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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TL;DR: In this article, the authors describe the design, fabrication, and testing of an Archimedean spiral or spiral antenna using polymer extrusion 3D printing of polycarbonate base material.
Abstract: This work describes the design, fabrication, and testing of an Archimedean spiral or spiral antenna using polymer extrusion 3D printing of polycarbonate base material. The spiral antenna design was simulated using CST Microwave Studio (R), and the resulting 3D printed antenna characterized in terms of return loss, directivity, and polarization. The antenna design was embedded into a 3D printed structure using a unique ultrasonic method while a ground plane was inserted through a thermal embedding process. These fabrication methods provide process flexibility, which allows multiple conductive antenna layers to be additively constructed in a single build sequence. The method described can be used to create unique electromagnetic structures such as waveguides directly in a 3D printed dielectric part. The spiral antenna was tested with three variations of microstrip feed line used to match 50 impedance and introduce a 180 degrees phase shift between the two arms of the spiral. These include a Duroid balun attached to feed of the antenna after fabrication, a Duroid balun embedded into the polycarbonate during fabrication, and the same microstrip design fabricated out of copper mesh and embedded into the structure using the polycarbonate as a dielectric substrate. The results of these three approaches will be discussed. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1662-1666, 2016
28 citations
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TL;DR: In this article, a new microstrip unbalanced-to-balanced (balun) diplexer based on stub-loaded dual-mode resonators is presented, which primarily consists of two balun filter channels, and both channels are entirely independently designable.
Abstract: A new microstrip unbalanced-to-balanced (balun) diplexer based on stub-loaded dual-mode resonators is presented. The proposed balun diplexer primarily consists of two balun filter channels, and both channels are entirely independently designable, thus bringing great flexibility in the balun diplexer design. Besides, owing to the direct connection of two dual-mode balun filters, no additional matching networks are demanded at the common input port, leading to a significant size reduction. For demonstration, a prototype balun diplexer operating at 2.30 and 2.72 GHz is implemented. Both simulated and experimental results are provided in good agreement.
28 citations
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TL;DR: In this paper, a family of balanced resistive HEMT mixers is presented, where the RF is fed through a 180/spl deg/ balun and the IF is extracted either by a 180 /spl deg / balun or single ended.
Abstract: A family of novel single device balanced resistive HEMT mixers has been designed and characterized. The RF is fed through a 180/spl deg/ balun. The IF is extracted either by a 180/spl deg/ balun or single ended. The main advantages of this type of mixer are that no device pairing is necessary, since only one HEMT is used and that no RF and LO grounding is necessary. These advantages make the described topology particularly suitable for microstrip MIC's, MMIC's, crossbar, fin-line and quasi optical mixers. The mixers are designed for RF 17.5-20 GHz, the LO is wideband and the IF is 1-2 GHz. Measurements show a conversion loss of 6 to 8 dB and an LO to RF isolation of up to 37 dB (typically 20 dB).
28 citations
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TL;DR: In this article, the gate-line termination of a distributed amplifier topology is used as the noninverting output and the inherent phase inversion property of the metal-semiconductor field-effect transistor (MESFET) to provide the antiphase output from the drain-line.
Abstract: The principles of the distributed amplifier are applied to realize wide-band monolithic distributed baluns. The technique reported here is based on using the gate-line "termination" of a distributed amplifier topology as the noninverting output and the inherent phase inversion property of the metal-semiconductor field-effect transistor (MESFET) to provide the antiphase output from the drain-line. Closed-form expressions are derived for the two output voltage signals and their respective power gains. The theoretical performance of the balun is then examined as a function of the important MESFET parameters and other circuit parameters. Some practical design considerations are given followed by the measured results of two monolithic prototypes. The first is a basic two-section balun, while the second employs a four-section balun with a three-stage positive gain slope preamplifier to compensate for the increase in gate-line loss with frequency. Balun operation over 0.5-20 GHz and 0.5-12 GHz has been demonstrated for the two-section and four-section balun, respectively.
28 citations
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TL;DR: An ultrawideband, tightly coupled balanced antipodal dipole array (TC-BADA) with low cross-polarization characteristic is presented in this paper, where the antenna elements are fed by a tapered balun with six pairs of vias placed at the balun edges.
Abstract: An ultrawideband, tightly coupled balanced antipodal dipole array (TC-BADA) with low cross-polarization characteristic is presented. The proposed array achieves a low cross-polarization level by printing a pair of tightly coupled antipodal dipoles on two substrates to form a balanced radiating structure. The antenna elements are fed by a tapered balun with six pairs of vias placed at the balun edges. A meta-surface-based wideangle impedance matching (MS-WAIM) layer is designed based on the equivalent circuit model and current distribution, which improves the beam scanning ability and reduces the antenna profile simultaneously. The simulated results show that the proposed TC-BADA is able to operate over a 5:1 bandwidth (2.05–10.3 GHz) with active VSWR $0.51\lambda _{\mathrm {H}}$ at the highest operating frequency. A prototype of $16 \times 16$ array is fabricated and the central 8 $\times $ 8 elements are measured. Good agreement is achieved between the simulated and measured results.
28 citations