Showing papers on "Folded inverted conformal antenna published in 2006"
TL;DR: The study of internal low-volume antenna structures for mobile terminals shows that the studied antenna concept is a very promising alternative for traditional antenna technologies.
Abstract: In this paper, internal low-volume antenna structures for mobile terminals are studied. The work concentrates on the possibilities to reduce the volume of mobile terminal antenna elements by efficiently utilizing the radiation of the currents on the mobile terminal chassis. Essentially nonresonant coupling elements are used to optimally couple to the dominating char- acteristic wavemodes of the chassis. The antenna structures are tuned to resonance with matching circuits. During the last few years, the approach has achieved growing interest—also among industrial manufacturers of mobile terminals. There exist, how- ever, no systematical feasibility and performance studies of the idea. During the work, two antenna models with very low-volume coupling elements are designed and in total four prototypes are constructed. The simulation and measurement results show that the studied antenna concept is a very promising alternative for traditional antenna technologies. The presented analysis provides useful and novel information for the designs of the future low-pro- file and low-volume mobile terminal antennas.
223 citations
TL;DR: In this article, a single-feed rectangular-ring textile antenna is proposed for wireless body area networks operating in the 2.45 GHz ISM band, where conductive parts of the planar antenna consist of FlecTron/spl reg/, whereas fleece fabric is used as nonconductive antenna substrate.
Abstract: A single-feed rectangular-ring textile antenna is proposed for wireless body area networks operating in the 2.45 GHz ISM band. The conductive parts of the planar antenna consist of FlecTron/spl reg/, whereas fleece fabric is used as non-conductive antenna substrate. This results in a highly efficient, flexible and wearable antenna to be integrated in garments. The robustness of the antenna characteristics with respect to bending is proven.
186 citations
TL;DR: In this article, a compact microstrip fed dual-band coplanar antenna for wireless local area network (WLAN) is presented. The antenna comprises of a rectangular center strip and two lateral strips printed on a dielectric substrate and excited using a 50 Omega microstrip transmission line.
Abstract: A novel compact microstrip fed dual-band coplanar antenna for wireless local area network is presented. The antenna comprises of a rectangular center strip and two lateral strips printed on a dielectric substrate and excited using a 50 Omega microstrip transmission line. The antenna generates two separate resonant modes to cover 2.4/5.2/5.8 GHz WLAN bands. Lower resonant mode of the antenna has an impedance bandwidth (2:1 VSWR) of 330 MHz (2190-2520 MHz), which easily covers the required bandwidth of the 2.4 GHz WLAN, and the upper resonant mode has a bandwidth of 1.23 GHz (4849-6070 MHz), covering 5.2/5.8 GHz WLAN bands. The proposed antenna occupy an area of 217 mm2 when printed on FR4 substrate (epsivr=4.7). A rigorous experimental study has been conducted to confirm the characteristics of the antenna. Design equations for the proposed antenna are also developed
127 citations
TL;DR: In this article, the authors present the results concerning the input return loss, radiation characteristics and efficiency of novel internal, planar, multiband patch antennas for multistandard mobile phone devices.
Abstract: The advent of new, multistandard mobile phone devices is an important challenge for antenna designers, as they have to implement integrated antennas with multiband operation within a volume that is rapidly shrinking. In the paper, research results concerning the input return loss, radiation characteristics and efficiency of novel internal, planar, multiband patch antennas are presented.
125 citations
Abstract: In this paper, we propose a novel modified T-shaped planar monopole antenna in that two asymmetric horizontal strips are used as additional resonators to produce the lower and upper resonant modes. As a result, a dual-band antenna for covering 2.4- and 5-GHz wireless local area network (WLAN) bands is implemented. In order to expand the lower band, a multiband antenna for covering the digital communications systems, personal communications systems, Universal Mobile Telecommunications Systems, and 2.4/5-GHz WLAN bands is also developed. Prototypes of the multiband antenna have been successfully implemented. Good omnidirectional radiation in the desired frequency bands has been achieved. The proposed multiband antenna with relatively low profile is very suitable for multiband mobile communication systems
124 citations
01 Jan 2006
TL;DR: In this article, a dual-band microstrip antenna with a wide frequency bandwidth of approximately 9% has been presented, where two different radiating elements connected together through a matched section and are embedded on a single layer structure.
