A miniaturized dual-band dual-polarization base station antenna array operating at 2.4-2.8 and 4.6-5.0 GHz is proposed in this paper. The upperband unit is embedded in the lower-band unit to miniature the array size. The size of the proposed shared-aperture antenna element is 0.28 × 0.28 λ L . To ensure the normal radiation of dual-band under the small frequency ratio, a meander slot frequency selective surface structure is introduced, which is electromagnetically transparent to the lower-band unit and function as metal ground for the upper-band unit to ensure the normal radiation of the upper and lower-band units, respectively. Simulation and measured results show that the antenna array meets the following design specifications: dual-band operating (voltage standing wave ratio [VSWR] < 2), mutual coupling less than −20 dB basically, satisfactory gain and radiation characteristics.

A multilayer, ultra‐wideband absorber is proposed in this paper, which consists of a hybrid circuit analog absorber and a metal resonant absorber. The circuit analog absorber is located at the upper part of the absorber to absorb low‐frequency electromagnetic waves, and the metal resonant absorber is located at the bottom of the absorber to absorb high‐frequency electromagnetic waves and provide a reflecting plate for the absorber. Through simulation, the absorption rate of the designed absorber can be greater than 90% in the range of 2.33–18.43 GHz, and an equivalent circuit is established for verification. In addition, the absorber has good angular stability and polarization insensitivity. The prototype of the absorber was manufactured and measured, and the test results are basically consistent with the analysis results.

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