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Microwave Theory and Techniques, IEEE Transactions on

Issue 7 • Date Jul. 1980

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Displaying Results 1 - 25 of 29
  • [Front cover - July 1980]

    Publication Year: 1980 , Page(s): f1 - f2
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    Freely Available from IEEE
  • Toroidal Resonators for Electromagnetic Waves - II

    Publication Year: 1980 , Page(s): 700 - 703
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (310 KB)  

    A series solution to Maxwell's equations for toroidal geometry has been given. Approximations of the eigenfunctions and of the dispersion relation have been obtained. The existence of two groups of electromagnetic rnodes with different symmetries has been put in evidence. View full abstract»

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  • Diplexer Operation of Stripline Y Circulators: Part 1 - Basic Performance of Diplexer Operation

    Publication Year: 1980 , Page(s): 776 - 786
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1139 KB)  

    The diplexer operation as another version of tbe double circulation frequency operation (DCFO) was recently performed with stripline Y-junction loaded with conductor-ferrite (CF) composites. Experimental results demonstrated that the large insertion Iosses appeared in association with higher order circulations. This paper treats circulation adjustments for basic performance of the diplexer operation. Theoretical analysis presents a criterion upon which to test circulation adjustments in getting an idea DCFO performance in the instances of the diplexer operation. Better combinations of circulating modes for the diplexer operation, and relevant circulation adjustments are discussed. It is concluded that the main cause to the large insertion Iosses insufficiency in circulation adjustments. Experimental results are also presented. In this paper, phenomenological explanation of various circulations is given in preparation for subsequent treatment of the diplexer operation. All ferrites used are treated above resonance. View full abstract»

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  • Correction to "Rigorous Analysis of the Step Discontinuity in a Planar Dielectric Waveguide" (Letter)

    Publication Year: 1980 , Page(s): 809
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    In Fig. 7 of the above paper, the label n/sub 2/ K/sub 0/ D = 1 is incorrect. View full abstract»

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  • Comment on "Broad-Band Coupling to High-Q Resonant Loads" [Letters]

    Publication Year: 1980 , Page(s): 809
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    First Page of the Article
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  • Freely Available from IEEE
  • [Back cover]

    Publication Year: 1980 , Page(s): b1 - b2
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    Freely Available from IEEE
  • Effects of Randomization on Periodic Coupling

    Publication Year: 1980 , Page(s): 722 - 725
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    Previous analyses of periodically coupled multimoded systems have assumed equal spacing of the coupling points. In this paper, explicit simple formulas are developed to account for randomized variations of a periodically coupled system. This analysis is useful in multimoded transmission systems utilizing circular waveguides or fiber optics and in active systems such as traveling wave tubes and surface acoustic wave devices. View full abstract»

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  • Millimeter-Wave Fin-Line Characteristics

    Publication Year: 1980 , Page(s): 737 - 743
    Cited by:  Papers (43)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    This paper presents an analysis of the fin line. The spectral-domain technique is used to determine both wavelength and characteristic impedance. Numerical results are compared with known data for ridged waveguide slab-loaded waveguide, and slotline. Design curves are presented for practical millimeter-wave fin line structures. View full abstract»

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  • An 8-18-GHz YIG-Tuned FET Oscillator

    Publication Year: 1980 , Page(s): 762 - 767
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (832 KB)  

    We report here on the design and construction of a YIG- tuned FET oscillator tunable over the entire 8-18-GHz frequency range. The minimum output power from this device operating into a 50-omega load is about +6 dBm. The addition of a balanced buffer amplifier increases the power to about + 12-dBm minimum. When optimized for the 12-18-GHz band, the oscillator alone generates a minimum of + 10 dBm. The oscillator/ amplifier combination produces at least +15 dBm. We discuss a number of difficulties inherent in the design of broad-band oscillators, especially fixed frequency resonances, linearity, and power drop outs at the low end of the frequency range. View full abstract»

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  • TE Sub/011 Mode Sectorial Circular Cylindrical Cavities Filters

    Publication Year: 1980 , Page(s): 695 - 699
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (664 KB)  

    This paper presents a new cavity resonator for the TE 011 circular mode which allows a compact mechanical structure for a multiple-cavity filter and retains many electrical characteristics of larger filters. Theoretical values of Q are obtained, mode separation is demonstrated, and a 4-cavity experimental model with an elliptic transfer function is described. View full abstract»

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  • Conducting Spheres in Rectangular Waveguides

