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6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003

Oct. 28 2003-Nov. 1 2003

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Displaying Results 1 - 25 of 214
  • ISAPE'03. 2003 6th International Symposium on Antennas, Propagation and EM Theory (IEEE. Cat. No.03EX681)

    Publication Year: 2003
    Request permission for commercial reuse | PDF file iconPDF (693 KB)
    Freely Available from IEEE
  • A new type of X-band data transmission antenna used on CBERS-1 satellite

    Publication Year: 2003, Page(s):1 - 6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (290 KB) | HTML iconHTML

    In consideration of poor space of mounting plan towards the Earth and some technical reasons, the shaped reflector will not be recommended to use for the CBERS-1 satellite, therefore a backfire helical antenna occupied a small space is adapted for IR-MSS data transmission antenna(DTA) on the CBERS-1 instead of the shaped reflector. The antenna's performance and function is similar to that of the s... View full abstract»

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  • Dual-band circularly polarized microstrip-fed shorted ring-slot rectenna

    Publication Year: 2003, Page(s):7 - 10
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (253 KB) | HTML iconHTML

    A dual-band circularly polarized (CP) microstrip-fed shorted ring-slot rectenna (rectifying antenna) was designed and its reception performance from both broadside directions was measured and compared at 2.45 GHz and 5.8 GHz ISM bands. CP performance at the lower frequency band was very similar for both directions of reception whereas considerable deviation was detected at the higher frequency ban... View full abstract»

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  • A spiral antenna with a circular reflector

    Publication Year: 2003, Page(s):11 - 14
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (177 KB) | HTML iconHTML

    A numerical solution for a spiral antenna with a finite reflector is presented. The analysis is based on the method of moments (MoM) and Galerkin's matching. The antenna geometric parameters are optimized to obtain the best circular polarization (CP) axial ratios (AR) in the main beam of the pattern. A block matrix inversion technique is used for the computation to be more efficient. Simulated res... View full abstract»

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  • Reduced-size slot antennas with low cross polarization

    Publication Year: 2003, Page(s):15 - 18
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (146 KB) | HTML iconHTML

    In this paper, small slot antennas with low cross polarization are investigated. We employ a symmetrical meander slot structure to design a reduced size slot antenna fed by a microstrip line. It acts as a multiple-folded slot loop antenna with an area reduction up to 50%, while the cross-polarization less than -30 dB can be achieved. The analysis and design of the antennas are accomplished using a... View full abstract»

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  • The analysis of smaller offset broad-wall longitudinal slots

    Publication Year: 2003, Page(s):19 - 22
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (167 KB) | HTML iconHTML

    A low profile, high gain, and lightweight economical structure antenna can be easily configured by using the broad-wall longitudinal slot array antennas. When a waveguide slot array has more elements and its radiation pattern has a lower side lobe, the smaller conductance is needed for some slots so as to ride on the central line of the waveguide. In this paper, the analysis of small offset longit... View full abstract»

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  • Characteristics of coaxial cable antenna with a ring slot for RTA

    Publication Year: 2003, Page(s):23 - 26
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (221 KB) | HTML iconHTML

    Radiofrequency thermal ablation (RTA) is becoming one of the treatment for small but inoperable tumors of the liver. In this paper, we designed the applicator composed of coaxial cable antenna with a ring slot for RTA. To optimize the maximum output of radiation at 2450 MHz, we simulated the antenna using electromagnetic simulation tools Maxwell program and analyzed the return loss and the electri... View full abstract»

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  • Excitation of a modified slotted cone antenna

    Publication Year: 2003, Page(s):27 - 29
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (171 KB) | HTML iconHTML

    The model excitation problem for a special slotted cone antenna is considered periodical slots are cut along rulings of the cone that has an isotropic one inside. The problem solution method uses the Kontorovich-Lebedev integral transforms and the Riemann-Hilbert problem method. The analytical solution is obtained for a semi-transparent exterior cone. Slots effects are analyzed by virtue of given ... View full abstract»

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  • Optimal design of broadband loaded receiving antenna for HFSWR using simulated annealing

    Publication Year: 2003, Page(s):30 - 33
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (233 KB) | HTML iconHTML

