Planar broadband traveling-wave beam-scan array antennas
First Claim
1. A broadband phased array antenna comprising:
- a conducting ground surface;
an array of broadband traveling-wave antenna elements positioned generally parallel to said ground surface and spaced less than 0.5 wavelength apart from said ground surface at the highest operating frequency and more than 0.01 wavelength at the lowest operating frequency, each traveling-wave antenna element comprising at least one pair of sub-elements and being connected with a cluster of medial feed lines, one for each sub-element, wherein said array antenna radiates in a direction above said array antenna and its ground surface, adjacent antenna elements being electrically coupled and impedance-matched with each other to facilitate propagation and radiation of traveling-wave in said array antenna.
1 Assignment
0 Petitions
Accused Products
Abstract
A planar broadband beam-steering phased array antenna with approximately 10:1 bandwidth is comprised of planar broadband traveling wave antenna elements positioned parallel to a conducting ground plane and spaced less than 0.5 wavelength at the highest operating frequency and more than 0.01 wavelengths at the lowest operating frequency. Each planar traveling wave antenna element is a planar frequency-independent antenna or planar self-complementary antenna, and is truncated to fit a unit cell of the phased array. Adjacent antenna elements are arranged to be tightly coupled together or connected with each other and spaced less than 0.5 wavelength apart between their centers throughout its operating frequency range. One or more layers of dielectric or magneto-dielectric substrates/superstrates can be added to enhance specific performances.
30 Citations
12 Claims
-
1. A broadband phased array antenna comprising:
-
a conducting ground surface; an array of broadband traveling-wave antenna elements positioned generally parallel to said ground surface and spaced less than 0.5 wavelength apart from said ground surface at the highest operating frequency and more than 0.01 wavelength at the lowest operating frequency, each traveling-wave antenna element comprising at least one pair of sub-elements and being connected with a cluster of medial feed lines, one for each sub-element, wherein said array antenna radiates in a direction above said array antenna and its ground surface, adjacent antenna elements being electrically coupled and impedance-matched with each other to facilitate propagation and radiation of traveling-wave in said array antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A broadband phased array antenna comprising:
-
a conducting ground surface; an array of broadband traveling-wave antenna elements positioned parallel to said ground surface and spaced less than 0.5 wavelength apart from said ground surface at the highest operating frequency and more than 0.01 wavelength at the lowest operating frequency, each traveling-wave antenna element comprising a medial feed, wherein said array antenna radiates in a direction above said phased array antenna and said ground surface, adjacent antenna elements being electromagnetically coupled or connected; and one or more layers of dielectric or magneto-dielectric substrates and superstrates of various permittivity and permeability to further improve impedance matching and radiation properties for the planar traveling-wave structure in the array antenna. - View Dependent Claims (9, 10, 11, 12)
-
Specification