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Ultra-Miniature UHF Antenna using Magneto-dielectric Material
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This paper introduces an ultra-miniature UHF antenna. The design combines different technologies to reduce the size:(meta-material inspired shape, use of a magneto-dielectric material as antenna support, use of an active component and a passive matching network for frequency tuning and impedance matching over the whole UHF band.) This antenna has been simulated and measured on nomad type terminal well suited for video applications.
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... J.F. Pintos et al. (2010) introduced a compact UHF band antenna integrated into a portable terminal using meta-material shape, magnetodielectric material, variable capacitance diode, and matching network. HFSS simulations confirmed adherence to constraints and minimal insertion losses. ...
The study of metamaterials has experienced rapid growth, particularly with the discovery of left-handed metamaterials. One promising technology for controlling electromagnetic waves in small structures is transmission-line metamaterial (TL-MTM), which can accurately determine various parameters, such as working frequency, bandwidth, and phase offsets. Antennas are essential components for receiving and transmitting signals in RF systems. Although the microstrip antenna is a popular choice due to its low cost and ease of manufacturing, it is limited in terms of size and frequency range. In this chapter, more than 100 papers are reviewed based on their methodology and performance to discuss various techniques for improving antenna performance, such as the use of artificial neural networks (ANN) and metamaterials. The insights presented in this chapter will aid in identifying, analyzing, and synthesizing the latest developments in the field of metamaterials.
... In order to obtain a broad impedance bandwidth while maintaining the compact size of a miniaturized antenna, studies have introduced the magneto dielectric (MD) materials to the antennas [11][12][13][14][15][16][17][18]. The antenna size reduction and bandwidth improvement were achieved using the MD materials with moderate permittivity and permeability. ...
This research presents a miniaturized wideband meander line antenna (MLA) using a magneto dielectric (MD) material for mobile device applications. The proposed MLA attached the lower and upper ground planes of the folder-type chassis, connected electrically by grounding strip. The MD material (ECCOSORB MF-124) was subsequently loaded onto the coupling element area of the MLA. The MD-laden MLA was ultracompact (10 mm × 25 mm × 1 mm), with the electrical size of 0.015 λ × 0.039 λ × 0.0015 λ at 470 MHz. The surface current distribution was simulated to determine the optimal parameters of the MD-laden MLA. To verify, a prototype antenna was fabricated and the experiments were performed. The measured impedance bandwidth ( S11<−6 dB) covered the frequency range of 467–1012 MHz (73.6%), with an omnidirectional radiation pattern. The radiation efficiency was in excess of 90%, rendering it suitable for the DVB-H/LTE13/GSM850/900 applications.
... In this manner, magneto-dielectric material offers a larger number of parameters of dielectrics to improve the performance and some characteristics of antennas as per the requirements for numerous applications [5]. By using such types of materials the matching and radiation efficiency is improved and it also provides low mutual coupling and a higher rejection level [6][7][8][9][10][11]. ...
This paper presents a two-element MIMO antenna configuration designed using magneto-dielectric (MD) material. The MD material has been designed such that its temperature coefficient value approaches zero. The microwave dielectric constant and permeability of the material is calculated by Nicholson-Ross-Weir conversion technique and found to be 8.02 and 1.64, respectively. Each element is designed so that it can operate at 5.71 GHz. The two elements of the MIMO configuration are separated by quarter wavelength and half wavelength and are compared. The designed antenna can give a quad-directional radiation property, which can be utilized for the diversity scheme.
Recent progress in microstrip antennas has improved their size and efficiency, particularly in mobile, satellite, and Wi-Max technologies. These enhancements are crucial for advancing wireless communication systems, benefiting applications like telemedicine and GPS technology. The chapter introduces a dual-band unit cell of frequency selective surface (FSS) resonating at 4 GHz and 5.5 GHz, using a combination of I-shaped and modified I-shaped metal strips for dual-band filtering. The research focuses on individual shape analyses and aims to contribute to the development of compact and efficient dual-band FSS designs. The research introduces a dual-band FSS unit cell resonating at 4 GHz and 5.5 GHz, combining I-shaped, H shaped, and modified I-shaped and H shaped metal strips for dual-band filtering. The proposed FSS design, with a 10x10 mm2 unit cell dimension and FR-4 dielectric, exhibits broad frequency band characteristics, aligning well with simulated and measured results.
Le nombre de cancers et notamment de cancers photoinduits étant en augmentation, il est indispensable d’identifier de nouvelles molécules protectrices de type filtres UV, réparatrices vis-à-vis des altérations de l’ADN mais également favorisant la réponse pigmentaire. Les lichens sont des organismes originaux qui possèdent des qualités de résistance remarquables aux rayonnements solaires dues notamment à la production de métabolites photoprotecteurs tels que les mycosporines. A partir de ce motif structural original, nous avons synthétisé divers analogues par catalyse à l’or en utilisant un outil de la chimie théorique (TD-DFT) pour orienter les synthèses. Les premières évaluations de leurs propriétés physico-chimiques des molécules ont montré des activités prometteuses.
