A wireless system operable to employ phased array passband calibration, the system comprising: a phased array feed; an antenna array including N radiating elements, wherein the antenna array is coupled to the phased array feed, and wherein the antenna array and the phased array feed together form at least a portion of a phased array antenna; an equalization filter (122, 124) coupled to the phased array feed; a calibration probe disposed in a fixed position relative to the antenna array to couple with the antenna array to transfer radio frequency, RF, energy; a database of probe-to-far-field, FF, transforms T n having a probe-to-FF transform for each of the N radiating elements over a plurality of incidence angles and a plurality of frequencies, wherein each probe-to-FF transform T n is defined such that E t θ, ∅ = ∑ n = 1 N E probe n T n where E t ( θ, Ø) is a total electric field at an observation point at incidence angle [ θ, φ] of the plurality of incidence angles and at a frequency of the plurality of frequencies, and E probe n is the electric field measured by the calibration probe for an n th radiating element of the N radiating elements at the frequency of the plurality of frequencies; a calibration component operable to: receive calibration probe measurements E probe n for the plurality of frequencies; determine a calculated radiation pattern of the phased array antenna for each of the plurality of frequencies across the plurality of incidence angles based at least on the calibration probe measurements and the probe-to-FF transforms; and determine a calculated phased array passband response H ( f; θ 0, Ø 0) for a first incidence angle ( θ 0, Ø 0) of the plurality of incidence angles, based at least on the calibration probe measurements and the probe-to-FF transform for the first incidence angle, wherein determining the calculated phased array passband response for the first incidence angle comprises determining a frequency response across the calculated radiation patterns at the first incidence angle; and a filter generation component operable to generate a tuning configuration for the equalization filter, based at least on the calculated phased array passband response. a phased array feed; an antenna array including N radiating elements, wherein the antenna array is coupled to the phased array feed, and wherein the antenna array and the phased array feed together form at least a portion of a phased array antenna; an equalization filter (122, 124) coupled to the phased array feed; a calibration probe disposed in a fixed position relative to the antenna array to couple with the antenna array to transfer radio frequency, RF, energy; a database of probe-to-far-field, FF, transforms T n having a probe-to-FF transform for each of the N radiating elements over a plurality of incidence angles and a plurality of frequencies, wherein each probe-to-FF transform T n is defined such that E t θ, ∅ = ∑ n = 1 N E probe n T n where E t ( θ, Ø) is a total electric field at an observation point at incidence angle [ θ, φ] of the plurality of incidence angles and at a frequency of the plurality of frequencies, and E probe n is the electric field measured by the calibration probe for an n th radiating element of the N radiating elements at the frequency of the plurality of frequencies; a calibration component operable to: receive calibration probe measurements E probe n for the plurality of frequencies; determine a calculated radiation pattern of the phased array antenna for each of the plurality of frequencies across the plurality of incidence angles based at least on the calibration probe measurements and the probe-to-FF transforms; and determine a calculated phased array passband response H ( f; θ 0, Ø 0) for a first incidence angle ( θ 0, Ø 0) of the plurality of incidence angles, based at least on the calibration probe measurements and the probe-to-FF transform for the first incidence angle, wherein determining the calculated phased array passband response for the first incidence angle comprises determining a frequency response across the calculated radiation patterns at the first incidence angle; and receive calibration probe measurements E probe n for the plurality of frequencies; determine a calculated radiation pattern of the phased array antenna for each of the plurality of frequencies across the plurality of incidence angles based at least on the calibration probe measurements and the probe-to-FF transforms; and determine a calculated phased array passband response H ( f; θ 0, Ø 0) for a first incidence angle ( θ 0, Ø 0) of the plurality of incidence angles, based at least on the calibration probe measurements and the probe-to-FF transform for the first incidence angle, wherein determining the calculated phased array passband response for the first incidence angle comprises determining a frequency response across the calculated radiation patterns at the first incidence angle; and a filter generation component operable to generate a tuning configuration for the equalization filter, based at least on the calculated phased array passband response.