Design of compact folded-line RF power dividers Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1z40kw540

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  • Embedded passives in multi-layer media have gained importance for offering an attractive solution to the implementation of off-chip passive components in RF and mixed signal circuits, especially for wireless applications. Among the passive devices, power dividers and combiners are extensively used for a host of applications including balanced mixers, phase shifters, and feed networks in antenna arrays. The Wilkinson power divider is one of most popular types of power dividers, having ideal transmission characteristics at the center frequency and enabling simple realization in planar transmission line technology. For RF and mixed-signal applications, however, the conventional Wilkinson power divider has a prohibitively large component footprint due to its quarter-wavelength line components. To realize practical Wilkinson power dividers for RF applications, more compact designs with smaller footprint size are developed in this thesis. A more compact layout is obtained by folding the quarter-wavelength sections in the general multi-level, multi-conductor environment. A C-section with a single fold consisting of two coupled lines is introduced as basic building block. The folded-line concept in single- and multi-level configurations is applied to the design of new compact 3dB Wilkinson RF power dividers. Simple closed-form design equations for compact 3dB Wilkinson RF power dividers with single C-section and two cascaded C-sections are developed. A significant reduction in footprint between 67% and 83% of the conventional design is achieved. Comprehensive electromagnetic simulations with the full-wave planar electromagnetic simulator Momentum are performed for several typical compact designs to validate the proposed design methodology. Good agreement with the full-wave simulation results is demonstrated. For further validation, a compact single level 3dB power divider with two cascaded C-sections designed for 2 GHz center frequency has been fabricated. The measured response is found to be in good agreement with the theoretical response and full-wave simulation results.
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