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Anti-counterfeiting, Security, Identification, 2007 IEEE International Workshop on

Date 16-18 April 2007

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Displaying Results 1 - 25 of 106
  • Some Novel Designs for RFID Antennas and their Performance Enhancement with Metamaterials

    Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (141 KB) |  | HTML iconHTML  

    In this presentation we will present the results of research on a number of UHF/RFID tag configurations, for which we have carried out extensive parametric studies. One of our objectives has been to examine tag designs that are less sensitive to their environment, in that their radiation patterns and impedance characteristics change little when placed on different types of platforms, e.g., metal, glass or cardboard. The paper will also explore tag designs that employ Electromagnetic Bandgap (EBG) surfaces as substrates to improve their performance. Results of computer simulation and experimental studies of some representative tag designs will be included in the paper. Some of the tag antenna designs to be discussed are presented. The integration of an RFID tag with an EBG screen is also shown. View full abstract»

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  • Metamaterial-Inspired Efficient Electrically-Small Antennas: Designs and Experiments

    Page(s): 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (40 KB) |  | HTML iconHTML  

    An electrically small electric dipole antenna is known to be a very inefficient radiator, i.e., because it has a very small radiation resistance while simultaneously having a very large capacitive reactance, a large impedance mismatch to any realistic power source exists. It has been demonstrated recently that enclosing an electrically small electric (magnetic) dipole antenna in an electrically small epsilon-negative (ENG) (mu- negative (MNG)) shell leads to an efficient electrically small radiator. The inductive (capacitive) nature of the ENG (MNG) shell compensates for the capacitive (inductive) nature of the electrically small electric (magnetic) dipole antenna, i.e., it functions as a distributed matching element that forms this "geometrically" resonant system. More realistic electrically small center-fed electric dipole-ENG spherical shell and coax-fed electric monopole-ENG hemispherical shell antenna systems have also been modeled numerically using ANSOFT's High Frequency Structure Simulator (HFSS) and COMSOL's Multiphysics simulator. The input resistance and reactance of these realistic antenna-ENG shell systems have been obtained from these numerical models. It has been shown that these systems could be designed to have geometrical resonances for which the relative gains were analogous to the radiated power ratios obtained with the analytical models. With further tuning, it has also been shown that an "antenna" resonance, where the system has a zero input reactance and an input resistance which is matched to a specified source resistance, can also be realized to yield a very high overall efficiency. The effects of losses and frequency dispersion on these systems have been studied. With dispersion engineering available from the use of active metamaterials, the large bandwidths obtained with the dispersionless metamaterial models can again be obtained even in the presence of losses and dispersion. This suggests the possible realization of metamaterial-based - - broad bandwidth efficient electrically-small antennas. View full abstract»

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  • Slow Wave Structures for Miniature Antennas

    Page(s): 5 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (968 KB) |  | HTML iconHTML  

    Engineered materials, such as new composites, electromagnetic bandgap, and periodic structures have attracted considerable interest in recent years due to their remarkable and unique electromagnetic properties. Among this class of media are the magnetic photonic (MPC) and degenerate band edge (DBE) crystals. These periodic media have the concurrent characteristics of wave slow down and impedance matching at their dielectric interface. The first allows for miniaturization, and the latter is equivalent to radiation efficiency. Overall these properties are a consequence of the anisotropic nature of the periodic media, allowing for internal phase shifting that leads to ray collimation for best aperture utilization. To a degree, they emulate zero index materials, and thus (planar) layers of the material serve the same purpose as a reflector dish. This important property of the MPC and DBE structures will be discussed at the meeting. The main focus of this work is two-fold: 1. The realization (in terms of material availability and fabrication) of the proposed periodic media, and their theoretical and measured performance for antenna applications. Specifically, we will pursue feed arrangements, impedance matching and metallizations/printings for maximum aperture efficiency. 2. Introduction of a concept that allows for emulation of the anisotropic properties of MPC/DBE media using a novel coupled line printed approach. This concept allows for the realization of the wave slow-down and impedance matching within a printed microwave structure, leading to new design methodologies for microwave components, including couplers, filters and printed antenna devices. View full abstract»

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  • Re-configurable Antennas

    Page(s): 9 - 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (475 KB) |  | HTML iconHTML  

    Reconfigurability in an antenna system is a desired characteristic that has been the focus of much research in recent years. Reconfigurable antennas, with the ability to radiate more than one pattern, at different frequencies, and with various polarizations offer several degrees of freedom to antenna designers. In this paper, several reconfigurable antenna architectures with and without MEMS switches are presented and discussed. The different issues encountered during the design of the overall antenna design are described herein. View full abstract»

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  • Design Considerations for Millimeter Wave Antennas within a Chip Package

