Novel thin and compact H-plane SIW horn antenna

The substrate integrated waveguide (SIW) technology allows to construct several types of commonly used antennas in a planar way. However, some practical constraints limit their performances when frequencies below 20 GHz are considered. In the case of SIW horn antennas, the available substrates are much thinner than the wavelength yielding to poor matching and undesired back radiation. In this paper, an innovative structure to overcome these limitations is presented. It consists of a transition printed on the same SIW substrate, which improves both the radiation and the matching performances of conventional SIW horns. The horn shape is also further optimized by reducing its dimensions required for a given directivity. This is obtained by modifying the horn profile in order to effectively combine different TE modes. Guidelines are provided to design this type of thin and compact SIW horn antenna. They were applied to manufacture a prototype in the Ku-band with a substrate thinner than lambda(0)/10. Measurement results validate the proposed concepts showing excellent performances

Lens-based Ka-band antenna system using planar feed

This paper presents a simple, low-cost and compact mobile ground terminal antenna for Ka-band satellite communications that operates in the downlink band (19.7-20.2 GHz). The antenna is composed of a shaped dielectric lens which tilts in front of a planar feed to direct the beam. The planar feed is a circularly polarized patch antenna placed inside a cavity. The lens allows a mechanical beam steering from 0° to 57° in relation to zenith with a scan loss of 4.5 dB. In order to show the potential of a planar antenna as a feeder for this application, the proposed system is compared with a previous solution composed of the same dielectric lens and a horn antenna as feeder.info:eu-repo/semantics/publishedVersio

A printed transition for matching improvement of SIW horn antennas

The substrate integrated waveguide (SIW) technology allows to construct several types of commonly used antennas in a planar way. However, frequency limitations associated to commercial substrates appear in the implementation of certain types of antennas, e.g., SIW horn antennas are not well matched when the substrate thickness is much smaller than the wavelength. A printed transition is proposed to overcome this problem. Differently from current solutions, no bulky elements are required allowing to maintain the most important features of this technology namely its compactness and ease of manufacturing. In order to quickly analyze and design the transition, both a coupled resonator and a transmission line models are developed, together with design guidelines. The proposed transition is designed to match a H-plane SIW horn antenna built in a thin substrate (thickness < lambda(0)/10) at different frequency bands at the Ku-band. Experimental results for 3 different transitions show that the matching characteristics are efficiently improved compared with the conventional SIW horn antenna and validates the proposed models

Dual-polarized one-dimensional leaky wave antenna

In this abstract we present a one-dimensional leakywave antenna fed from two ports that provides a dual-polarized radiation pattern. It is the first time that dual-polarized radiation is achieved from a single one-dimensional leaky-wave radiating aperture. This simple and robust antenna provides high gain in both horizontal and vertical linear polarization with low cross-polarization levels (below -40dB) which makes it potentially suitable for applications such as polarimetric radar

A new type of printed Ku-band SIW horn antenna with enhanced performances

International audienc

Near-field focusing employing sinusoidally modulated reactance surfaces

International audienceThis work aims at showing the feasibility of performing 2D near-field focusing using a Leaky-Wave Lens (LWL) based on Sinusoidally Modulated Reactance Surfaces (SMRS). The polarization of the field at the focus is perpendicular to the antenna aperture, due to the geometry of the structure. Electrically small focal distances are achieved, combined with very small spot diameters. The limitations of this approach are discussed, which are mainly related to the prediction of the focal point. The concept is proven by simulations and experimental testing is in progress. © 2016 European Association of Antennas and Propagation

Extended SIW for TEm0 and TE0n Modes and Slotline Excitation of the TE01 Mode

International audienc

A printed transition for matching improvement of SIW horn antennas

International audienc

A new type of thin and compact SIW horn antenna with radiation improvements

International audienc