The best AI chatbots of 2026: I tested ChatGPT, Copilot, and others to find the top tools around

I pushed eight free AI chatbots to their limits to find the best AI chatbots of 2026. To explore our top picks, check out ZDNET's chatbot-by-chatbot guide.
IEEE

Elevation and Azimuth Direction Finding by Two-Element Pattern Reconfigurable Antenna Array

Abstract: An elevation and azimuth direction-finding (DF) method is presented by introducing the pattern reconfigurable antenna (PRA) into a two-element array. An equivalent multidimensional array is ...
IEEE

Array Element Phase Pattern Consistency Measurement Without Phase Center Alignment Using Multielement Measurement Data and Element Positions

Abstract: Phase response consistency is an important parameter for antenna arrays. In general, phase center alignment with the geometric center of the rotating platform is necessary for antenna phase ...