Abstract: A novel microstrip antenna with wide bandwidth is presented. Two different radiating elements connected together through a matched section and are embedded on a single layer structure. This new structure offers a dual-band microstrip antenna. By controlling the two resonance frequencies of the two elements, a wide frequency bandwidth of approximately 9% has been achieved. A more bandwidth enhancement, up to 12%, has been achieved by adding two parasitic elements to one element of the proposed antenna. Fabrication and measurement of S11 for the proposed antenna has been done. The measured results have been compared with the simulated results using commercial software HFSS version-8.0.
105 citations
105 citations
TL;DR: In this paper, a compact E-shaped microstrip patch antenna, which is significantly smaller than previous e-shaped patch antennas, is presented, and the reduction in area is achieved by introducing corrugations into the two side wings of the Eshaped patch.
Abstract: A compact E-shaped microstrip patch antenna, which is significantly smaller than previous E-shaped patch antennas, is presented. The reduction in area is achieved by introducing corrugations into the two side wings of the E-shaped patch. The new technique is demonstrated by designing a 5-6 GHz corrugated E-shaped patch antenna that is 25% smaller than a conventional design. Despite the small size, the bandwidth of the corrugated antenna is as broad as the conventional antenna
76 citations
Patent•
22 Sep 2006TL;DR: In this article, a multiband antenna device applicable to wide band without using a passive element, and a communication terminal device are provided, where three antenna elements (14a, 14b, 14c) are formed by having an electrically separating interval between a feeding point of a reverse F type antenna and a GND point by forming a slit between them.
Abstract: At least three antenna elements (14a, 14b, 14c) are formed by having an electrically separating interval between a feeding point of a reverse F type antenna and a GND point by forming a slit (15) between them. At least the three antenna elements (14a, 14b, 14c) generate at least three resonance points. At least most of an antenna radiation plate (3) is protruded to the outside not to face a ground bottom board (4). Thus, a multiband antenna device applicable to wide band without using a passive element, and a communication terminal device are provided.
69 citations
TL;DR: In this paper, a conducting polymer patch antenna is fabricated using a screen-printing technique and the measured and simulated results of the resonant frequency, return loss, gain, bandwidth, and radiation patterns are presented.
Abstract: A conducting-polymer patch antenna is fabricated using a screen-printing technique. Polyaniline (Pani) film of conductivity 6000 S/m, permittivity 6000, and thickness 100 μm is used as a radiating patch to realize a microstrip-fed proximity-coupled Pani-patch antenna operating at around 10 GHz. Ansoft-HFSS was used as a design tool to validate the experimental measurements of the antenna. The measured and simulated results of the resonant frequency, return loss, gain, bandwidth, and radiation patterns are presented. The simulations and measurements are performed on both copper- and Pani-antennas for comparison. Details of the design considerations and the simulation and experimental results are presented and discussed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 48: 655–660, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21435
67 citations
TL;DR: In this article, a dual band planar antenna for a digital communication system (DCS)/2.4 GHz WLAN application is presented, in which a longer arm contributes for the lower resonant frequency and a shorter arm for higher frequency.
Abstract: A compact dual band planar antenna for a digital communication system (DCS)/2.4-GHz WLAN application is presented. The two resonant modes of the proposed antenna are associated with various length of the monopoles, in which a longer arm contributes for the lower resonant frequency and a shorter arm for higher resonant frequency. The experimental results show that the designed antenna can provide excellent performance for DCS/2.4-GHz WLAN systems, including sufficiently wide frequency band, moderate gain, and nearly omnidirectional radiation coverage. The outcome of the experimental results along with the design criteria are presented in this letter.
TL;DR: The designed PIFA, which uses a dielectric substrate for the antenna, consists of a U-slot patch for size reduction, several shorting pins, and a coplanar waveguide feeding structure to easily integrate with an RFID chip.
Abstract: This letter presents the design for a low- profile planar inverted-F antenna (PIFA) that can be stuck to metallic objects to create a passive radio frequency identification (RFID) tag in the UHF band. The designed PIFA, which uses a dielectric substrate for the antenna, consists of a U-slot patch for size reduction, several shorting pins, and a coplanar waveguide feeding structure to easily integrate with an RFID chip. The impedance bandwidth and maximum gain of the tag antenna are about 0.3% at 914 MHz for a voltage standing wave ratio (VSWR) of less than 2 and 3.6 dBi, respectively. The maximum read range is about 4.5 m as long as the tag antenna is on a metallic object.
TL;DR: A novel compact planar antenna is presented in this letter, which can operate in five bands: GSM (890-960 MHz), DCS (1710-1880 MHz), PCS (1850-1990 MHz), UMTS (1920-2170 MHz), and WLAN (2400-2484 MHz).
