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This paper presents a slotted-rectangular patch antenna with proximity-coupled feed operated at dual band of millimeter-wave (mmV) frequencies, 28GHz and 38GHz. The antenna was built in multilayer substrate construct by 10-layers Low temperature Co-fiber Ceramic (LTCC) with 5 mils thickness each. The slotted-patch and thick substrate are configured to enhance the bandwidth and obtain a good result...
We report the intermediate results on a novel slotted waveguide antenna for point-to-point communications at Ka band. The antenna adopts an aperiodic layout with uniformly-excited elements capable of meeting the ETSI class II radiation pattern envelop in all planes with high aperture efficiency. A total of 16 regular waveguide subarrays with an aperiodic inter-column spacing along the E-plane are...
Authors have proposed a printed inverted-F antenna (PIFA) for circular polarization. In this paper, an approach to improve the bandwidth is investigated. It is shown that the bandwidth can be widened by designing the rectangular element loaded at the feeding line as short as possible. The redesigned PIFA in this paper has approximately twice (210MHz) the bandwidth of the 3dB-axial ratio with a 10dB-return...
Wireless cameras can be used to gather situation awareness information (e.g., humans in distress) in disaster recovery scenarios. However, blindly sending raw video streams from such cameras, to an operations center or controller can be prohibitive in terms of bandwidth. Further, these raw streams could contain either redundant or irrelevant information. Thus, we ask "how do we extract accurate...
A Cuboid Dielectric Resonator Antenna fed by microstrip feed line is studied. The dielectric resonator of the antenna is made by a material with high dielectric constant ∊r=30. The impedance matching of dielectric resonator can be improved by using a # slot in the ground. In additional, a two elements array is used to enhance the performance of the antenna. This proposed antenna is suitable for long-term...
A unique hook-shaped conformal metal strip has been used to excite a cylindrical multilayer dielectric resonator antenna (DRA). By using the proposed unique feed and multi dielectric layers, a broadband circular polarization have been achieved over a bandwidth of ∼9.8% in conjunction with an impedance-matching bandwidth of ∼12.8% at same frequency range. The DRA has been successfully designed and...
This study presents design and analysis of a wideband circularly polarized (CP) cylindrical hollow shaped dielectric resonator antenna (DRA) which has been excited with a roman three (m) shaped feed. The proposed feed has been made-up of five metallic strips, which have been optimized to generate a wideband circular polarization. The proposed antenna offers circular polarization over a bandwidth of...
This paper aims to develop an online aggregator of news feeds and posts from social network platforms such as Twitter and Reddit. The developed aggregator, uses Rich Site Summary (RSS) for article indexing, as opposed to web crawling solutions, because RSS is a very popular standardized format for distributing dynamic web content (Extensible Markup Language — XML). In addition to RSS feeds, we index...
This paper proposes a novel approach to design a microstrip patch antenna and to obtain the relationships between physical dimensions of it and its bandwidth. The curve-fitting method is adopted to establish the aforesaid relationship. The antenna is designed to operate in X band region of the entire electromagnetic spectrum and simulated results are verified with respect to the design frequency.
The Square Kilometre Array (SKA) is an ambitious project to build a radio telescope that will enable breakthrough science and discoveries not possible with current facilities. Initially, two telescopes are planned, SKA1-mid and SKA1-low, built over two sites in southern Africa and Western Australia, respectively. Constructed in two phases: SKA1 is being designed now; SKA2 is planned to follow. This...
We will review the latest advances in compact, integrated analog-digital-photonic receivers for radio astronomy. Utilizing a number of novel architectural techniques, such as numerically calibrated digital sideband separation and polarization synthesis, amplitude- and phase-stabilizing reflectionless filters, and unformatted serial data links, these units are ideal for focal plane arrays and phasedarray...
We present our latest advances in antenna miniaturization using dielectric resonators and design of sparse arrays for ultra-wide band applications without the need for non-linear numerical optimization. We experimentally demonstrate a dual-feed, low-profile, stacked dielectric resonator antenna for the C band with wide bandwidth and high gain, as well as a bio-inspired sparse array design for ultra-wide...
In this paper, an effect of truncation shape of left-handed circularly polarized (LHCP) X-band antenna against its axial ratio is investigated. The antenna which is designed to have the center frequency of 8.2GHz and the axial ratio bandwidth of 400MHz is intended to be implemented for satellite communication. It is deployed on an NPC-H220A dielectric substrate with the dielectric constant of 2.17...
An almost square patch, a square patch and a stacked square patch with corner truncation for circular polarization (CP) are researched and developed at X-band for cognitive radios. Experimental results indicate, first, that the impedance bandwidth of a CP almost square patch fed from the edge by a 50 ohm line is 1.70% and second, that of a CP square patch fed from the ground plane side by a surface...
In this paper Rectangular Microstrip antenna is designed for 2.45GHz frequency. For the antenna miniaturization and Bandwidth improvement Dumbbell Shaped DGS on Rectangular Microstrip Patch antenna (RMSA)is used. The Design of DGS has been analyzed for different dimensions of dumbbell-Slot DGS. The Simulation process has been done through Finite Element Machine (FEM) based software Advanced Designing...
To increase the bandwidth of a microstrip antenna, while providing it with a protective outer layer, a structure comprised of two or three stacked radiating elements with several dielectric layers can be employed [1]. The focus of this paper is a method developed to compute the geometric parameters of this type of antenna, coaxially fed, containing up to three stacked conductors and dielectrics. This...
This paper introduces a broadband conductor-backed coplanar waveguide (CBCPW) to double-sided parallel strip line (DSPSL) transition structure. The performance is demonstrated in a back-to-back (B2B) configuration on 0.127 mm thick FR408 with relative permittivity of 3.75 and loss tangent of 0.018. AWR AXIEM and ANSYS HFSS simulations have been used to optimize all the structures. Simulation and measurement...
In this paper, we report the results of a preliminary study of the design of dual-band platform-mounted antennas. In this approach, appropriately-designed coupling elements are employed to excite a desired platform mode to obtain an operating band in the HF frequency range. Moreover, the coupling elements are also designed to act as ultra-wideband radiators within the VHF frequency band. The coupling...
Corrugated horns are widely used in many applications, including radio astronomy, because of their high performance over large bandwidths. However, the always increasing demand for wider frequency coverage cannot be met by traditional conical corrugated horns with typical fabrication constraints at (sub-)mm wavelengths. The usual way to overcome this limitation is to use profiled corrugated horns,...
An investigation of curved contoured beam reflectarrays with reusable surface for multiple coverages is presented. The main advantage of curved reflectarrays over shaped reflectors is that they allow the possibility of reusing a standard parabolic mold for multiple missions. To demonstrate this, two curved reflectarrays are designed using the direct optimization technique to fulfill the requirements...
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