This paper reports a dual-polarized frequency-selective rasorber that has a transmission window with low insertion loss and two absorption bands at both sides of the passband. Equivalent circuit and simple design guidelines for rasorber design are further developed. First, the notch structure with high Q is used to make the absorber realize the notch characteristic. Then, a frequency selective surface is utilized to replace the ground of the absorber. Note that the center frequency of the passband is consistent with the notch frequency. Therefore, the incident power is allowed to penetrate the proposed rasorber with a low insertion loss and transmissive behavior of the proposed rasorber is realized by this way. In addition, it is found that the main transmission band and lower absorption bands almost maintain stable performances in the angular range of 0 • to 35 • , while the upper absorption bands get slightly worse as angular range increases for both the TE and TM incidences. A rasorber prototype has been fabricated to experimentally validate the principle and design approach. The measurements agree reasonably with the simulated ones. Finally, a broadband and high-selectivity rasorber is achieved simultaneously. INDEX TERMS Absorption, dual-polarized, insertion loss, rasorber, transmission. MEIJUN QU received the B.S. degree from the College of Physics and Electronics, Shanxi University, Taiyuan, China, in 2015. She is currently pursuing the Ph.D. degree with the School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China. Her research interests include microwave passive components, antenna, metamaterials, and electromagnetic compatibility. SIYANG SUN is currently a Deputy Research Fellow with the China Academy of Information and Communication Technology, China Telecommunication Technology Labs. As an Antenna Research and Development Engineer, he has participated in many national scientific research projects. He was responsible for the development and testing of antenna systems, completed the design, commissioning, and testing of various antennas (arrays), and successfully applied them in many projects. As a Project Director Designer, he was responsible for the coordination, communication, document writing, debugging, and testing of the project. He is currently involved in MIMO OTA and 5G terminal testing, standard setting, and related technology research. He has published over 10 academic papers and has applied for a national defense patent. LI DENG was born in Sichuan, China, in 1982. He received the B.Eng. and M.Eng. degrees in communication engineering from Beijing Jiaotong University, in 2004 and 2007, respectively, and the Ph.D. degree in communication engineering from the Beijing University of Posts and Telecommunications (BUPT), Beijing, China, in 2010. In 2012, he joined BUPT. He is currently an Associate Professor with the School of Information and Communication Engineering, BUPT. His research interests include electromagnetic theory, metamat...