Patent US3857112A successfully refreshed from Google Patents.
US3857112A
Expired / Lapsed
US
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Broadband quarter-wave plate assembly
Assignee: GTE Sylvania Inc
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Filing: 1973-11-02
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Granted: 1974-12-24
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Expires: 1993-11-02
Abstract
Abstract A broadband quarter-wave plate having a minimum axial ratio over an octave bandwidth comprises a waveguide transmission line having a tapered dielectric slab and a plurality of longitudinally spaced pairs of rectangular waveguide stubs connected to the line in alignment with the undelayed component (EN) of the spatially orthogonal linearly polarized waves comprising the principal electromagnetic wave propagating in the transmission line. Each stub is oriented with the longer of its cross-sectional dimensions extending transversely of the direction of propagation of the wave in the main line and the stubs comprising each pair are diametrically opposed to each other. The transmission line to which the waveguide stubs are connected preferably is square waveguide although circular waveguide may also be used with advantage. The stubs are perpendicular to the axis of the line or alternatively may be folded to conserve space. The primary phase changing element, preferably a linearly tapered or step-tapered dielectric slab, is mounted in the line adjacent to the stubs for longitudinal compactness of the assembly. The relatively small waveguide stub is the electrical equivalent of a frequency independent lumped inductance having utility in other waveguide circuits such as diplexers and filters employing a series inductance element as part of the waveguide circuit.
Inventors
- 👤 J Epis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:38
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/165; H01P1/17; H01P1/172
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
96 words
A broadband quarter-wave plate assembly comprising a waveguide having a wall and adapted to propagate electromagnetic waves therethrough, a substantially planar phase changing element extending transversely of the interior of said waveguide, and at least one waveguide stub having a rectangular cross-section with one dimension longer than the other and communicating with the interior of said waveguide through said wall with the axis of said stub at said wall normal to the plane of said element, the longer of the cross-sectional dimensions of said stub being smaller than the width of the interior of said waveguide.
Claim 2
Dependent Claim
96 words
A broadband quarter-wave plate assembly comprising a waveguide having a wall and adapted to propagate electromagnetic waves therethrough, a substantially planar phase changing element extending transversely of the interior of said waveguide, and at least one waveguide stub having a rectangular cross-section with one dimension longer than the other and communicating with the interior of said waveguide through said wall with the axis of said stub at said wall normal to the plane of said element, the longer of the cross-sectional dimensions of said stub being smaller than the width of the interior of said waveguide.
Claim 3
Dependent Claim
36 words
The assembly according to claim 1 comprising at least a pair of said stubs connected to said waveguide on opposite sides thereof, said stubs being aligned with each other in a direction transversely of said waveguide.
Claim 4
Dependent Claim
19 words
The assembly according to claim 2 comprising a plurality of said pairs of stubs spaced longitudinally along said waveguide.
Claim 5
Dependent Claim
14 words
The assembly according to claim 2 in which said waveguide has a square cross-section.
Claim 6
Dependent Claim
14 words
The assembly according to claim 2 in which said waveguide has a circular cross-section.
Claim 7
Dependent Claim
29 words
The assembly according to claim 1 in which said stub projects outwardly from said waveguide in a direction transverse to the direction of electromagnetic wave propagation in said waveguide.
Claim 8
Dependent Claim
25 words
The assembly according to claim 1 in which said stub extends generally parallel to the direction of propagation of the electromagnetic waves through said waveguide.
Claim 9
Dependent Claim
147 words
A broadband quarter-wave plate assembly adapted to change electromagnetic waves propagating therethrough between linearly and circularly polarized states, said assembly comprising a square waveguide having a longitudinal axis defining the direction of propagation of electromagnetic waves therethrough, a substantially planar dielectric slab extending transversely of the interior of said waveguide whereby to convert linearly polarized electromagnetic waves (E) into an undelayed component normal to the plane of the slab (EN) and a phase-delayed component parallel to the plane of the slab (EP), at least one pair of waveguide stubs connected to said waveguide on opposte sides of said axis, each of said stubs having a rectangular cross-section defined by a long dimension and a shorter dimension and oriented with said long dimension extending generally parallel to the direction of said EP component, said long cross-sectional dimension of said stub being smaller than the width of said waveguide.
