Active antenna

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

Over-the-Air Testing for Total Radiated Power of Unwanted Emissions

Abstract: 5th Generation Mobile Networks (5G) will employ mm-wave base stations with integrated Active Antenna Systems (AASs) with beam-tracking capabilities using narrow beams obtained from array antennas integrated with radios and Power Amplifiers (PAs). The integration of antennas and electronics means that measurements at antenna connectors are not possible. Regulatory limits for unwanted Radio Frequency (RF) emissions are currently set in terms of Total Radiated Power (TRP). With no antenna connectors, Over-the-Air (OTA) methods for TRP of unwanted emissions are needed. Major challenges are: large number of angular points for electrically large devices at mm-wave frequencies, and large number of possible antenna configurations per frequency. Herein, an OTA TRP measurement method based on power density measurements on a spherical surface in an anechoic chamber is investigated.

An active antenna array with a single common clock and a method for relaying a plurality of radio signals

Abstract: An active antenna system for a mobile communications network and a method for relaying radio signal in the mobile communications network is disclosed. The active antenna system comprises a plurality of antenna elements for relaying radio signals at a first frequency band. The plurality of antenna elements is connected to a plurality of signal paths. A plurality of signal inputs for inputting radio signals at a second frequency band is connected to the plurality of signal paths. A plurality of first mixers in the plurality of the signal paths converts the frequency of the radio signals between the first frequency band and the second frequency band. A plurality of first local oscillators is connected to the plurality of first mixers and a single reference oscillator can be connected through a plurality of first dispersion elements to different ones of the plurality of local oscillators through a plurality of first oscillator signal paths and to a digital signal processor.

Active window antenna for motor vehicles

Abstract: To minimize overmodulation in an active window antenna and radio receiver system, an amplification control voltage is produced in the active antenna, i.e., directly behind the antenna pre-amplifier, and is used to control the amplification of the pre-amplifier.

System and method for enhanced transmission in mobile communication networks using an active antenna arrangement

Abstract: A transmission system and method for use in a mobile communication network comprising an active antenna arrangement of multiple antennas. The active antenna arrangement comprising several pairs of radiofrequency sub-modules each radiofrequency sub-module including a first phase shifter module , a TRX module and a radiating antenna element and where an dynamic phase offset is applied to one of the sub-modules of each pair, and where the phase offset vector is selected according to the signal quality received by users of the mobile communication network using an algorithm which minimizes the duration of the selection process.

Automatic gain vehicle active antenna amplifier

Abstract: The invention relates to an automobile antenna amplifier, in particular to an automatic gain vehicle active antenna amplifier. The amplifier comprises a chip for realizing the automatic gain control logical operation of a signal, a frequency selection circuit for processing a frequency modulation signal and an amplitude modulation signal respectively, an AGC circuit, an AGC threshold value adjusting circuit and an AGC response time adjusting circuit; and the automatic gain vehicle active antenna amplifier utilizes automatic gain control to eliminate voltage error between the output signal amplitude of the antenna amplifier and the needed output signal amplitude, improves the dynamic range of the amplifier to make the output signal stable and reception clear, overcomes the disadvantages of the unstable signal of the prior art and is free from distorting even if the amplifier is in extreme environment with rapidly-changed signal strength.