Dual polarization frequency selective medium for diplexing two close bands at an incident angle
First Claim
1. A frequency selective medium for receiving electromagnetic radiation signals incident at an off normal angle, transmitting signals of a predetermined frequency range and reflecting other frequency signals, said frequency selected medium comprising:
- (a) a dielectric substrate having a first surface and a second surface that is substantially parallel with the first surface;
(b) a first array of conductive cross-dipole elements on the first surface;
(c) a second array of conductive cross-dipole elements on the second surface, the first and second arrays each having a conductive surface; and
(d) each said conductive cross-dipole element comprising;
i) a horizontal dipole having a first dimension;
ii) a vertical dipole that is substantially perpendicular to the horizontal dipole and having a second dimension that is different from the dimension of the horizontal dipole.
4 Assignments
0 Petitions
Accused Products
Abstract
A frequency selective medium that is adapted to receive an incident electromagnetic radiation at an angle of incidence of about 45° has two arrays of conductive elements on opposite parallel surfaces (20, 22) of a dielectric substrate. In one embodiment, the conductive elements are cross-dipoles (6) each having a horizontal dipole (10) and a vertical dipole (8) of different lengths and widths. In another embodiment, the conductive elements comprise a plurality of conductive gridded rectangular loops (40). The frequency selective medium allows incident waves that are within a passband of transmit frequencies to transmit through the medium, and reflects waves at frequencies within a stopband adjacent the passband. In other embodiments, meanderline polarizers (28) are added to cross-dipole and gridded rectangular loop frequency selective media to circularly or dual-linearly polarize incident linearly polarized waves.
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Citations
23 Claims
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1. A frequency selective medium for receiving electromagnetic radiation signals incident at an off normal angle, transmitting signals of a predetermined frequency range and reflecting other frequency signals, said frequency selected medium comprising:
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(a) a dielectric substrate having a first surface and a second surface that is substantially parallel with the first surface; (b) a first array of conductive cross-dipole elements on the first surface; (c) a second array of conductive cross-dipole elements on the second surface, the first and second arrays each having a conductive surface; and (d) each said conductive cross-dipole element comprising; i) a horizontal dipole having a first dimension; ii) a vertical dipole that is substantially perpendicular to the horizontal dipole and having a second dimension that is different from the dimension of the horizontal dipole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A frequency selective medium for receiving electromagnetic radiation signals incident at an off normal angle, transmitting signals of a predetermined frequency range and reflecting other frequency signals, said frequency selective medium comprising:
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(a) a dielectric substrate having first and second surfaces for receiving a plurality of dipole elements; (b) a plurality of dipole elements on the first and second surfaces, said dipole elements comprising a plurality of first conductive strips formed in vertical configurations and second conductive strips formed in horizontal configurations, each first and second conductive strip having a first and second length respectively, the first length being different than the second length, said first and second conductive strips configured to provide plurality of rectangular conductive loops each having a length and width that is different from the length, and, (c) a rectangular grid on the first and second surfaces formed of first horizontal elongated conductive strips and first vertical elongated conductive strips, said grid forming a series of rectangular enclosures, wherein each rectangular enclosure contains one of the rectangular conductive loops. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A frequency selective medium for receiving electromagnetic signals incident at an angle in the range of 40°
- to 50° and
transmitting signals of a predetermined frequency range and reflecting frequency signals in another frequency range, said frequency selective medium comprising;(a) a dielectric substrate having a first surface and a second surface that is substantially parallel with the first surface; (b) a plurality of first horizontal conductive strips on each substrate surface, the adjacent first horizontal strips spaced substantially equally from each other at a vertical distance; (c) a plurality of first vertical conductive strips on each substrate surface, the adjacent first vertical strips spaced substantially equally from each other at a horizontal distance that is different from the vertical distance, the first horizontal and first vertical conductive strips forming an array of rectangular grids on each substrate surface; and
,(d) a plurality of rectangular conductive loops formed on the first and second surfaces, each conductive loop formed of second horizontal conductive strips having a first length and second vertical conductive strips having a second length which is different from the first length, wherein each grid enclosing one of the rectangular conductive loops. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
- to 50° and
Specification