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Journal ArticleDOI

Dual-band planar inverted F antenna for GSM/DCS mobile phones

TL;DR: In this article, a dual-band planar inverted F antenna suitable for the application as a global system for mobile communication/digital communication system (GSM/DCS) dualband mobile phone internal antenna is proposed and implemented.
Abstract: A compact dual-band planar inverted F antenna suitable for the application as a global system for mobile communication/digital communication system (GSM/DCS) dual-band mobile phone internal antenna is proposed and implemented. The proposed antenna has three resonant elements, two meandered metallic strips of slightly different lengths and one nearly-rectangular patch, which are printed on a supporting FR4 substrate and arranged in a compact configuration. These three resonant elements share a common shorting pin, and for the GSM (890-960 MHz) operation, the proposed antenna is operated with the two meandered strips both resonated as a quarter-wavelength structure, leading to a wide bandwidth formed by two resonant modes. For the upper band of the proposed antenna, three resonant modes are generated, two from the second higher-order modes of the two meandered strips and one from the nearly-rectangular patch, leading to a wide bandwidth covering the DCS band (1710-1880 MHz). The antenna design and experimental results are presented.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a planar and coplanar waveguide (CPW)-fed dual-band antenna is designed and proposed using composite metamaterial, which consists of an inner split-ring resonator (SRR) and an outer closed-ring Resonator (CRR).
Abstract: A novel compact, planar, and coplanar waveguide (CPW)-fed dual-band antenna is designed and proposed using composite metamaterial. Such composite metamaterial consists of an inner split-ring resonator (SRR) and an outer closed-ring resonator (CRR). The composite metamaterial can provide dual-band operation at 2.595-2.654 and 3.185-4.245 GHz with reflection coefficient better than -10 dB by the two resonant modes of SRR and CRR, respectively. A CPW-fed line with trapeziform ground plane and tapered impedance transformer line is employed to improve the impedance matching of the antenna. The uniqueness of this design is that the inner SRR with size much smaller than the resonant wavelength is used for obtaining the lower narrow frequency band, which makes the dual-band antenna very compact. Antenna parameters, including reflection coefficient, radiation pattern, radiation efficiency, and gain, are analyzed with numerical simulation and experimental measurement. Good agreement between the simulation and measurement is observed.

123 citations


Cites background from "Dual-band planar inverted F antenna..."

  • ..., L-shaped or U-shaped slots) on the surface of a planar antenna or shortening pins, the planar antenna can be operated in two frequency bands [7]–[11]....

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Journal ArticleDOI
TL;DR: In this article, a dual/triple-band microstrip antenna with an asymmetric M-shaped patch was proposed for the purpose of compactness and separating of the operational bands.
Abstract: Novel designs for compact dual/triple-band microstrip antennas are proposed with an asymmetric M-shaped patch. The designs utilize vias on the longer arm of the patch for the purposes of compactness and separating of the operational bands. As the two resonant frequencies of antenna 1 are related to certain parts of the patch, one resonant frequency can be flexibly tuned with little effect on the other. A prototype of antenna 1 operating at 2.44 and 5.77 GHz is fabricated and measured. It has a low profile of 0.016 λr1, where λr1 is the wavelength of the first resonant frequency fr1 = 2.44 GHz at free space, and a compact patch size of 0.195 λr1 × 0.177 λr1. The antenna also presents low cross polarization and symmetrical patterns in both E- and H-planes. Finally, a triple-band antenna (antenna 2) with enhanced bandwidth is designed.

84 citations

Journal ArticleDOI
TL;DR: In this article, a planar inverted-F antenna (PIFA) consisting of two meandered strips with bandwidth enhancement technique is proposed for implantable biotelemetry in MICS band.
Abstract: A compact planar inverted-F antenna (PIFA) consisted of two meandered strips with bandwidth enhancement technique is proposed for implantable biotelemetry in MICS band. The antenna occupies a volume of only 791 mm3 (22.5 mm by 18.5 mm by 1.9 mm) operating at 402 MHz. PIFA with two meandered strips can excite dual-resonate frequencies that control the resonant frequencies at 380 and 440 MHz, respectively, to obtain the broad bandwidth of 120 MHz (353–473 MHz) at a return loss of 10 dB. To verify the performance of implantable antenna, the test tissue is adopted as implanting environment by grinding the pork of front-leg. Furthermore, the property of this antenna can remain consistency against the varying and complex human tissue. Thus, this letter provides a miniature, broadband implantable PIFA for biotelemetry of medical devices. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 749–752, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24189

