Patent ID: 6693595
Filing Date: 2004-02-17
Classification: H01Q

Abstract:
A cylindrical, double-layer microstrip antenna comprising:a first cylindrical dielectric layer defining first and second sides; a conductive ground plane disposed on the first side of the first dielectric layer; an array of conducting strips disposed on the second side of the first dielectric layer, the array of strips being spaced apart to form a slot between each pair of adjacent strips; a second cylindrical dielectric layer defining first and second sides, the first side of the second dielectric layer being secured to the second side of the first dielectric layer and to the array of strips; an array of radiating patches disposed on the second side of the second dielectric layer, each patch being located over one of the slots, the array of patches being spaced apart to form an aperture between each pair of adjacent patches so that, responsive to electromagnetic energy, a high order standing wave is induced in the antenna; and at least one feeding means comprising a first conducting element electrically connected to the ground plane, and a second conducting element electrically connected to a strip connected for feeding electromagnetic energy to and/or extracting electromagnetic energy from the antenna.