By Topic

Microwave and Millimeter Wave Technology, 2008. ICMMT 2008. International Conference on

Date 21-24 April 2008

Go

Filter Results

Displaying Results 1 - 25 of 146
  • International conference on microwave and millimeter wave technology, 2008

    Publication Year: 2008 , Page(s): c1
    Save to Project icon | Request Permissions | PDF file iconPDF (1652 KB)  
    Freely Available from IEEE
  • Schedule for ICMMT2008/GSMM2008

    Publication Year: 2008
    Save to Project icon | Request Permissions | PDF file iconPDF (128 KB)  
    Freely Available from IEEE
  • 2008 international conference on microwave and millimeter wave technology proceedings Volume 4

    Publication Year: 2008 , Page(s): ii
    Save to Project icon | Request Permissions | PDF file iconPDF (166 KB)  
    Freely Available from IEEE
  • [Copyright notice]

    Publication Year: 2008 , Page(s): iii
    Save to Project icon | Request Permissions | PDF file iconPDF (118 KB)  
    Freely Available from IEEE
  • Program

    Publication Year: 2008
    Save to Project icon | Request Permissions | PDF file iconPDF (225 KB)  
    Freely Available from IEEE
  • Session I24P1 PBG and metamaterials (II)

    Publication Year: 2008 , Page(s): 1601
    Save to Project icon | Request Permissions | PDF file iconPDF (61 KB)  
    Freely Available from IEEE
  • Performance improvement of microstrip patch antenna and array with electromagnetic bandgap structure

    Publication Year: 2008 , Page(s): 1602 - 1605
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (590 KB) |  | HTML iconHTML  

    A microstrip patch antenna with the EBG structure is proposed. The performance improvement of the antenna demonstrates that the EBG structure has effects on surface wave suppression and broadside radiation power reduction. 4 columns of EBG structure are embedded between array elements for mutual coupling reduction. An 12 dB mutual coupling reduction is achieved significantly. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Locating the operation-band of PBG waveguide using LHM concept

    Publication Year: 2008 , Page(s): 1606 - 1608
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (405 KB) |  | HTML iconHTML  

    This paper presents an approach to locate the operation-band of a quasi TEM waveguide loaded PBG with the uniform electric field distribution along the waveguide cross section by using left-handed material performance of the PBG waveguide. We first measure the S-parameter of the PBG waveguide, and then extract the refraction index, effective permittivity and effective permeability from these S-parameter though the extraction method for the constitutive parameters. It can be observed that these values are all negative in two frequency intervals, and the lower frequency interval is just corresponding to the operation-band of the PBG waveguide with the uniform electric field distribution along the waveguide cross section. This approach avoids the direct measurement of the E-field along the cross section of the PBG waveguide as well as the corresponding complicate E-field measurement circuit. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A novel broadband EBG using multi-period mushroom-like structure

    Publication Year: 2008 , Page(s): 1609 - 1612
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (429 KB) |  | HTML iconHTML  

    A novel broadband electromagnetic band-gap (EBG) structure is presented using multi-period mushroom-like structure with different patch size cascaded. Direct transmission method is used to determine the band-gap of the EBG structure. The effects of the unit number and patch size on the mushroomlike EBG structure are investigated. Two kinds of unit with different patch size are cascaded to enlarge the band-gap of EBG structure, which achieves almost 87.1%. The simulation results show that the band-gap almost covers the stop-band produced by the two uniform configurations with different patch size respectively. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A novel metamaterial-inspired electrically small antenna fed by CPW

    Publication Year: 2008 , Page(s): 1613 - 1616
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (469 KB) |  | HTML iconHTML  

    This article presents the design of an inexpensive, efficient, and electrically small antenna based on metamaterial- inspired structure fed by the coplanar waveguide (CPW). The size of the proposed antenna is 12 mm x 12 mm with the resonant frequency of 1.47 GHz. Details of the proposed antenna are presented, with full-wave simulation results to support the design. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A planar microstrip implementation of dual-composite right/left handed transmission line

    Publication Year: 2008 , Page(s): 1617 - 1619
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (393 KB) |  | HTML iconHTML  

