Feed horn

About: Feed horn is a research topic. Over the lifetime, 2395 publications have been published within this topic receiving 26548 citations. The topic is also known as: feedhorn.

Radar system comprising overlapping transmitter and receiver antennae

Abstract: The invention relates to a radar system for recording the environment of a motor vehicle, comprising: transmission means for emitting transmission signals using one or more transmitter antennae; receiving means for receiving transmission signals reflected by objects using one or more receiver antennae and signal processing means for processing the received signals. The system is characterised in that: it is equipped with transmitter and receiver antennae that are planar and are situated on a level surface; said transmitter and receiver antennae have at least approximately the same emission characteristics and the emission characteristics of the transmitter antennae can be different from those of the receiver antennae; received signals are acquired from different combinations of the transmitter and receiver antennae; in the signal processing means, the angular position in a spatial direction R is estimated for objects from said received signals, using the fact that the received signals from an individual object have different phase positions in relation to one another depending on the angular position of said object in the spatial direction R; and at least two of said transmitter and receiver antennae overlap with regard to the spatial direction R without being identical, said overlap being obtained by at least one of the following arrangements or configurations of the transmitter and receiver antennae: a) the antennae are offset in relation to one another with regard to the spatial direction S that runs perpendicular to the spatial direction R, in particular the transmitter antennae are positioned above the receiver antennae for a horizontal spatial direction R; b) the transmitter and/or the receiver antenna(e) has or have an oblique arrangement with regard to the spatial direction R; c) the antennae are interleaved with regard to the spatial direction R; d) the use of emitting or receiving elements is common to at least two transmitter or receiver antennae.

Dual elliptical corrugated feed horn for a receiving antenna

Abstract: This invention is a compact and cost effective signal receiver for use in conjunction with a parabolic reflector to receive electromagnetic signals from two satellites. The signal receiver has a dual elliptical corrugated feed horn to increase C/N ratio and reduce the spill over loss of the energy of signals receiving from two satellites, and to provide a sufficient rejection for preventing interference coming from the other satellite.

Virtual-antenna receiver

Abstract: The invention is directed to the reception of high rate radio signals (for example DVB-T signals) while the receiver is moving at a high speed (for example in or with a car). Two or more antennas (12, 16) are closely spaced and arranged behind each other in the direction of motion (v) for receiving the radio signals. A signal is obtained which represents a virtual antenna (26) that is at least temporarily stationary with respect to the environment, despite the movement of the receiver. The receiving signal of the virtual antenna (26) suffers at least less distortions than a signal received by one of the first and second antennas (12, 16). In accordance with the invention the signal which represents the virtual antenna (26) is obtained under the control of a feedback signal (SYNC) of the receiver.

High Power Metasurface Reflectarray Antennas Using Switched Shorted Circular Elements

Abstract: A metamaterial design that can rapidly reconfigure its reflection phase angle and safely operate under high incident field strengths is presented for use in a high power microwave (HPM) reflectarray system. The design offers switching between reflection phase angles to allow for beam control with a stationary reflector and feed horn. Two variations of the design are presented which offer (a) fixed (but selectable) reflection phases with high-power operation and (b) on-the-fly reconfigurable reflection phases with low-power operation. For design (b), reconfiguration is easily and quickly accomplished though simple relay-style switching operation. The designs are developmental steps towards a fully on-the-fly reconfigurable reflectarray which can operate with several megawatts of peak input power. Fabrication and testing of the prototype antennas and metasurfaces were carried out and presented.

Parasitic spiral arrays

Abstract: The radiation pattern of an array of circularly polarized elements can be scanned by a mechanical rotation of the elements since the element phase is a function of orientation. This principle has been used in the design of two different arrays of Archimedean spirals, one a "parasitic lens array" and the other a "parasitic reflector array." The lens consists of two arrays of spirals mounted on opposite sides of a conducting plane, each spiral on one side being connected by a transmission line to a corresponding spiral on the opposite side. A feed horn is used to illuminate one of the arrays; the energy received by this array passes through the ground plane via the transmission lines and is reradiated by the spirals on the far side. If the elements are rotated to particular orientations, the incident spherical wave can be focussed, and further, the beam can be scanned if the spirals are rotated properly. The spiral reflector is a single array (using no transmission lines) mounted above a ground plane and, like the lens, is illuminated by a feed horn. It has the same focussing and scanning properties as the lens. Neither array is limited to circular polarization. With a combination of right- and left-hand elements, linear polarization can be used. Twenty-element lenses (2 by 10) and one hundred element reflectors (10 by 10) have been built and the results have verified the predicted performance.