A compact band notched ultra‐wideband (UWB) antenna with the Hilbert‐curve slot (HCS) is proposed. By introducing the HCS on the UWB antenna, a compact size and the frequency notch function can be simultaneously obtained. On imprinting the HCS on the UWB antenna, the notched 5 GHz wireless local area network (WLAN) band was realized. As for the HCS implementation, we make use of the third iteration order Hilbert‐curve. Numerical simulations and measurements for the proposed antenna demonstrate that the presented methodology is accurate and efficient to design the compact band notched UWB antenna. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2642–2648, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26348

A low profile multiband resonant, dual-element array antenna is proposed for use in handheld communication devices. The proposed antenna comprises two dual shorting pin planar inverted-F antennas and a folded ground plane which operates as a perfect electric conductor case. The feeding scheme adopted for the proposed design produces a fixed phase difference between two antenna elements of the design to achieve an ultrawide bandwidth and a flexible radiation pattern. The proposed antenna design is simulated with commercially available software, which is based on the finite element method. The resonant frequency bands covered are GSM850/900, DCS1800, PCS1900, UMTS2100, and LTE2300/2600 MHz. Details of the design considerations for the proposed antenna are described and the simulated and measured results are presented and discussed, which are in agreement.

A broadband multilayer radar absorbing coating (RAC) operating within the frequency range of 7–12 GHz was designed and fabricated for the purpose of a radar cross section (RCS) reduction of complex naval targets. The proposed RAC consists of three layers: a shop primer, a main absorbing material, and an epoxy resin paint. To validate the effect of a RCS reduction, the proposed RAC was applied to the life‐size mock‐ups of a periscope and snorkel of a representative submarine type. The RCSs of the two mock‐ups with and without the RAC applied were measured, and the results compared with the simulations. The experimental results demonstrate that the proposed RAC guarantees an RCS reduction of 10–15 dB from 7 to 12 GHz. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1907–1910, 2014

A quad‐band planar monopole antenna that consists of a bent ground plane, pair of parasitic patches, and a radiating patch excited by a coaxial feeding is proposed. The proposed antenna design has ability to maintain its resonant frequencies in standalone mode, extended planar ground plane mode, and even when attached to a metal case. This antenna can be used for multiple applications that operate at WLAN 2.4/5.2/5.8 GHz, WiMAX 3.5/5.5 GHz and 4.5 GHz, which is used for point‐to‐point microwave and telemetry applications. The simulated and measured results of the antenna are in agreement with industry standards. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:588–593, 2017

A broadband multi-layer radar absorbing coating (RAC) and transparent shielding film (TSF) operating within the frequency range of 7 to 12 GHz are designed and fabricated for the purpose of a radar cross section (RCS) reduction of complex naval targets such as submarines and ships. The proposed RAC consists of three layers, a shop primer, a main absorbing material, and epoxy resin paint. In addition, a TSF was fabricated by coating an ITO/Ag/ITO multilayer on a polyethylene terephthalate (PET) substrate using roll-to-roll DC plasma deposition technique. The experimental results demonstrate that the proposed RAC guarantees an RCS reduction of 10 to 15 dB from 7 to 12 GHz.