    Page(s): 13 - 17
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (618 KB) |  | HTML iconHTML  

    Millimeter wave (mmWave) antennas designed for package integration are significantly more challenging than antenna designs for frequencies below 10 GHz. In addition to wide impedance bandwidth, high efficiency and small size, one has to consider material selection, manufacturing precision, antenna feed line and connections, and electromagnetic interference to the active RF circuits nearby. View full abstract»

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  • Frequency Reconfigurable Antenna with Micromechanical Patch

    Page(s): 18 - 22
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (360 KB) |  | HTML iconHTML  

    The frequency reconfigurable antenna normally designed with MEMS switch is flexible to change its operating frequency. However, when the operating frequency is up to millimeter wave or even higher, this kind MEMS switching operation will deteriorate performance of antenna. A novel frequency reconfigurable antenna is designed with micromechanical patch moving via electrostatic force. As the bias voltage between patch and antenna is changed, it makes the patch to move and the antenna operating frequency changes too. Its operating mode is equivalent to changing the relatively permittivity of antenna substrate. Architecture of this kind of micromechanical patch antenna is presented and its principle is analyzed. With the results of parameter analysis, the desire performance of antenna can be designed perfectly, and the simulation result is coincident with the prospective analysis. View full abstract»

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  • Wideband Printed and Double-Sided Dipole Four Elements Array Antenna on 5.2GHz UNII Band

    Page(s): 23 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (536 KB) |  | HTML iconHTML  

    The feature of printed and doubled-sided dipole pair wideband antennas in application of 5.2 GHz UNII band operated in WLAN access point has been demonstrated in this paper. The printed dipole array antenna consists of one dipole array arranged back to back and can be easily implemented by printing on both sides of a dielectric substrate and is suitable for integration with monolithic microwave integrated circuit (MMIC) module. Based on the matching technology, which includes of a 50 Omega microstrip feed line with quarter-wavelength transformer matched circuits is designed. Properties of the radiator as an array element have also been investigated. Simulator IE3D is used to verify our analysis. Both simulation and measured data are pretty matched. According to the measured results, the measured gain for 5.2 GHz band is between 3.8 and 5 dB and the bandwidth with VSWR less than 2 is about 400 MHz. View full abstract»

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  • A High-Speed High-Resolution Latch Comparator for Pipeline Analog-to-Digital Converters

    Page(s): 28 - 31
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (123 KB) |  | HTML iconHTML  

    A high-speed and high-resolution comparator intended to be implemented in a 12 bit 100 MHz pipeline analog-to-digital converter (ADC) for frequency wireless local area network application is proposed. The designed comparator presents a rail-to-rail input range preamplifier without any capacitance required. This comparator with a novel architecture of output stage achieves very high speed at a low kickback noise. The simulation results using a 0.35 mum TSMC CMOS process technology show that this comparator exhibits a propagation delay of 2.8 ns and has a very high resolution for a rail-to-rail input signal range, while consumes only 1.0 mW of power with 5.0 V voltage supply. View full abstract»

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  • The Application of PBG Configuration in Planar Spiral Antenna

    Page(s): 32 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (187 KB) |  | HTML iconHTML  

    For the requirement of 3G mobile terminal at present, we have designed a new kind of WCDMA mobile terminal spiral antenna with PBG structure, which is capable of working in 1920-2170 MHz frequency broad band. Applying PBG configuration in planar spiral antenna, the characteristics is improved significantly and the size is also reduced. It makes the band width reach 250 MHz, which covers the whole emitting and receiving frequency band of WCDMA system. This antenna has been simulated and designed by using simulation design software, and the experiment results are agree well with the simulation results, which show that the varied period configuration of PBG is more benefit to improve antenna performance. View full abstract»

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  • Side Wall Coupling Via-Hole Array Cavity Band-Pass Filter

    Page(s): 36 - 39
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB) |  | HTML iconHTML  

    In this paper, we present a substrate integrated waveguide-based band-pass filter with wide stop-band rejection property. This band-pass filter is made up of two substrate integrated waveguide cavities, which couple to each other by an aperture on their common waveguide side wall. We employed the rigorous mode-matching method to analyze the electromagnetic boundary-value problem of the structure containing multiple discontinuities. In comparison with the conventional end-to-end coupled cavity filters, we found that our new side-wall-coupled cavity filter can suppress the second resonance frequency and, therefore, provide a considerably wide rejection band. It is interesting to note that the suppression of the second resonance frequency can be achieved by properly shifting the second cavity in lateral direction. View full abstract»

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  • Improvements of Microstrip Loop Filters

    Page(s): 40 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (207 KB) |  | HTML iconHTML  

