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  • 1
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    Input impedance of coaxially fed rectangular microstrip antenna on electrically thick substrate (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A full-wave spectral domain analysis has been used to obtain input-impedance results for a probe-fed rectangular-patch antenna, modeling the source as a magnetic-current frill. Multiple modes are used in the probe surface current to account for axial and azimuthal variations. It is established that maximum resistance is dependent on the substrate loss tangent. The axial variation of the probe current must be taken into account for substrate thicknesses greater than about 0.02 wavelengths.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Microwave and Optical Technology Letters (ISSN 0895-2477); 6; 6; p. 387-390.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mutual coupling between rectangular microstrip patch antennas (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The paper presents a comprehensive study of the mutual coupling between two rectangular microstrip patch antennas. The cavity model is employed to give numerical results for both mutual impedance and mutual coupling parameters for the E-plane, H-plane, diagonal, and perpendicular orientations. The effects of substrate thickness, substrate permittivity, and feed positions are discussed.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Microwave and Optical Technology Letters (ISSN 0895-2477); 5; 11, O; 572-576
    Format: text
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  • 3
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    Mutual coupling between electromagnetically coupled rectangular patch antennas (1991)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Measured mutual coupling between two X-band electromagnetically coupled rectangular patch antennas is reported. Results are given for both the wideband and high gain regions as well as for E-plane and H-plane couplings.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Electronics Letters (ISSN 0013-5194); 27; 532
    Format: text
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  • 4
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    Slotline fed microstrip antenna array modules (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A feed network comprised of a combination of coplanar waveguide and slot transmission line is described for use in an array module of four microstrip elements. Examples of the module incorporating such networks are presented as well as experimentally obtained impedance and radiation characteristics.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Microwave and Optical Technology Letters (ISSN 0895-2477); 1; 26-29
    Format: text
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  • 5
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    A 29.3-GHz cavity-enclosed aperture-coupled circular-patch antenna for microwave circuit integration (1991)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A circular patch antenna fed by an aperture-coupled microstrip line has been demonstrated at 29.3 GHz. The patch was enclosed by a cavity to reduce surface-wave interactions in an array environment and to improve heat dissipation when using active devices. The antenna exhibited a 2:1 input VSWR (voltage standing wave ratio) over a bandwidth of 12 percent from 27.52 to 30.95 GHz. The antenna should have applications in conformal phased arrays at millimeter-wave frequencies.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEEE Microwave and Guided Wave Letters (ISSN 1051-8207); 1; 170
    Format: text
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  • 6
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    Radiation characteristics of microstrip arrays with parasitic elements (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Detailed experimental results on microstrip antennas consisting of one center-fed patch and several identical parasitic patches are presented. The effects of the number of elements and interelement spacing are studied for two configurations: a linear array and a five-element array. It is shown that placing identical parasitic elements adjacent to a fed patch permits broadside radiation patterns with significant enhancement in gain to be obtained without any degradation of the pattern characteristics.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Electronics Letters (ISSN 0013-5194); 23; 835-837
    Format: text
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  • 7
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    New simple feed network for an array module of four microstrip elements (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A simple microstripline feed network for an array module comprising four microstrip elements is described. The advantages and disadvantages of the network are discussed as well as a theoretical explanation for the radiation characteristics of array modules using the network.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Electronics Letters (ISSN 0013-5194); 23; 436
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  • 8
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    Ka-band MMIC arrays for ACTS Aero Terminal Experiment (1992)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: An antenna system consisting of three experimental Ka-band active arrays using GaAs MMIC devices at each radiating element for electronic beam steering and distributed power amplification is presented. The MMIC arrays are to be demonstrated in the ACTS Aeronautical Terminal Experiment, planned for early 1994. The experiment is outlined, with emphasis on a description of the antenna system. Attention is given to the way in which proof-of-concept MMIC arrays featuring three different state-of-the-art approaches to Ka-band MMIC insertion are being incorporated into an experimental aircraft terminal for the demonstration of an aircraft-to-satellite link, providing a basis for follow-on MMIC array development.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IAF PAPER 92-0398
    Format: text
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  • 9
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    Swept frequency technique for dispersion measurement of microstrip lines (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Microstrip lines used in microwave integrated circuits are dispersive. Because a microstrip line is an open structure, the dispersion can not be derived with pure TEM, TE, or TM mode analysis. Dispersion analysis has commonly been done using a spectral domain approach, and dispersion measurement has been made with high Q microstrip ring resonators. Since the dispersion of a microstrip line is fully characterized by the frequency dependent phase velocity of the line, dispersion measurement of microstrip lines requires the measurement of the line wavelength as a function of frequency. In this paper, a swept frequency technique for dispersion measurement is described. The measurement was made using an automatic network analyzer with the microstrip line terminated in a short circuit. Experimental data for two microstrip lines on 10 and 30 mil Cuflon substrates were recorded over a frequency range of 2 to 20 GHz. Agreement with theoretical results computed by the spectral domain approach is good. Possible sources of error for the discrepancy are discussed.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-TM-88836 , E-3215 , NAS 1.15:88836
    Format: application/pdf
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  • 10
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    A vertically integrated Ka-band phased array antenna (1992)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The design, development, and experimental demonstration of a small phased array antenna suitable for applications on communications satellites are discussed. Each of the vertical layers was optimized for performance, and MMICs on custom carriers were characterized prior to insertion. A vertical integration architecture is used which minimizes the size of the array with its associated beamforming network (BFN). The antenna features a four-element linear microstrip array that uses aperture coupling of the antenna elements to the BFN; a modified Wilkinson power divider BFN; and 32 Ghz, 4-bit MMIC phase shifters on customized alumina carriers. Performance data are presented for all components, and far-field antenna radiation patterns are given.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: AIAA PAPER 92-1976
    Format: text
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