Printed antenna
First Claim
1. A printed antenna comprising an end fed elongate first dipole element provided on one side of a dielectric substrate, said first dipole element having a portion acting as an antenna dipole and a feed portion, a second dipole element provided on a second side of the dielectric substrate, the second dipole comprising first and second elongate elements disposed one on each side of the longitudinal axis of the first dipole element as viewed through the substrate and a ground plane coextensive with only the feed portion of the first dipole element, said ground plane being connected to the first and second elements.
3 Assignments
0 Petitions
Accused Products
Abstract
A printed antenna comprises an end fed elongate first dipole element (12) provided on one side of a dielectric substate (10). A second dipole element (16, 17) is provided on the opposite side of the dielectric substrate. The second dipole comprises first and second elongate elements (16, 17) disposed one on each side of the longitudinal axis of the first dipole element as viewed through the substrate. A ground plane (14) on the second side of the substrate is connected to the first and second elements (16, 17) at a distance from a free end of the first dipole element corresponding substantially to a quarter wavelength of the frequency (or centre frequency) above interest. The first and second elements (16, 17) are a quarter of a wavelength long and may be inclined relative to the first dipole element (12) or extend parallel thereto (4 (not shown)). Pairs of the printed antennas may be connected with switching elements to form antenna diversity arrangements.
197 Citations
12 Claims
- 1. A printed antenna comprising an end fed elongate first dipole element provided on one side of a dielectric substrate, said first dipole element having a portion acting as an antenna dipole and a feed portion, a second dipole element provided on a second side of the dielectric substrate, the second dipole comprising first and second elongate elements disposed one on each side of the longitudinal axis of the first dipole element as viewed through the substrate and a ground plane coextensive with only the feed portion of the first dipole element, said ground plane being connected to the first and second elements.
- 7. The combination of first and second parallel arranged printed antennas and switching means for shorting out a predetermined one of said first and second antennas, wherein each of said first and second antennas comprises an end fed elongate first dipole element provided on one side of a dielectric substrate, said first dipole element having a portion acting as an antenna dipole and a feed portion, a second dipole element provided on a second side of the dielectric substrate, the second dipole comprising first and second elongate elements disposed one on each side of the longitudinal axis of the first dipole element as viewed through the substrate and a ground plane coextensive with only the feed portion of the first dipole element, said ground plane being connected to the first and second elements.
Specification