Showing papers in "Microwave and Optical Technology Letters in 2006"
TL;DR: In this article, a simple closed-form equation to calculate the envelope correlation between any two receiver or transmitter antennas in a multi-input multi-output (MIMO) system of an arbitrary number of elements is derived.
Abstract: A simple closed-form equation to calculate the envelope correlation between any two receiver or transmitter antennas in a multi-input multi-output (MIMO) system of an arbitrary number of elements is derived. The equation uses the scattering parameters obtained at the antenna feed point to calculate the envelope correlation coefficient. This approach has the advantage that it does not require knowledge of the antenna radiation pattern. Numerical data that include conductor and permittivity loss are shown to validate the approach. Using the scattering parameters for calculating the envelope correlation is less laborious and relatively cheaper, as compared to the radiation pattern approach. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 832–834, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21490
164 citations
TL;DR: In this article, the authors presented the design of a resonant microwave absorber made by a proper array of split ring resonators (SRRs), and the physical mechanism behind the operation of the proposed component is based on the SRR resonance, arising when the structure is excited by a properly polarized impinging wave.
Abstract: In this letter, the authors present the design of a resonant microwave absorber made by a proper array of split ring resonators (SRRs). The physical mechanism behind the operation of the proposed component is based on the SRR resonance, arising when the structure is excited by a properly polarized impinging wave. A resistive sheet, located nearby the resonating SRRs, absorbs the electromagnetic energy of the incoming field, without destroying the resonance condition of the SRRs. The two relevant features of the proposed absorber are its electrical thickness, which is very small compared with the operating wavelength, and the lack of a metallic backing, which represent a common part of conventional absorber layouts. The full-wave simulations presented in the paper confirm the effectiveness of the proposed absorber for microwave applications. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2171–2175, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21891
125 citations
TL;DR: In this paper, the hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) algorithm for a two-dimensional TE wave is extended to a full three-dimensional (3D) wave.
Abstract: In this paper, the hybrid implicit–explicit finite-difference time-domain (HIE-FDTD) algorithm for a two-dimensional (2D) TE wave is extended to a full three-dimensional (3D) wave. The weakly conditional stability is verified by numerical simulation results. Numerical formulations of the 3D HIE-FDTD method are presented and simulation results are compared to those using the conventional 3D finite-difference time-domain method. High computation efficiency is obtained by introducing an unequal space increment in different dimensions in the HIE-FDTD method. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2291–2294, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21898
117 citations
TL;DR: A domain decomposition scheme based on the equivalence theorem and the method of moments is introduced, where the unknowns on every subscatterer are transferred to theunknowns on its surrounding equivalent surface.
Abstract: A domain decomposition scheme based on the equivalence theorem and the method of moments is introduced. The unknowns on every subscatterer are transferred to the unknowns on its surrounding equivalent surface. With this scheme, both the number of unknowns and the memory usage are reduced. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1853–1857, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21777
96 citations
TL;DR: In this article, a planar ultra-wideband ring monopole antenna with a band-notch feature is presented, which is achieved by embedding a quarter-wavelength tuning stub in the circular ring.
Abstract: A compact planar ultra-wideband ring monopole antenna with a band-notch feature is presented. The band-notch characteristic is achieved by embedding a quarter-wavelength tuning stub in the circular ring monopole. The notched band is controllable by adjusting the length of the tuning stub. The measured antenna radiation patterns show good omnidirectional performance across the operation bandwidth. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 125–126, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21283
96 citations
TL;DR: Fondevila et al. as discussed by the authors applied time modulation in the synthesis of sum and difference patterns by using linear arrays, which has been published in final form at DOI 10.1002/mop.21489.
Abstract: "This is the peer reviewed version of the following article: Fondevila, J.; Bregains, Julio Claudio; Ares Pena, F. J.; Moreno Piquero, E. "Application of time modulation in the synthesis of sum and difference patterns by using linear arrays", Microwave and Optical Technology Letters, 829–832 Volume: 48, Issue: 5, May. 2006, which has been published in final form at DOI 10.1002/mop.21489. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."
92 citations
TL;DR: In this paper, a reflectarray antenna composed of double square rings of variable lengths printed on a conductor-backed substrate is proposed for reflectarray-bandwidth enhancement, which demonstrates a radiation efficiency close to 52% and 1-dB gain bandwidth of 9, centered at 22 GHz.