    In this paper, a planar microstrip dual-composite right/left-handed transmission line (D-CRLH TL) is proposed. It only includes interdigital capacitor and simple strip elements, which can be easily designed and applied to microwave devices and systems. An effective model is also presented to show its characteristics. This model is more exact than the ideal one. The balanced condition is valid in this D-CRLH model for broadband matching. It exhibits tri-band: the lower right-handed (RH) band, the middle left-handed (LH) band and the higher RH band, which is much different from ideal D-CRLH Three unit cells of D-CRLH TL are simulated by CST MWS. The whole structure exhibits a DC to 3.4 GHz RH band, a 5.4 GHz to 7.5 GHz LH band and 7 GHz to 10 GHz RH band. The reflectance in pass- band is less than -10 dB. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Coupling characteristics between composite right-/left-handed transmission line and conventional transmission line

    Publication Year: 2008 , Page(s): 1620 - 1623
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (414 KB) |  | HTML iconHTML  

    The coupling characteristics between a composite right/left-handed transmission line (CRLH TL) with lumped-elements and a conventional right-handed transmission line (RH TL), is studied. It is theoretically shown that tight coupling is obtained when the product of the average permittivity and average permeability is negative (epsiv macr ldr mu macr < 0), at the same time the CRLH TL is still in its left-handed region ( epsivL < 0 , muL < 0 ). ADS S-parameter simulations are demonstrated to confirm our theoretical results. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Peculiar radar cross section properties of metamaterials with zero index of refraction

    Publication Year: 2008 , Page(s): 1624 - 1626
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (366 KB) |  | HTML iconHTML  

    In this paper, based on peculiar electromagnetic characteristics of metamaterials, peculiar radar cross section properties of metamaterials with zero index of refraction are discussed. These results provide some interested insights for potential applications in radar. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Slow and frozen waves in a planar air waveguide with anisotropic metamaterial cladding

    Publication Year: 2008 , Page(s): 1627 - 1630
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (503 KB) |  | HTML iconHTML  

    We have studied the wave guiding properties of a planar air waveguide with anisotropic metamaterial cladding. Through complete analysis of the guiding modes for different cladding metamaterials, we demonstrate that slow and even frozen electro-magnetic wave can be supported by such an air waveguide. We have also proposed practical realization of the metamaterial by multilayer structure consisting of silver and silicon dioxide thin films, and constructed such air waveguide. We show that the slow and frozen wave can still be supported in this practical structure with consideration of the material dispersion. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Magnetic resonance leads to negative refraction

    Publication Year: 2008 , Page(s): 1631 - 1633
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (380 KB) |  | HTML iconHTML  

    We report negative refraction observed in simulation of a prism comprised of modified split-ring resonators, which are well-known metamaterial particles with magnetic response to incident waves. Microscopic composition of the metamaterial prism is analyzed and negative refraction is explained by effective medium theory. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A novel compact uni-planar electromagnetic band-gap (UC-EBG) structure

    Publication Year: 2008 , Page(s): 1634 - 1636
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (416 KB) |  | HTML iconHTML  

    A novel uni-planar electromagnetic Band Gap (EBG) structure incorporated with spiral shape capacitor and meandered line inductor(SC-ML-EBG) is presented. This structure significantly enlarges the equivalent capacitance between neighboring elements, as well as increases the equivalent inductance. So, it becomes even more compact in size. A comparison has been carried out between this new structure and the conventional UC-EBG structure. The simulation result shows that its center bandgap frequency depresses over 50% than that of the conventional UC-EBG in the same period of the lattice. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A small dual-band EBG structure for microwave

    Publication Year: 2008 , Page(s): 1637 - 1639
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (402 KB) |  | HTML iconHTML  

    A novel dual-band compact electromagnetic-bandgap (EBG) structure is presented. This structure introduces a interdigital-spiral shape stripline to enlarge the inductance effect, which can extremely reduce the period of the lattice. Further more, it utilizes concave patches and convex patches to arrange alternately for dual band purpose. It also can be applied to design a reconfigurable multiband EBG structure. In this paper, its design is detailed, and several simulation are presented. The result proves that the design is effectively. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Session I24P2 Microwave antennas (III)

    Publication Year: 2008 , Page(s): 1640
    Save to Project icon | Request Permissions | PDF file iconPDF (61 KB)  
    Freely Available from IEEE
  • Fractaly terminated line-fed Microstrip slot antenna

    Publication Year: 2008 , Page(s): 1641 - 1643
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1047 KB) |  | HTML iconHTML  

    In this paper a Microstrip slot antenna fed by a fractaly terminated line is proposed. The return loss, input impedance, and radiation pattern of such a structure were studied and the effect of the fractal iterations were compared to the traditional simple line fed microstrip slot antenna. It would be shown that the bandwidth of such a structure is more than 80% which is evidently more than triple times greater than non fractal geometries and it covers the entire S-band. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A compact square-ring printed monopole ultra wideband antenna

