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Microwave Theory and Techniques, IEEE Transactions on

Issue 2 • Date Feb. 1977

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Displaying Results 1 - 21 of 21
  • [Front cover - Feb. 1977]

    Publication Year: 1977 , Page(s): f1 - f2
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    Freely Available from IEEE
  • Studies in Overhead Wire - Goubau Line Above Ground

    Publication Year: 1977 , Page(s): 83 - 93
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (690 KB)  

    The transition theory which Kikuchi proposed first was improved and expanded in the range of the Sommerfeld line above ground and even the Goubau line (G line) above ground. Then it was proved by the experiment with the aid of the G line. The solution for the electromagnetic field produced by an overhead wire is derived using Maxwell's equations and treating the situation as a boundary value problem. In particular, the integrals which are caused by the finite conductivity of the earth and which are responsible for the distribution of the fields in the neighborhood of the surface of the earth are evaluated by means of the saddle-point method. Based on the field theory described above, the primary transmission line constants of the G line above ground (R, L, C, and G) and the secondary transmission line constants (gamma/sub 0/ = alpha/sub 0/ + j beta/sub 0/ and Z/sub 0/) were obtained, and then the equivalent circuit for the G line above ground was given. The behavior of the line from an engineering standpoint is now completely determined by the usual simple circuit theory. The transition of the G line from a ground return transmission line of a surface-wave transmission line was proved experimentally. View full abstract»

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  • Analysis of Straight Tapered Microstrip Transmission Lines - ASTMIC (Computer Program Descriptions)

    Publication Year: 1977 , Page(s): 164
    Cited by:  Papers (6)
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    The program ASTMIC calculates the input impedance of straight tapered microstrip transmission lines terminated with arbitrary loads. View full abstract»

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  • Contributors, Feb. 1977

    Publication Year: 1977 , Page(s): 165 - 167
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    Freely Available from IEEE
  • Membership advertisement

    Publication Year: 1977 , Page(s): b1 - b3
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  • Experimental Studies of the Losses and Radiations Due to Bends in the Goubau Line

    Publication Year: 1977 , Page(s): 94 - 100
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    The losses due to the bending of the Goubau line (G line) are determined by experiments. The losses are measured for wide ranges of radius of curvature, bending angle, and the transmission frequency. These three variables determine the losses. It is believed that radiation from a surface-wave transmission line system occurs mainly from the bends and horn in the transmission line system. Directional patterns of such radiation were obtained from measurements. View full abstract»

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  • New Edge-Guided Mode Isolator Using Ferromagnetic Resonance Absorption

    Publication Year: 1977 , Page(s): 100 - 106
    Cited by:  Papers (1)
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    A new edge-guided (EG) mode isolator is described in which nonreciprocal attenuation is due to the ferromagnetic resonance absorption caused by a strong dc magnetic field applied locally at the short-circuited edge of a ferrite microstrip line. From modal analysis, including the magnetic losses of ferrite substrate and the transversal variation of the internal dc magnetic field, the dominant EG mode has been proved to propagate along not only the conventional ferrite stripline but also a stripline with one edge short circuited to the ground. Dispersion relations and RF electric field distribution have been calculated numerically, and the upper limit of isolator bandwidth has been discussed with several design parameters. Based on the results, a practical EG mode resonance isolator has been successfully developed, which has more than 25 dB isolation loss and less than 1.0 dB insertion loss over a 4.0-8.0-GHZ frequency band throughout the - 10°C-+60°C temperature range, View full abstract»

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  • Approximate Determination of the Characteristic Impedance of the Coaxial System Consisting of a Regular Polygon Concentric with a Circle (Letters)

    Publication Year: 1977 , Page(s): 160 - 161
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (184 KB)  

    This letter gives an approximate method for the determination of the characteristic impedance of an important family of coaxial systems. The approach makes use of the method of conformal mapping, and it has already been used in other technical applications by the first author and his associates. View full abstract»

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  • Equivalent Circuits and Characteristics of Inhomogeneous Nonsymmetrical Coupled-Iine Two-Port Circuits (Short Papers)

    Publication Year: 1977 , Page(s): 140 - 142
    Cited by:  Papers (30)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB)  

    The equivalent circuits and the properties of nonsymmetrical coupled-line two-port prototype circuits in an inhomogeneous medium are presented. Potential applications include both symmetrical and non-symmetrical circuits for narrow- and wide-band applications as filters and impedance transformers. View full abstract»

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  • A Method for Calculating the Frequency-Dependent Properties of Microstrip Discontinuities

    Publication Year: 1977 , Page(s): 107 - 112
    Cited by:  Papers (66)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    A method is described for calculating the dynamical (frequency-dependent) properties of various microstrip discontinuities such as unsymmetrical crossings, T junctions, right-angle bends, impedance steps, and filter elements. The method is applied to an unsymmetrical T junction with three different linewidths. Using a waveguide model with frequency-dependent parameters, a field matching method proposed by Kuhn is employed to compute the scattering matrix of the structures. The elements of the scattering matrix calculated in this way differ from those derived from static methods by a higher frequency dependence, especially for frequencies near the cutoff frequencies of the higher order modes on the microstrip lines. The theoretical results are compared with measurements, and theory and experiment are found to correspond closely. View full abstract»

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  • Microwave Properties of Lithium Ferrites (Short Papers)

    Publication Year: 1977 , Page(s): 155 - 159
    Cited by:  Papers (5)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    Low-power loss and high-power threshold properties have been measured between 3.0 and 17.2 GHz on three Li-Ti ferrite compositions of magnetizations 1250, 2250, and 3600 G. In each composition the use of cobalt resulted in a linear increase in mu0 and hcrit. Temperature measurements were performed at 9.2 GHz on the 2250-G material. An illustration of how the data might be applied is given. View full abstract»

