Active antenna

About: Active antenna is a research topic. Over the lifetime, 2246 publications have been published within this topic receiving 26493 citations.

Antenna for active - passive seeker

Abstract: Disclosed is an antenna for an active-passive seeker which can respond to an active Ka-band and a passive broadband signal. The present invention comprises: a passive antenna part realized in the shape of a ring, having multiple spiral antennas arranged to receive signals in different frequency bands preset for the ring, and transmitting the signals, which have been received in different frequency bands, to a reception part; and an active antenna part realized in the shape of a circle, arranged at the center of the passive antenna part, radiating a transmission signal transmitted from a transmission part, and realized as a waveguide slot array antenna for receiving a reflected signal, which has been reflected on a target, as a received signal and transmitting the reflected signal to the reception part.

Effect of 3-dimensional beamforming on full dimension MIMO in LTE-Advanced

Abstract: Large-scale antenna system has attracted significant attention in the wireless industry and academia area in the past few years as a candidate technology for the next evolution towards beyond 4th generation cellular systems. It can utilize a large number of antennas placed in a two-dimensional (2-D) antenna array panel for realizing spatially separated transmission links to a large number of mobile stations (MSs). The arrangement of these antennas on a 2-dimensional active antenna array allows the extension of spatial separation to the vertical domain as well as the traditional horizontal domain with the user-specific 3-dimensional beamforming. Utilizing such spatial separation capability, a base station (BS) can realize spatial multiplexing to a large number of MSs under 3-dimensionally spread channel environment. In this paper, we study the effect of user-specifica beamforming using both veritcal and horizontal direction on the large-scale antenna evolution of LTE system: Full Dimension MIMO. Evaluation results with various antenna configurations show while FD-MIMO provides significant improvement over conventional LTE systems, the size and spacing of active array within 2-D antenna structure need to be carefully selected to maximize FD-MIMO's full potentials in different cell deployments.

Method and apparatus for controlling sidelobes of an active antenna array

Abstract: A method of controlling sidelobe distribution in an active electronically steered array, including electronically reshaping the array aperture so as to reduce sidelobes over a selected region of a coverage volume of the array. In one example, reshaping of the aperture is achieved by electronically turning on and/or off selected radiators in the array to vary the angle of edge discontinuities of the aperture, and thereby move the main sidelobes off the principal plane(s) of operation of the array.

Two-Port Reconfigurable Passive Radiator with Switchable Pattern for Active Antenna Application

Abstract: A two-port reconfigurable passive radiator with pattern switching capability and its application in designing of oscillating feedback loop active integrated antenna (AIA) is reported in this paper. Passive radiator consists of two element array of microstrip patch, fed by electromagnetically coupled T-shaped microstrip line. Proposed structure contains feed port (port 1) and coupled port (port 2). Proposed antenna is capable to switch the beam among sum and difference pattern by turning PIN diodes ON or OFF. As an application, oscillating feedback loop active integrated antenna (AIA) is designed by connecting this two-port passive radiator in the feedback path. Two-port passive radiator is fabricated and tested. Measured results are reported and compared with the simulated results. Proposed AIA design is simple and easy to fabricate can be used as a fixed frequency generator and key element for power combining arrays.

Millimeter wave active antenna unit and inter-PCB (Printed Circuit Board) interconnection structure

Abstract: The invention relates to a millimeter wave active antenna unit and an inter-PCB (Printed Circuit Board) interconnection structure. The inter-PCB interconnection structure comprises a main board and anAIP (Antenna in package) antenna module. The main board is a first multilayer PCB and provided with a signal transmission line and a first pad electrically connected with the signal transmission line. The AIP antenna module is a second multilayer PCB and provided with a second pad, an impedance matching transmission branch, an impedance line and a signal processing circuit. The main board and theAIP antenna module adopts a mode of direct welding interconnection between the multilayer PCBs, thereby saving an expensive millimeter wave interconnection assembly on the one hand, and thus being very low in cost; On the other hand, the mode of direct welding between the boards improves the reliability of the product, the interconnection design between the multilayer PCBs can be realized, and the integration between the multilayer PCBs is greatly improved, thereby being conducive to the miniaturization design of millimeter wave equipment. In addition, the second pad and the signal processingcircuit are provided with the impedance matching transformation branch and the impedance line therebetween, thereby being suitable for a wider frequency range and a wider lamination number range.