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Microwave and Millimeter Wave Technology Proceedings, 1998. ICMMT '98. 1998 International Conference on

Date 18-20 Aug. 1998

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  • ICMMT'98. 1998 International Conference on Microwave and Millimeter Wave Technology. Proceedings (Cat. No.98EX106)

    Publication Year: 1998
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    Freely Available from IEEE
  • Discussion on rated average power of double-ridged corrugated waveguide

    Publication Year: 1998 , Page(s): 921 - 924
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    The average power of superwide-band corrugated waveguide, i.e. double-ridged corrugated waveguide are discussed here. The rated average power is one of the three major parameters for expressing electrical performance of transmission lines. Consequently, the rated average power both of types JRS 3500 and JRS 7500 corrugated waveguides are analyzed, and the relationship between average power and the temperature elevation of corrugated waveguide are given. At the same time, the rated average power of the waveguides with different corrugation depths are calculated. The results can meet the engineering requirements. View full abstract»

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  • Software implement of EMC analysis and design for electric system

    Publication Year: 1998 , Page(s): 1076 - 1078
    Cited by:  Papers (1)
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    In this paper, a software implementation of EMC analysis and design for electric systems is discussed. In a common sense, the EMC analysis uses s stepwise-filtering method, which can be split into two parts: the computing part and the management part. Using computer software the managing can be implemented part in common appearance; the computing part can be modified based on factual instance. An EMC analysis and design software for a large electric system was achieved successfully by using these techniques. View full abstract»

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  • Index to Authors

    Publication Year: 1998 , Page(s): 1095 - 1104
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    Freely Available from IEEE
  • Linear theory of electromagnetic wave generation in a magnetized plasma-filled backward wave oscillator

    Publication Year: 1998 , Page(s): 539 - 544
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    The linear theory of electromagnetic radiation from a magnetized plasma-filled backward wave oscillator with a sinusoidally corrugated slow wave structure driven by a solid intense relativistic electron beam has been given, and the dispersion relation has been obtained View full abstract»

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  • Polarization characteristics under street microcells including radiation pattern of base station

    Publication Year: 1998 , Page(s): 376 - 379
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    In recent years, mobile telecommunication has become very popular, and a high capacity system is required. The base station antennas of the conventional system are installed in locations higher than roofs for implementing the macro cell system, therefore high gain and beam-tilted antennas are used for a high capacity system. On the other hand, the Personal Handy-phone System (PHS) had been in use in Japan since 1995. In this system, base station antennas are of relatively low gain and colinear arrays are widely used, because of their easy installation and low cost. They are generally installed on the top of public telephone boxes, on street utility poles, or the roofs of buildings, in order to obtain the high capacity system by implementing a micro/pico cell system. In this paper, we present propagation measurements under a street environment by using several antennas, and investigate their propagation characteristics from the view point of the polarization and radiation pattern of the base station antenna View full abstract»

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  • Null control of pattern in antenna design

    Publication Year: 1998 , Page(s): 353 - 356
    Cited by:  Papers (1)
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    In this paper, the null distribution of an antenna pattern is analyzed. The antenna pattern and its sidelobe level have close relations with the null distribution. Null analyses may also be used in antenna design. Furthermore, the problem of the integrity of sum and difference patterns is discussed here, with some characteristics and relations revealed View full abstract»

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  • ECM calls for HPM vacuum tubes

    Publication Year: 1998 , Page(s): 787 - 790
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    The trend towards the use of solid-state amplifiers in the fields of ECM has accelerated in recent years. One can not ignore the fact that more and more solid-state devices are being used in multi-beam jammer or phased array stand off jamming equipment. However, ECM calls for HPM vacuum tubes. This paper compares the use of HPM tubes with that of solid-state devices in ECM applications. The concept of ECM is expanded with the introduction of HPM. A brief study shows that it is necessary to develop HPM tubes View full abstract»

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  • Fractal characterization of electromagnetic scattering waves from rough sea surfaces

    Publication Year: 1998 , Page(s): 1036 - 1039
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    Based on the sea power spectrum, a fractal model of equilibrium gravity waves is founded. The analytical closed-form formulation of the scattering coefficient is also presented. Then the fractal dimension of the backscattered wave is extracted by the box-counting technique, and its relation with the parameters of the sea surface and radar system are discussed. The results obtained are useful for target detection on the rough sea surface and remote sensing View full abstract»