Planar inverted F antennas are well known and widely used in the mobile communication industry. The rapid growth and high demand in the high performance mobile devices, with weight constraint, low specific absorption rate has put a challenge to the scientific community. Introduction of metamaterials as substrate or superstrate can be a revolution to this challenging task. This chapter provides an insight to the design and development of metamaterial based PIFA systems with low specific absorption rate. Various metamaterial structures have been designed and the effect on the return loss characteristics has been detailed in this chapter.
A dual band PIFA antenna for portable devices is presented. It operates in the 450 LTE (449 − 461 MHz) and GSM 900 (876 – 922 MHz) frequency bands. The proposed antenna which has a very compact size of
7 (0.01λ0) × 7 × 70 (0.1λ0) mm3 and is suitable to integrate in small envelopes, consists of two
branches and a metallic patch. The low cost and easily fabricated antenna offers high total efficiency and gain in both bands. Measured and simulated results are provided.
In the present work two element magneto-dielectric resonator antenna configuration, designed using two different magneto-dielectric (MD) materials, separated by a distance of quarter wavelength (lambda/4) and half wavelength (lambda/2) has proposed. These materials have been designed such that their temperature coefficient value approaches to zero. The microwave dielectric constant (er) and permeability (mu(r)) of both materials are calculated by Nicholson-Ross-Weir conversion technique and found to be 8.02, 1.64 and 10.47, 1.52, respectively. For the inter element separation of lambda/4 and lambda/2, the first resonant frequencies of proposed antenna are 5.75 GHz and 5.78 GHz and showing penta-directional and tri-directional radiation patterns characteristics respectively. This property can be utilized for the diversity scheme to mitigate the problem of fading.
In this issues Wireless Corner column, the authors present a compact, low-cost
antenna to be used in smart metering or smart grid devices in the lower ultrahighfrequency
band. This low-frequency band has the advantage of providing larger coverage
areas, but designing a compact antenna is challenging. The proposed antenna
is a meander-line-folded monopole antenna that exhibits a stable radiation pattern
and good radiation efficiency. The work shows how well the antenna performs despite
material loading and when installed on a concrete wall.
In this paper two distinct methodologies in achieving miniaturized antennas for wireless applications are described. One method is based on defining novel topology of radiating elements that can easily be incorporated into monolithic circuits and the other method is based on embedding radiating structures within novel electromagnetic materials. Examples of extremely small planar antennas using both methods are demonstrated.
A built-in antenna for a USB key like digital terrestrial TV receiver allowing free to air reception of digital terrestrial TV on a computer PC has been designed, realized and tested. The housing of the compact receiver is used as part of the antenna. The antenna design is optimized so that it covers the whole UHF frequency bandwidth with good radiation efficiency, while its size is imposed by the USB-key form factor. The obtained results are compliant with simulations
Electromagnetic properties of nickel–zinc ferrites based materials make them potential candidates for applications linked to telecommunications. In the present study, nanosized particles of spinel ferrite Ni <sub>0.5</sub> Zn <sub>0.3</sub> Co <sub>0.2</sub> Fe <sub>2</sub> O <sub>4</sub> were prepared by coprecipitation method. An optimized material is obtained after adequate heat treatment and partial filling of the porosity by epoxy resin. This material lies between ceramic and composite medium (with porosity close to 40%), and shows almost constant complex permeability and permittivity in the frequency range from 0.1–0.7 GHz, and equal to ∼3.5 -j 0.15 (loss tangent ∼0.04 ) and ∼4 -j 0.2 (loss tangent ∼0.02 ), respectively. The refractive index n is close to 3.75. These electromagnetic properties, in particular the low levels of losses, show that this material could be useful to the design of miniaturized antennas in the VHF-uhf (300–700 MHz) range of frequency.
This article presents an inexpensive, efficient, and electrically-small antenna design that is based on a metamaterial-inspired structure driven by an electrically-small semi-circular loop antenna, which is coaxially-fed through a finite ground plane. The proposed antenna system is linearly scalable over a wide frequency spectrum. The design details and radiation characteristics of the antenna system at 300, 1580, and 6000 MHz are reported. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1287–1290, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22415
With the advent of the computer and automatic test equipment, new techniques for measuring complex dielectric constant (ε) and permeability (µ) can be considered. Such a technique is described where a system is employed that automatically measures the complex reflection and transmission coefficients that result when a sample of material is inserted in waveguide or a TEM transmission line. Measurement results of ε and µ for two common materials are presented.
MBRAI-02-16 "Front-end and Antenna External Specification Mobile and Portable DVB-T Radio Access Interface Specification
- European Industry Associate
- Eicta Tca
Revisiting the Q factor of PIFA antennas for dielectric and magnetic media
- C Niamien
- S Collardey
- A-C Tarot
- K Mahdjoubi
C. Niamien, S. Collardey, A-C. Tarot, K. Mahdjoubi "Revisiting the Q
factor of PIFA antennas for dielectric and magnetic media" 2nd
International Congress on Advanced Electromagnetic Materials in
Microwaves and Optics, September 21-26, 2008, Pamplona, Spain.
Automatic measurement of complex dielectric constants and permeability at microwave frequencies
- W B Weir
W. B. Weir, "Automatic measurement of complex dielectric constants
and permeability at microwave frequencies", Proceedings of the IEEE,
vol. 62, N°1, pp. 33-36, January 1974.