Abstract: A novel compact planar antenna is presented in this letter, which can operate in five bands: GSM (890-960 MHz), DCS (1710-1880 MHz), PCS (1850-1990 MHz), UMTS (1920-2170 MHz), and WLAN (2400-2484 MHz). Consisting of three resonant branches and one tuning branch, the antenna occupies an area of 38.5 times 15 mm2. Due to its two-dimensional (2-D) structure, the antenna is directly printed on the circuit board with low cost, and can be easily integrated with other parts of the circuits of mobile handsets. A prototype has been fabricated and tested, and the experimental results validate the design procedure
IBM1
TL;DR: In this article, a folded dipole antenna for 60 GHz applications with the integration capability in a low-cost plastic packaging technology was presented, where the proximity of the cavity metal walls was used in an input impedance bandwidth enhancement process.
Abstract: The wideband and high efficiency folded dipole antenna for 60 GHz applications with the integration capability in a low-cost plastic packaging technology was presented. The proximity of the cavity metal walls was used in an input impedance bandwidth enhancement process. Moreover, the metal cavity has the potential to make the antenna performance to a large extend insensitive to the surrounding package and PCB-level dielectric and metal structures. The antenna performance showed an extremely low sensitivity to the cavity manufacturing and attachment tolerances which is of special importance at mm-wave frequencies. The ideas presented in this paper are patent pending
TL;DR: The optimization technique followed in this work makes use of genetic algorithm (GA) search concepts and the optimized antenna is designed for high temporal correlation between its electric field intensity signal and the given input signal.
Abstract: A recently proposed optimization procedure, based on the time domain characteristics of an antenna, is exploited to design a planar differential elliptical antenna for ultrawideband (UWB) applications The optimization procedure aims at finding an antenna not only with low VSWR but also one exhibiting low-dispersion characteristics over the relevant frequency band Furthermore, since in pulse communications systems the input signal is often of a given form, suited to a particular purpose, the optimization procedure also aims at finding the best antenna for the given input signal form Specifically, the optimized antenna is designed for high temporal correlation between its electric field intensity signal and the given input signal The optimization technique followed in this work makes use of genetic algorithm (GA) search concepts The electromagnetic analysis of the antenna is done by means of a finite-difference time-domain method using the commercially available CST Microwave Studio software
TL;DR: In this paper, a folded and bent internal loop antenna (FABILA) is proposed for multiband operation with a rectangular stub, feeding post, shorting post, and dielectric supporter on the experimental PCB.
Abstract: A folded and bent internal loop antenna (FABILA) suitable for multiband operation is presented. The proposed antenna consists of a radiating element of the folded and bent loop structure with a rectangular stub, feeding post, shorting post, and dielectric supporter on the experimental PCB. A shorted half-wavelength loop element resonates at the lower-frequency band, and higher-band operation is achieved by two adjacent higher modes. Especially at the second higher-order mode, the rectangular stub compensates the strong imaginary part of the input impedance of the antenna efficiently, so that the antenna can provide enough bandwidth to cover the GSM (880–960 MHz), DCS (1710–1850 MHz), and PCS (1850–1990 MHz) bands. An IE3D simulator is employed to analyze the proposed antenna in the design process and to compare it with the experimental results. The measured peak gains of the proposed antenna are −0.2, 1.5, and 1.1 dBi for GSM, DCS, and PCS, respectively. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 463–467, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21379
TL;DR: A new internal triple-band planar inverted-F antenna (PIFA) is presented, implemented by printing radiating conductors over both sides of an FR4 board, which covers GSM, DCS, and Bluetooth bands.
Abstract: A new internal triple-band planar inverted-F antenna (PIFA) is presented. It is implemented by printing radiating conductors over both sides of an FR4 board. The geometrical parameters and electrical performances of the antenna can be obtained by cutting embedded slots on the patch surfaces and realizing electric via holes between two layers of the patch. This antenna covers GSM (880?960 MHz), DCS (1710?1880 MHz), and Bluetooth (2400?2484 MHz) bands. Features of each band can be easily optimized by tuning the position, shape, and size of the embedded slots and via holes in the radiating patch. The experimental results of the proposed antenna are discussed and compared with simulation results from the available simulator to validate our proposed antenna design.
TL;DR: In this paper, a folded planar metal-plate monopole antenna suitable for operation as a wideband internal antenna for a folder-type mobile phone is presented, which is modeled to comprise an upper ground plane and a lower ground plane, and employed at the hinge position between the upper and lower ground planes.
