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101 results about "Beam tilt" patented technology

Beam tilt is used in radio to aim the main lobe of the vertical plane radiation pattern of an antenna below (or above) the horizontal plane. The simplest way is mechanical beam tilt, where the antenna is physically mounted in such a manner as to lower the angle of the signal on one side. However, this also raises it on the other side, making it useful in only very limited situations.

Phased array antenna

There is provided a phased array antenna having variable phase shifters constituted by using a variable dielectric-constant dielectric substance whose dielectric constant varies according to an applied electric field, which antenna can dispense with a DC blocking element that causes mismatch, and reduce deformation of the beam shape even when beam tilt occurs, in the case where the variable phase shifters are divided into those for right-side tilt and those for left-side tilt and the phase shift amounts thereof are independently controlled.The phased array antenna is provided with a feeding phase shift unit (130) having a laminated structure obtained by laminating at least a ground conductor layer (117), an insulator layer (118), a main conductor layer (119), a variable dielectric-constant dielectric layer (120), and a sub conductor layer (121) in this order, and a propagation characteristic variable line (105) having a line on the sub conductor layer in an area which planarly overlaps a line on the main conductor layer is provided on the feeding phase shift unit. By applying a bias voltage between the main conductor layer and the sub conductor layer, the dielectric constant of the variable dielectric-constant dielectric substance in the propagation characteristic variable line area is varied to control the propagation characteristics. Thereby, a DC blocking element to be inserted in series into the feeding line can be dispensed with.
Owner:PANASONIC CORP

Wideband dual polarized base station antenna offering optimized horizontal beam radiation patterns and variable vertical beam tilt

ActiveUS20050001778A1Improves horizontal plane radiation patternIncreased horizontal pattern front-to-back ratioLogperiodic antennasAntenna supports/mountingsRadiation modeRoll-off
A dual polarized variable beam tilt antenna (10) having a plurality of offset element trays (12) each supporting pairs of dipole elements (14) to orient the dipole element pattern boresight at a downtilt. The maximum squint level of the antenna is a consistent downtilt off of boresight and which is at the midpoint of the antenna tilt range. The antenna provides a high roll-off radiation pattern through the use of Yagi dipole elements configured in this arrangement, having a beam front-to-side ratio exceeding 20 dB, a horizontal beam front-to-back ratio exceeding 40 dB, and is operable over an expanded frequency range.
Owner:COMMSCOPE TECH LLC

Phased array antenna

A phased array antenna includes a variable phase shifting device configured by using a variable dielectric constant dielectric body whose dielectric constant is varied by an electric field applied. When the variable phase shifting device is divided into a group of right side tilt and a group of left side tilt, phase amounts of which are controlled independently of each other, it is possible to eliminate a DC inhibit element causing mismatch and realize one having a beam shape which is little deformed during beam tilt. The phased array antenna includes a power supply phase shifting unit (130) having at least a ground conducting layer (117), an insulating layer (118), a main conducting layer (119), a variable dielectric constant dielectric layer (120), and a sub constructing layer (121) which are layered in this order. The power supply phase shifting unit has a propagation characteristic variable line (105) having a line on a region of the sub conducting layer superposed on the line on the main conducting layer. By applying a bias voltage between the main conducting layer and the sub conducting layer, it is possible to change the dielectric constant of the variable dielectric constant dielectric body of the propagation characteristic variable line portion so as to control the propagation characteristic. This eliminates the need of a DC inhibit element inserted in series to the power supply line.
Owner:PANASONIC CORP

Dual-polarized oblique beam waveguide slot array antenna

The invention relates to a dual-polarized oblique beam waveguide slot array antenna. The dual-polarized oblique beam waveguide slot array antenna comprises more than one unit array antenna; the unit array antenna is formed by a horizontally polarized linear array and a vertically polarized linear array; the horizontally polarized linear array and the vertically polarized linear array are arranged in a horizontal staggered mode; the horizontally polarized linear array is arranged on the upper layer; the vertically polarized linear array is arranged on the lower layer; a horizontally polarized single ridge waveguide is provided with a broadside V-shaped radiation slot; a vertically polarized single ridge waveguide is provided with a broadside U-shaped radiation slot; a feed portion is in a ridge waveguide form and accordingly the integral bandwidth of the antenna is effectively guaranteed, the antenna achieves beam inclination, meanwhile the matching bandwidth of the antenna and the radiation efficiency are guaranteed. The integral antenna can achieve a good circular polarization axial ratio characteristic and meanwhile achieve a 45-degree fixed beam inclination angle due to appropriate phase compensation of a feed network. Compared with the waveguide slot antenna at the same frequency band, the dual-polarized oblique beam waveguide slot array antenna is small in size, low in profile and effectively reduces costs due to a bolt fastening installation mode.
Owner:ANHUI SUN CREATE ELECTRONICS

Method and Apparatus of Tilted Illumination Observation

A tilted illumination observation method and observation device with easy adjustment, high speed, good reproducibility and low cost is provided. A high resolution tilt image of a specimen is obtained by extracting the blurring on the scanning spot occurring during beam tilt from the image (step 6) captured by the tilted beam, and the image (step 4) captured from directly above the standard specimen; and then deconvoluting (step 11, 12) the tilted image of the target specimen (step 10) using the extracted scanning spot from the oblique beam.
Owner:HITACHI HIGH-TECH CORP

Method of observing defects

This invention provides a technique for observing defects, which can automatically decide a direction from inclined observation and take an inclined review image. In a defect observing system for detecting the defects and thereafter observing images of the defects from various directions in detail, positions of inclined images to be taken are automatically displayed on a display screen from a planar image (top-down image) of a SEM using CAD data, and the defects are selected from the images displayed on the display screen based on specification by a user, an inclined angle and direction are determined per selected image to take an inclined image (beam-tilt image), and the inclined image of each defect is acquired.
Owner:HITACHI HIGH-TECH CORP
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