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This paper presents a set of additive manufactured (AM) monolithic waveguide-based feed-chain and antenna components, namely a Ku-band diplexer, a Ka-band dual-polarized directional antenna and W-band straight waveguides. These components provide representative examples of the current capabilities of AM technologies. Examples are provided over a large frequency spectrum and for diverse applications...
This paper presents a new methodology for synthesizing reflector panel based on a fully analytical model. The present methodology is applied to the simple case of a two levels reflector panel consisting of metallic strips unit-cell. The model generates a maximal error of 3.39° on the reflection phase.
This paper presents a circularly-polarized dual-band antenna for Ka-band satellite communications which operates simultaneously in both civil and military downlink (17.7–21.2 GHz) and uplink (27.5–31 GHz) bands. The antenna is composed of a metallic ridged cavity that is perforated with a crossed-slot. This cavity is excited in sequential rotation through four feeding coaxial cables, thus producing...
The equivalent admittance of a 2-D array of printed metallic patches/apertures is obtained here by extending a precedent equivalent circuit approach reported by some of the authors. The goal of the present extension is to cover more complex situations like multi-resonant scatterers, several scatterers per unit cell, and conical incidence. After studying the limits of validity of the equivalent circuit...
This paper presents a five-layer circularly-polarized transmitarray antenna operating at downlink (19.7–20.2 GHz) and uplink (29.5–30 GHz) Ka-bands and illuminated by a metallic circular cavity perforated on its top aperture with a crossed-slot. The proposed dual-band transmitarray design is based on a unit-cell composed of split-ring elements, providing phase-shift in transmission by their physical...
By flaring a dielectric waveguide in the H-plane, an H-plane dielectric horn is formed, which could be directly excited by an SIW feed. However, matching and radiation performances are poor due to the thinness of the substrate. To improve these performances, some periodic parallel strips are printed both on the top and bottom planes of the dielectric horn. These strips guide and leak the electromagnetic...
This 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...
In this abstract we present a one-dimensional leaky-wave antenna that is fed from two ports and that provides a dual-polarized radiation pattern from a single radiating aperture. This simple and robust antenna provides high gain in both horizontal and vertical linear polarization with low cross-polarization levels (below −30dB), which makes it potentially suitable for applications such as polarimetric...
We propose a one-dimensional leaky-wave antenna (LWA) fed by two ports which radiates two orthogonally polarized beams corresponding each one to a port. The structure is based on a simple metallic rectangular waveguide whose top surface is drilled with crossed-slots. The waveguide allows the propagation of both the TE10 and the TE01 modes, each one carrying the energy injected by each of the ports...
This paper presents a new topology to excite microstrip patch antennas and to produce dual circular polarization over a bandwidth of 20% to 30%. A stacked patch antenna is excited with four microstrip lines through a ring shaped aperture, using a sequential feeding scheme for improved polarization quality on a broad range of angels. The overall antenna is designed to operate from 10.7GHz to 12.7GHz...
This contribution proposes leaky-wave antennas operating in dual-mode regime in order to achieve dual-beam radiation patterns. Different radiation mechanisms are applied in the guiding structure to induce radiation from two propagative modes. The presented full-wave results show the potential of dual leaky-mode operation when implemented both in Fabry-Perot and substrate integrated technologies.
This paper presents analytical expressions to model the diffraction of plane-waves at planar 2-D distributions of printed dipoles. In contrast to other available analytical or quasi-analytical models, this approach rigorously captures the main underlying physics and dynamic effects of the structure, leading to a very wideband analytical equivalent circuit. The accuracy of this model is verified by...
This contribution provides a fully analytical transmission-line circuit model for the transmission/reflection of an obliquely incident plane wave by a periodic array of printed dipoles. The topology of the equivalent circuit is rigorously derived in the analysis. In contrast with previously reported circuit models, the proposed approach accounts for dynamical effects that enable the application of...
This paper gives an overview of our most recent research results on reconfigurable leaky-wave antennas (LWAs), which have been developed at Universidad Politécnica de Cartagena (Spain) and CSIRO ICT Centre (Australia). Fabry-Pérot and Substrate Integrated Waveguide (SIW) technologies are studied to propose new reconfigurable leaky-wave topologies for beamforming applications.
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