Patent ID: 9748640
Date: 2017-08-29
CPC Classifications: H01Q

Claim:
1. An all-metal antenna for sending and receiving broadband radio frequency waves, comprising: at least two conductive antenna arms; wherein the antenna arms wind along and around a three-dimensional profile; wherein the profile is generally a domed top portion atop a rotationally symmetric body portion; wherein each antenna arm is a metallic plating following a path of a meandered loxodromic spiral on the domed top portion and a path of a meandered helix spiral on the body portion; and wherein the antenna arms have non metallic space between them and wherein the antenna arms and the space between them have the same shape and size and are rotationally offset versions of each other; a radio frequency absorbing material that fills the bottom of the body portion to a height at least halfway up the body portion and defines an air cavity between the absorbing material and the top of the domed top portion; wherein the body portion has a base and wherein a diameter of the base is as small as 11.2% of the wavelength of a lowest frequency of interest.