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.
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Patent•
03 Feb 1998
TL;DR: In this paper, a thin surface mounting type balun transformer with a small area was proposed, where the inside terminals of the spiral inductors were connected with ground electrodes layers 19 and 19 of ground sheets 18 and 18 which were arranged at the outermost sides.
Abstract: PROBLEM TO BE SOLVED: To provide a thin surface mounting type balun transformer with a small area. SOLUTION: Primary dielectric sheets 5a and 5b carrying single spiral inductors L1 and L2 constituting primary balun lines are laminated at the upper and lower parts of a connecting sheet 2, in which an unbalanced terminal 4 is formed, and secondary dielectric sheets 13a and 13b carrying single spiral inductors L3 and L4 which constitute secondary balun lines are circumscribed at the outside parts. The inside terminals of the spiral inductors L3 and L4 are connected with ground electrodes layers 19 and 19 of ground sheets 18 and 18 which are arranged at the outermost sides. Thus, a thin surface mounting type balun transformer with a small area can be obtained.
16 citations
Patent•
10 Dec 2003TL;DR: In this paper, a mode-switching transformer selective on a band centered on a first frequency, comprising, between a same common mode input/output terminal and respectively one of two differential mode inputs/output terminals, a high-pass filter with a cut-off frequency smaller than the first frequency and a band-pass filtering with a central frequency greater than said first frequency is presented.
Abstract: A mode-switching transformer selective on a band centered on a first frequency, comprising, between a same common mode input/output terminal and respectively one of two differential mode input/output terminals, a high-pass filter with a cut-off frequency smaller than said first frequency, a band-pass filter with a central frequency greater than said first frequency.
16 citations
Patent•
21 Jan 2004TL;DR: In this article, a system and method for decoupling coils in a medical imaging system is described, which includes a first coil, a second coil, and a balun device.
Abstract: A system and method for decoupling coils in a medical imaging system are provided. The coil system includes a first coil of a medical imaging system, a second coil of the medical imaging system, and a balun device connected to the first and second coils. The balun device is configured to decouple the first and second coils of the medical imaging system.
16 citations
TL;DR: In this article, a new design method for an asymmetric microstrip-to-coplanar stripline (CPS) transition based on the analytical electromagnetic model is presented, where the cross section at each stage of the transition is analyzed through conformal transformation, and the corresponding line impedance is calculated.
Abstract: A new design method for an asymmetric microstrip-to-coplanar stripline (CPS) transition based on the analytical electromagnetic model is presented. The cross section at each stage of the transition is analyzed through conformal transformation, and the corresponding line impedance is calculated. Then, the ground linewidth on the substrate bottom is adjusted to form an optimal Klopfenstein impedance taper. To demonstrate the design method, a transition between a 50- $\Omega $ microstrip line and a high-impedance CPS line ( $147~\Omega$ ) was implemented. Good transition performance with more than 10-dB return loss and less than 1-dB insertion loss was obtained for frequency ranges of 6–40 GHz.
16 citations
TL;DR: In this article, a planar microstrip balun with two operation bands is presented and investigated on a symmetrical four-port network with one short-circuited port.
Abstract: A new planar microstrip balun with two operation bands is presented and investigated in this letter. Originated from the traditional Marchand balun, the proposed dual-band balun is designed on a symmetrical four-port network with one short-circuited port. Derived equations and design charts show that the frequency ratio ( $m = f_{2}/f_{1}$ ) of these two bands could be flexibly controlled in a wide range of 2.0–4.6. Moreover, inherent transmission zeros nearby each band have been introduced into this dual-band balun, aiming to improve the frequency selectivity. For verification, a prototype dual-band balun operating at 2.4 and 5.2 GHz ( $m = 2.17$ ) is implemented and measured. Both simulation and measured results are recorded with good agreement.
16 citations