    A miniaturized microstrip open-loop filter with dual-mode and defected ground structure is presented in this paper. The proposed filter has the characteristics of wide stopband, reduced size, and high selectivity. The combination of dual-mode and defected ground structure successfully eliminates the nearest two spurious harmonics. The simulated and experimental results show that the transmission coefficients are -30 and -25 dB at 2nd-and 3rd-harmonic frequencies. View full abstract»

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  • Spiral Antennas in RFID and Their Size Reduction and Performance Enhancement

    Page(s): 44 - 47
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (353 KB) |  | HTML iconHTML  

    This paper reviews the state of the art of the spiral antenna used in RFID, and discusses design approaches and techniques for its performance enhancement, size reduction, as well as compatibility with operating environments, by using techniques including the slow-wave antenna and the magneto-dielectric antenna. View full abstract»

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  • A Design of 3-dB Wiggly Line Coupler Using Micromachining Technology and Compared with 3-dB Lange Coupler

    Page(s): 48 - 51
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (273 KB) |  | HTML iconHTML  

    Traditionally, the design of 3 dB coupler on microstrip is usually accomplished by the well-known Lange coupler. This paper presents a design of a 3 dB Wiggly line coupler using micromachining technology. And a 3 dB Lange coupler using the same technology is fabricated for comparing. Compared with the Lange coupler, the Wiggly line coupler has the better directivity, larger power capacity and better gain flatness. However, the site of the Wiggly coupler is larger than that of the Lange couple, and the requirement of the technology of the Wiggly line coupler is higher than that of Lange coupler. View full abstract»

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  • Development and Implementation of Novel UHF Paper-Based RFID Designs for Anti-counterfeiting and Security Applications

    Page(s): 52 - 56
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (441 KB) |  | HTML iconHTML  

    In this paper, we proposed the development and implementation of novel paper-based UHF RFID designs for anti-counterfeiting and security. Miniaturization and global-band antenna configurations and utilization of inkjet printing techniques in/on organic substrates, such as paper, that will enable the low cost and large-scale implementation of RFID-enabled semi-autonomous sensors for "cognitive-intelligence" applications, are also discussed for a variety of security-related areas, featuring a great potential for low-cost large-scale solutions. View full abstract»

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  • Platform-tolerant Design for an RFID Tag Antenna

    Page(s): 57 - 60
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (108 KB) |  | HTML iconHTML  

    In this paper, the previous design of an inductively-coupled feed for an RFID tag antenna is modified to realize a platform-tolerant characteristic. In the new feed, parts of the feed line are connected directly to the radiating element to realize a platform-tolerant RFID tag antenna, which comprises a microstrip patch. Since there is a ground plane underneath the patch and the feedline, the performance of the tag is essentially independent of the surface upon which the tag is mounted. This desirable feature of the tag is confirmed by the measured results presented herein. View full abstract»

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  • Sneak Circuit Analysis in n-Stage Resonant Switched Capacitor Converters

    Page(s): 61 - 65
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (318 KB) |  | HTML iconHTML  

    Based on graph theory, this paper proposed a general method to analyze sneak circuit paths in n-stage resonant switched capacitor (RSC) converters. Firstly, the w-stage step-up RSC converter was simplified into the directed graph. Then all of the possible paths in the converter could be obtained by calculating the connection matrix. Based on the operating principle of RSC converter, the useless paths had been gotten rid of, and the effective ones were left. Comparing the effective paths with the normal operating condition, sneak circuit paths could be found out. At last, the proposed sneak circuit analysis method has been verified in a 3-stage step-up RSC converter. View full abstract»

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  • Modeling of MOSFETs for CMOS RF-IC Design

    Page(s): 66 - 69
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (209 KB) |  | HTML iconHTML  

    High-frequency (HF) modeling of MOSFETs for radio-frequency (RF) integrated circuit (IC) design is discussed. Modeling of the quasi-static (QS) and non-quasi-static (NQS) effect is discussed. Through the simulation results of the QS and NQS model with the comparison to the measured data, it is proved that the inclusion of the NQS effect would be a desirable feature for a RF model. View full abstract»

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  • A Low Voltage High Frequency Programmable Gm-C Bandpass Filter

    Page(s): 70 - 74
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (213 KB) |  | HTML iconHTML  

    A low voltage high frequency CMOS continuous time band-pass filter with programmable center frequency and quality factor is presented. The operational transconductance amplifier (OTA) in this Gm-C filter design is implemented by a low-voltage simple cascode OTA. The transconductance can be digitally programmable. Simulations show that the center frequency can be tuned from 400 MHz to 1 GHz for a 2.0 pF capacitive load. This filter has been designed in a TSMC 0.18 mu digital process with 1.8 V power supplies and consumes around 32 mW of power. View full abstract»

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  • Adaptive Conformal Antenna Design Using DSP

    Page(s): 75 - 78
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (176 KB) |  | HTML iconHTML  

