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Planar Antennas for Wireless Communications

06 Jan 2003-
TL;DR: Very low profile monopoles for Internal Mobile Phone Antennas for WLAN applications are discussed in this paper, along with the integration of antennas for different operating Bands and a summary of acronyms.
Abstract: Preface. Introduction and Overview. PIFAs for Internal Mobile Phone Antennas. Very-Low-Profile Monopoles for Internal Mobile Phone Antennas. Base Station Antennas for Cellular Communication Systems. Antennas for WLAN Applications. Dielectric Resonator Antennas for Wireless Communications. Integration of Antennas for Different Operating Bands. Appendix: Summary of Acronyms. Index.
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Journal ArticleDOI
TL;DR: In this paper, the authors summarize the work that has been developed by the authors for the last several years, in order to demonstrate that the Theory of Characteristic Modes can be used to perform a systematic design of different types of antennas.
Abstract: The objective of this paper is to summarize the work that has been developed by the authors for the last several years, in order to demonstrate that the Theory of Characteristic Modes can be used to perform a systematic design of different types of antennas. Characteristic modes are real current modes that can be computed numerically for conducting bodies of arbitrary shape. Since characteristic modes form a set of orthogonal functions, they can be used to expand the total current on the surface of the body. However, this paper shows that what makes characteristic modes really attractive for antenna design is the physical insight they bring into the radiating phenomena taking place in the antenna. The resonance frequency of modes, as well as their radiating behavior, can be determined from the information provided by the eigenvalues associated with the characteristic modes. Moreover, by studying the current distribution of modes, an optimum feeding arrangement can be found in order to obtain the desired radiating behavior.

565 citations


Cites background or methods from "Planar Antennas for Wireless Commun..."

  • ...In addition, as new mobile handsets are required to operate with multiple standards, their antennas are expected to grab as much spectrum as possible, so they may provide multi-band or broadband operation [5]....

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  • ...In patch-antenna design, the insertion of narrow slits at the patch's nonradiating edges is a commonly used technique for obtaining compact antennas [5]....

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  • ...PLEAs are quarter-wavelength resonating antennas that can be considered to be probe-fed shorted patches over an infinite ground plane [5]....

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Journal ArticleDOI
TL;DR: In this article, a new internal multiband mobile phone antenna formed by two printed monopole slots of different lengths cut at the edge of the system ground plane of the mobile phone is presented.
Abstract: A new internal multiband mobile phone antenna formed by two printed monopole slots of different lengths cut at the edge of the system ground plane of the mobile phone is presented. The antenna can generate two wide bands centered at about 900 and 2100 MHz to cover the GSM850/GSM900/DCS/PCS/UMTS bands and the 2.4-GHz WLAN band. Further, the antenna has a simple planar structure and occupies a small area of only. It is also promising to bend the antenna into an L shape to reduce its volume occupied inside the mobile phone. Good radiation characteristics are obtained over the two wide operating bands.

227 citations


Cites background or result from "Planar Antennas for Wireless Commun..."

  • ...This is an advantage over the internal patch antennas that have been applied in many mobile phones [10]....

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  • ...This pattern characteristic is similar to those observed for the conventional internal mobile phone patch antenna for GSM operation [10], [16]....

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Journal ArticleDOI
A. Cabedo1, Jaume Anguera1, Cristina Picher, M. Ribo1, Carles Puente 
TL;DR: In this article, a multiband handset antenna combining a PIFA and multiple slots on a ground plane is presented, and it is shown by means of simulations that the slots on the ground plane have a double function: to tune ground plane resonance at low frequencies and to act as parasitic radiators at high frequencies.
Abstract: A multiband handset antenna combining a PIFA and multiple slots on a ground plane is presented. It is shown by means of simulations that the slots on the ground plane have a double function: to tune the ground plane resonance at low frequencies (f ? 900 MHz) and to act as parasitic radiators at high frequencies (f ? 1800 MHz). A prototype is designed and built featuring a behavior suitable for low frequencies (GSM850 and GSM900) and for high frequencies spanning from DCS1800 to Bluetooth, and including, for instance, PCS1900, UMTS2000, and other possible systems. Reflection coefficient, efficiency, and radiation patterns are measured and compared with a design without slots to prove the advantages of the slotted ground plane. The component effect is investigated to determine critical areas where the placement is not recommended. Besides, the effect of the slot of the ground plane on SAR is investigated, by discussing the effect of the ground plane and slot modes for two phone positions. The total antenna volume of the proposed design is 40 × 15 × 6 mm3.

225 citations


Cites background from "Planar Antennas for Wireless Commun..."

  • ...Most of the work has been done on antenna design [3], but the ground plane (both its dimensions and its...

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Patent
31 Aug 2005
TL;DR: In this paper, the authors proposed a multiband antenna array for cellular base stations, which provides a reduced width of the base station antenna and minimizes the environmental and visual impact of a network of cellular base station antennas, in particular in mobile telephony and wireless service networks.
Abstract: This invention is in the field of base station antennas for wireless communications. The present invention refers to a slim multi-band antenna array for cellular base stations, which provides a reduced width of the base station antenna and minimizes the environmental and visual impact of a network of cellular base station antennas, in particular in mobile telephony and wireless service networks. A multiband antenna array comprises a first set of radiating elements operating at a first frequency band and a second set of radiating elements operating at a second frequency band, said radiating elements being smaller than λ/2 or smaller than λ/3, being (λ) the longest operating wavelength. The ratio between the largest and the smaller of said frequency bands is smaller than 2.

208 citations

Journal ArticleDOI
TL;DR: In this article, a small-size printed planar inverted-F antenna (PIFA) operated at its one-eighth wavelength (lambda/8) mode as the fundamental resonant mode for achieving WWAN (wireless wide area network) operation in the mobile phone is presented.
Abstract: A small-size printed planar inverted-F antenna (PIFA) operated at its one-eighth wavelength (lambda/8) mode as the fundamental resonant mode for achieving WWAN (wireless wide area network) operation in the mobile phone is presented. The proposed PIFA has a simple structure of comprising two radiating strips of length about lambda/8 at 900 MHz and is fed using a coupling feed. Compared to the traditional PIFA using a direct feed, the coupling feed greatly decreases the very large input impedance seen at the lambda/8 mode for the traditional PIFA and results in successful excitation of the lambda/8 mode for the proposed PIFA. Two lambda/8 modes are generated by the two radiating strips and occur at close frequencies at about 900 MHz to form a wide lower band to cover GSM850/900 operation. The two radiating strips also generate two higher-order modes or lambda/4 modes at about 1900 MHz to form a wide upper band for GSM1800/1900/UMTS operation. Penta-band WWAN operation is hence achieved, yet the proposed PIFA only occupies a small printed area of 15times31 mm2 or 465 mm2 on the system circuit board of the mobile phone, which is about the smallest for the internal uniplanar printed antenna capable of penta-band operation that have been reported. Details of the proposed PIFA are presented. The specific absorption rate (SAR) and hearing aid compatibility (HAC) results for the proposed PIFA are also analyzed.

173 citations


Cites background from "Planar Antennas for Wireless Commun..."

  • ...Dipole-like radiation patterns for both the two frequencies are seen, which are similar to those observed for the conventional internal mobile phone antennas in the 900 MHz band [1]....

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  • ...tional internal mobile phone antennas in the 1800 MHz band [1]....

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