PT Unknown AU Gerecht, E Musante, CF Jian, H Zhuang, Y Yngvesson, KS Dickinson, J Goyette, T Waldman, J Yagoubov, PA Gol'tsman, GN Voronov, BM Gershenzon, EM TI Improved characteristics of NbN HEB mixers integrated with log-periodic antennas SE Proc. 10[super:th] Int. Symp. Space Terahertz Technol. PY 1999 BP 200 EP 207 DE NbN HEB mixers ER