US4833482A — Circularly polarized microstrip antenna array

Claim 1

Independent Claim 91 words

A circularly polarized antenna arrangement, comprising: a pair of linearly polarized antennas for radiating and receiving circularly polarized electromagnetic radiation, each antenna having a plurality of essentially parallel finger-like stripline conductors arranged in an interdigitated pattern, each of said stripline conductors having a plurality of radiating elements protruding outwardly therefrom along one side, said protruding radiating elements along said stripline conducors of one of said antennas being arranged orthogonally to and on the same respective side as said protruding radiating elements along said stripline conductors of the other of said antennas.

Claim 2

Dependent Claim 91 words

A circularly polarized antenna arrangement, comprising: a pair of linearly polarized antennas for radiating and receiving circularly polarized electromagnetic radiation, each antenna having a plurality of essentially parallel finger-like stripline conductors arranged in an interdigitated pattern, each of said stripline conductors having a plurality of radiating elements protruding outwardly therefrom along one side, said protruding radiating elements along said stripline conducors of one of said antennas being arranged orthogonally to and on the same respective side as said protruding radiating elements along said stripline conductors of the other of said antennas.

Claim 3

Dependent Claim 24 words

An antenna arrangement as defined in claim 1 wherein said protruding radiating elements form about a 45 degree angle with their respective stripline conductor.

Claim 4

Dependent Claim 35 words

An antenna arrangement as defined in claim 1 further including a quadrature coupler having first, second, third and fourth branchline terminals, said linearly polarized antennas being electrically coupled between said second and third branchline terminals.

Claim 5

Dependent Claim 25 words

An antenna arrangement as defined in claim 3 further comprising a dielectric substrate, wherein said antennas and quadrature coupler are mounted on said dielectric substrate.

Claim 6

Dependent Claim 31 words

An antenna arrangement as defined in claim 3 further comprising means for generating a signal, said first branchline terminal of said quadrature coupler being electrically coupled to said signal generating means.

Claim 7

Dependent Claim 35 words

An antenna arrangement as defined in claim 1 wherein said protruding radiating elements are about one-half wavelength long and are spaced about one wavelength apart based on the desired operating frequency of the antenna arrangement.

Claim 8

Dependent Claim 28 words

An antenna arrangement as defined in claim 6 wherein said stripline conductors are spaced apart about one-half wavelength based on the desired operating frequency of the antenna arrangement.

Claim 9

Dependent Claim 153 words

An antenna array arrangement for transmitting and receiving circular polarized electromagnetic radiation of an anticipated operating frequency, comprising: a dielectric substrate; a first linearly polarized antenna including at least one first stripline conductor having a second plurality of conductive radiating tabs protruding outwardly therefrom along one side thereof, said first antenna being disposed on said substrate; a second linearly polarized antenna including at least one second stripline conductor having a second plurality of conductive radiating tabs protruding outwardly therefrom along one side thereof; and said second antenna being disposed on said substrate such that said stripline conductors of said first and second antennas are substantially parallel to each other and said first producing radiating tabs of said first antenna are arranged essentially orthogonal to said second protruding radiating tabs of said second antenna, said first and second protruding tabs being disposed on the same respective sides of said first and second stripline conductors.

Claim 10

Dependent Claim 153 words

An antenna array arrangement for transmitting and receiving circular polarized electromagnetic radiation of an anticipated operating frequency, comprising: a dielectric substrate; a first linearly polarized antenna including at least one first stripline conductor having a second plurality of conductive radiating tabs protruding outwardly therefrom along one side thereof, said first antenna being disposed on said substrate; a second linearly polarized antenna including at least one second stripline conductor having a second plurality of conductive radiating tabs protruding outwardly therefrom along one side thereof; and said second antenna being disposed on said substrate such that said stripline conductors of said first and second antennas are substantially parallel to each other and said first producing radiating tabs of said first antenna are arranged essentially orthogonal to said second protruding radiating tabs of said second antenna, said first and second protruding tabs being disposed on the same respective sides of said first and second stripline conductors.

