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Multi-antenna Array Measurements Using Digitizers
Agilent in Aerospace/Defense – Webcast Series
Title: Multi-antenna Array Measurements Using Digitizers
Date: May 29, 2013
Presenter: Alexander Dickson, Application Engineer, Agilent Technologies
There are numerous applications that employ antenna arrays for beamforming. From commercial and satellite communications to radio astronomy and RADAR, multiple antennas are employed for spatial selectivity and interference avoidance through beamforming techniques. When designing a phased array for beamforming, it is important to be able to measure the relative phase and amplitude between antennas in the array while minimizing errors caused by phase offsets created in the test system. For example, in a dynamic phased array, the adjustable phase shifters in each element “steer” the antenna and therefore need to have known phase relationship by the control system that is used to point the beam in the desired direction. The better the cross-channel phase coherence is of the measurement system used to align the antennas, the more precisely the beam can be positioned.
This webcast will discuss using a multi-channel phase coherent digitizer, along with the necessary signal conditioning and down-conversion ahead of the digitizer, to characterize the relative phase and amplitude relationships between antennas in a phased array. The discussion will cover calibrating a digitizer-based system for matched cross-channel magnitude and phase, using digital down-conversion for optimizing the system sensitivity at the required bandwidth, and algorithms used on the resulting complex signals necessary to achieve measurement results of cross-channel (between antennas) phase and gain. At the conclusion of the webcast, a representative system configuration will be described with measurement results derived from the techniques presented.
This presentation will be of interest to systems and test engineers that develop and evaluate antenna systems for radar or communications uses. Particularly, those working in the area of multiple antenna and phased array beamforming systems should attend. Additionally, it will be useful for engineering managers that need more information on new measurement technologies and their effect on the cost of testing these antenna systems.
Alex is an Application Engineer working for Agilent Technologies in Loveland, CO. Alex joined Agilent Technologies in July 2000 as a college hire and has worked in a variety of application engineering and marketing positions. His background in instrument automation and oscilloscopes led to his most recent opportunity to work within Agilent's growing modular instrument division. In his spare time he enjoys running and biking the recreational trails around Loveland.