Slotted surface scattering antennas
First Claim
Patent Images
1. An antenna, comprising:
- a waveguide;
a plurality of subwavelength radiative elements coupled to the waveguide; and
a plurality of lumped element circuits directly coupled to the subwavelength radiative elements and configured to adjust radiation characteristics of the subwavelength radiative elements;
wherein the waveguide includes a bounding surface, and the plurality of subwavelength radiative elements includes a plurality of unit cells each containing a slot in the bounding surface;
wherein the waveguide defines a propagation direction, and the subwavelength radiative elements have inter-element spacings along the propagation direction that are substantially less than a free-space wavelength corresponding to an operating frequency band of the antenna; and
wherein the inter-element spacings are less than or equal to one-third of the free-space wavelength.
2 Assignments
0 Petitions
Accused Products
Abstract
Surface scattering antennas with lumped elements provide adjustable radiation fields by adjustably coupling scattering elements along a waveguide. In some approaches, the scattering elements include slots in an upper surface of the waveguide, and the lumped elements are configured to span the slots provide adjustable loading. In some approaches, the scattering elements are adjusted by adjusting bias voltages for the lumped elements. In some approaches, the lumped elements include diodes or transistors.
-
Citations
45 Claims
-
1. An antenna, comprising:
-
a waveguide; a plurality of subwavelength radiative elements coupled to the waveguide; and a plurality of lumped element circuits directly coupled to the subwavelength radiative elements and configured to adjust radiation characteristics of the subwavelength radiative elements; wherein the waveguide includes a bounding surface, and the plurality of subwavelength radiative elements includes a plurality of unit cells each containing a slot in the bounding surface; wherein the waveguide defines a propagation direction, and the subwavelength radiative elements have inter-element spacings along the propagation direction that are substantially less than a free-space wavelength corresponding to an operating frequency band of the antenna; and wherein the inter-element spacings are less than or equal to one-third of the free-space wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
-
Specification