Design of a Multiband Antenna for Mobile Handset Operations
TL;DR: A comparison with that of the existing antennas showed that wide impedance bandwidth of the proposed structure can be achieved without increasing the implementation complexity.
Abstract: A compact internal antenna is proposed for GSM/GPS/DCS/PCS/UMTS/Bluetooth/WLAN/WiFi/WiMAX applications. The proposed antenna is comprised of a loop antenna and a monopole antenna. The antenna system shows wide multi-operation band as well as good radiation patterns and small volume. The antenna can be printed on the system circuit board of the mobile phone and short-circuited to the system ground plane to form a loop-type structure. A comparison with that of the existing antennas showed that wide impedance bandwidth of the proposed structure can be achieved without increasing the implementation complexity.
Citations
More filters
TL;DR: A description of the evolution of wireless handheld devices, regulations, challenges in today’s smartphones, and handset characterization is reviewed and recent advances in antenna technology for wireless handheld or portable devices are presented.
Abstract: The constant evolution of wireless handheld devices together with the apparition of multiple wireless communication systems fosters the antenna community to design new radiating and measurements systems capable of satisfying the market demands. It is an object of the present paper to provide an overview of the evolution that wireless handheld technology has experienced in the last years. In this sense, a description of the evolution of wireless handheld devices, regulations, challenges in today’s smartphones, and handset characterization is reviewed. Finally, recent advances in antenna technology for wireless handheld or portable devices are presented.
140 citations
Cites background from "Design of a Multiband Antenna for M..."
...Many designs have appeared in the literature and industry with the aim of covering the largest number of frequency bands as possible without reducing the antenna performance [44–50]....
[...]
03 Apr 2012
TL;DR: The four key technologies related to small antenna designs to be reviewed and discussed, including multiband planar inverted-F antennas, broadband folded patch antenna, compact differentially fed antennas, and miniature circularly polarized patch antennas, would cover a wide range of topical interests and practical applications.
Abstract: The objective of this paper is to provide the context, physical insight, and perspective on antennas in wireless communications. Although it does not mean to be comprehensive, the four key technologies related to small antenna designs to be reviewed and discussed, including multiband planar inverted-F antennas, broadband folded patch antennas, compact differentially fed antennas, and miniature circularly polarized patch antennas, would cover a wide range of topical interests and practical applications. A brief overview of computer software for analyzing these antennas is also provided. Hopefully, this paper will be beneficial for the diverse engineering readership of the IEEE.
133 citations
TL;DR: A set of external tuning circuits were designed to demonstrate the potential of the proposed configuration for applications where some level of reconfigurability is required and to improve the isolation between the wideband and narrowband ports several modified arrangements were presented and investigated.
Abstract: An integration concept for multi-standard antennas is described. This technique is based on utilizing a relatively large antenna that is printed on the top side of a substrate, acting as a ground for a smaller antenna. The smaller antenna is printed onto the bottom side of the substrate. To validate this concept, an integrated wide-narrowband demonstrator antenna is presented. This antenna is composed of a shorted microstrip patch integrated with a coplanar waveguide (CPW) fed ultrawideband (UWB) antenna. A prototype of the integrated antenna was fabricated and its performance was verified. This arrangement is a promising candidate for applications where some level of reconfigurability is required. For this reason, a set of external tuning circuits were designed to demonstrate the potential of the proposed configuration for such applications. In order to improve the isolation between the wideband and narrowband ports several modified arrangements were presented and investigated.
117 citations
Cites background from "Design of a Multiband Antenna for M..."
...Today, a typical wireless device might support multiple services such as GSM, DVB-H, and GPS that all rely on a multi-band antenna [1]–[9]....
[...]
TL;DR: In this paper, a small-size coupled-fed loop antenna suitable to be printed on the system circuit board of the mobile phone for penta-band WWAN operation (824-960/1710-2170 MHz) is presented.
Abstract: A small-size coupled-fed loop antenna suitable to be printed on the system circuit board of the mobile phone for penta-band WWAN operation (824-960/1710-2170 MHz) is presented. The loop antenna requires only a small footprint of 15 x 25 mm2 on the circuit board, and it can also be in close proximity to the surrounding ground plane printed on the circuit board. That is, very small or no isolation distance is required between the antenna's radiating portion and the nearby ground plane. This can lead to compact integration of the internal on-board printed antenna on the circuit board of the mobile phone, especially the slim mobile phone. The loop antenna also shows a simple structure; it is formed by a loop strip of about 87 mm with its end terminal short-circuited to the ground plane and its front section capacitively coupled to a feeding strip which is also an efficient radiator to contribute a resonant mode for the antenna's upper band to cover the GSM1800/1900/UMTS bands (1710-2170 MHz). Through the coupling excitation, the antenna can also generate a 0.25-wavelength loop resonant mode to form the antenna's lower band to cover the GSM850/900 bands (824-960 MHz). Details of the proposed antenna are presented. The SAR results for the antenna with the presence of the head and hand phantoms are also studied.
