Previous study has used chirp signals to characterize the RF response of a multi-channel RF receiver [1]. The results showed a significant channel imbalance. After applying a time-reversal filter, the channel imbalance was remedied and both phase and amplitude were realigned among the channels. In the present study, the RF response of a complete multichannel receiver with antenna was characterized. A 1–8 GHz phased array antenna was mounted in an anechoic chamber and a chirp signal was used to measure the frequency response of each channel as a function of azimuth angle. Each channel's response was equalized using a time-reversal filter derived from the measured data and a combined beam pattern was formed. Time-reversal filters that steer the beam were also generated and it was found that sidelobe level worsened with larger steer angles. A simple mutual coupling model was proposed to explain the beam pattern feature.


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    Title :

    Wideband phased array calibration method for digital beamforming


    Contributors:
    Longbrake, M. (author) / Liou, L. L. (author) / Lin, D. M. (author) / Buxa, P. (author) / McCann, J. (author) / Pemberton, T. (author) / Dalrymple, T. (author) / Hary, S. (author)


    Publication date :

    2012-07-01


    Size :

    3055209 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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