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Typical directional couplers are based on quarter-wavelength transmission line segments. Such designs are physically too large for most integrated system-in-package applications. A lumped-element circuit for electrically short, narrow-band directional couplers is described and analyzed. This circuit is much smaller and is better suited for integrated assemblies. Its directivity is shown to derive...
Coupled-resonator baluns consist of a pair of LC resonators that are coupled by mutual inductance. They are usually designed using circuit optimization methods, but this optimization is highly constrained by limitations in the implementing technology and restrictions on size and cost. However, by tuning the capacitors in each resonator, acceptably good designs can be realized over a wide range of...
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