Abstract

The straight forward scaling of the planar ultra-wideband modular antenna (PUMA) array to UHF or lower frequencies poses significant manufacturing challenges. A new PUMA unit cell was conceived which allows up to 6:1 bandwidth and 45° scanning to be realized in the UHF band. The unit cell contains a printed dipole layer that is fed through vertical stripline cards. A standard, off-the-shelf bolt is used to mimic the ever important PUMA capacitive via. A prototype PUMA array with aperture sampling of 96% of Nyquist and total array profile of 0.66λ h was designed, fabricated, and tested over the band of 0.5 to 2.7 GHz (5.4:1) exhibiting broadside VSWR < 2, cx-pol levels below −10 dB, and orthogonal port isolation of better than 8 dB.

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