Claim 11

Dependent Claim 40 words

An antenna array as defined in claim 8 further including a quadrature coupler having first, second, third, and fourth branchline terminals, said first and second antennas being electrically coupled between said second and third branchline terminals of said quadrature coupler.

Claim 12

Dependent Claim 24 words

An antenna arrangement as defined in claim 9 further including means for providing a signal to the first branchline terminal of said quadrature coupler.

Claim 13

Dependent Claim 38 words

An antenna arrangement as defined in claim 8 where said radiating tabs are about one-half wavelength long and are spaced about one wavelength apart along said conductors based on the anticipated operating frequency of the antenna array arrangement.

Claim 14

Dependent Claim 199 words

A circularly polarized antenna arrangement having two linearly polarized antennas for radiating two independent linearly polarized electromagnetic waves about 90 degrees out of phase, comprising: a dielectric substrate; a first antenna array having a first plurality of essentially parallel stripline conductors coupled together at one end, each of said first stripline conductors having a plurality of first radiating elements protruding outwardly therefrom along one side of said first stripline conductors in a first preselected direction; a second antenna array having a second plurality of essentially parallel stripline conductors coupled together at one end, each of said second stripline conductors having a plurality of second radiating elements protruding outwardly therefrom along one side of said second stripline conductors in a second preselected direction which is about 90 degrees from said first preselected direction; said first and second antenna arrays being interdigitatedly mounted on said dielectric substrate such that said first and second protruding radiating elements are disposed along the same respective sides of said first and second stripline conductors; and a 3 dB quadrature coupler having first, second, third and fourth branchline terminals, said first and second antenna arrays being electrically coupled to said second and third branchline terminals respectively.

Claim 15

Dependent Claim 199 words

A circularly polarized antenna arrangement having two linearly polarized antennas for radiating two independent linearly polarized electromagnetic waves about 90 degrees out of phase, comprising: a dielectric substrate; a first antenna array having a first plurality of essentially parallel stripline conductors coupled together at one end, each of said first stripline conductors having a plurality of first radiating elements protruding outwardly therefrom along one side of said first stripline conductors in a first preselected direction; a second antenna array having a second plurality of essentially parallel stripline conductors coupled together at one end, each of said second stripline conductors having a plurality of second radiating elements protruding outwardly therefrom along one side of said second stripline conductors in a second preselected direction which is about 90 degrees from said first preselected direction; said first and second antenna arrays being interdigitatedly mounted on said dielectric substrate such that said first and second protruding radiating elements are disposed along the same respective sides of said first and second stripline conductors; and a 3 dB quadrature coupler having first, second, third and fourth branchline terminals, said first and second antenna arrays being electrically coupled to said second and third branchline terminals respectively.

Claim 16

Dependent Claim 29 words

An antenna arrangement as defined in claim 12 wherein said first and second radiating elements form about a 45 degree angle with their respective first and second stripline conductors.

Claim 17

Dependent Claim 22 words

An antenna array as defined in claim 12 wherein said first and second plurality of radiating elements are substantially rectangular in shape.

Claim 18

Dependent Claim 41 words

An antenna arrangement as defined in claim 12 wherein said first and second plurality of radiating elements are spaced about one wavelength apart based on the desired operating frequency of the antenna arrangement along said first and second stripline conductors, respectively.

Claim 19

Dependent Claim 40 words

An antenna arrangement as defined in claim 15 wherein said first stripline conductors are spaced apart about one wavelength and said second stripline conductors are spaced apart about one wavelength, based on the desired operating frequency of the antenna arrangement.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1992-05-22	1992-11-21	1993-05-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1996-05-22	1996-11-21	1997-05-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2000-05-22	2000-11-21	2001-05-23	$7700.00	Window Closed / Lapsed

Circularly polarized microstrip antenna array

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