The monograph focuses on the design of complex microwave networks with the use of broadband coupled-line directional couplers. Three different areas of the design and application of such couplers have been addressed, which are:
1. Design of coupled-line impedance transforming directional couplers.
2. Design of broadband Butler matrieces utilizing coupled-line directional couplers.
3. Design of miniaturized directional couplers with the use of quazi-lumped-element technique.
All aspects have been comprehensively researched by the Author over the recent years. In particular, the application of asymmetric coupled-line directional couplers in balanced and n-way power amplifiers has been described, and the design of such circuits has been shown with the emphasis on their impedance transforming capability. The major advantage of the proposed approach is that it allows to realize both power dividing and impedance matching within a single component. Single-section and multisection impedance transforming directional couplers are analyzed and the achievable impedance transformation ratio for such couplers is derived.
The second issue presented in the monograph concerns the design of broadband Butler matrices. A method for the design of broadband Butler matrices utilizing coupled-line directional couplers is presented, in which multisection symmetrical coupled-line directional couplers are used. The method proposed by the Author of broadband differential phase shifters’ realization for applications in such networks, is outlined. It is shown, that the design of broadband Butler matrices with the use of multisection directional couplers requires applying of Schiffman ‘C’-sections in order to minimize the phase imbalance of the resulting network. Moreover, a novel arrangement of an 8 × 8 Butler matrix is proposed, that allows for planar fully integrated realization.
Finally, the design method of miniaturized broadband directional couplers, developed by the Author, is described, in which a quasi-lumped-element technique is used.
The proposed approach allows for achieving the frequency response of miniaturized 7/ couplers comparable to the response of their distributed counterparts. Moreover, the method allows for achieving broad bandwidths, due to its suitability for the design of multisection miniaturized directional couplers. The presented theoretical analyses have been confirmed by the measurements of a number of manufactured coupled-line networks.
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