83 citations

Journal ArticleDOI
08 Mar 2012
TL;DR: The design considerations of antenna from a WiFi system perspective with state-of-the-art solutions with diversity characteristics, particularly for access points and portable devices, are described.
Abstract: Wireless fidelity (WiFi) is a superset of the IEEE 802.11 standards for communications over several tens of meters. A WiFi device connects to the network via an access point. The design of commercial WiFi antennas is a compromise between cost, size, manufacturability, and performance. This paper describes the design considerations of antenna from a WiFi system perspective with state-of-the-art solutions. The omnidirectional and multiband antenna solutions with diversity characteristics, particularly for access points and portable devices, are discussed. Case studies of a compact multiband antenna with omnidirectional coverage for access point application and a dual-band antenna system for portable devices are presented.

57 citations


Additional excerpts

  • ..., to achieve the dual-band performance [42]–[46]....

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Journal ArticleDOI
TL;DR: In this paper, an inverted FL antenna (InvFLA) is analyzed to obtain dual-frequency operation at 2.45 GHz and 5.2 GHz for a VSWR=2 criterion.
Abstract: An inverted FL antenna (InvFLA) is analyzed to obtain dual-frequency operation at 2.45 and 5.2 GHz (wireless LAN system frequencies). The InvFLA is composed of inverted FL elements, a parasitic element, and a ground plate, where these lie in the same plane, i.e., the structure is a card-type structure having a co-planar ground plate. The antenna height above the ground plate is very small: 5.5 mm=0.045 wavelength at 2.45 GHz. The analysis shows that the InvFLA has a 4.1% bandwidth around 2.45 GHz and a 31.8% bandwidth around 5.2 GHz, both for a VSWR=2 criterion. The gain is calculated to be 0.9 dBi at 2.45 GHz and 1.7 dBi at 5.2 GHz, with a small gain variation in each of the VSWR bands.

56 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the authors proposed a planar dual-band inverted-F antenna for cellular handsets, which operates at the 0.9-GHz and 1.8-GHz bands.
Abstract: Cellular telephone handsets are now being designed to have dual-mode capabilities. In particular, there is a requirement for internal antennas for GSM and DCS1800 systems. This paper describes a novel planar dual-band inverted-F antenna for cellular handsets, which operates at the 0.9-GHz and 1.8-GHz bands. The dual-band antenna has almost the same size as a conventional inverted-F antenna operating at 0.9 GHz and has an isolation between bands of better than 17 dB. The bandwidths of the antenna are close to those required for the above systems. Good dual-band action is also obtained for other frequency ratios in the range of 1.3-2.4. Studies also show that the dual-band antenna can operate with one or two feeds. A finite-difference time-domain analysis has been shown to give calculated results close to those measured.

447 citations

Journal ArticleDOI
TL;DR: In this article, the design of a compact PIFA suitable for operation at 900 MHz was described, and modifications to this design were provided to operate in dual-frequency bands at 300 and 1800 MHz.
Abstract: Planar inverted F antennas (PIFA) have been proposed as possible candidates for mobile telephone handsets. We describe the design of a compact PIFA suitable for operation at 900 MHz. In addition, we provide modifications to this design that allow it to operate in dual-frequency bands at 300 and 1800 MHz. Finite-difference time-domain (FDTD) and experimental results are provided.

289 citations


"Dual-band planar inverted F antenna..." refers methods in this paper

  • ...To enhance the impedance bandwidth, several techniques have also been demonstrated; they include the adding of a shorted parasitic patch to generate an additional resonant mode for either the lower or the upper band [3], [8], or the use of a capacitive feed instead of the conventional probe feed used [ 6 ], or the introduction of a capacitive loading formed between the radiating patch and the ground to improve the impedance matching [1], ......

