A novel frequency selective radome (FSR), which is "transparent" within the operating band of the antenna while absorbing out-of-band incoming waves in a very wide band, is presented in this article. In order to absorb undesired signals out of the band, square loops loaded with lumped resistors are used. The pass-band property is realized by employing meandering square slots with a smaller period to enhance the stability under large incident angles. The equivalent circuit method is introduced to explain the working principles of the FSR and verify the fullwave simulation results based on the FEM codes. The structure's performances under oblique incidences are also investigated.
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