Abstract: Provided is a single-polarized antenna. This single-polarized antenna includes a power divider and a Vivaldi oscillator array. The Vivaldi oscillator array includes multiple Vivaldi oscillator units uniformly distributed in a circumferential direction of the Vivaldi oscillator array. The power divider includes multiple output ports in one-to-one correspondence with the multiple Vivaldi oscillator units. The multiple output ports of the power divider are coupled to the multiple Vivaldi oscillator units in a one-to-one correspondence.

Abstract: Provided is a dual-polarized antenna. The dual-polarized antenna includes a horizontal radiating unit and a vertical radiating unit. The horizontal radiating unit includes a power divider and a Vivaldi oscillator array. The Vivaldi oscillator array includes multiple Vivaldi oscillator units uniformly distributed in a circumferential direction of the Vivaldi oscillator array. The power divider includes multiple output ports in one-to-one correspondence with the multiple Vivaldi oscillator units. The multiple output ports of the power divider are coupled to the multiple Vivaldi oscillator units in a one-to-one correspondence. The vertical radiating unit is disposed on one side of the horizontal radiating unit and includes a vertically-polarized oscillator.

Abstract: A ceiling antenna includes a first antenna element, a second antenna element, a base plate, a spiral tail and a feeder. The second antenna element is fixedly connected to the first antenna element. The second antenna element is fixed to the base plate. The spiral tail is disposed around the edge of the second antenna element and provided with a notch. The feeder is connected to the first antenna element and the second antenna element, and feeds the first antenna element and the second antenna element.

Abstract: The present invention relates to an anchor point for e.g. lifting and/or lashing down an object. The anchor point comprises a base, which is configured for fixing to the object such that it is rotatable about an axis of rotation. The anchor point also comprises a retainer bracket held on two bearing points on the base such that it is tiltable about a tilt axis relative to the base. In order to prevent the retainer bracket from getting stuck when a force is applied thereto, which may lead to a sudden and jerky turnover of the retainer bracket or even to fracturing of the anchor point and crashing of the load, the tilt axis is movable relative to the base according to the present invention. Preferably, a motion link, for example, is provided on at least one bearing point.