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A novel wideband high efficiency filtantenna array for space-borne synthetic aperture radar (SAR) applications is presented. The antenna array operating bandwidth is broadened by subarray technology, in which the subarrays are excited by a ridged waveguide divider. In order to eliminate the data transmission interference on SAR, the evanescent mode waveguide filters are integrated in the divider expediently...
This paper presents the latest progress in demonstrating and characterizing the Traveling-Wave Antenna Array (TWAA) as a Multioctave Planar Phased Arrays (MPPA) capable of efficient wide-angle scan over multioctave bandwidth. (Beam Steering Network (BSN) and T/R module are not included here.) Four brass board TWAA panels having 16∗16 array elements were fabricated and tested for wide-angle scan up...
This study reports a novel tight-coupled dipole array antenna to operate with up to six octave bandwidth and 60 degrees scanning. The array was designed through full-wave EM simulations by employing the current sheet array radiator concept that was advanced by a novel integrated feed network. Several prototypes of planar and conformal arrays across 0.3–20 GHz have been fabricated and tested with good...
The latest study of the millimeter wave (mmWave) phased array in user device (UE) for 5G communication is presented in this paper. Particularly, the body effect on the phased array in a UE/mobile terminal at 15 GHz is investigated with the 3D measured data. Its impact on the recently introduced parameter for phased array in mobile terminal, the total scanning pattern, body loss and the coverage efficiency,...
In this study, technques of cross-polarization suppression for the coplanar waveguide (CPW)-fed monopole antenna with an asymmetric ground plane have been presented. By appropriately etching a notch and embedding a four-slot array in the ground plane, the horizontal current component of the ground plane can be efficiently decreased, thus suppressing the cross-polarized radiation at the broadside direction...
The paper presents results of an investigation of a MU-MIMO system suitable for providing broadband services. The base station has a circular array and each user has a single high gain antenna. Two optimum zero forcing beamformers are considered and semi-orthogonal user selection is used to schedule users in the downlink. A key point of the investigation is to determine the maximum number of users...
This paper describes the design and analysis of a compact and efficient ultra-wideband unidirectional printed Array antenna for indoor applications. A 12cm∗12cm∗1cm array antenna is capable of covering an ultra-wide frequency band starting from LTE up to WI-MAX with an average gain exceeding 5dBi over the entire bandwidth. In comparison with the already existing antenna systems in the wireless market...
Two types of RTSAs are presented, which spectrally decompose a broadband electromagentic signal in space in real-time. The first system is based on an array of LWA fed using an array of phasers, where the dispersion of the phasers in conjunction with the natural frequency scanning of the leaky-wave antenna enable the 2-D frequency scan. The second system is a purely spatial system based on dispersive...
In the paper on the basis of the finite-element method the possibility to create a broadband polarizer in an aperture of an antenna array for operation in a sector of scan angles of ±45° and more is shown. The calculations of angle responses and radiation patterns of the developed model of a broadband four-grid 45° rotator of polarization are given in a sector of scan angles of a ±60° in two planes...
In this paper we have clearly outlined the scientific importance of our work, also in the Square Kilometre Array project context. Section II goes through the main scientific targets and Section III targets the instrumental and technological requirement of the telescope. In subsequent papers, we are going to present a detailed design analysis of the instrument. Stringent measurements will be performed...
The increasing demand for safety and security in the different means of transport (carriers) leads to a growing need for real-time video monitoring systems. The significant limitation was that the video feed could only be stored locally and downloaded once the carrier was arrived at the destination. Recently, an important progress has been made for overcoming this challenge, and we are starting to...
A wideband planar array antenna is proposed for Ka-band wireless communication applications in this paper. It consists of several rectangular radiating cavities and a stripline feeding network. Metalized posts are employed to improve the impedance matching. Besides, higher harmonic mode can be suppressed by these metalized posts. A transition from a standard waveguide to a strip line is designed based...
In this paper, we propose a Luneburg lens based multi-beam antenna solution for cellular communications. The solution uses a Luneburg lens fed by an array of appropriately placed dual-polarized radiators. As the coupling between the dual-polarized radiators and the reflections from the Luneburg lens are small, a beam-to-beam isolation of better than 30dB is achieved. Contemporary air interfaces such...
Design of a high gain and broadband circularly polarized array antenna using air cushion and stacked patch technique is presented in this paper. Basic radiating element of the proposed array consists of a driven patch and parasitic patch supported over an air cushion. Driven patch is fed through a microstrip line whereas the parasitic patch is electromagnetically coupled to the lower patch. Using...
A linear three-element slot antenna array with intentionally strong mutual coupling between the elements, a so-called connected array, is presented. By simultaneously feeding all three ports of the array, at different frequencies over an octave bandwidth and with different phases, feed-port reflection coefficients with magnitude larger than one, or negative active feed impedances, can occur. A reactive...
This paper reports on an innovative lens-coupled 2×2 array of broadband on-chip antenna-integrated harmonic receivers in a 0.25µm SiGe BiCMOS technology for multi-color imaging in an ultra-wide frequency band of 0.16–1THz. For the multi-color receiver operation under simultaneous illumination by multiple harmonic signals, the antenna-circuit co-design aspects become crucial. Besides the classical...
This paper addresses the design and the characterization of an innovative antenna so-called crossed dipoles array antenna which is integrated into a broadband compact rectenna operating in the K-band. A dedicated methodology design is presented in order to take into account the impact of the rectifier part of the rectenna on the antenna performances. Simulation and experimental results as well as...
This paper presents a parallel plate waveguide (PPW) Luneburg lens designed using an array of subwavelength circular holes etched on a metallic plate printed on a dielectric substrate. Variation of the hole radius modulates the effective permittivity. The lens operates in the Ka band of frequencies in a quasi-TEM mode. Easy to implement and low cost, the lens could be a good candidate as a lens-like...
This paper presents an efficient rectenna array to harvest ambient wireless energy over a broad bandwidth. An RF field measurement campaign has been undertaken at various locations in the city centre area of Liverpool. The results have been used to identify the available frequency bands and the corresponding power density levels. Thus a new wideband rectenna array has been designed and optimized to...
This paper presents a wideband circularly polarized planar antenna element for both K and Ka bands. The proposed solution is composed by several thin layers of dielectric substrate that allocate two circular stacked patches, a crossed-slot and two fork-shaped feedings. This antenna element is a good candidate for developing high-gain antenna array for the next generation of multimedia services in...
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