Topic
Balun
About: Balun is a research topic. Over the lifetime, 5375 publications have been published within this topic receiving 52256 citations. The topic is also known as: Telephone balance unit.
Papers published on a yearly basis
Papers
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08 Sep 1997TL;DR: In this article, a phase modulator having a Gilbert cell mixer was used in frequency ranges from a microwave frequency band of several GHz to a millimeter wave band of many 10 GHz.
Abstract: A phase modulator having a Gilbert cell mixer can be used in frequency ranges from a microwave frequency band of several GHz to a millimeter wave band of several 10 GHz. Two output signals Vout1, Vout2 from the Gilbert cell mixer are supplied to balanced input terminals of a balanced-to-unbalanced converter, which produces a phase-modulated output signal Vout from an unbalanced output terminal thereof. Even when a differential amplifier comprising FETs Q1, Q3 and a differential amplifier comprising FETs Q2, Q4 do not operate symmetrically, the phase modulator generates phase-modulated output signals that have the same amplitude as each other and are in opposite phase to each other. With the Gilbert cell mixer comprising FETs, the phase modulator can be used in the frequency ranges described above. If the balanced-to-unbalanced converter is in the form of a planar circuit, then the phase modulator may be implemented by an MMIC.
72 citations
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04 Aug 1999TL;DR: A balanced/unbalanced transformer has at least one pair of stacked coupled spiral lines with the spiral lines formed on different levels of the device with the upper spiral line nested between the lower spiral line as mentioned in this paper.
Abstract: A balanced/unbalanced (balun) transformer has at least one pair of stacked coupled spiral lines. The spiral lines are formed on different levels of the device with the upper spiral line nested between the lower spiral line. This structure allows the width W and spacing S of the lines to be independently varied. Analysis of devices made with this configuration shows an optimum ratio of W to W+S of from 0.4 to 0.6.
72 citations
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TL;DR: In this paper, a planar, wideband feed for a slot spiral antenna is presented and tested at VHF frequencies, which is more attractive for conformal applications than most traditional printed spiral antenna designs.
Abstract: A new planar, wideband feed for a slot spiral antenna is presented and tested at VHF frequencies. Radiation pattern measurements are presented to demonstrate the performance and usefulness of this feed. In contrast to most traditional printed spiral antenna designs, the one presented here incorporates a completely planar balun and feed, making it more attractive for conformal applications.
72 citations
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13 May 2004TL;DR: In this article, a transformer balun is obtained that is symmetrical in structure, provides high current, or high voltage, amplification and has high coupling coefficients while maintaining minimal overall size.
Abstract: A transformer balun is obtained that is symmetrical in structure, provides high current, or high voltage, amplification and has high coupling coefficients while maintaining minimal overall size. The balun structure includes primary and secondary metal windings at separate layer interfaces. The primary and secondary metal windings are symmetrical and can have any number of turns, which is only limited by integrated circuit area and capacitance. Accordingly, the, primary and secondary windings may be on as many layers as needed. Further, the primary and/or secondary may include a center tap ground, which enables the winding to be used as a differential port.
72 citations
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TL;DR: A scaling principle is derived for the exponential tapering of the antenna, and a closed-form model for the current distribution is provided, and such theoretical results are in good agreement with several numerical simulations performed by using the NEC2 code.
Abstract: The geometrical and electrical features of the Vivaldi antenna are studied in the light of the frequency-independent antenna theory. A scaling principle is derived for the exponential tapering of the antenna, and a closed-form model for the current distribution is provided. Such theoretical results are in good agreement with several numerical simulations performed by using the NEC2 code. Furthermore, a practical feeding system, based on a double-Y balun, is developed and tested to obtain a more systematic approach to the design of the aforesaid antennas
71 citations