Topic
Null fill
About: Null fill is a research topic. Over the lifetime, 25 publications have been published within this topic receiving 193 citations.
Papers
Patent•
22 Jan 1991TL;DR: In this article, an azimuth beamformer combines the elevation patterns of a plurality of column arrays, each connected to its own interferometer, to produce a pencil beam with a sidelobe structure exhibiting a particular elevation angle.
Abstract: An antenna subject to standoff sidelobe barrage jamming exhibits a null in its sidelobe structure at a selectable elevation angle for all azimuth angles of interest. The null can be set to the elevation angles corresponding to the angle of the standoff jammers. The null is generated with the aid of an interferometer associated with each column of the antenna array. The interferometer produces a pattern having a plurality of lobes. The interferometer pattern is phased and amplitude adjusted relative to the antenna pattern of its associated column line array so that subtraction of the patterns causes one or more sidelobe of the antenna pattern to be at least partially canceled. An azimuth beamformer combines the elevation patterns of a plurality of column arrays, each connected to its own interferometer, to produce a pencil beam with a sidelobe structure exhibiting a null at the particular elevation angle.
41 citations
TL;DR: In this paper, a new design for graphene patch antenna in THz band frequency range is proposed, which supports surface plasmon polariton (SPP) behavior and also provides various conductivity derived from some tunable parameters.
24 citations
Patent•
26 May 1997TL;DR: In this paper, the authors proposed a method of optimising coverage by changing the antenna pattern (14) according to a timing advance, which can reduce the transmission power and interference.
Abstract: The invention relates to a method of optimising coverage by changing the antenna pattern (14). In a solution of the invention, the base station (10) orients the antenna lobe (14) in the vertical direction toward a terminal equipment (11-13) by changing the shape of the antenna lobe according to a timing advance. The nearer the terminal equipment (11-13) is to the base station (10), the more downward the antenna lobe (14) is oriented by turning the antenna lobe (14) primarily downward or by changing the shape of the antenna pattern (14). In this way, transmission power, and thereby interference, is reduced.
20 citations
Patent•
29 Apr 2008TL;DR: In this paper, a phase control element is configured to apply a linear phase gradient to the radiating elements, which provides one-dimensional electronic beam steering for the antenna device, where the antenna devices may additionally include one or two mechanical positioners to mechanically move the at least one 1D phased array in directions orthogonal to the array direction.
Abstract: A phased array antenna device is described The phased array antenna device includes at least one one-dimensional phased array of radiating elements arranged along an array direction, a lens, and a phase control element The lens is arranged such that divergent beams from the radiating elements are collimated by the lens in a direction orthogonal to the array direction to produce a beam The phase control element is configured to apply a linear phase gradient to the radiating elements thereby providing one-dimensional electronic beam steering for the antenna device The antenna device may additionally include one or two mechanical positioners to mechanically move the at least one one-dimensional phased array in directions orthogonal to the array direction, where the phased array enables scanning along the array direction
16 citations
Patent•
15 Nov 1976TL;DR: In this article, a null steering array with a relatively narrow main lobe and a plurality of secondary antennas forming a sub-array for providing a null in the direction of an undesired signal is described.
Abstract: In a null steering array antenna having a main antenna characterized by a radiation pattern with a relatively narrow main lobe and a plurality of secondary antennas forming a sub-array for providing a null in the direction of an undesired signal, a null steering device is associated with each secondary antenna and coupled to receive a portion of the signal from the main antenna for producing a null at each secondary antenna in the direction of the main lobe. The plurality of null steering devices are gated or otherwise activated so as not to operate on signals which are to be nulled by the main null steering apparatus.
16 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2019 | 1 |
| 2017 | 1 |
| 2016 | 1 |
| 2014 | 1 |
| 2013 | 1 |
| 2011 | 2 |