Miniaturized Microstrip Dual-Band Filters Using Dual-Mode Resonators With Flexible Frequency Ratio and Multiple Transmission Zeros
by Xueyu Huang, Wenjie Feng , Guangxu Shen , Yongrong Shi , Xun Jiang, Yunfei Cao , Zheng Dong, Quan Xue , and Wenquan Che