No abstract

No abstract

No abstract

No abstract

No abstract

No abstract

A compact triple‐band antenna for wireless local area network/worldwide interoperation for microwave access (WLAN/WiMAX) applications is presented. The proposed antenna can generate three operating bands to cover 2.4/5.2/5.8 GHz for WLAN system and 2.5/3.5/5.5 GHz for WiMAX system using double self‐similar coupled ring elements. Measured results show that the proposed antenna has good omnidirectional radiation characteristics and enough gain across the operation bands retaining a compact size (25 × 38 mm2) and a simple structure. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1084–1087, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26732

Composite material is widely used in the conformal load-bearing antenna structure (CLAS), and the manufacturing flaws in the packaging process of the CLAS will lead to the degradation of its wave-transparent property. For this problem, a novel inverse method of the flaw's dimension by antenna-radome system's far field data has been proposed. Two steps are included in the inversion: the first one is the inversion from the far filed data to the transmission coefficient of the CLAS's radome; the second one is the inversion from the transmission coefficient to the flaw's dimension. The inversion also has a good potential for the separable multilayer composite material radome. A 12.5 GHz CLAS with microstrip antenna array is used in the simulation, which indicates the effectiveness of the novel inversion method. Finally, the error analysis of the inversion method is presented by numerical simulation; the results is that the inversed error could be less than 10%, if the measurement error of far field data is less than 0.45 dB in amplitude and ±5 ∘ in phase.