Broadband Microwave Absorber based on End-loading Folded-Dipole Array
Keywords:
Electromagnetic shielding, equivalent circuit, folded dipole array, microwave absorberAbstract
Microwave absorbers have been widely used in electromagnetic compatibility, radar absorbing material and cloaking etc., and therefore attract much attention in recent years. In this work, a microwave absorber based on an array of receiving folded-dipoles with a grounded air spacer is proposed. The cell of the absorber can be seen as a three resonators in tandem formed by dipole-mode and stub-modes of the receiving folded dipole and the grounded spacer with thickness of λ/4, i.e., an equivalent three-pole filter. Based on the equivalent circuit, the impedance matching during a wide frequency range can be achieved. Moreover, to verify the proposed technique, a prototype of dualpolarized absorber is fabricated and measured. A little variation between the simulation and measurement results are observed, however, the relative bandwidth can still reach up to 105%. In addition, compared with other absorbers constructed with metal and lumped elements, the proposed absorber has a high ratio of bandwidth/thickness, which is around 8.5 and be with dual-polarizations.
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