Abstract: A reflectarray antenna composed of double square rings of variable lengths printed on a conductor-backed substrate is proposed for reflectarray-bandwidth enhancement. Using this technique, a single-layer reflectarray of a wider bandwidth compared to conventional single-layer reflectarrays is designed, fabricated, and measured. The measured results demonstrate a radiation efficiency close to 52% and 1-dB gain bandwidth of 9%, centered at 22 GHz. © 2006 Government of Canada. Exclusive worldwide publication rights in the article have been transferred to Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1317–1320, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21630
85 citations
TL;DR: In this paper, the authors describe a self-complementary square-spiral antenna on a GaAs substrate with a broadside high-directivity (∼29 dB) frequency-independent pattern when coupled through a silicon hyperhemisphere.
Abstract: This paper describes a compact, self-complementary square-spiral antenna on a GaAs substrate with a broadside high-directivity (∼29 dB) frequency-independent pattern when coupled through a silicon hyperhemisphere. The driving-point resistance undulates between ∼100 and 300Ω from 200 GHz to 1 THz—much higher than the 72Ω value from Booker's modified formula, but quite beneficial for coupling to high-impedance broadband devices. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 524–529, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21398
78 citations
TL;DR: In this paper, a planar tapered slot antenna for use in a circular cylindrical microwave imaging system is pre-sented, assuming high dielectric substrate material Rogers RT6010LM to achieve its compact size.
Abstract: The design of an ultra-wideband planar tapered slot antenna for use in a circular cylindrical microwave imaging system is pre-sented. The antenna was designed assuming high dielectric substrate material Rogers RT6010LM to achieve its compact size. The developed antenna element (50 X 50 mm(2)) features a 10-dB return loss bandwidth from 2.75 GHz to more than 11 GHz. The gain of the antenna is between 3.5 and 9.4 dBi over the 3-10 GHz band. The experimental tests showed that the manufactured antenna element supports transmission of narrow pulses with negligible distortions, as required in the microwave imaging system. (c) 2006 Wiley Periodicals, Inc.
73 citations
TL;DR: In this paper, the enhancement of directivity of a monopole located in a Fabry-Perot type cavity is studied based on the response of the cavity excited from its inside by electromagnetic waves.
Abstract: The enhancement of directivity of a monopole located in a Fabry-Perot type cavity is studied. The analysis is based on the response of the cavity excited from its inside by electromagnetic waves. To validate the proposed antenna, an experimental prototype is designed, fabricated, and measured.
72 citations
TL;DR: The design of planar multilayer coatings with high absorption for a desired range of frequencies and angles is presented and numerical results show the advantages and the applicability of this design method.
Abstract: The design of planar multilayer coatings with high absorption for a desired range of frequencies and angles is presented. The design technique is based on multiobjective particle swarm optimization (MOPSO). Particle swarm optimization (PSO) is an evolutionary optimization algorithm based on bird flight. Multiobjective PSO (MOPSO) is a Pareto PSO algorithm which produces the Pareto front fast and efficiently. MOPSO is used for several design cases and is compared with multiobjective genetic algorithms. Numerical results that are also compared with those existing in the literature show the advantages of this approach and the applicability of this design method. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1553–1558, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21727
TL;DR: In this article, two kinds of optimization designs are proposed for enhancing the gain and reducing the backward radiation of printed antenna based on a systematic comparison study, and the validation of the simulated and experimental results confirms that the expected performance is met.
Abstract: Fabry–Perot resonators with EBG or FSS cover are introduced to enhance the gain of printed antenna. Based on a systematic comparison study, two kinds of optimization designs are proposed for enhancing the gain and reducing the backward radiation. The validation of the simulated and experimental results confirms that the expected performance is met. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1272–1274, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21674
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
TL;DR: In this paper, a UWB circular disc monopole antenna with a band-notch function is introduced and an arched slot is inserted on the disc to obtain the band notch function and its parameters are studied in detail.
Abstract: A UWB circular disc monopole antenna fed by a coplanar waveguide (CPW) is introduced with a band-notch function. An arched slot is inserted on the disc to obtain the band-notch function and its parameters are studied in detail. It is shown that the band-notched function can be controlled by the location of the arched slot and the notched band can be changed by adjusting the length and width of the slot. Experimental results show that the ultra-wideband (UWB) antenna has an obvious rejected band in the WLAN frequencies. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1667–1670, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21710
TL;DR: In this article, a composite medium consisting of two sublattices of dielectric spherical particles of high permittivity and different radii embedded in a matrix of smaller permittivities is considered.
