Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Fabrication of high gradient insulators by stack compression
Compositions and methods for activating innate and allergic immunity
Stable nanoemulsions for ultrasound-mediated drug delivery and imaging
Mask blank, transfer mask, and film denseness evaluation method
Integrated emergency medical database system
Method and apparatus for managing communication services for user endpoint devices
Navigating applications using side-mounted touchpad
  Randomly Featured Patents
Linear guide
Waler bracket with attached wedge for concrete forms
Waterproofing of polyester fiberfill
Bicycle hub
Plurality of individually controlled inlet guide vanes in a turbofan engine and corresponding controlling method
Clamp device for removably attaching a vacuum cleaner component to a structure
Multi-beam optical range sensor and self-propelled cleaner and air-conditioner equipped with the same
Providing the most cost-effective long-distance telephone service based on milage band rates
Image processing system
Arylsulfonic acid compound and use thereof as electron-acceptor material