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Patent

Hybrid-balun for splitting/combining RF power

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TLDR
An in-phase hybrid and a balun in a single stage built with inexpensive coaxial cable which splits or combines RF power and simultaneously performs a balanced-to-unbalanced impedance transformation is described in this article.
Abstract
An in-phase hybrid and a balun in a single stage built with inexpensive coaxial cable which splits or combines RF power and simultaneously performs a balanced-to-unbalanced impedance transformation.

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Citations
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Dipole arrangements using dielectric substrates of meta-materials

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TL;DR: In this article, a transformation network is provided capable of interfacing between an unbalanced port (110) and a plurality of differently phased balanced ports (120, 130), where a balun (165) has a choke (140) and connects the unbalanced ports to a balanced pair of nodes.
References
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Patent

Microwave subharmonic mixer device

TL;DR: In this article, a wide band microwave subharmonic mixer includes a signal divider, first and second balanced varistor frequency converters, and a signal combining and dividing circuit.
Patent

Push-pull radio-frequency power splitter/combiner apparatus

TL;DR: In this paper, a push-pull 4-way power splitter/combiner is presented, where each of the balun and 2-to-1 transformers of the pushpull four-port apparatus can be fabricated of a magnetically-decoupled coaxial cable assembly.
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Broadband high frequency mixer

TL;DR: In this article, a broadband mixer has two separate tapered ground plane microstrip baluns associated with the first and second signal ports and two separate ground plane balun associated with a second signal port together with a frequency converter or mixer portion coupled between the baluns and a third signal port.
Journal ArticleDOI

A Wide-Band Parallel-Connected Balun

TL;DR: In this paper, it was shown that parallel-connected baluns (4:1 impedance transformation) have approximately four times the operating bandwidth of series-connected Baluns (1: 1 impedance transformation), and the theory of uncompensated resonant baluns is discussed, and design curves are presented which may be used to design any balun of this type.
Patent

Multi-stage power divider

TL;DR: A multi-stage power divider particularly adapted for use in microwave circuits consists of a plurality of transmission lines and resistances uniquely arranged to achieve a wide range of power division and to give the power dividers broad bandwidth and high isolation as discussed by the authors.