Claim 10
Dependent Claim
147 words
A broadband quarter-wave plate assembly adapted to change electromagnetic waves propagating therethrough between linearly and circularly polarized states, said assembly comprising a square waveguide having a longitudinal axis defining the direction of propagation of electromagnetic waves therethrough, a substantially planar dielectric slab extending transversely of the interior of said waveguide whereby to convert linearly polarized electromagnetic waves (E) into an undelayed component normal to the plane of the slab (EN) and a phase-delayed component parallel to the plane of the slab (EP), at least one pair of waveguide stubs connected to said waveguide on opposte sides of said axis, each of said stubs having a rectangular cross-section defined by a long dimension and a shorter dimension and oriented with said long dimension extending generally parallel to the direction of said EP component, said long cross-sectional dimension of said stub being smaller than the width of said waveguide.
Claim 11
Dependent Claim
24 words
The assembly according to claim 8 in which said long dimension of the stub is not longer than one-half the width of said waveguide.
Claim 12
Dependent Claim
47 words
The assembly according to claim 8 with a plurality of longitudinally spaced pairs of said stubs, the longitudinal spacing between adjacent stub pairs being less than one-quarter of the wavelength of waves propagating in the square waveguide at approximately the center frequency of the assembly operating bandwidth.
Claim 13
Dependent Claim
23 words
The assembly according to claim 8 in which said stubs project outwardly from said waveguide in a direction transverse to said longitudinal axis.
Claim 14
Dependent Claim
22 words
The assembly according to claim 8 in which said stubs are folded so as to extend generally parallel to said longitudinal axis.
Claim 15
Dependent Claim
19 words
The assembly according to claim 12 in which each of said stubs and said waveguide have a common wall.
Claim 16
Dependent Claim
18 words
The assembly according to claim 8 in which said waveguide stubs are longitudinally spaced from said dielectric slab.
Claim 17
Dependent Claim
18 words
The assembly according to claim 8 in which said waveguide stubs are transversely aligned with said dielectric slab.
Claim 18
Dependent Claim
122 words
A broadband quarter-wave plate assembly adapted to change electromagnetic waves propagating therethrough between linearly and circularly polarized states, comprising waveguide means through which said waves propagate, a primary phase changing element disposed transversely of said waveguide in a predetermined plane whereby the linearly polarized wave propagating in the waveguide having an electric field vector E is divided into an undelayed component EN normal to said plane and a phase-delayed component EP parallel to said plane, and means for adding to said waveguide means an equivalent of series lumped inductors which affect only said EN component whereby to compensate the increasing phase delay between the EN and EP components from approximately the center frequency of the operating bandwidth to the upper frequency thereof.
Claim 19
Dependent Claim
122 words
A broadband quarter-wave plate assembly adapted to change electromagnetic waves propagating therethrough between linearly and circularly polarized states, comprising waveguide means through which said waves propagate, a primary phase changing element disposed transversely of said waveguide in a predetermined plane whereby the linearly polarized wave propagating in the waveguide having an electric field vector E is divided into an undelayed component EN normal to said plane and a phase-delayed component EP parallel to said plane, and means for adding to said waveguide means an equivalent of series lumped inductors which affect only said EN component whereby to compensate the increasing phase delay between the EN and EP components from approximately the center frequency of the operating bandwidth to the upper frequency thereof.
Claim 20
Dependent Claim
60 words
The assembly according to claim 16 in which said waveguide means is defined by a waveguide wall and said last named means comprises at least one rectangular waveguide stub having long and short cross-sectional dimensions, said stub being connected to said waveguide wall with the long dimension thereof perpendicular to the direction of propagation of waves in said waveguide means.
Claim 21
Dependent Claim
32 words
The assembly according to claim 17 in which the cross-sectional dimensions of said stub are such that the stub is below propagation cut-off at the highest frequency of operation of the assembly.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |