In this paper, three different unit cells are designed on the basis split-ring-cross resonators, and each unit cell has an absorption rate greater than 90% at incident angles of 0°, 30°, and 45°, respectively. They are non-periodically placed in three different zones on the curved surface. Therefore, the proposed conformal metamaterial absorber can achieve a high absorption rate. The performance of the proposed absorber is compared with that of a metallic curved surface and a conformal metamaterial absorber with the same unit cells.

No abstract

A capacitor-loaded electrical small zeroth-order resonant (ZOR) antenna is proposed. The proposed antenna is designed on the basis of a mushroom structure for zeroth-order resonance. To obtain a compact size, the proposed antenna has a rectangular slot on the ground plane, and the chip capacitor is mounted on the slot. The resonant frequency is easily controlled from 2.82 GHz to 2.29 GHz by changing the capacitance from 1 pF to 7 pF, respectively. Therefore, the proposed antenna has the advantages of a small antenna size as well as easy frequency adjustment.

No abstract

In this article, a frequency reconfigurable zeroth‐order resonant (ZOR) antenna using RF micro‐electron‐mechanical‐system (MEMS) switch has been implemented. The ZOR characteristics of the proposed antenna are realized using the composite right‐ and left‐handed (CRLH) transmission line, which is realized by way of a rectangular slot on the ground plane of mushroom‐structured antenna to minimize the antenna size. In addition, the RF MEMS switches are introduced on the slotted ground plane to change operation frequency. Depending on the states of the RF MEMS switch on the slotted ground plane, a shunt inductance of the CRLH transmission line is changed, and its resonant frequency becomes tunable. From the experimental results, the resonant frequency of the proposed antenna is changed from 4.95 to 4.66 GHz. Additionally, the proposed antenna's size is reduced by 71.5% compared with the conventional half‐wavelength patch antenna. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1266–1269, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26803