Extension of the operating band of printed emitters using distributed excitation Dmitriy Voskresenskiy, Elena Ovchinnikova, Nguen Dinh To, Pham Van Vinh and Ye Htut Khaung ITM Web Conf., 30 (2019) 05011 Published online: 27 November 2019 DOI: 10.1051/itmconf/20193005011