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The problem of efficiently and effectively compute the response (i.e., reflection coefficients) of next-generation reflectarray elements with wide number of degrees-of-freedom is addressed in this work. Towards this end, a machine learning-based approach based on advanced Kriging strategies is exploited (instead of classical full-wave solvers) in order to predict the response of complex unit cells...
This work presents the design and implementation of a phased array antenna for reconfigurable 5G backhaul network links. In order to minimize costs, the antenna has been developed using low cost RO4003 substrates and off the shelf electronic components. The antenna operates in Ka band (19 GHz) with scan range down to 50°.
We present a novel non-iterative model based on ray analysis to characterize non-metallic, weak dielectric objects (like threat objects) on the surface of a highly conducting background (like the human body) using a focused continuous millimeter-wave sensor. For a simple constant thickness dielectric slab on a ground plane, there are five primary scattering phenomena that must be considered.
This paper presents the design methodology of multi-beam phased array of antennas that may provide high gain and narrow beam radiation patterns within a desired coverage range. The advantages of high energy efficiency in the coverage area provide the flexibility of applications in various area such as wireless power transmission and mobile communications. The relatively flexible mechanism to determine...
This paper proposes a review of the use of time-based arrays as RF energy providers in those wireless applications where an energy-aware transmission is of key importance. The higher simplicity and versatility of time-modulated arrays (TMAs) with respect to other modern radiating systems is deeply discussed: in particular, the multi-harmonic radiation capability of TMA is efficiently deployed in the...
The use of an array antenna, transmitting pulsed signals and applying time-delays between the elements to create an area of high power density in front of the array at a prescribed position at a chosen moment in time is discussed. Using realistic bandwidths and pulse repetition frequencies leads to the creation of undesirable hot spots. Replacing the array elements with small phased array antennas...
In this work, the impact of different system configurations on the SNR performance of hybrid-passive-active phased arrays is studied. The separation of the functional core components of active arrays into active and passive parts provides the possibility to reduce power consumption, size and cost, which is of interest especially in mobile applications. Power consuming and expensive active components,...
In this work the problem of synthesizing the excitations of a linear array, clustered into contiguous sub-arrays of irregular length, is addressed. By suitably exploiting the behavior of clustered array aperture distributions (i.e., step-wise discrete functions), the problem has been formulated as the minimization of the total variation (TV) of the excitations, satisfying a matching condition on a...
Pattern recovering of conformai phased array on changing surfaces is receiving an increasing attention in the last years. This paper presents the pattern recovery of a strongly deformed conformal phased-array using the projection method. A 4 × 4 flat array is placed on a doubly curved surface. The phase compensation technique is applied first on rows, and then, considering rows as single antenna elements,...
This paper proposes a frequency diverse array (FDA) design approach, based on nonlinear frequency offsets and time-modulated weights, for far-field wireless power transmission (WPT). The objective is to optimize the frequency offsets and weights across the array elements to provide maximum end-to-end energy transfer efficiency (ETE). A set of numerical examples is reported and discussed to validate...
A new design of reflective phase-shifting surface for generating an orbital angular momentum (OAM) vortex wave in the radio frequency domain is presented in this paper. The reflective phase-shifting surface consists of single-layer square patches periodically arranged. Theoretical formulations of phase-shift distributions are deduced and used to design the reflective phase-shifting surface producing...
Time Modulated Uniform Circular Arrays (TMUCA) can produce Orbital Angular Momentum (OAM) modes using relatively inexpensive hardware. For enhanced spectral efficiency in line-of-sight links, it is desirable to produce multiple OAM modes simultaneously. TMUCA typically suffer from leakage of energy into all the other available OAM modes, which is undesirable because it increases crosstalk between...
Controlling the mutual coupling between array elements is one of the key problems in phased array designs. In this letter, a wideband decoupling network is proposed to suppress the mutual coupling between adjacent array elements. It is shown that the employment of the proposed network leads to a significant improvement of the operating bandwidth under the condition of maintaining a wide scan range,...
An infinite periodic array of multimode parallel-plate waveguide sections of finite length, each of which is excited by TM modes from a pair of input waveguides, is considered. The array performance is analyzed by the method of projection mode matching on the boundaries of the regions. A few networks of the array excitation are considered for forming overlapped subarrays shaping sector flat-topped...
In this paper, high impedance periodic structure (HIPS) is applied to improve radiation pattern of the antenna element. The working mechanism of HIPS array is investigated. The structure could improve the surface-wave and the broad-beam radiation performance of the individual antenna element. It is benefit for the wide scan performance of the phased array. A microstrip antenna is fabricated and measured...
A planar tri-band rectangle-rings microstrip antenna design is presented in this paper. The antenna has three equally tuned resonant bands and also maintains consistent radiation patterns in all the operational sub-bands. The antenna has a single port and its cavity-backed waveguide-like configuration results in minimum mutual coupling levels in antenna array configuration. The antenna element is...
A new calibration method of active phased array antennas is presented in this paper. This method can be applied to the antenna arrays of various sizes and various radiating element numbers. It takes into account the edge effects and the coupling between the radiating elements. This method allows avoiding the degradations of the antenna radiation pattern caused by mismatch produced during a scanning...
In this paper, a phased array antenna is designed at millimeter-wave frequency bands for future 5G based smartphone applications. The proposed antenna is a novel open slot-PIFA antenna made on a low cost FR4 board. The antenna array covers a frequency range of 26–32 GHz with a bandwidth of 6 GHz. The antenna exhibits a very good radiation pattern when integrated with the mobile phone chassis. The...
Lockheed Martin Space Systems Company has pioneered advanced antenna solutions over several decades and built a wider range of payload solutions than any other company in the industry. This paper presents a few antenna technologies which has been successfully developed and flown over the years.
This paper introduces the heritage of Mitsubishi's phased array antennas(PAA's) development focusing on mobile satellite communication terminals from commercialization of product standpoint.
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