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  • An Application of Conformal Mapping to the Determination of the Characteristic Impedance of a Class of Coaxial Systems (Letters)

    Publication Year: 1977 , Page(s): 162 - 163
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (128 KB)  

    Numerical results for the characteristic impedance of the coaxial system consisting of a regular polygon concentric with a circle are presented. In the case of a square concentric with a circle the results are in excellent agreement with those obtained by Riblet. View full abstract»

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  • Spectral Domain Solution of Arbitrary Coplanar Transmission Line with Multilayer Substrate (Short Papers)

    Publication Year: 1977 , Page(s): 143 - 146
    Cited by:  Papers (60)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB)  

    A hybrid mode analysis is presented for a multilayer dielectric within a rectangular conducting box. An arbitrary set of conductors may be distributed along the lower surface of the top layer, so that single or coupled forms may be analyzed of slot line, microstrip, or coplanar waveguide. The analysis combines a transfer-matrix approach with the spectral domain method to give a versatile and efficient solution. CPU time on an IBM 360/65 is about 1 s per layer of substrate, for a single slot or strip, at one frequency. View full abstract»

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  • Resonance Measurement of Single- and Coupled-Microstrip Propagation Constants

    Publication Year: 1977 , Page(s): 113 - 120
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (880 KB)  

    The application of resonant techniques to the measurement of microstrip-line propagation constants is described. A review of the basic theory is given first, showing the great generality of the underlying principle. Then the particular case of a transmission line is discussed and it is shown that excellent theoretical accuracy can be achieved despite the simplicity of the procedure and the mathematics involved. Both the cases of nondispersive and dispersive propagation are covered. Finally, it is shown that the basic method can be extended to the case of symmetrical coupled lines in a straightforward way. Some results concerning practical microstrip lines are presented and compared with theoretical data. View full abstract»

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  • The Capacitances and Surface Charge Distributions of a Shielded Unbalanced Pair (Short Papers)

    Publication Year: 1977 , Page(s): 137 - 140
    Cited by:  Papers (2)
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    The capacitance matrix of an unbalanced shielded pair cable is determined theoretically. The wires of the cable are asymmetrically located about the axis of the shield and have different radii; however, the axes of the wires are restricted to lie on a line passing through the axis of the shield. The elements of the capacitance matrix are determined as particular elements of the inverse of a truncated intinite matrix, which relates the Fourier coefficients of the surface charge densities on the inner conductors and the shield to the applied voltage excitations on the cable conductors. The capacitances and surface charge distributions are evaluated numerically for a shielded pair cable, which, due to inaccuracies in the cable manufacturing processes, has one wire with a smaller or larger radius than the other wire of the pair and/or has one wire closer to or farther from the axis of the shield than the other wire of the pair. View full abstract»

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  • Full-Band Low-Loss Continuous Tracking Circulation in K Band (Short Papers)

    Publication Year: 1977 , Page(s): 152 - 155
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    The continuous tracking principle is applied to the design of a wide-band Y-junction stripline circulator for the 18-26.5-GHz frequency band. Near octave low-loss and high isolation performance is demonstrated without the need for repeated design cycles. Design data and construction details are presented. View full abstract»

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  • Back Cover, Feb. 1977

    Publication Year: 1977 , Page(s): b2 - b3
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    First Page of the Article
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  • Central Metal Post in Stripline Circulators (Short Papers)

    Publication Year: 1977 , Page(s): 150 - 152
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    A central metal post of a suitable radius increases the bandwidth of a 3-port stripline circulator considerably. It helps to realize a compact circulator and gives more flexibility in the design. View full abstract»

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  • A Large-Signal Theory for Broad-Band Frequency Converters Using Abrupt Junction Varactor Diodes

    Publication Year: 1977 , Page(s): 127 - 136
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    A multicurrent design theory is developed for square law varactor frequency converters having a pump freqnency much greater than the input signal frequency. Efficiency limits are derived for upconverter operation, showing in particular that any broad-band mixer, where all sideband currents around the pump frequency are allowed to flow, must involve a conversion loss of at Ieast 4.4 dB. Consideration of circuit interactions and their effect on upconverter responses leads to a design suitable for systems use in the 5.9-6.4 GHz communication band. Experimental studies of a microstrip realization of this mixer show close agreement with theoretical predictions of its behavior, including a conversion loss less than 7.5 dB over an operating range of 1.3 GHz. View full abstract»

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  • Application of MIC Formulas to a Class of Integrated-Optics Modulator Analyses: A Simple Transformation (Short Papers)

    Publication Year: 1977 , Page(s): 146 - 150
    Cited by:  Papers (13)
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    Modulation electric fields in a class of planar, lumped-parameter circuit or traveling-wave-type electrooptic modulators in integrated optics are analyzed by applying a simple transformation of variables to presently available formulas on microwave integrated circuits (MIC's). Example calculations are shown. View full abstract»

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  • A Dual Mode Tuning Circuit for Microwave Transistor Oscillators

    Publication Year: 1977 , Page(s): 120 - 127
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1024 KB)  

    A two-port circuit adjusting both even and odd mode fields, with orthogonal mode adjustment, can be used as an embedding circuit for a microwave transistor oscillator. The circuit, analyzed in TEM line, may also be realized in any other form of transmission line geometry, including two coexistent modes in a cavity. The resulting oscillator is stable, has low FM noise, and is readily tunable. Analyses of the tuning circuit and oscillator are presented, along with some experimental results and a discussion of methods using other than TEM transmission lines to produce the even and odd modes. View full abstract»

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The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design..

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