Title:A Novel Differential Microstrip Patch Antenna and Array at 79 GHzAuthor(s):Ziqiang Tong, Andreas Stelzer, Christoph Wagner, Reinhard Feger, Erich KolmhoferAbstract:A novel differential microstrip patch antenna (DMPA) is designed for autonomous cruise control radar systems at 79 GHz. Distinct from conventional single-ended patch antennas, the DMPA uses a pair of coupled lines as feeding line. It eliminates the need of a balun in the RF frontend and supports the realization of more compact radar frontend. First, a single DMPA is designed. The impedance bandwidth reaches 4.7 GHz and the gain at 79 GHz is 6.2 dBi. Simulations show that the length of the patch determines the resonance frequency and the gap between the feed points affects the patch impedance. Furthermore, a four-element series-fed array is presented with 4.6 GHz bandwidth and 12.8 dBi gain. Both the single DMPA and the four-element DMPA array were fabricated and measured. Measurement results show good agreement with simulation results.Booktitle:Proc. International Symposium of Antennas and PropagationPage Reference:1 page(s)Publishing:10/2008