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.

Equivalent-Circuit Analysis of a Broadband Printed Dipole With Adjusted Integrated Balun and an Array for Base Station Applications

Abstract: A printed dipole with an integrated balun features a broad operating bandwidth. The feed point of conventional balun structures is fixed at the top of the integrated balun, which makes it difficult to match to a 50-Omega feed. In this communication, we demonstrate that it is possible to directly match with the 50-Omega feed by adjusting the position of the feed point of the integrated balun. The printed dipole with the hereby presented adjustable integrated balun maintains the broadband performance and exhibits flexibility for the matching to different impedance values, which is extremely important for the design of antenna arrays since the mutual coupling between antenna elements commonly changes the input impedance of each single element. An equivalent-circuit analysis is presented for the understanding of the mechanism of the impedance match. An eight-element linear antenna array is designed as a benchmarking topology for broadband wireless base stations.

Ultrawide-band transitions and new microwave components using double-sided parallel-strip lines

Abstract: Double-sided parallel-strip lines have been used as a balanced transmission line to feed double-sided printed antennas or to fabricate microwave components such as balanced mixers. In this paper, ultrawide-band transitions from microstrip line to double-sided parallel-strip line are developed with 1-30-GHz bandwidth. New microwave components using double-sided parallel-strip lines are designed with good measured results. The double-sided parallel-strip line has an advantage of easy realization of low-impedance lines, which are important for many component designs.

Electromagnetic compatibility handbook

Abstract: EMI Sources Decibel and Approximations Electrical Length Fast Bode Magnitude Plotting Skin Depth, Wire Impedance, and Nonideal Resistors Nonideal Capacitors and Inductors Passive Filters Cable Modeling Transient Behaviour in the Time Domain Air Breakdown Transient Behaviour in the Frequency Domain Spectra of Periodic and Aperiodic Signals Transmission Lines and Matching Passive Contact Probes Inductance, Magnetic Coupling, and Transformers Magnetic Materials and a Few Devices Baluns and Balanced Circuits Cable Shielding and Crosstalk Radiated Emissions and Susceptibility Conducted Emissions and Susceptibility Plane Wave Shielding Electric Field Shielding Magnetic Field Shielding Additional Shielding Concepts Test Chambers Floating Metal and Guard Electrodes Electrostatic Discharge Grounding Circuit Board Layout for EMC Antenna Appendix A-Summary of the Three Major Coordinate Systems Appendix B-Definitions for Common and Uncommon Functions Appendix C-Conversion, Unit and Notation Tables Appendix D-Helpful Mathematical Relationships References

Ultrawideband Array With 70° Scanning Using FSS Superstrate

Abstract: We present a wideband tightly coupled dipole array (TCDA) with integrated balun and a novel superstrate consisting of printed frequency selective surface (FSS) for wide angle scanning. Although previous TCDAs have had decent scanning performance up to ±60°, use of dielectric superstrates are usually required, resulting in additional cost and fabrication complexity. In this paper, we replace the bulky dielectric layer(s) with periodic printed elements and yet achieve wide-angle and wideband impedance matching. The proposed approach provides superior performance of 6.1:1 bandwidth (0.5–3.1 GHz) with VSWR $E$ plane, ±70° in $D$ plane and ±60° in $H$ plane. The FSS, radiating dipoles and feed lines are designed and fabricated on the same vertically oriented printed circuit board, resulting in a low-cost and lightweight structure as compared to other low profile arrays. Measured scanning patterns of a $12 \times 12$ prototype are presented, showing good agreement with simulations.

The eleven antenna: a compact low-profile decade bandwidth dual polarized feed for reflector antennas

Abstract: A novel dual polarized ultrawide-band (UWB) feed with a decade bandwidth is presented for use in both single and dual reflector antennas. The feed has nearly constant beam width and 11 dBi directivity over at least a decade bandwidth. The feed gives an aperture efficiency of the reflector of 66% or better over a decade bandwidth when the subtended angle toward the sub or main reflector is about 53/spl deg/, and an overall efficiency better than 47% including mismatch. The return loss is better than 5 dB over a decade bandwidth. The calculated results have been verified with measurements on a linearly polarized lab model. The feed has no balun as it is intended to be integrated with an active 180/spl deg/ balun and receiver. The feed is referred to as the Eleven antenna because its basic configuration is two parallel dipoles 0.5 wavelengths apart and because it can be used over more than a decade bandwidth with 11 dBi directivity. We also believe that 11 dB return loss is achievable in the near future.