    One of the major challenges in using coast-based high frequency surface wave radar (HFSWR) is, for the purpose of the long-range detection of ships and aircraft as well as icebergs, or the remote sensing of the ocean environment using the coast-based HFSWR, how the size of transmitting and receiving antennas are reduced at lower end of the HF band. In this paper, according to the operating frequen... View full abstract»

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  • Investigation on trapped rectangular dielectric resonator antennas

    Publication Year: 2003, Page(s):34 - 37
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (151 KB) | HTML iconHTML

    In this paper, investigation on trapped rectangular dielectric resonator antenna(TRDRA) having a dielectric constant "/spl epsi/r" in the range of 10-100 is reported . Radiation Q-factors of lowest order "magnetic-dipole" modes are derived on the basis of first order theory . The radiation Q- factors for various /spl epsi/r is computed and the graph is plotted. View full abstract»

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  • Analysis of omnidirectional waveguide slots array antennas

    Publication Year: 2003, Page(s):38 - 41
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (201 KB) | HTML iconHTML

    This paper proposes a new approach for analyzing waveguide slots and their arrays. It considers the whole waveguide structure with slots cut on conducting walls as a complete antenna system. Based on this idea, the electric field integral equation (EFIE) is formulated in a standard way, and the integral equation is then solved using the method of moments where the Rao, Wilton and Glisson (RWG) fun... View full abstract»

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  • FDTD analysis of radiation from monopole antenna with plasma coating

    Publication Year: 2003, Page(s):42 - 45
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (153 KB)

    To analyze the radiation of a monopole covered with plasma, a shift operator method in FDTD is applied. By using this scheme we compute the radiation of a monopole antenna with the coverage of plasma. We observe from the numerical results that the plasma can greatly absorb electromagnetic waves and can impede the Gaussian pulse travelling along the antenna. In addition, the high frequency componen... View full abstract»

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  • Design synthesis of patch antennas with direct feed, broadband L-probe and bandwidth controlled T-square feeds

    Publication Year: 2003, Page(s):46 - 49
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB) | HTML iconHTML

    The article presents the design synthesis of patch antennas with direct feed, L-probe feed, and T-square feeds. The experience and insights gained from the physics of the EM has been used to innovate new designs of the existing devices. The results of the design were conceptualized by interpreting the results gained in (a) patch of thin substrate with a direct feed, (b) patch with a thick substrat... View full abstract»

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  • Broadband square microstrip patch antenna with suspended parasitic element

    Publication Year: 2003, Page(s):50 - 53
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (163 KB) | HTML iconHTML

    An experimental investigation is presented on the impedance bandwidth of an electromagnetically coupled, probe-fed square microstrip patch antenna with suspended parasitic. A bandwidth of 25.5 % is achieved around a center frequency of 5.441 GHz. Measurements on gain and patterns are also presented. The antenna presented is small in the overall size, i.e. 55 mm * 55 mm, and suitable for use in pla... View full abstract»

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  • Wideband microstrip monopole slot antenna

    Publication Year: 2003, Page(s):54 - 57
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (227 KB) | HTML iconHTML

    Microstrip antennas have played an important role in the field of wireless communications in the past few decades. It is required in applications such as mobile handsets, PC cards or in PCS, miniaturized as well as wideband antennas. Engineers and researchers have made extensive efforts to miniaturize microstrip antennas, but small antennas inherently have narrow bandwidth. However, in order to tr... View full abstract»

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  • Transmission line model analysis: a novel GSM/DCS dual-band single layer patch antenna

    Publication Year: 2003, Page(s):58 - 61
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (185 KB) | HTML iconHTML

    A novel GSM/DCS dual-band single layer patch antenna is presented, it covers the bands of (890-960) MHz for GSM and (1710-1880) MHz for DCS with VSWR /spl les/2. This antenna consists of a ground plane, air layer, and a metal patch layer printed on a thin substrate with lower permittivity. The initial sizes of the antenna are determined by using of transmission line model, then, the performances o... View full abstract»

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  • Design of stacked circular/quasi-elliptical patch array for broadband CP applications

    Publication Year: 2003, Page(s):62 - 65
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (282 KB) | HTML iconHTML

