Patent ID: 6222494
Filing Date: 2001-04-24
Classification: H01P,H01Q

Abstract:
A collinear antenna array formed on an insulating sheet comprising:a first end fed dipole antenna system for a radio frequency generator having an operating wavelength L, comprising:on a first side of an insulating sheet a first and a second quarter wavelength conductive strip in end-to-end connection;on a second side of the insulating sheet a third quarter wavelength conductive strip, overlying the first quarter wavelength conductive strip, a fourth quarter wavelength conductive strip having a longer arm spaced from and parallel to the third quarter wavelength conductive strip and a shorter arm connected to the third quarter wavelength conductive strip, and a fifth quarter wavelength conductive strip having a longer arm spaced from and parallel to the third quarter wavelength conductive strip, symmetrical with the fourth quarter wavelength conductive strip, and a shorter arm connected to the third quarter wavelength conductive strip; andmeans to connect said radio frequency generator between the end of the third quarter wavelength conductive strip remote from the connection to the fourth quarter wavelength conductive strip, and the corresponding end of the first quarter wavelength conductive strip, whereby the second and fourth quarter wavelength conductive strips form a linear dipole antenna; wherein the collinear antenna array further comprises:a feeder stage including a delay line having its input connected to the end of the second quarter wavelength conductive strip remote from the first quarter wavelength conductive strip; anda monopole comprising a conductive strip having one end connected to the output of the delay line.