Abstract: A composite medium consisting of two sublattices of dielectric spherical particles of high permittivity and different radii embedded in a dielectric matrix of smaller permittivity are considered. It has been shown that such a composite medium reveals properties of an isotropic double negative media in the frequency range where resonance oscillations of H111 mode in one kind of particles and E111 mode in another kind of particles are excited simultaneously. The E111 resonance and the H111 resonance give rise to the magnetic dipole momentum and the electric dipole momentum correspondingly. Averaging the magnetic momentum and the electric momentum over the cells belonging to the appropriate spherical particles reveals the negative permittivity and permeability. Distribution of the electromagnetic wave outside the sphere was calculated. Influence of dispersion of the sphere permittivity and size on the effective parameters was estimated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2553–2556, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22002
TL;DR: In this article, an internal shorted dipole antenna for digital television (DTV) signal reception in the 470-806-MHz band is presented, which comprises an internal matching circuit, which includes a chip capacitor and two narrow metal strips.
Abstract: By using the upper and lower ground planes of a folder-type mobile phone, a novel internal shorted dipole antenna for digital television (DTV) signal reception in the 470–806-MHz band is presented. The shorted dipole antenna further comprises an internal matching circuit, which includes a chip capacitor and two narrow metal strips, for achieving improved impedance matching over the DTV band of 470–806 MHz. The proposed DTV antenna was constructed and studied. The measured return loss for the operating frequencies over the DTV band is better than 2.5:1 VSWR. In addition, good radiation characteristics are also obtained. Design considerations of the proposed internal DTV antenna are described. A parametric study of the internal matching circuit on the impedance matching of the antenna is also presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1015–1019, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21587
TL;DR: It is shown that the second-orderPML is overall the best choice for a general problem, since the regular PML is incapable of absorbing evanescent waves and the CFS-PML is ineffective for the absorption of low-frequency propagating waves.
Abstract: The performance of regular, complex frequency shifted (CFS), and second-order perfectly matched layers (PMLs) is studied for the numerical simulation of waveguide problems. The limitations of each PML is clearly demonstrated. It is shown that the second-order PML is overall the best choice for a general problem, since the regular PML is incapable of absorbing evanescent waves and the CFS-PML is ineffective for the absorption of low-frequency propagating waves. Both two- and three-dimensional problems are considered to confirm the analysis. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2121–2126, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21872
TL;DR: In this paper, two different shaped (meandered and spiral) antennas were designed using finite-difference time-domain (FDTD) simulations and measurement results, and installed on an implantable medical device in a biological-tissue simulating model.
Abstract: Based on a planar inverted-F antenna (PIFA) configuration, two different shaped (meandered and spiral) antennas are designed using finite-difference time-domain (FDTD) simulations and measurement results. The antennas are installed on an implantable medical device in a biological-tissue simulating model. The impedance-matching and radiation characteristics of two PIFAs are compared in order to observe which shape is more appropriate for wireless communication links of implantable medical devices. Additionally, the effects of the human skin's thickness on the antennas are studied in order to consider medical devices which are implanted in various subcutaneous tissues. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 567–572, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21409
TL;DR: In this paper, the authors investigated the dielectric re-laxation (cut off) frequency as a function of silicon substrate resistiv-ity and calculated the conditions of substrate noise isolation and RF passive device design.