    [...]

  • ...... the impedance bandwidth, several techniques have also been demonstrated; they include the adding of a shorted parasitic patch to generate an additional resonant mode for either the lower or the upper band [3], [8], or the use of a capacitive feed instead of the conventional probe feed used [6], or the introduction of a capacitive loading formed between the radiating patch and the ground to improve the impedance matching [1], [3], [ 6 ], and ......

    [...]

  • ...GSM and DCS dual-band operations of these PIFA designs are obtained by inserting an L-shaped or a folded slit [1] or by embedding a U-shaped slot [2] in the antenna’s radiating patch or by using two folded radiating patches of different dimensions [3]‐[ 6 ] or by meandering the radiating patch using several narrow linear slits [7], [8]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the effects of several phone chassis-related parameters-length, width, thickness, and distance between the head and phone-on the bandwidth, efficiency, and specific absorption rate (SAR) characteristics of internal mobile phone antennas are investigated.
Abstract: This paper presents a thorough investigation into the effects of several phone chassis-related parameters-length, width, thickness, and distance between the head and phone-on the bandwidth, efficiency, and specific absorption rate (SAR) characteristics of internal mobile phone antennas. The studied antenna-chassis combinations are located beside an anatomical head model in a position of actual handset use. The effect of the user's hand is also studied with two different hand models. The main part of the study is based on FDTD simulations, but also experimental results, which support the computationally obtained conclusions, are given. The presented analysis provides novel and useful information for future design of mobile handset antennas. The results show the general trends of bandwidth, SAR, and efficiency with different chassis parameters. The results also reveal a connection between these three performance parameters: an increase in SARs and a decrease in radiation efficiency occur compared to the general trend when the bandwidth reaches its maximum. This happens when the resonant frequency of the chassis equals that of the antenna.

213 citations

Journal ArticleDOI

124 citations


"Dual-band planar inverted F antenna..." refers background or methods in this paper

  • ...The dimensions of patch 1 can be roughly determined from [ 2 ] and [5]...

    [...]

  • ...GSM and DCS dual-band operations of these PIFA designs are obtained by inserting an L-shaped or a folded slit [1] or by embedding a U-shaped slot [ 2 ] in the antenna’s radiating patch or by using two folded radiating patches of different dimensions [3]‐[6] or by meandering the radiating patch using several narrow linear slits [7], [8]....

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Proceedings ArticleDOI
16 Jul 2000
TL;DR: An internal dual-band mobile phone antenna designed to operate at GSM900 and GSM1800 bands is presented in this paper, which is derived from a quarter-wave planar inverted F-type antenna, which has proved to be the most promising candidate for mobile applications due to its compact size and good performance.
Abstract: An internal dual-band mobile phone antenna designed to operate at GSM900 and GSM1800 bands is presented. The antenna is derived from a quarter-wave planar inverted F-type antenna, which has at this state proved to be the most promising candidate for mobile applications due to its compact size and good performance. The FDTD method is used in the study and an experimental verification is also provided.

104 citations


"Dual-band planar inverted F antenna..." refers background or methods in this paper

  • ...To provide dual-band internal antennas for mobile phones of modern communications systems such as the global system for mobile communication (GSM) [890‐960 MHz] and digital communication system (DCS) [1710‐1880 MHz], a variety of antenna designs based on the planar inverted F antenna (PIFA) have been reported [ 1 ]‐[8]....

    [...]

  • ...To enhance the impedance bandwidth, several techniques have also been demonstrated; they include the adding of a shorted parasitic patch to generate an additional resonant mode for either the lower or the upper band [3], [8], or the use of a capacitive feed instead of the conventional probe feed used [6], or the introduction of a capacitive loading formed between the radiating patch and the ground to improve the impedance matching [ 1 ], ......

    [...]

  • ...GSM and DCS dual-band operations of these PIFA designs are obtained by inserting an L-shaped or a folded slit [ 1 ] or by embedding a U-shaped slot [2] in the antenna’s radiating patch or by using two folded radiating patches of different dimensions [3]‐[6] or by meandering the radiating patch using several narrow linear slits [7], [8]....

    [...]