112 citations
TL;DR: A promising standard solution for a radiating system capable to operate in the main communication standards GSM850, GSM900, DCS, PCS and UMTS is provided with a volume reduction factor around 20.
Abstract: The increasing demand for multifunctional wireless devices has fostered the need to reduce the space devoted to the antenna in order to favor the integration of multiple and new functionalities. This fact becomes a challenge for the handset antenna designers who have to develop antennas capable of providing multi-band operation constrained by physical limitations. This proposal consists in a radiating system capable of providing multi-band operation without the need of an antenna element, by properly exciting the efficient radiation modes associated to the ground plane structure. In this sense, the typical volume devoted to a handset antenna is reduced by a factor of 20. The electrical model approximation of the radiating structure leads to the radiofrequency system design able to provide multi-band operation. The feasibility of the proposal has been tested by electromagnetic simulations as well as by experimental measurements regarding the main antenna parameters: reflection coefficient, efficiency, and radiation patterns. Furthermore, the human head interaction concerning biological compatibility in terms of SAR (Specific absorption rate) has been measured and a solution for its reduction is presented. As a result, a promising standard solution for a radiating system capable to operate in the main communication standards GSM850, GSM900, DCS, PCS and UMTS is provided with a volume reduction factor around 20.
97 citations
References
More filters
TL;DR: In this paper, a promising printed loop antenna is described that can be mounted in perpendicular to the top edge of the system circuit board of the mobile phone for penta-band operation.
Abstract: A promising printed loop antenna is described that can be mounted in perpendicular to the top edge of the system circuit board of the mobile phone for penta-band operation. The antenna comprises a loop pattern printed on a thin FR4 substrate of small size 10 X 60 mm2 and a perpendicular feeding portion printed on the narrow top ungrounded region of the system circuit board. Since the top ungrounded region is 4 mm in length only, the antenna is very low profile to the top edge of the ground plane on the system circuit board; that is, the antenna occupies a small volume inside the mobile phone housing and is suitable to operate as an internal antenna. In addition, the antenna generates two wide operating bands centered at about 900 and 1900 MHz to cover GSM850/900 and DCS/PCS/UMTS operations, respectively.
101 citations
"Design of a Multiband Antenna for M..." refers background in this paper
...It has been demonstrated that a loop antenna can be promising for achieving dual-band or multiband operations in the mobile phone [5], [6]....
[...]
TL;DR: A new built-in quad-band handset antenna for covering GSM900, DCS1800, PCS1900, and UMTS2000 bands is presented and the simulation is based on the finite-difference time-domain (FDTD) method.
Abstract: A new built-in quad-band handset antenna for covering GSM900, DCS1800, PCS1900, and UMTS2000 bands is presented. Details of the antenna are discussed along with measured and simulated results. The simulation is based on the finite-difference time-domain (FDTD) method.
87 citations
"Design of a Multiband Antenna for M..." refers background in this paper
...M ODERN mobile handsets are often required to operate at multiple frequency bands to facilitate the application for various communication needs [1]–[3]....
[...]
TL;DR: In this article, a compact internal quad-band handset antenna for covering GSM900, DCS1800, PCS1900, and ISM2450 bands is presented, along with measured and simulated results.
Abstract: A novel compact internal quad-band handset antenna for covering GSM900, DCS1800, PCS1900, and ISM2450 bands is presented. Details of the antenna are discussed along with measured and simulated results. The simulation is based on the FDTD method. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 217–223, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11019
86 citations
TL;DR: In this article, a compact internal quad-band handset antenna for covering the GSM900, DCS1800, PCS1900, and ISM2450 bands is presented.
Abstract: A novel compact internal quad-band handset antenna for covering the GSM900, DCS1800, PCS1900, and ISM2450 bands is presented. The proposed antenna consists of folded patches sharing a common shorting strip and occupies a total volume of 36/spl times/16/spl times/9 mm/sup 3/. Details of the antenna are discussed along with measured and simulation results. The simulation is based on the finite-difference time-domain method.
80 citations
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
46 citations
"Design of a Multiband Antenna for M..." refers background or methods in this paper
...Various techniques have been utilized in the design to satisfy multiband requirement [3]....
[...]
...M ODERN mobile handsets are often required to operate at multiple frequency bands to facilitate the application for various communication needs [1]–[3]....
[...]