Abstract: In the design of high-speed and high frequency IC’s,the influence of the substrate on the circuit performance must beconsidered carefully. This work investigates the loss characteristic ofsilicon substrate with different resistivities and distinguishes theoreti-cally and experimentally the dielectric losses into the intrinsic loss ofsilicon (tan D ) and the extrinsic substrate leakage loss (tan L )caused by the finite conductivity of the substrate. The dielectric re-laxation (cut off) frequency as a function of silicon substrate resistiv-ity are calculated as considering the conditions of substrate noiseisolation and RF passive device design. © 2006 Wiley Periodicals, Inc.Microwave Opt Technol Lett 48: 1773–1776, 2006; Published online inWiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21786 Key words: conductivity; dielectric loss; intrinsic loss; extrinsic loss;tan L 1. INTRODUCTION There is a steady increase in the demand for high-density, low-cost, compact RF front ends, and microwave monolithic integratedcircuits (MMICs) [1] for wireless and portable communication.The integration of a large number of passive components includingthe individual passive devices of transmission lines, inductors,capacitors, or functional passive devices of filters and antennaswith low loss and minimal crosstalk is as important as the ad-vancement in active transistor technology [2]. However, the low-resistivity substrate used in standard CMOS processing for mostMMICs has limited the integration of high-quality passive com-ponents. There has been a large amount of research, both inindustry and in academia, to overcome the high attenuation of thepassive components on lossy silicon substrate to develop high-quality microwave circuits and modules [2–5]. High resistivitysilicon (HRS) has been proven as a solution for reducing thesubstrate leakage loss and suppressing substrate noise of the pas-sives, and HRS substrates can be realized by MeV proton implan-
TL;DR: In this paper, a rectangular ring is introduced in an open-ended planar monopole antenna fed by a coplanar waveguide (CPW) in order to achieve broadband dual-frequency operation.
Abstract: A rectangular ring is introduced in an open-ended planar monopole antenna fed by a coplanar waveguide (CPW) in order to achieve broadband dual-frequency operation. Prototypes of the proposed antenna designed for WLAN operation in the 2.4- and 5.2-GHz bands are constructed and tested. The maximum measured bandwidth is measured approximately 14.48% and 11.49% (VSWR 1:2), respectively. Good radiation-pattern characteristics of monopolelike patterns have been obtained. The obtained measured gain is measured to be 1.98 dBi at 2.44 GHz and 11.0 dBi at 5.2 GHz, respectively. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1480–1483, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21736
TL;DR: In this article, a design procedure for designing a compact UWB antipodal Vivaldi antenna is presented, which operates over the UWB frequency band from 3.1 to more than 10.6 GHz.
Abstract: In this paper, a novel design procedure for designing a compact UWB antipodal Vivaldi antenna is presented. The antenna operates over the UWB frequency band from 3.1 to more than 10.6 GHz. Its measured far-field radiation is directive and its peak gain is 10.2 dBi in the specified band. The antenna pulse response shows negligible distortion, indicating that it can be useful in a precision ranging and imaging instrumentation.
TL;DR: In this article, a multiple input multiple output (MIMO) system using three EMC (electromagnetic compatible) chip antennas in a personal digital assistant (PDA) phone is demonstrated.
Abstract: A multiple input multiple output (MIMO) system using three EMC (electromagnetic compatible) chip antennas in a personal digital assistant (PDA) phone is demonstrated. The three EMC chip antennas are mounted at three corners of the system ground plane of the PDA phone and all generate a wide bandwidth covering the wireless local area network (WLAN) operation in the 2.4-GHz band (2400–2484 MHz). By adding a T-shaped shorted strip in the proposed MIMO antenna system, large improvements in the isolation (S12, S13, and S23 all less than −20 dB) between any two antennas of the MIMO system are achieved. Detailed effects of the T-shaped shorted strip on the isolation improvement in the proposed MIMO antenna system are analyzed. Radiation characteristics of the three antennas are also studied. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1238–1242, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21665
TL;DR: An accurate and computationally implicit 3D finite-difference time-domain (FDTD) method based on the unconditionally stable Crank–Nicolson scheme (3D CN-FDTD), with time steps greatly more than the Courant–Friedrich–Levy (CFL) limit and the traditional Yee FDTD method.
Abstract: In this paper, an accurate and computationally implicit 3D finite-difference time-domain (FDTD) method based on the unconditionally stable Crank–Nicolson scheme (3D CN-FDTD) is presented. The source excitation in 3D CN-FDTD is described and the numerical simulation of the 3D CN-FDTD method is demonstrated through numerical examples. The results of this method, the ADI-FDTD method, and traditional FDTD schemes are compared. A good agreement is obtained for the 3D CN-FDTD method with time steps greatly more than the Courant–Friedrich–Levy (CFL) limit and the traditional Yee FDTD method. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1619–1622, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21684
TL;DR: In this paper, a planar monopole antenna suitable for broadband wire-less communication is designed and developed with the use of a trun-cated ground plane, and the proposed printed monopole antennas offers
Abstract: A planar monopole antenna suitable for broadband wire- less communication is designed and developed. With the use of a trun- cated ground plane, the proposed printed monopole antenna offers
TL;DR: In this article, a printed ultra wideband (UWB, 3.1-10.6 GHz) quasi-dipole antenna with the band-notched characteristic is presented.
