US3740751A — Wideband dual-slot waveguide array

Claim 1

Independent Claim 166 words

A linear antenna array having a plurality of radiating elements fed from successive points along a transmission line, and comprising the combination of: a first set of said radiating elements in which the individual elements thereof are spaced by a first spacing factor, said first spacing factor being chosen in accordance with parameters including predetermined beam position and angular beam scan sensitivity as a function of frequency; and a second set of said radiating elements in which the individual elements thereof are spaced along said transmission line first spacing factor, said second set being offset along said transmission line by a second spacing factor with respect to said first set, said second spacing factor being such that the field at the antenna aperture resulting from both of said sets of radiating elements do not produce a grating lobe at a beam andle at which such a lobe would be generated as a result of radiation by said first set in the absence of said second set.

Claim 2

Dependent Claim 166 words

A linear antenna array having a plurality of radiating elements fed from successive points along a transmission line, and comprising the combination of: a first set of said radiating elements in which the individual elements thereof are spaced by a first spacing factor, said first spacing factor being chosen in accordance with parameters including predetermined beam position and angular beam scan sensitivity as a function of frequency; and a second set of said radiating elements in which the individual elements thereof are spaced along said transmission line first spacing factor, said second set being offset along said transmission line by a second spacing factor with respect to said first set, said second spacing factor being such that the field at the antenna aperture resulting from both of said sets of radiating elements do not produce a grating lobe at a beam andle at which such a lobe would be generated as a result of radiation by said first set in the absence of said second set.

Claim 3

Dependent Claim 119 words

A linear antenna array for frequency or phase scanning, comprising: a transmission line; first means comprising a plurality of radiators fed from successive points mutually spaced a first distance along said transmission line for establishing a predetermined relationship of beam angle versus excitation frequency; second means within each of said radiators comprising a subsgroup having a plurality of radiating elements mutually spaced by a second distance from each other and having one element of each of said subgroups located at each of said successive points; said second distance being such as to tend to produce a null at the angle at which a grating lobe would be produced by said first means in the absence of said second means.

Claim 4

Dependent Claim 119 words

A linear antenna array for frequency or phase scanning, comprising: a transmission line; first means comprising a plurality of radiators fed from successive points mutually spaced a first distance along said transmission line for establishing a predetermined relationship of beam angle versus excitation frequency; second means within each of said radiators comprising a subsgroup having a plurality of radiating elements mutually spaced by a second distance from each other and having one element of each of said subgroups located at each of said successive points; said second distance being such as to tend to produce a null at the angle at which a grating lobe would be produced by said first means in the absence of said second means.

Claim 5

Dependent Claim 13 words

Apparatus according to claim 2 in which said transmission line is a waveguide.

Claim 6

Dependent Claim 104 words

Apparatus according to claim 3 in which said waveguide has wide and narrow conductive walls and said radiating elements of said subgroups each comprise a slot in one of said narrow walls, said slots being at a predetermined angle along said narrow wall so as to effect a predetermined coupling and energy phase. Apparatus according to claim 4 in which said slot angle of said radiating elements of aLternate subgroups is of one sense with respect to a plane perpendicular to said waveguide wide and narrow walls and of the opposite sense with respect to said plane for the subgroups between said alternate subgroups.

Claim 7

Dependent Claim 19 words

Apparatus according to claim 4 in which each of said subgroups comprises two slots thereby providing two radiating elements.

Claim 8

Dependent Claim 59 words

Apparatus according to claim 6 in which said first distance spacing said slot subgroups measured between any radiating element in one subgroup to the corresponding element in the adjacent groups is defined as being not less than one half wavelength and not more than one wavelength for any frequency of excitation within the band of utility of said array.

Claim 9

Dependent Claim 22 words

Apparatus according to claim 7 in which said second distance is defined as substantially equal to one third of said first distance.

Claim 10

Dependent Claim 18 words

Apparatus according to claim 8 in which said first and second distances are defined as equivalent electrical lengths.

Claim 11

Dependent Claim 37 words

Apparatus according to claim 2 in which said plurality of radiating elements, in each of said subgroups, is equal to two and said second distance is defined as substantially equal to one third of said first distance.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-06-18	1976-12-18	1977-06-19	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-06-18	1980-12-18	1981-06-19	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-06-18	1984-12-18	1985-06-19	$7700.00	Window Closed / Lapsed

Wideband dual-slot waveguide array

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