Abstract: A simple folded planar metal-plate monopole antenna suitable for operation as a wideband internal antenna for a folder-type mobile phone is presented. The folder-type mobile phone is modeled to comprise an upper ground plane and a lower ground plane, and the proposed antenna is employed at the hinge position between the upper and lower ground planes. The antenna has a compact structure and yet generates a wide operating bandwidth of about 4.8 GHz (from about 1.7 to 6.5 GHz), allowing it to easily cover UMTS and WiMAX operations. Details of the proposed antenna are described, and the experimental results of constructed prototypes are presented and discussed. The effects of the various lengths of the upper ground plane on the impedance matching of the antenna are also studied. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 324–327, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21339
TL;DR: A locally conformal finite-difference time-domain numerical procedure has been employed to analyze the radiating structure of the E-shaped microstrip patch antenna to meet the occupation volume requirements of mobile wireless local-area network enabled communication devices.
Abstract: A wideband E-shaped microstrip patch antenna for wireless communications is presented. Zig-zag slots and perturbations of the E-shaped metallic patch are employed to excite two resonant modes and achieve a wide-band frequency behavior, featuring a fractional bandwidth of about 30%, and, at the same time, to meet the occupation volume requirements of mobile wireless local-area network enabled communication devices. A locally conformal finite-difference time-domain numerical procedure has been employed to analyze the radiating structure. Numerical results concerning the antenna parameters are in good agreement with experimental measurements.
TL;DR: In this paper, a planar inverted F antenna (PIFA) with two shorting strips for 2.4/5.2 GHz wireless local area network (WLAN) operations is presented.
Abstract: A compact wideband modified planar inverted F antenna (PIFA) with two shorting strips for 2.4/5.2-GHz wireless local area network (WLAN) operations is presented. As a starting point, two-branch strip lines derived from the dipole antenna structure are used to achieve the desired resonant frequency. One of them is connected to two shorting strips with the different length and width, and those strips generate additional resonant modes. A wideband characteristic can be optimized by tuning the parts of two shorted patches and size of each strip line segment. The proposed antenna has a low profile and can easily be fed by a 50-Omega coaxial cable. In addition to covering 2.4- and 5.2-GHz band, a wide impedance bandwidth from 2.94 to 5.82 GHz (|S11|<-10 dB, about 69% centered at 4.14 GHz) is obtained. The measured maximum radiation gains at the frequencies of 2.44, 4.14, and 5.2 GHz are about 1.6, 3.8, and 2.5 dBi, respectively. The proposed antenna is suitable for the multiband operations, covering 2.4/5.2-GHz WLAN operation
TL;DR: In this paper, a planar inverted F-antenna was proposed for the GSM/GPS/DCS1800/DCS1900/IMT2000/WLAN/DMB service bands.
Abstract: The development of a small electrical antenna plays an important role in the rapidly growing mobile communication market. This paper presents the design of a novel small and wideband planar inverted F-antenna that simultaneously covers the GSM900/GPS/DCS1800/DCS1900/IMT2000/WLAN/DMB service bands. A very wide impedance-bandwidth characteristic was achieved by optimizing both the distance between the feed line and short strip and the width of a short strip. The commercial electromagnetic software CST Microwave Studio is used to design the structure. The maximum gains at the frequencies of 915, 1850, 2025, and 2450 MHz were 1.79, 3.56, 3.65, and 1.67 dBi, respectively. The overall radiation pattern is suitable for mobile application. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 947–950, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21528
TL;DR: In this paper, an effective technique is presented to enhance the bandwidth and reduce the size of an ultralow-profile microstrip antenna by loading multicouple staggered slots on the patch and using inset feed structure, two TM10 modes can be excited at two close frequencies and matched well simultaneously.
Abstract: An effective technique is presented to enhance the bandwidth and reduce the size of an ultralow-profile microstrip antenna. By loading multicouple staggered slots on the patch and using inset feed structure, two TM10 modes can be excited at two close frequencies and matched well simultaneously. Designs based on the structures with four-, five-, and six-couple staggered slots have been made to demonstrate the effective technique. To the best designed results, the presented ultralow-profile microstrip antenna obtains a bandwidth enhancement of about two times and a size reduction of about 60% compared with the ordinary one. The technique is suitable for radio-frequency front-end antenna integration and package in microwave and millimeter-wave bands
Patent•
14 Dec 2006TL;DR: A multiband antenna includes an antenna portion having a front surface and a back surface, and a ground plane located adjacent to the antenna portion as mentioned in this paper, where the ground plane is connected to the front surface.
Abstract: A multiband antenna includes an antenna portion having a front surface and a back surface and a ground plane located adjacent to the antenna portion. The multiband antenna includes a front surface side element arranged on the front surface side and connected to a feeding point. The back surface side element arranged on the back surface side and connected to the ground plane.
