Abstract: A dipole antenna includes a plurality of generally parallel metal wiring lines, and a plurality of identical or similar unit circuits arranged in a row along the extending direction of the metal wring lines and connected with one another. Each unit circuit includes a connection portion for connecting the metal wiring lines together via at least one first inductor, and at least one first capacitor inserted into at least one of the metal wiring lines. The plurality of unit circuits are identical unit circuits. Alternatively, the plurality of unit circuits include unit circuits operable in the right-hand system and unit circuits operable in the left-hand system.

Abstract: The arrangement is for cancelling unwanted sidelobes in travelling-wave arrays, especially the back lobe where the main beam approaches the end-fire direction; the array should have high symmetry, i.e., with the usual form of array (radiators spaced along a single feeder), the radiation patterns when fed from either end should be mirror images. Cancellation is obtained by having feed connections (2,2') at both ends of this form of array (1), the feed at one end being attenuated (8) relative to the other and effectively subtracted (6) therefrom. In RF form, for receiving or transmitting, the subtraction can be effected by phase-reversing (7) the signal in one of the feed connections. In baseband form, suitable for receiving only, diodes are included in both feed connections and subtraction performed at baseband frequency.

Abstract: Stripline antenna arrays of the type in which the strip turns through successive right-angle corners to form successive four-cornered cells, the lengths of the longitudinal and tranverse strip sections being such that the summed radiation in each cell has the same polarization direction, viz vertical, horizontal or circular, radiating in the broadside direction effect arbitrary polarization directions radiating in any direction in the plane (x-z) normal to the array which contains the array axis, by using cells having six potential right-angle corner sites and strip sections of appropriate lengths. The number of actual corners may reduce to four; e.g. where strip-section lengths reduce to zero.

Abstract: In a prior form of stripline antenna, the strip turns through successive right-angle corners to form successive multi-cornered cells in which the lengths of the longitudinal and transverse strip sections are such that the summed radiation from each cell radiates in the same direction and with the same polarization direction. In the present disclosure, the distribution of radiated power along the array is varied, e.g. to maximize it at the center, by varying the absolute lengths of these strip sections as between cells while maintaining their required relationships, e.g. by progressively increasing these lengths towards the center of the array in order to increase the radiated power accordingly. This compares with the previously known method, viz varying the strip width.

Abstract: A length of microstrip line turns through successive right-angle corners to form a rectangular pattern comprising successive quartets of such corners. Each right-angle corner radiates with a polarization which is predominantly diagonal, and the strip lengths between the corners of each quartet are made such, in relation to the operating wavelength in the strip, that the radiation from each quartet sums to produce a desired polarization direction, e.g. vertical, horizontal, or circular of either hand. Some forms of the invention can be used in a resonant as well as a travelling-wave mode, the latter giving a main lobe whose direction sweeps with frequency.

Abstract: A travelling wave stripline antenna array adapted for use as a frequency-swept antenna, comprising a pattern of conducting material on an insulating substrate with a conducting backing, the pattern comprising a feeder strip and a plurality or radiating antenna elements each in the form of a strip attached to and extending tranversely away from the feeder strip, and having an open circuit termination at its free end. At least some, and preferably all, of the strips are formed with a longitudinal slot extending from the opposite side of the feeder strip and terminating before the open circuit end of the strip, so that each slotted strip behaves as a phase shifter as well as a resonant radiating antenna element.