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  • Quasi optic lens antenna with corrugated feed horns

    Publication Year: 1998 , Page(s): 382 - 386
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    A quasi-optic lens antenna with corrugated feed-horns in the balanced hybrid mode is investigated here using Gaussian beam-mode analysis. The relationships between beam parameters and geometric parameters of the horns and lens are given. Depending on required highest gain, low sidelobes or truncation, the optimal locations of the lens relative to the horns can be determined View full abstract»

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  • A study on dual-polarization receiving antenna

    Publication Year: 1998 , Page(s): 360 - 362
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    Combining the individual operating principle of Cassegrain and parabolic antennas, a new type of antenna for dual-polarization reception is investigated. By using two feed groups and a metal grid polarizer, simultaneous reception or transmission for two kinds of polarized electromagnetic wave which are perpendicular to each other has been realized. In this paper, the experimental and measured results at X-band are given View full abstract»

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  • Application of microwave drying equipment in glass fiber production line

    Publication Year: 1998 , Page(s): 821 - 824
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    This paper presents a description microwave equipment for glass fiber drying. It is the first product in the glass fiber industry of China. It can greatly save energy, increase output, raise product quality and improve the working environment. This technique represents the direction of modernization of the glass fiber industry View full abstract»

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  • Use of high Tc superconducting YBCO microbridge for detection of wavelength 3 mm

    Publication Year: 1998 , Page(s): 686 - 689
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    Superconducting microbridge has high sensitivity and low noise. We have successfully developed High Tc superconducting detector of microbridge structure with area of 10×20 μm. At 500 K, its responsitivity is R=8.9×104 v w-1, the detectivity D* is 4.5×1010 cm Hz1/2 w-1. Using such a detector, we have detected submillimeter wave and millimeter wave. For wavelength of 3 mm, the achieved responsitivity R is 6.01×102 v w-1 and detectivity D* is 6.1×108 cm Hz1/2 w-1. Our work has opened a new way to use this kind of detector View full abstract»

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  • Analysis of plane-wave scattering by bigratings

    Publication Year: 1998 , Page(s): 40 - 43
    Cited by:  Papers (1)
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    We present here a rigorous analysis of the plane-wave scattering by a class of bigratings, each of which consists of two separated gratings that may have different periods and different orientations. Inherently, this is a three-dimensional boundary value problem, regardless of the incidence condition. An exact formulation based on the method of mode matching is carried out, taking into account the effect of polarization couplings. Numerical results are shown for identifying physical phenomena associated with the class of bigrating structures. In particular, Wood's anomalies in the presence of a bigrating are carefully examined and the results are interpreted in terms of those well known for single gratings View full abstract»

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  • An engineering method of single channel for dual amplitude and phase comparison

    Publication Year: 1998 , Page(s): 476 - 479
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    In amplitude comparison and phase comparison widely used in engineering applications, one major problem annoying engineers is the amplitude and phase matching among the channels. A method using one channel for dual amplitude and phase comparison is proposed in this paper. The principle of the method is presented in detail, and the equivalent error of one such channel for amplitude and phase comparison is analyzed. The analysis with the simulation shows the typical value of mismatching between the two paths is under about 1 dB in amplitude and 10 degree in phase View full abstract»

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  • Complex permittivity and permeability measurements for high-loss material in a waveguide

    Publication Year: 1998 , Page(s): 201 - 204
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    A partially filled waveguide is presented to measure complex permittivity and permeability simultaneously at microwave frequency. The mode-matching method is used to analyze the higher-order modes in the waveguide. Experimental results agree well with theoretical results View full abstract»

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  • Microwave response of epitaxial high Tc-TlBaCaCuO superconducting thin films

    Publication Year: 1998 , Page(s): 682 - 685
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    We have investigated the microwave response of the epitaxial TlBaCaCuO thin films on LaAlO3 substrates. The distinction between the bolometric and nonbolometric response is presented by comparison of the characteristic of the responses at different temperatures, bias currents, and chopping frequencies. The bolometric microwave response of the films is proportional to the dR/dT of the films, while the nonbolometric response not proportional to the dR/dT of the films and the peak microwave response was found to be almost independent of the chopping frequency View full abstract»

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  • Liquid dielectric measurement by using YIG resonator

