In this letter, a novel concept of a high-gain Vivaldi antenna operating in the Ka frequency band is proposed. The antenna is fed by the substrate integrated waveguide. The concept overcomes shortcomings of conventional antipodal Vivaldi antenna using dielectric load with printed metal transition and transverse ripples. The added parts are optimized to obtain a wideband high-gain antenna with low cross polarization. The fabricated antenna shows very good performance over the entire Ka band where the measured gain is more than 10.5 dBi.@en

In the paper, we compare selected concepts of planar antennas developed for body-centric wireless communication to be operated in ISM frequency bands. Antennas, which were originally designed for Teflon-based substrates, have been redesigned for textile materials to create their wearable versions. Wearable antennas have been implemented using conductive fabrics, inkjet printing and screen printing. As a substrate, conventional fabrics and 3D textile materials have been used. Newly developed textile versions of antennas are compared with original Teflon-based antennas from the viewpoint of impedance characteristics.@en

A tapered slot antenna element capable of reconfiguring its beam direction is presented. As the basic element, a Vivaldi antenna fed by a substrate integrated waveguide is chosen. The Vivaldi antenna is complemented by a parasitic planar array of small metallic patches placed in front of its aperture and by corrugated edges of the Vivaldi antenna's arms to provide reconfiguration capabilities. The proposed antenna's beam can be steered in five directions by configuring the interconnections of the parasitic patches and by activation/deactivation of the corrugated edges in the antenna arms. The antenna steers the radiation beam over ±30° in E plane and operates in the frequency band of 6.0–6.5 GHz. The measured gain at 6.25 GHz for 0°, ±15°, and ±30° beam direction of the antenna with ideal switches, is 8.4 dBi, 7.5 dBi, and 6.7 dBi, respectively.@en

This study deals with a design procedure and achieved parameters of a microstrip patch antenna array fed by a substrate integrated waveguide (SIW) operating at V-band. The antenna array consists of 6 × 8 microstrip patch antennas which are aperture coupled with an SIW-based feeding network. The antenna design is performed in a full-wave electromagnetic solver (ANSYS HFSS) for the operation frequency 60 GHz. The design procedure of the proposed antenna array comprises the analysis of an isolated radiating element, the synthesis of a linear array, and the development of an SIW-based power divider. At the operation frequency 60 GHz, a fabricated prototype has an impedance bandwidth of 1.8% for a reflection coefficient lower than -10 dB, a gain of 21.6 dBi, and a low sidelobe level below -23 dB in the E-plane and H-plane.@en

Presents a reply to comments on the paper, ”Comments on Wideband Skin-Equivalent Phantom for V- and W-Band,”(Aminzaech, R., et al),IEEE Antennas Wirel. Propag. Letters.@en