transmission medium and transmission protocol
Pharmaceutical treatment process using chitosan or derivative thereof
Content reproduction apparatus and content processing method therefor
Method of stimulating tissue healing
High purity diphenyl sulfone, preparation and use thereof for the preparation of a poly(aryletherketone)
Laser processing method and apparatus
  Randomly Featured Patents
Telephone system with stimulus operation or default operation
Method of establishing connection between network elements in a radio system
Method for compression and expansion of display data
Cleaning apparatus with triangular shaped mount for attachment and quick disconnect
Method for handling an equipment inside a building by a crane installed outside
Electrostatic propulsion engine with neutralizing ion source
Shorts combined with multi-purpose straps with rings
Method of manufacturing semiconductor device having transition metal oxide layer and related device
Electronic timepiece inspection circuit
Image sensing device having a photometric element for setting an exposure condition for the image sensing device