    Publication Year: 1998 , Page(s): 193 - 196
    Cited by:  Papers (1)
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    A method to determine the dielectric constant of liquid dielectric by measuring the shift of resonant frequency and of change Q's value of YIG ferrite resonator is presented. This method is suitable for microwave wide-band measurements of liquid dielectric materials with simple equipment View full abstract»

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  • Some recent progress on the superresolution, multiresolution and multichannel analysis in electromagnetics

    Publication Year: 1998 , Page(s): 48 - 52
    Cited by:  Papers (1)
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    The superresolution, multiresolution and multichannel analysis have many applications in electromagnetics. This paper presents a brief review of these applications. Some techniques for improving the performance in microwave imaging are enumerated. A frame for multiresolution in computational electromagnetics is introduced which gives a clue to the establishment of new methods View full abstract»

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  • A study of near field microwave goniometry

    Publication Year: 1998 , Page(s): 501 - 504
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    In this paper, the concept of near field microwave goniometry is introduced. Waveform design for a typical short-range PD radar is expounded. Some experimental results and analysis for an X-band cylindrical azimuth sensor prototype are given View full abstract»

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  • 8 mm GaAs power monolithic integrated circuit

    Publication Year: 1998 , Page(s): 222 - 225
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    The design, fabrication and performance measurement of an 8 mm monolithic IC based on a GaAs MESFET device with a 0.4 μm gate width are presented. The performance characteristics of the MIMIC are: Pout>100 mW, Ga>3 dB, Poutmax=150 mW at 32-33 GHz View full abstract»

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  • Application of the difference threshold test on asynchronous BFSK frequency-hopped multiple access systems

    Publication Year: 1998 , Page(s): 170 - 173
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    The new side information generating mechanism, difference threshold test (DTT), is proposed to improve the capacity of asynchronous frequency-hopped multiple access system with binary frequency shift keying (BFSK) signaling over Rayleigh fading channels. By adjusting the threshold in the DTT decision logic, the optimum capacity can be obtained and proved advantageous over that with conventional hard decision. For the systems with signal-to-noise ratio ranging from 10 to 13 dB, this improvement can be over 12% View full abstract»

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  • Miniature microstrip passband filters using dual-mode of multi-meander loop resonators for HTS applications

    Publication Year: 1998 , Page(s): 889 - 892
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    A novel compact narrowband bandpass microstrip filter using degenerate modes of multi-meander loop resonators was analysed in HTS 2-pole and 4-pole realizations and found to have high performance, selectivity, and, substantial size reduction compared with current designs. A two-pole Copper filter of this type, scaled nearly 8 times larger (70×70) to operate at a central frequency of 142 MHz and bandwidth of 1.4% was fabricated, tested and compared with the prediction of a CAD tool to validate predictions for other analyzed designs of 2-pole and 4-pole filters View full abstract»

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  • The local restitution of GPS time at Shanghai Observatory

    Publication Year: 1998 , Page(s): 467 - 471
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    Local restitution of GPS time (LRGPST) at Shanghai Observatory (SO) is the synthesized results for GPS time with multi-satellites at UTC 0h. It is obtained by using the method of the cubic spline function to interpolate smooth and weight averaging for the GPS time comparison data received from a single satellite at a different moment. With calculated results from LRGPST data during 1995-1996, it shows that the effects of selective availability (SA) have basically been removed from the statistical characteristics whose level is similar to or a little better than the results of a single satellite without SA effects (such as PRN15). It can improve the long term reliability of international GPS time synchronization results. With comparison, the system deviation corrected value Δt for international GPS time synchronization in [BIPM-SO] and [USNO-SO] are about +3.7 ns and +21.0 ns respectively. Their uncertainty are 7.2 ns and 8.8 ns respectively View full abstract»

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  • Problems on demonstration of the electric field producing the magnetic field

    Publication Year: 1998 , Page(s): 602 - 606
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    It is well known that Maxwell had extended Faraday's two experiments and modified Ampere's circuit law to have obtained the celebrated thesis of induced magnetic field produced by a time varying electric field. This paper is concerned with the root of the formula ∇×H=JD, and points out that: 1. electric displacement does not exist in our space; 2. displacement current is unwarranted; 3. curlization reformation is wrong; 4. convexization reformation is of no avail; and 5. it is impossible that flow of the electric field produces the induced magnetic field View full abstract»

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