    This paper presents a design of circularly polarised 4-element planar subarrays composed of low axial-ratio stacked patch elements in X-band. The wideband circular polarisation is excited using stacked circular disc and quasi-elliptical patch that printed on a superstrate with low dielectric constant (/spl epsi/ = 2.2) and a high dielectric constant (/spl epsi/ = 6.15) material as the substrate, r... View full abstract»

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  • Dual-mode patch antenna with PIN diode switch

    Publication Year: 2003, Page(s):66 - 69
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (193 KB) | HTML iconHTML

    Recently, since various wireless communication services such as the PDC, the PHS, and the wireless LAN are provided, it is required to make a mobile terminal to handle several wireless communication services. Generally, these services operate at different frequencies with different polarization and radiation characteristics. Therefore, it is necessary to design a multi-mode antenna which has multi... View full abstract»

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  • An optimization technique for the design of S-band patch antenna array suitable for dual-frequency operation

    Publication Year: 2003, Page(s):70 - 73
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (166 KB) | HTML iconHTML

    In this paper we present the design and optimization approach for the development of S-band microstrip antenna array system with integrated diplexer. The optimization technique using a commercial MoM based solution is discussed in details. The design technique for the microstrip diplexer is also discussed. Measured results display exemplary accuracy with simulated results thereby justifying the us... View full abstract»

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  • Cylindrical conformal microstrip bow-tie antennas

    Publication Year: 2003, Page(s):74 - 76
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB) | HTML iconHTML

    Microstrip bow-tie antenna (MBA) conformal to cylinder with small curvature radius is studied. The simulation of return loss and radiation patterns of one-element cylindrical conformal microstrip bow-tie antenna (CCMBA) and two-element CCMBA array is presented. It is shown that CCMBA with small curvature radius can also achieved a large bandwidth, though the resonant frequency and the radiation pa... View full abstract»

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  • Characteristics of the broadband cylindrically conformal microstrip antennas with capacitance compensation probe feed

    Publication Year: 2003, Page(s):77 - 80
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (205 KB) | HTML iconHTML

    The input impedance and the radiation pattern of the stacked cylindrically conformal microstrip patch antenna element with capacitance compensation probe feed and the mutual coupling effect between two elements of this kind are calculated by using a novel hybrid method that combines the conformal FDTD method and the Green's functions for cylindrically stratified media. Numerical results demonstrat... View full abstract»

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  • A microstrip antenna element for satellite communication

    Publication Year: 2003, Page(s):81 - 85
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (233 KB) | HTML iconHTML

    This paper gives a detailed analysis on the impedance and radiating characteristics of a micro-strip patch antenna by computer simulation. Some relationships between its size and characteristic parameters have been found. A new structure of micro-strip antenna is presented based on the analysis, which can be used in VSAT station and satisfied with the following requirement of C-band satellite comm... View full abstract»

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  • Design of UHF synthesize aperture radar antenna

    Publication Year: 2003, Page(s):86 - 88
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (170 KB) | HTML iconHTML

    Aiming at spreading bandwidth of SAR, this paper puts forward a new type of prism radar antenna. The feed based on techniques of CPW is a two-component antenna array liking H printed by dubble plane overlap. The antennas frequency bandwidth gets to 2.2 times frequency and is designed larruping. VSWR within the bandwidth is less than 1.8, gain and the centural frequency is more than 9dBi. The paper... View full abstract»

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  • Wideband L-probe coupled patch antennas mounted on planar or cylindrical structures

    Publication Year: 2003, Page(s):89 - 91
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB) | HTML iconHTML

    A microstrip patch with an L-shaped probe is wide in bandwidth while maintaining simple construction geometry. In this paper, its application for the development of base station antennas is discussed. View full abstract»

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  • A high directivity patch antenna using a PBG cover together with a PBG substrate

    Publication Year: 2003, Page(s):92 - 95
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (213 KB) | HTML iconHTML

    A high directivity patch antenna using a photonic bandgap (PBG) cover together with a PBG substrate is designed. The input return loss, radiation pattern and directivity of this antenna are studied by the finite-difference time-domain method. The directivity of the PBG antenna is greatly improved. Experimental results are also reported to verify the design. View full abstract»

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