    As the development of science and technology, the use of conformal antennas for vehicle applications has been increasing rapidly. Coupled with the trend is the trend toward adaptive conformal antenna design. For in actual conditions, there always exist many various factors to change the antenna performance. In this paper, we propose a novel method of adaptive conformal antenna designs to improve the performance. The design makes full use of DSP to meet the requirements. It consists of conformal antenna design, RF switch circuit design and DSP sequencer design. The design is proved to be effective in practice. View full abstract»

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  • Nonlinear Active Antenna

    Page(s): 79 - 83
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (186 KB) |  | HTML iconHTML  

    A new nonlinear active antenna is presented. The dynamics of nonlinear active phase array based on coupled oscillators and coupled phase locked loop are analyzed. Tuning the free-running frequencies of the edge oscillators, a constant phase gradient between the adjacent oscillators can be obtained. This new antenna can achieve beam-scanning without phase-shifter. Two experimental circuits are also shown. View full abstract»

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  • Broadband CPW-fed RFID Antenna at 2.45/5.80 GHz

    Page(s): 84 - 87
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (991 KB) |  | HTML iconHTML  

    A kind of half-ring folded-slot antennas with CPW-fed structure is presented. Two antennas which operate at 2.45 GHz and 5.80 GHz band are designed and fabricated respectively. The 2.45 GHz one with the size of 30 x 36 mm has bandwidth of 17.6 % (VSWR les 2:1) and gain of 1.76~2.21 dBi; the 5.80 GHz one has bandwidth of 26 % (VSWR les 2:1) and gain of 2.9~3.3 dBi, while the size is just 16 x 15 mm. By simulation and test, the radiation pattern is almost omnidirectional in the H-plane. This kind of antennas is suitable for radio frequency identification (RFID) application at 2.45/5.80 GHz. View full abstract»

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  • Variant Enhanced Dynamic Frame Slotted ALOHA Algorithm for Fast Object Identification in RFID System

    Page(s): 88 - 91
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (143 KB) |  | HTML iconHTML  

    This paper analyses the practical faults existing in enhanced dynamic frame slotted ALOHA (EDFSA) algorithms, and discusses the strategy to improve the efficiency of anti-collision algorithm in RFID system. EDFSA algorithm divides the tags into a number of groups and allows only one group of tags to respond when the number of tags is much larger than optimal efficiency tags. However the efficiency of the system can still be improved. We propose a new anti-collision algorithm called by the name of variant enhanced dynamic frame slotted ALOHA algorithm (VEDFSA) to improve the efficiency of the system that can solve the problem above by dynamic divide tags into groups during the anti-collision solving procedure. View full abstract»

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  • Switched Beam Antenna Array for UHF Band RFID System

    Page(s): 92 - 95
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (274 KB) |  | HTML iconHTML  

    A switched beam technique applied to UHF band RFID reader is proposed. The proposed switched beam circuit composed of power divider, phase shifter, and beam controlling logic circuit is implemented on a 1x2 array antenna, and resulted in a -30 to 30 degrees beam switching range in three discrete angles. This capability not only enhances the sensing range and distance but also reduces the possible EMI interference. In addition, this array antenna can help effectively cancel or attenuate mutual interference among tags through antenna arrays directivity. These advantages provided by the antenna array greatly improve the performance of a RFID system in terms of scan efficiency and read rate, which makes RFID applications even more appealing. View full abstract»

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  • Experimental Study on Wideband Antenna for Wireless Communication Application

    Page(s): 96 - 100
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (777 KB) |  | HTML iconHTML  

    Wire cutting metal folded monopole antenna fed by mini-coaxial cable back with a thin printed ground-line for bandwidth enhancement is proposed and experimentally investigated. Both impedance and radiation characteristics of this antenna are studied. Experimental results indicate that a return loss les -8 dB bandwidth cover CDMA (824-894 MHz), GSM (880-960 MHz), DCS (1710-1880 MHz), PCS (1850-1990 MHz) and WCDMA (1920-2170 MHz) bands is demonstrated. Experimental results are shown to verify the validity of theoretical work. View full abstract»

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  • A Novel 2.4GHz CMOS Low Nose Amplifier Based on Cascode Feekback Topology

    Page(s): 101 - 104
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (200 KB) |  | HTML iconHTML  

    In this paper, a low noise amplifier based on cascode feedback topology was proposed for 2.4 GHz wireless LAN application. The design was simulated with TSMC 0.18 design kit by using ADS software. The simulation result shows that the designed LNA achieves quite high quality. With 1.8 V power supply, the impedances of input and output arrive at rather matched value of 50 ohm. The gain reaches to 15.15 dB, with 0.62 dB of low noise figure, and the power consumption is as low as 7.9 mw. View full abstract»

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