TL;DR: In this article, a planar inverted-F antenna (PIFA) suitable for distributed radio-over-fiber (ROF) networks is modified into planar structure.
Abstract: A compact multiband planar inverted-F antenna (PIFA) suitable for distributed radio-over-fiber repeater networks is modified into a planar structure. It is shown that the planar antenna performance is not degraded with respect to the original PIFA and further, a two layer design is demonstrated to offer improved feed matching. The European bands for GSM, DCS-1800, DECT, UMTS, Bluetooth and HiperLAN2 are all covered. A model of the antenna is introduced as a first stage to developing an equivalent circuit
Patent•
05 Jun 2006
TL;DR: In this article, a multi-mode parasitic antenna array has at least two resonant modes resulting in substantially divergent radiation patterns, thereby providing the antenna with frequency dependent directivity.
Abstract: A multi-mode parasitic antenna array having two or more resonant frequencies. The multi-mode parasitic antenna array has at least two resonant modes resulting in substantially divergent radiation patterns, thereby providing the antenna with frequency dependent directivity. The array may be incorporated into a tag for an RFID system. The RFID system includes a reader capable of interrogating the tag at each of the resonant frequencies.
TL;DR: In this article, a folded slot with open end is introduced to achieve a dual-band coplanar waveguide (CPW)-fed monopole antenna for radio frequency identification (RFID) applications.
Abstract: A folded slot with open end is introduced to achieve a dual-band coplanar waveguide (CPW)-fed monopole antenna for radio frequency identification (RFID) applications. The designed antenna, which, including the substrate, is only 32 mm in height and 20 mm in width, can operate simultaneously at the 2.45 and 5.8 GHz bands with −1.8 and 2.3 dBi gains, respectively. Its properties make the antenna suitable for RFID tags.
TL;DR: In this paper, a thin, multiply folded, electrically small antenna was proposed for achieving high efficiency in a physically compact size, and a prototype antenna has been built and measured at 150 MHz.
Abstract: The design of a thin, multiply folded, electrically small antenna is proposed for achieving high efficiency in a physically compact size. A prototype antenna has been built and measured at 150 MHz. The achievable efficiency of the multiply folded design is found to be superior to that of the inductively coupled feed design.
TL;DR: In this article, a printed triple-band monopole antenna appropriate for use as a terminal antenna in modern wireless multiband systems is proposed and the impedance bandwidth of each band has been optimized using a quasi-Newton technique and the bandwidth includes virtually all wireless bands.
Abstract: A printed triple-band monopole antenna appropriate for use as a terminal antenna in modern wireless multiband systems is proposed. The impedance bandwidth of each band has been optimised using a quasi-Newton technique and the bandwidth includes virtually all wireless bands. Various parameter sweeps are presented which improve our understanding of the antenna, in particular, the effect of groundplane-size and branch-off point on impedance bandwidth and radiation pattern. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 613–615, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21423
TL;DR: In this article, a quasi-omnidirectional low-profile microstrip antenna element was integrated into a laptop computer to achieve a good total power radiation pattern omnidirectionality and an adequate coverage of the whole 2.4 GHz ISM band.
Abstract: The integration of a novel quasi-omnidirectional low-profile microstrip antenna element into laptop computers is proposed. The antenna structure is obtained by wrapping a patch element around the top edge of the laptop screen. The antenna is fed by a microstrip inverted line, which can be easily integrated inside the plastic display cover. Experimental results show that very good total power radiation pattern omnidirectionality and an adequate coverage of the whole 2.4-GHz ISM band are achieved. An antenna with six elements and low-mutual coupling, aiming at multiple-input?multiple-output (MIMO) arrangements, has been fabricated and tested. Experimental results confirm the fulfillment of the requirements for MIMO applications in laptops.
TL;DR: In this article, a planar inverted-F antenna (PIFA) for handheld terminals is presented, which is made of capacitively loaded shorted patches, a slot, and an efficient antenna-chassis combination to achieve multiband and wideband performances.
Abstract: A compact pentaband planar inverted-F antenna (PIFA) suitable for handheld terminals is presented. This antenna is made of capacitively loaded shorted patches, a slot, and an efficient antenna-chassis combination to achieve multiband and wideband performances to operate in the 850 MHz, 900 MHz, 1800 MHz, 1900 MHz, and UMTS bands. Matching, radiation properties, and efficiency show that this antenna is suitable for these mobile communication standards. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1509–1512, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21717