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Thesis_Final - NOVEL DESIGN OF A WIDEBAND RIBCAGE-DIPOLE...

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NOVEL DESIGN OF A WIDEBAND RIBCAGE-DIPOLE ARRAY AND ITS FEEDING NETWORK by Daniel D. Harty A Thesis Submitted to the Faculty of the WORCESTER POLYTECHNIC INSTITUTE in partial fulfillment of the requirements for the Degree of Master of Science in Electrical and Computer Engineering December 17 th , 2010 Approved by: ____________________ Sergey Makarov Thesis Co-Advisor ECE Department ____________________ Reinhold Ludwig Thesis Committee ECE Department ____________________ Francesca Scirè Scappuzzo Thesis Co-advisor Physical Sciences Inc. ____________________ Angelo Puzella Thesis Committee Raytheon Company
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i Abstract In this thesis the focus was on the design, fabrication, and tests of the feeding networks individually and within an array system. The array feeding network is a corporate-fed type utilizing equal-split, stepped-multiple sections of the conventional Wilkinson power divider in microstrip form with a unique topology. The feeding network was specifically designed for a broadside relatively small linearly-polarized wideband UHF non-scanning array for directed power applications that uses an array radiator with a new volumetric ribcage dipole configuration. The array has a large impedance bandwidth and consistent front lobe gain over the wide frequency band. Theoretical and experimental results describing the performance of the array feeding network and the array are presented and discussed.
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ii Acknowledgements I would like firstly to thank my family for supporting my education for many years both before and after I came to WPI, Prof. Sergey Makarov for countless academic and professional guidance, Dr. Francesca Sciré-Scappuzzo at Physical Sciences, Inc. for providing me this opportunity and supporting me all the way through, Prof. Reinhold Ludwig for his academic support, Mr. Angelo Puzella for his time and expertise, and Dr. Vishwanath Iyer for lots of encouragement and suggestions. Acknowledgment of Support and Disclaimer This material is based upon work supported by the United States Army and Physical Sciences Inc. (PSI) under Contract No. W15QKN-08-C-0493. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the United States Army or PSI.
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iii Table of Contents 1. Introduction ............................................................................................................................ 1 Part 1: .............................................................................................................................................. 3 Wilkinson divider design of an array corporate fed-network ......................................................... 3 2. Problem statement .................................................................................................................. 3 2.1. Goal .................................................................................................................................. 3 2.2. Approach .......................................................................................................................... 3 2.3. Expected results ................................................................................................................ 4 3. Introduction and background ................................................................................................. 5 3.1. Three-port networks ......................................................................................................... 5 3.2. Ideal network assumption ................................................................................................. 5 3.3. Passive three-port power dividers (advantages and disadvantages) ................................. 6 4. Wilkinson divider theory ........................................................................................................ 8 4.1. Transmission line circuit .................................................................................................. 8 4.2. Derivation of scattering parameters .................................................................................. 9 4.3. Figures of merit .............................................................................................................. 14 4.4. Frequency response of an equal-split divider ................................................................. 14 5. Microstrip design considerations ......................................................................................... 16 5.1. Topology ......................................................................................................................... 17 5.2. Higher-order modes ........................................................................................................ 19 5.3. Surface waves ................................................................................................................. 21 5.4. Losses ............................................................................................................................. 22 5.5. Power handling ............................................................................................................... 23 6. Numerical simulation ........................................................................................................... 25 6.1. 2:1 divider simulation results (straight design) ............................................................. 25 6.2. 2:1 divider simulation results (circular design) ............................................................. 30 6.3. Advantages of the circular topology 0.25λ TL se ction ................................................... 34 6.4. 4:1 divider simulation results
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