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
More filters
Patent•
04 May 2006TL;DR: In this paper, a filter-balun combination for filtering an RF input signal and balancing output RF signals is provided, which is formed in a multi-layer planar substrate having multiple dielectric layers and multiple planar device layers having conducting material.
Abstract: A filter-balun combination for filtering an RF input signal and balancing output RF signals is provided. The filter-balun combination is formed in a multi-layer planar substrate having multiple dielectric layers and multiple planar device layers having conducting material. The filter section includes first and second symmetrical inductors formed in the substrate. The inductors provide filtering for an input signal. The balun section includes a balun central transmission line connected to an output of the filter, and two output structures for providing the output from the filter-balun combination. The central transmission line follows a path through the substrate that includes first and second coil areas. The input line is sandwiched between upper and lower transmission lines in the first and second coil areas. The output of the filter-balun combination is a filtered, balanced signal at each of the two balun output structures.
17 citations
TL;DR: In this paper, an ultra-wideband, dielectric-immersed antenna was developed for a breast tumor detection system, where the antenna is a tapered slotline that operates in a low permittivity Dielectric.
Abstract: An ultra-wideband, dielectric-immersed antenna has been developed for a breast tumor detection system. The antenna is a tapered slotline that operates in a low permittivity dielectric. The sensor is fed by an ultra-wideband microstrip-to-slotline balun. Simulations of the balun and the tapered profile demonstrate that reflection coefficient bandwidth of each structure spans 2–12 GHz. The antenna and balun are implemented with a photolithography process, and good agreement is obtained between simulated and measured results for the entire structure. To evaluate the suitability of the antenna for the intended application, measurements are performed with a variety of objects placed in a homogeneous background. Detection and location of the objects are explored. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 633–638, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24112
17 citations
TL;DR: In this paper, a hybrid cavity-microstrip structure is proposed to obtain high selectivity passband response, magnitude imbalance of 0.075 dB, and phase difference of 180° ± 0.2°.
Abstract: Filtering baluns are proposed based on the hybrid cavity-microstrip structures in this article. The cavity acts as the resonator to obtain the filtering response. In the meanwhile, the microstrip feeding networks are used to excite multiple modes and achieve the balun characteristics simultaneously. The coupling mechanism between the slots and the cavities is utilized to analyze the single- and dual-band filtering baluns. Therefore, by combining the benefits of the cavities and the microstrip lines, multifunctional filtering baluns are realized. Besides, to reduce the volume and insertion loss further, a filtering balun based on the dielectric cavity-microstrip structure is presented and designed. It possesses high selectivity passband response, magnitude imbalance of 0.075 dB, and phase difference of 180° ± 0.2°. It is much smaller than that fed by the waveguide. On the other hand, it is easy to integrate with other components and robust in structure compared to that fed by the probe. Thus, the proposed hybrid structure not only maintains the high performance of the cavity but also has the flexibility of the planar circuit.
17 citations
Patent•
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TL;DR: In this paper, a mixer including a "reflection" transmission line transformer having at least first and second ports is considered. But the proposed approach requires that the ports are connected such that nearly complete coupling of energy between the ports relies on substantially complete reflection of energy at a reference plane of the transformer.
Abstract: A mixer including a "reflection" transmission line transformer having at least first and second ports. The ports are connected such that nearly complete coupling of energy between the ports relies on substantially complete reflection of energy at a reference plane of the transformer. In a preferred implementation there is produced at the first port an intermediate frequency (IF) signal and received a DC bias signal via an IF balun. At the second port there is inputted a radio frequency (RF) signal through an RF balun. The DC bias signal will preferably be provided to a set of phase-selecting GaAs MESFET transistors operatively connected between an LO balun and a third port of the reflection transformer. In the preferred implementation the MESFET transistors are realized using an MMIC.
17 citations
Patent•
12 Jun 2008TL;DR: In this article, a balun comprises at least two asymmetric coplanar striplines, one coupled to a signal input and the other coupled to the output of a signal output.
Abstract: A balun comprises at least two asymmetric coplanar striplines, a first of the striplines coupled to a signal input, and a second of the striplines coupled to a signal output, the at least two asymmetric coplanar striplines configured in a Marchand architecture to receive an unbalanced signal and to output a balanced signal.
17 citations