An analysis of the properties of a radiating aperture in an infinite conducting screen is made by expanding the field in terms of plane waves. Expressions for the far zone field, power flow, and energy stored in the reactive electric and magnetic fields are obtained. This enables the Q of the aperture to be evaluated. A theorem on the frequency sensitivity of the aperture susceptance (the rate of change of susceptance with frequency is proportional to the total energy stored in the reactive field) is proved. Finally a method of optimizing the aperture field to obtain, for example, maximum gain and minimum Q is developed. The method is based on an application of the sampling theorem and reduces the optimization problem to one of optimizing a polynomial function.
This final report was prepared by various staff members at COMSAT Laboratories. Most of the work under Task 1 has been performed by s. Rothschild and J. Thomas of the Communications Processing Laboratory (CPL). Mr. Rothschild provided the material in Subsections 2.2 and 2.3. J. McCoskey helped throughout the contract period in SATNET performance data analysis, C&M module checkout, and the development of the wideband timing simulation program. L. Mikisits also helped with the SATNET data summaries and prepared the compilations in Subsection 2.4. Dave Mills and Hoi Chong were the major participants in Task 2, Internetworking Experiments, throughout the contract period. The success of the NTC demonstration was largely due to their diligent efforts. Dr. Mills prepared the material in Section 3 and Appendices A and B. J. Kaiser has been involved in the ARPA program since fall 1979, first in helping with the logistics relative to the NTC demonstration, and recently in assuming the lead role in COMSAT'S coordination/integration of the wideband system. Ross Snider, who is on temporary assignment at COMSAT Laboratories, provided an independent assessment of the C&M capability and prepared Section 5 of this report. The contributions of all of these individuals during the past 15 months are acknowledged.
May 1983 (Class 84/1.03); filed in The Netherlands 2 April 1979This electronic music apparatus is of the type which adds to the automatic chord playing division of an electronic organ two control units which are scanned and controlled in the rhythm of the melody as it is played so that "in a certain rhythm the chords belonging to the bars of a certain melody may be produced by the organ itself, while then the player needs only play the melody." The patent mentions a variety of types of control units which could be used including electromechanical with sets of multi-position switches, sets of conductor matrices, melody music sheets, with circuits printed upon them, or programmable information bearers such as punched cards which can be processed by a reading device.--DWM
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