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
Display screen with graphical user interface
Hybrid interconnect scheme including aluminum metal line in low-k dielectric
Ventilated vacuum communication structure
Video reproducing apparatus and video reproducing method
Communication system, authentication device, control server, communication method, and program
Injection molding method and injection molding machine
  Randomly Featured Patents
Switch device for a power tool
Degradation resistance of semiconductor electroluminescent devices
Spin motor for a hard disk assembly
System and method for minimizing transmitted data between diverse institutions
Single cell for fuel cell and solid oxide fuel cell
Nail lacquer remover comprising propylene carbonate, propylene glycol and dimethyl isosorbide
Circuitry and method for selectively protecting the integrity of data stored within a range of addresses within a non-volatile semiconductor memory
Output power modulated wind responsive apparatus
Aligning device for hitching a towed vehicle
Automated optical measurement apparatus and method