Active Admittance and Impedance of Hexagonally Sampled Dipole and Slot Connected Arrays

Analytical formulations of the active admittance and impedance of connected arrays based on dipole and slot antennas, respectively, when elements are arranged in a hexagonal lattice, are presented. Different canonical dielectric layers stratifications are considered. The formulations is based on multi-layer Green’s function spectral...

Connected array of coherent photoconductive pulsed sources to generate mw average power in the submillimeter wavelength band

Characterization of a Dual-Polarized Connected-Dipole Array for Ku-Band Mobile Terminals

In this paper, we present the characterization of a Ku-band connected-dipole array for mobile Satcom application. The prototype array consists of 2 × 256 dipole radiators arranged in a square grid, to form 16 × 16 dual-polarized cells. It has been designed to operate over a wideband ranging from 10.7 to 14.5 GHz (30%), accommodating in a single...

Ku-Band Dual-Polarized Array of Connected Dipoles for Satcom Terminals: Theory and Hardware Validation

We present a Ku-band dual-polarized phased array demonstrator for satellite communications. The prototype array is composed by 512 connected-dipole elements, 16x16 for each polarization, arranged in an egg-crate configuration. A loop-shaped feed structure is used to maintain good polarization purity for beam scanning up to 60 degrees in any...

A 3- to 5-GHz Wideband Array of Connected Dipoles With Low Cross Polarization and Wide-Scan Capability

A wideband, wide-scan phased array of connected dipoles has been designed and fabricated. Measured results from a 7 7 prototype demonstrator are presented for experimental validation. In order to avoid common-mode resonances that typically affect this type of array, loop-shaped transformers are included in the feed network. The common-mode...

Analytical Description and Design of Printed Dipole Arrays for Wideband Wide-Scan Applications

Wideband arrays of printed dipoles with inter-element loads are investigated. A closed-form expression for the active input impedance of the array element is derived with a spectral domain approach. The procedure is based on an extension of the Green's function formulation for arrays of connected dipoles to the case of dipoles coupled via loads....

Truncation effects in connected arrays: Analytical models to describe the edge-induced wave phenomena

This paper presents a Green's function based procedure to assess edge effects in finite wideband connected arrays. Truncation effects are more severe in broadband arrays, since the inter-element mutual coupling facilitates the propagation of edge-born waves that can become dominant over large portions of the arrays. As a consequence, the overall...

Edge-born waves in connected arrays: A finite × infinite analytical representation

Connected arrays constitute one of the most promising options for wideband phased arrays. Like most phased arrays, they are designed using infinite array theory. However, when finiteness is included, edge effects perturb their behavior. These effects are more severe when the arrays are designed to operate over very broad frequency ranges, since...

Finiteness effects in wideband connected arrays: Analytical models to highlight the effects of the loading impedances

Most phased arrays are designed using infinite array theory, which does not account for edge effects. However, this approximation might not be adequate for the design of wideband arrays, for which truncation effects are more significant than in traditional narrow-band arrays. In particular, edge effects can be very severe in broadband connected...

Green's function based equivalent circuits for connected arrays in transmission and in reception

Connected arrays constitute the only family of antenna arrays for which the spectral Green's Functions have been derived analytically. This formalism is extended here to the receiving case. When the arrays are assumed to be infinitely extended and periodically excited, rigorous equivalent networks can be derived to represent the electromagnetic...

A dual-band planar array of connected dipoles: Experimental validation based on bistatic RCS measurements

Rigorous equivalent networks representing connected arrays in transmission and reception are derived in this paper. These equivalent networks are not based on reciprocity but on Green's functions. Thus, all components have well identified and physically meaningful roles. A dual-band connected array demonstrator is then presented to validate the...

A Novel Printed-Circuit-Board Feeding Structure for Common-Mode Rejection in Wide-Scanning Connected Arrays of Dipoles

A novel Printed-Circuit-Board (PCB) solution to avoid common-mode resonances in connected arrays is proposed in this paper. It consists in a loop-shaped circuit that rejects common-mode current propagation over more than an octave bandwidth. The use of such common-mode rejection loop allows the design of linear and dual polarized array of...

Frequency Selective Surfaces for extended Bandwidth backing reflector functions

This paper deals with the use of Frequency Selective Surfaces (FSS) to increase the Efficiency × Bandwidth product in Ultra-Wide Band (UWB) antenna arrays whose efficiency is limited by the front-to-back ratio. If the backing reflector is realized in one metal plane solution its location will be suitable as antenna ground plane only on a limited...

Ultrawide-Band Properties of Long Slot Arrays

In this paper the ultrawide-band properties of a long slot array are described. The study provides the rigorously derived Green’s function (GF) for an infinite long slot array. FromtheseGF active impedances and radiation patterns for various cases were obtained. The ultrawide bandwidths and the array performances of such apertures are...