    Publication Year: 1980 , Page(s): 711 - 714
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    A conducting sphere on the center of the broad wall of a rectangular waveguide causes frequency independent reflections for a wide range of frequencies. This empirically found behavior is confirmed analytically here by perturbational calculations. Furthermore experimental and analytical resufts are given for a sphere located in the middle of the waveguide cross section. View full abstract»

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  • The Accuracy of TLM Analysis of Finned Rectangular Waveguides

    Publication Year: 1980 , Page(s): 743 - 746
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    This paper investigates three sources of error affecting the Transmission Line Matrix (TLM) analysis of finned rectangular waveguides. It is shown how truncation and velocity errors can be minimized, and a diagram for maximum coarseness error affecting the TLM analysis is presented. After error correction, cutoff frequencies obtained with the TLM method are in excellent agreement with results obtained with the Transverse Resonance Method. View full abstract»

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  • The Design of Linearizing Networks for High-Power Varactor-Tuned Frequency Modulators

    Publication Year: 1980 , Page(s): 767 - 773
    Cited by:  Papers (6)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1208 KB)  

    The problem of linearizing the tuning varactor of a microwave frequency rnodulator is still a hard one to solve, and actual designs must often be carried out by trial-and-error techniques. A possible systematic approach to the solution of this problem, taking advantage of modern computer-aided design methods, is presented in this paper. It is shown that a suitable use of a general-purpose optimization program makes it possible to find a tuning network providing both FM linearity and protection of the varactor junction against an excess of RF voltage. This is of considerable inportance in the case of medium- or high-power circuits, since the diode must then be prevented from being drawn into forward conduction or reverse breakdown for proper operation of the modulator. View full abstract»

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  • On the Propagation of Leaky Waves in a Longitudinally Slotted Rectangular Waveguide

    Publication Year: 1980 , Page(s): 714 - 718
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    The field theory approach is used to study leaky-wave propagation in a rectangular waveguide with long nonresonant slots in the narrow walls. Radiation from the slots is confined by parallel plates which act as transmission lines guiding the energy away from the slots. The complex dispersion equations for TE waves are examined and solved using an iterative numerical technique. Propagation characteristics both in the axial and transverse directions are presented, along with the electric field distribution and power flow. Restrictions on the analysis and on the power-handling capacity imposed by slot width also are described. Measurements of the phase characteristics of the dominant mode are in good agreement with theoretical values. View full abstract»

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  • Electric Probe Measurements on Microstrip

    Publication Year: 1980 , Page(s): 752 - 755
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (312 KB)  

    The aim of the experimental investigation reported here is to measure the electric field of microstrip using a field probe. To establish the accuracy of these measurements, the probe is first calibrated against a known field which is obtained by analyzing a wire suspended axially in a rectangular metal tube. Measurements on a simple wire over ground plane circuit indicate that unshielded structures are basically unsuitable for accurate probe calibration. Finally, the theoretical results predicted by a numerical analysis program for microstrip, published recently, are verified by comparing these with the actual field distribution determined experimentally. View full abstract»

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  • A Novel Polarization-Independent Beam Splitter

    Publication Year: 1980 , Page(s): 685 - 689
    Cited by:  Papers (3)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    This paper presents the design and experimental results of a novel broad-band quasi-optical polarization-independent beam splitter. The novel beam splitter consists of parallel metallic strips formed on a dielectric sheet. The width and spacing of the metallic strips and thickness of the dielectric sheet are optimized. This experimentally manufactured 3-dB beam splitter has a frequency bandwidth from 80 to 110 GHz, and the transmission and reflection coefficients for mutually orthogonal polarisation are within 3±0.5 dB over this entire frequency band. The insertion losses are 0.2 dB over the abovementioned frequency band. The obtained insertion losses are less than that obtained with any other quasi-optical polarisation-independent beam splitter presented in the literature to date. This type of beam splitter holds great promise as a device for constructing signal-multiplexing and demultiplexing circuits in the millimeter-wave region and above. View full abstract»

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  • A Low Phase Shift Step Attenuator Using p-i-n Diodes Switches

    Publication Year: 1980 , Page(s): 774 - 776
    Cited by:  Papers (6)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    A fast S-band MIC highdynamic ranqe (0+70 dB) step attenuator is described, with a very small phase change versus attenuation levels. To obtain this, three similar two-paths sections are cascaded, each being able, by means of a couple of SPDT p-i-n diodes switches, to attenuate 0 dB or, respectively, 10, 20, and 40 dB. Experimental results are given, referring to a circuit breadboard operating from 2 to 4 GHz, the phase change being less than ~11° over all the octave band. View full abstract»

