Bi-blade century bandwidth antenna

Abstract

A Bi-Blade Antenna is disclosed which will radiate and receive multi-octave electromagnetic waveforms with century bandwidth (i.e. 100 to 1) using two blade antenna elements and a coaxial transmission line feed. The blade antenna elements each have a comparatively narrow throat, a mid-section called a mouth, and a tip. The two throats are fixed in proximity to each other and are fed by the coaxial line feed. The central conductor of the feed is connected to one throat while the outer coaxial conductor is connected to the second throat. The mouth is formed by an arc of constant radius to result in a low voltage standing wave ratio of about 1.19 to 1.

What is claimed is: 
     
       1. An antenna comprising: first and second blade antenna elements fixed in proximity with each other; and   a coaxial transmission line feed which has a central conductor connected with said first blade antenna element, said coaxial transmission line feed having an outer conductor connected with said second blade antenna element.   
     
     
       2. An antenna as defined in claim 1, wherein said first and second blade antenna elements each comprise: a blade element which has a throat, a mouth, and a tip, said throat serving as a feed point and being electrically connected to said coaxial transmission line feed and being comparatively narrow compared to the mouth, the mouth being a mid-section of said blade and being the blade's widest point, and the tip being an area of constant radius, said tip thereby resulting in a low voltage standing wave ratio of about 1.19 to 1.   
     
     
       3. An antenna, as defined in claim 2, wherein said antenna includes an array of first and second blade antenna elements fixed in proximity with each other and fed with a plurality of coaxial transmission line feeds, each of said coaxial transmission line feeds having a central conductor connected with one of said first blade antenna elements, and an outer conductor connected with said second blade antenna element. 
     
     
       4. An antenna, as defined in claim 3, where each of said first and second blade antenna elements has a length of about twenty two inches; a mouth width of about seven inches, and a width of about 0.1 inches.