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Range limited antenna

Patent image
NSA

Range limited antenna includes first and second pair of antenna elements, and an RF signal processing network connected to both pair of antenna elements. The network has a function, F(Ξ,x)≈ΦA(x)−ΦB(x), where x is a signal, ΦA(x) is the phase angle of signal x at the first element pair, ΦB(x) is the phase angle of signal x at the second element pair, and Ξ contains all additional parameters which bear on the system. The network is configured to pass a signal for which F(Ξ,x)>ε, where ε is a threshold amount, such that the antenna has gain to signals within a radius and has attenuation outside the radius.

Inventors: 
Althouse, Mark L. G.
Patent Number: 
Technical domain: 
Communications
FIle Date: 
2005-11-02
Grant Date: 
2007-11-06
Grant time: 
734 days
Grant time percentile rank: 
13
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY