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Microwave Theory and Techniques, IEEE Transactions on

Issue 7 • Date Jul. 1971

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Displaying Results 1 - 25 of 25
  • [Front cover - July 1971]

    Page(s): f1 - f2
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    Freely Available from IEEE
  • Introductory Remarks, July 1971

    Page(s): 569
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    Freely Available from IEEE
  • Modes in the Shielded Microstrip on a Ferrite Substrate Transversely Magnetized in the Plane of the Substrate

    Page(s): 570 - 577
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    The shielded microstrip on a ferrite substrate transversely magnetized in the plane of the substrate is analyzed using an appropriate modal expansion in each of the two media. The boundary conditions at the interface are then expressed in terms of two coupled integral equations which are subsequently solved by the method of moments. Information on the singularities in the fields near the edges is used in the computations to obtain the eigenvalue /spl beta/ within an estimated 0.5-percent accuracy using matrices as small as 5x5. Comparison with various published results for the microstrip is made in the lid case of a dielectric substrate. An/spl omega/-/spl beta/ plot is presented for one particular ferrite-loaded configuration which shows slight non-reciprocity in both the fundamental and higher order modes. View full abstract»

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  • Ferrimagnetic Parts for Microwave Integrated Circuits

    Page(s): 577 - 588
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    Tremendous technological strides have been made in recent years in the development of miniaturized microwave components and modules using microstrip transmission lines in combination with both semiconductor and ferrite technology. This technology growth has been spurred by rapidly increasing microwave systems complexity and diversity and the need for lower cost, more reliable, and smaller microwave assemblies. This paper describes the design and performance of various ferrimagnetic components as functional blocks for use in microwave integrated modules. The design and performance of the following components are described as well as their utilization in various multifunction modules: junction circulators both fixed bias and latching including their use as isolators, duplexers, switches, modulators, and other signal processing circuits; ferrimagnetic planar phase shifters; various combinations of these circuit elements where both all ferrimagnetic and composite ferrimagnetic/dielectric substrates are utilized. View full abstract»

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  • Status of Lumped Elements in Microwave Integrated Circuits - Present and Future

    Page(s): 588 - 599
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    The use of lumped elements in microwave integrated circuits (MICS) is discussed. The design, fabrication, and performance of networks used in both active and passive circuits are described. Studies on amplifier impedance matching and transforming networks have resulted in the achievement of a 35-dB-gain 6-W-CW 26-percent-efficient amplifier at 2.25 GHz using only lumped elements. Construction of lumped-element low-pass filters and 3-dB quadrature hybrids at S band have produced circuits much smaller than, but with performance comparable to, microstrip distributed circuits. At C band a large-impedance transformer operating as a filter had less than 0.4-dB loss for an impedance transformation close to 20:1. The performance of lumped-element circuits through X band is compared with that of distributed circuits from the standpoint of size, economy, and technological applications. Lumped-element circuits are competitive with distributed circuits through 6 GHz and are practical through 12 GHz. View full abstract»

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  • Integrated X-band Sweeping Superheterodyne Receiver

    Page(s): 600 - 609
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    The development of an integrated low-noise sweeping superheterodyne receiver is described. Based upon a receiver performance tradeoff study, a group of components were designed and integrated within a single housing occupying 5.9 in/sup 3/, less connectors. The integrated receiver weighs 6.4 oz, including magnets, and contains the following components: a wide-band low-noise tunnel-diode amplifer (TDA), an image-rejection balanced mixer, a varactor-tuned Gunn oscillator, a four-stage IF amplifier, and a quasi-complementary IF output filter. The housing also contains an interstage ferrite isolator, a bias distribution network with subminiature potentiometers, and a branch-line coupler. This coupler permits the injection of an external oscillator and allows the system to be evaluated outside the band covered by the internal Gunn oscillator. This receiver is the first kind to integrate within a minimum volume all the components necessary for a wide-band low-noise rapid-scan X-band imageless superheterodyne receiver. Varactor tuning permitted the entire receiver to be integrated in a package having about one fifth the weight and two fifths the volume of other similar receiver designs (e.g., a receiver utilizing a YIG-tuned oscillator). View full abstract»

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  • Product Design of a High-Power S-Band MIC Module for Phased Arrays

    Page(s): 609 - 616
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    The mechanical and electrical design of a 10-W S-band hybrid microwave integrated circuit (MIC) module is described. The module uses transistor chips mounted on a carrier designed for stripline applications. Seventeen units were constructed and representative test data are presented. Phase matching of /spl plus mn/ 15/spl deg/ was obtained between a group of modules by use of compensating lengths of lines attached to the outputs. View full abstract»

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  • An Array of Pulsed X-Band Microstrip Gunn Diode Transmitters with Temperature Stabilization

    Page(s): 616 - 622
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    The construction of pulsed microstrip Gunn diode transmitters which deliver 5-10 W at 9.4 GHz is described. The oscillators are designed to be used as injection locked elements in a simple phased array system; the necessary phase stability against ambient and in-pulse temperature change being achieved by suitably biasing a varactor diode. Details of the design and performance of the transmitter and its component parts are presented together with preliminary data on a small array. View full abstract»

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  • An L-Band MIC Front End for an IFF Receiver

    Page(s): 622 - 627
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    A microwave integrated circuit (MIC) front end which satisfies stringent environmental and filtering requirements has been developed; the design objectives were based on the requirements typical of an L-band receiver for an identification friend or foe (IFF) transponder. The front end includes a preselector, a balanced mixer, and a multiplier for providing the local oscillator (LO) signal. A compact low-loss design has been achieved for the bandpass filter portion of the preselector through the use of "hairpin" resonators. Use of a semilumped 3-dB coupler has resulted in a significant reduction in the size of the mixer. The front-end noise figure was measured to be 10.4 dB at room temperature, with a maximum of 14.0 dB at 125/spl deg/C. All spurious responses were measured to be more than 80 dB down, and LO reradiation was -67 dBm. Dynamic range was greater than 70 dB. View full abstract»

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  • Ku-Band Electronically Tunable Monopulse Receiver

    Page(s): 627 - 633
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    Techniques employed for Ku-band hybrid integrated microstrip components are discussed along with their performance data. The final integration results in a complete monopulse receiver with its own electronically tunable Gunn oscillator in a total packaged volume of 2.1 in/sup 3/. Materials and their limitations are discussed. Electronically tunable Gunn oscillator performance at Ku band is demonstrated which leads finally to a brief discussion of the dynamic impedance properties of negative resistance diodes. View full abstract»

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  • 4-GHz Integrated-Circuit Mixer

    Page(s): 634 - 637
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    We have calculated the conversion loss for microwave diode mixers taking into account the effects of series resistance and barrier capacitance in the diode and the internal resistance of the local oscillator. The relations between the conversion loss and the parameters, which are important for the design of the diode mixer, are clarified. A 4-GHz integrated-circuit low-noise mixer is developed. The minimum overall noise figure obtained is 4.1 dB with a short-circuited image-frequency termination. View full abstract»

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  • A 20-GHz Integrated Balanced Mixer

    Page(s): 638 - 643
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    An integrated balanced mixer for use in the receiver for the quasi-millimeter-wave digital radio transmission system is described. The following aspects of the mixer realization are discussed. 1) The characteristics of gallium arsenide Schottky barrier diodes and three types of diode mount construction are described. The least observed dc incremental conversion loss was about 4 dB in the range of 18-23 GHz. 2) The fabrication of waveguide to microstrip transition, using a ridged waveguide transducer, is described. A transition loss of less than 0.38 dB was obtained in the range of 18-21.75 GHz. 3) The microstrip circuit elements, such as the 3-dB directional coupler and the low-pass filter, are described. The minimum isolation and coupling values of the coupler were about 16 dB and 3-4 dB, respectively. 4) The effect of the undesirable electromagnetic mode propagation on the integrated mixer operations is discussed. 5) The performance of the integrated balanced mixer is presented. This mixer, operated at a signal frequency of 20 /spl plus mn/0.5 GHz and at a local oscillator frequency of 18.3 GHz, showed a single side-band noise figure of 4.8-5.8 dB. 6) The reliability of the mixer is also evaluated with high reliability under vibration and shock testing being exhibited. View full abstract»

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  • Dielectric Resonator Filters for Application in Microwave Integrated Circuits

    Page(s): 643 - 652
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    Design of bandpass filters for microwave integrated circuits (MICS) utilizing dielectric resonators is discussed. Synthesis methods for both Tschebycheff and Butterworth responses are derived. Experimental results with S- and X-band filters are presented, and the agreement between theory and experiments is shown to be fairly good. Limitations on this technique due to poor temperature stability are also discussed. View full abstract»

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  • Trimming of Microstrip Circuits Utilizing Microcantilever Air Gaps (Correspondence)

    Page(s): 652 - 654
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    A reliable method of tuning and microwave integrated circuit (MIC) line connection which has potential up to X band has been demonstrated. The method utilizes integrable fabricated microcantilever air gaps which are cold-deformed in situ to accomplish trimming. The advantages of this concept are 1) high open-circuit impedance, 2) low short-circuit insertion loss, 3) high trim resolution, 4) low line perturbation, 5) high mechanical stability, and 6) in situ fabrication with the rest of MIC circuitry. View full abstract»

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  • A 90-dB Microstrip Switch on a Plastic Substrate (Correspondence)

    Page(s): 654 - 657
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    A single-pole double-throw (SPDT) microstrip switch has been designed on a plastic (polyolefin) substrate to switch two 10-W CW carriers into a common load over the frequency range 1.7 to 2.3 GHz. No tuning adjustments are used over this 30-percent bandwidth to obtain a 90-dB minimum isolation, a 23-dB minimum return loss, and a 1-dB maximum insertion loss. Units now in production typically have a 0.6-dB insertion loss, a 26-dB return loss, and isolation levels of 105/spl plus mn/5 dB. View full abstract»

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  • Octave Bandwidth Adjustable SPDT Power Switch Using p-i-n Diode-Terminated Stubs (Correspondence)

    Page(s): 657 - 659
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    A new two-diode single-pole double-throw (SPDT) power-switch with the operating frequency adjustable within one octave is presented. An experimental model of the switch showed frequency adjustments in narrow bandwidth operation between 0.65 and 1.3 GHz. Frequency adjustment is made by appropriately short-circuiting a transmission line. Using thin-film microstrip lines, the switch was buitt on a 50-mil-thick 1-in by 1-in A1/sub 2/O/sub 3/ ceramic substrate. Switching speed is 100 to 300 ns; power handling capability is 1.5-kW peak power at 1-percent duty factor. View full abstract»

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  • A Wide-Band Quadrature Hybrid Coupler (Correspondence)

    Page(s): 660 - 661
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    Wide-band quadrature hybrid proximity couplers consist of a conductor fabricated by thin-film techniques in microstrip the conductor side and a slot in the ground plane side. A 4 to 1 bandwidth was achieved using an alumina substrate of 99.6-percent purity with a surface finish of 10 /spl mu/in. A single-section quadrature hybrid has been fabricated and operates over a 2.5- to 10-GHz frequency range with a maximum VSWR of 1.43:1, a 20-dB typical isolation, and a phase difference between outputs of 90/spl deg/ /spl plus mn/ 3/spl deg/. View full abstract»

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  • An Integrated Microstrip Circulator (Correspondence)

    Page(s): 661 - 662
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    Ferrite circulators, incorporated as integral parts of a microstrip circuit on a copper-clad dielectric substrate, have been developed and tested. These circulators do not require the machining of a hole in the dielectric substrate or etching of the ferrite metalization. 20-dB isolation bandwidths of 3.5 to 4 percent in the frequency range 1.75 to 2.23 GHz were measured. View full abstract»

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  • A 30-GHz Inverted-Microstrip Circulator (Correspondence)

    Page(s): 662 - 664
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    A 3-port inverted-microstrip circulator has been built which operates near 30 GHz with an isolation of greater than 20 dB over a 6-percent bandwidth. The circulator junction has an insertion loss of less than 0.4 dB over the band exclusive of losses in transitions used for testing the device. View full abstract»

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  • A Simple Technique for the Accurate Determination of the Microwave Dielectric Constant for Microwave Integrated Circuit Substrates (Correspondence)

    Page(s): 664 - 665
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    A method of determining the microwave dielectric constant of microwave integrated circuit substrates is described. The technique is especially suitable to substrates being prepared for MICs since they are, in general, regular, rectangular, and, therefore, simple resonators. The dielectric constant using this technique has been determined in the 2- to 12-GHz range for GaAs (/spl epsiv/R = 12.46), sapphire (/spl epsiv/R =9.37), polyguide (/spl epsiv/ =2.33), and Alsimag 772 (/spl epsiv/R = 10.08). View full abstract»

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  • Resonant Frequency Calculations for Microstrip Cavities (Correspondence)

    Page(s): 665 - 666
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    Microstrip circuits in metal enclosures frequently exhibit loss spikes. These spikes are sometimes shown to be related to cavity resonances whose frequency can be calculated from enclosure dimensions using known theory. These calculations are presented graphically so that resonant frequencies may be determined for a particular structure or resonances within a band avoided through judicious choice of enclosure dimensions. Comparison of experimental and calculated results are tabulated. View full abstract»

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  • The Razor Search Program (Computer Program Descriptions)

    Page(s): 667
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    The razor search program is a package of subroutines which locates the minimum of a function of several variables by the razor search method of Bandler and Macdonald. View full abstract»

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  • Freely Available from IEEE
  • Information on computer program descriptions

    Page(s): 672
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    Freely Available from IEEE
  • [Back cover]

    Page(s): b1 - b2
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    Freely Available from IEEE

Aims & Scope

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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