    Publication Year: 2008 , Page(s): 1644 - 1646
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (686 KB) |  | HTML iconHTML  

    A simple and compact microstrip-fed ultra wideband (UWB) printed monopole antenna is proposed in this paper. The antenna is composed of a square ring and occupies about 7.91 GHz bandwidth covering 3.09-11 GHz. The experimental and simulated results exhibit good agreement. The characteristics of the proposed antenna are analyzed, and the geometry parameters for optimal performance are also investigated in detail. A quasi-omnidirectionally and quasi- symmetrically radiation pattern in y-z plane is obtained. The results measured or simulated validated that the antenna satisfies the requirements of UWB communications, and will be a good solution for UWB applications. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A microstrip-fed wide-band tapered slot antenna

    Publication Year: 2008 , Page(s): 1647 - 1650
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (596 KB) |  | HTML iconHTML  

    Research on wide-band, low-profile antennas has been steadily increasing in the past several years due to more demanding requirements from the aerospace industry. This paper presents the simulation investigations of a printed microstrip slot antenna. It provides a wide impedance bandwidth adjustable by variation of its parameters, such as the relative permittivity and thickness of the substrate, width, and location of the slot in the ground plane, and feed and ground plane dimensions. The ground plane is small,40 mm 63mm. The antennas intrinsic weakness (the bandwidth is narrow), limits its application. Research of expanding its bandwidth seems more important. This paper shows a kind of structure of expanding bandwidth of a microstrip-fed slot antenna.The benefit in the band keeps above the 3dB. And it makes the antenna keeping impedance matched well from 2.6GHz to 9GHz (S11 = -10dB). View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimized desgin of circularly polarized wideband stacked microstrip antenna with single-fed

    Publication Year: 2008 , Page(s): 1651 - 1653
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB) |  | HTML iconHTML  

    A method of developing the quality of circularly polarized microstrip antennas using the "almost square" patch is presented particularly. Antennas are designed and optimized with patches printed on foam and common dielectric substrate, which separately have over 17% and 14% 3 dB axial ratio (AR) bandwidth. The latter has been fabricated and measured, the measurements agree well with simulated results. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A UWB antenna with novel L branches on ground for band-notching application

    Publication Year: 2008 , Page(s): 1654 - 1657
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (921 KB) |  | HTML iconHTML  

    In this paper, one L-branch-on-ground structure for band-notching UWB printed-elliptical-slot (PES) antenna is presented. The L branch is connected to the ground other than the antenna element. It is used for cutting the 5.8 GHz band. Compared with the U slot, T branch in the antenna element, L branch on ground is flexible because the point connecting to the ground can change in a big range. Because the antenna is PES antenna, it is compact only 24*29*1 mm3. At the same time, the paper analyzes the electromagnetic fields and presents the electronic fields and magnetic fields are resonating at different zones of the L-branch-on-ground when band-notching. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis and design of novel directional ultra wide-band antennas

    Publication Year: 2008 , Page(s): 1658 - 1661
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (606 KB) |  | HTML iconHTML  

    Ultra wide-band is one of the hottest issues in the current researches on antennas. The circular monopole antenna is a kind of ultra wide-band antennas with simple structure. Firstly a novel antenna was researched. Four circular disc monopoles were placed across each other. They were considered as the feedings, and the reflection plane was planar. It could achieve dual polarization characteristics. On this basis, further study was applied to two other novel antennas. The first was changing the planar reflector to parabolic one, and the purpose was to realize wide beam, high gain and directed radiation characteristic. The other was changing the circular disc shape, and the purpose was to realize wider lower frequency bandwidth. The novel antennas were theoretic analyzed, and the S- parameter and radiation patterns of the antennas were discussed by electromagnetism simulation software. The analytic results verify that the characteristic of the traditional monopole antenna is effective improved by the novel antennas. Dual-polarization, high gain, wide beam and directed radiation characteristics of the antenna are realized. The novel antennas are suitable for the satellite and mobile communication systems with good prospects. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of broadband stacked E-shaped patch antenna

    Publication Year: 2008 , Page(s): 1662 - 1663
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1067 KB) |  | HTML iconHTML  

    A low cost, compact stacked E-shaped patch antenna is presented and the simulation results of its performance are investigated. The antenna input impedance bandwidth is 45% (3.1-4.9 GHz), which is better than the square patch stacked E-shape patch antenna. The dimension and position of the rectangular patch as well as the shift of coaxial probe location have been optimized to achieve this wide bandwidth and it can be used for UWB lower band applications. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.