Abstract: A printed ultra-wideband (UWB, 3.1–10.6 GHz) quasi-dipole antenna with the band-notched characteristic is presented. The antenna mainly comprises two radiating elements: an upper semi-circular disk and a lower semi-circular disk embedded with a pair of narrow slits, whose length is about one quarter-wavelength at the desired notched frequency. Both the upper and lower semi-circular disks are of the same dimensions, thus making the proposed antenna tend to be a dipole structure. With a compact size of 25 × 25 mm2, the proposed antenna showing UWB operation with a notched frequency band at 5 GHz is demonstrated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 418–420, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21368
TL;DR: In this article, multiband printed dipole antennas using parasitic elements are proposed for multiple wireless services, which can be easily fed using a 50Ω probe or directly integrated in the PC board with a microstrip line.
Abstract: In this paper, multiband printed dipole antennas using parasitic elements are proposed for multiple wireless services First, an elementary dipole antenna is studied and characterized at the operating frequency of 29 GHz Next, two compact dual-band planar-antenna configurations are presented The first antenna is suitable for nautical RADAR detection in both the L- and X-bands, whereas the second is suitable for Bluetooth and WiFi or WiMax applications Finally, a triple-band printed dipole antenna with two parasitic elements is designed to operate at triple-band for IMT-2000, 5-GHz WLAN, and X-band ISM, respectively Prototypes of the proposed antennas are constructed and tested All the antennas have a simple geometry and can be easily fed using a 50Ω coaxial probe or directly integrated in the PC board with a microstrip line Details of the experimental and simulation results are presented and discussed © 2006 Wiley Periodicals, Inc Microwave Opt Technol Lett 48: 1639–1645, 2006; Published online in Wiley InterScience (wwwintersciencewileycom) DOI 101002/mop21714
TL;DR: In this article, a novel all-fiber edge filter for optical wavelength measurement application is proposed, which sandwiches a multimode fiber (MMF) section with an optimally designed length between two single-mode fibers and utilizes the multimode interference in the MMF section.
Abstract: A novel all-fiber edge filter for optical wavelength measurement application is proposed. The filter sandwiches a multimode fiber (MMF) section with an optimally designed length between two single-mode fibers and utilizes the multimode interference in the MMF section. A measurable wavelength range of more than 50 nm is obtained with a desired spectral location through optimally choosing the length of the MMF section. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 900–902, 2006; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21512
TL;DR: In this article, an ultra wideband (UWB) low-noise amplifier (LNA) that consists of two cascode and shunt feedback stages is presented, and the measurement results show the maximum gain (S21) of 11.9 dB with the 3-dB band from 2 to 6.5 GHz and return losses (S11, S22) of less than −7.8 dB from 2-11 GHz.
Abstract: An ultra-wideband (UWB) low-noise amplifier (LNA) that consists of two cascode and shunt feedback stages is presented. The measurement results show the maximum gain (S21) of 11.9 dB with the 3-dB band from 2 to 6.5 GHz and return losses (S11, S22) of less than −7.8 dB from 2 to 11 GHz. In addition, the fabricated LNA achieves the average noise figure (NF) of 4.5 dB from 2 to 10 GHz, which value is much lower than previously reported state-of-the-art UWB amplifiers. The input-referred 3rd-order intercept point (IIP3) and the input-referred 1-dB compression point (P1dB) of the LNA are achieved as 4 and −5 dBm, respectively, while consuming 27 mW in the 0.18-μm RF CMOS process. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1102–1104, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21611
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: In this paper, the resonant behavior of a printed circuit board (PCB) is analyzed by means of the Theory of Characteristic Modes (TCM), and the information obtained is utilized to design a wideband antenna suitable for mobile terminals.
Abstract: The resonant behavior of a handset printed circuit board (PCB) is analyzed by means of the Theory of Characteristic Modes (TCM). The information obtained is utilized to design a wideband antenna suitable for mobile terminals. To feed this resonant structure, a planar square plate is used. This antenna exhibits an excellent wideband performance and omnidirectional radiation patterns. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1408–1411, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21654