National Key Laboratory of Antennas and Microwave Technology Xidian University Xi’an 710071 China;
National Key Laboratory of Antennas and Microwave Technology Xidian University Xi’an 710071 ChinaDepartment of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Macau 999078 ChinaState Key Laboratory of Millimeter Waves Nanjing 210096 China;
Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Macau 999078 China;
National Key Laboratory of Antennas and Microwave Technology Xidian University Xi’an 710071 China;
microstrip antenna array; sequential-phase feeding network; straight strips; shorting pins;