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  • Spectral Domain Immitance Approach for Dispersion Characteristics of Generalized Printed Transmission Lines

    Publication Year: 1980 , Page(s): 733 - 736
    Cited by:  Papers (286)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    A simple method for formulating the dyadic Green's functions in the spectral domain is presented for generalized printed transmission Iines which contain several dielectric layers and conductors appearing at several dielectric interfaces. The method is based on the transverse equivalent transmission line for a spectral wave and on a simple coordinate transformation. This formulation process is so simple that often it is accomplished almost by inspection of the physical cross-sectional structure of the transmission line. The method is applied to a new versatile transmission line, a microstrip-slot Iine, and some numerical results are presented. View full abstract»

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  • Attenuation and Radiation Characteristics of the HE /Sub 11/ - Mode

    Publication Year: 1980 , Page(s): 704 - 710
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (624 KB)  

    The asymptotic properties of the fundamental mode HE 11 inside a large waveguide of finite surface impedances are discussed. The analysis applies to corrugated waveguides, certain optical fibers and wave-guides with metal walls coated by a dielectric layer. It is shown that for k-->∞ the HE 11 mode has the following two properties: it is polarized in one direction and the field vanishes at the boundary. Because of these properties, it is useful in the design of microwave feeds, since it minimizes cross-polarization and edge illumination at the aperture. It is also useful for long distance communication because of its low attenuation constant. Both the far field of a feed and the attenuation constant are discussed. It is shown that rectangular apertures have negligible cross-polarization over wider bandwidth than circular apertures. Furthermore, if the medium inside a waveguide is Iossless, so that power is lost only at the boundary, then the attenuation constant is very small, it is asymptotic to (ka)-2 for large ka, where k= 2 pi/lambda and a is a characteristic dimension of the waveguide. A rectangular waveguide consisting of four metal plates coated with thin dielectric layers is shown to be attractive for long distance communication, because of its simplicity of fabrication and its low attenuation. View full abstract»

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  • Method for Equalizing Phase Velocities of Coupled Microstrip Lines by Using Anisotropic Substrate

    Publication Year: 1980 , Page(s): 719 - 722
    Cited by:  Papers (30)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    We present a method for equalizing the even- and odd-mode phase velocities of coupled microstrip lines with zero-thickness strips by using the anisotropic material cut in the appropriate direction as the substrate. View full abstract»

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  • A General Equivalent Network of the Input Impedance of Symmetric Three-Port Circulators (Short Paper)

    Publication Year: 1980 , Page(s): 807 - 808
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (176 KB)  

    Starting from the network model of ferrite-filled resonators, a general equivalent network of the input impedance of symmetric, three-port circulators is given. The main advantage of the network, that it contains the original elements of the resonator model, so the physics of operation can be clearly seen and the results of field analysis can be directly used. View full abstract»

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  • A Quadriphase Fin-Line Modulator

    Publication Year: 1980 , Page(s): 747 - 752
    Cited by:  Papers (12)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (560 KB)  

    A hybrid-coupled quadriphase rnodulator which has been realized in fin-line technique is described. It operates over a 15-percent frequency band around 15 GHz with an insertion loss of 1.7 dB. The circuit has been scaled to twice the operating frequency. The insertion loss then amounts to 2.2 dB. Furthermore, it is shown experimentally that the performance of the modulator does not degrade if the dimensions of the waveguide housing are altered to amounts of up to 10 percent. View full abstract»

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  • Efficient Power Combining

    Publication Year: 1980 , Page(s): 755 - 762
    Cited by:  Papers (14)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (792 KB)  

    The objective of this paper is to establish understanding of the single/multimode oscillator circuits used in combiners. A model is developed with emphasis on the selection and realization of the input/output coefficients, optimum stabilizing and output loads, equalizing network synthesis, and other cogent features. The application of this theory to the highly successful and efficient design of J-band pulsed oscillators will be discussed. View full abstract»

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  • Transmission-Line Identities for a Class of Interconnected Coupled-Line Sections with Application to Adjustable Microstrip and Stripline Tuners

    Publication Year: 1980 , Page(s): 725 - 732
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (904 KB)  

    Transmission-line identities are developed for a class of interconnected coupled-line sections. The identities, which may be used in several applications, are employed to synthesize adjustable microstrip and stripline tuners consisting of parallel, coupled or uncoupled strips with movable bridging wires. The tuners, which are analogous to waveguide and coaxial-line multistub tuners, can be used, in principle, to match any impedance falling within the Smith Chart. An experiment on a 12-GHz adjustable microstrip tuner is described, and the results are found to agree favorably with the theory. 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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