A design technique for generating negative group delay (NGD) without the use of lossy circuits is reported. Furthermore, the lossless NGD circuit is employed in designing a serially fed antenna array. The NGD is generated by using an antenna and a T-junction power divider. The NGD circuit cancels out the positive group delay in serially fed arrays resulting in beam squint elimination.Index Terms -Active antenna array, anomalous dispersion, delay-lines, negative group delay, phased array, serially fed antenna array.

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A new design for a serially fed antenna array employing a negative group delay (NGD) circuit is reported in this paper. The NGD is generated within the feed line using an amplifier and a T-junction power divider. Therefore, the positive group delay caused by the interconnecting transmission lines between the adjacent antennas is canceled. This provides a constant phase shift over the entire antenna bandwidth, eliminating beam squint. Phase variation improvement of 83% within a bandwidth of 200 MHz at a center frequency of 10 GHz has been achieved.

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