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Fractal-Shaped Balun Using Composite Right/Left-Handed Transmission Line for Bandwidth Enhancement

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Published/Copyright: August 25, 2011
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Frequenz
From the journal Volume 65 Issue 5-6

Abstract

This article presents a fractal-shaped broadband balun based on the lumped-element composite right/left-handed transmission line (CRLH TL). The developed balun involved there –90° Koch-shaped microstrip branches and one +90° CRLH branch, features compact, excellent transmission performance and bandwidth enhancement. Closedform formulae for broadband strategy and general guide lines for fractal implementation are derived. For verification, a balun operated at 1.5 GHz is designed, fabricated and measured. Consistent results between simulation and measurement has validated this concept as well as the developed equations. The fabricated balun, with an occupied area of 17.7 × 24.8 mm2 corresponding to 12% of the area that its conventional counterpart occupies, exhibits a relative bandwidth of 93.3% ranging from 1.03 to 2.43 GHz. Across this frequency region, the return loss is better than 10 dB while the amplitude and phase imbalance varies within 1 dB and 4.2° respectively.

Keywords.: Fractals; composite right/left-handed transmission line (CRLH TL); balun; broadband; miniaturization
Corresponding author: He-Xiu Xu, Department of Electromagnetic Field & Microwave Technique, Missile Institute of Air Force Engineering University, Sanyuan county – 713800, China.
Received: 2011-03-22
Published Online: 2011-08-25
Published in Print: 2011-July

Copyright © 2011 De Gruyter

Articles in the same Issue

  1. Fractal-Shaped Balun Using Composite Right/Left-Handed Transmission Line for Bandwidth Enhancement
  2. Design of Compact Low Pass Microstrip Filter For Wireless Communication System
  3. A Compact and Broadband Chip-Resistor Loaded Circularly Polarized Microstrip Antenna
  4. A Low Power Multi-Modulus Programmable Divider with TSPC Technology
  5. Numerical Simulation of Single-anode and Double-anode Magnetron Injection Guns for 127.5 GHz 1 MW Gyrotron
  6. SINR Analysis of Hexagonal Multicarrier Transmission Systems in the Presence of Insufficient Synchronization for Doubly Dispersive Channel
  7. Performance Analysis of Opportunistic and Incremental Relaying Coded Cooperation: Impact of Exchange Ratio
  8. A Stacked Microstrip Patch Antenna Loaded With U-Shaped Slots
  9. 8th International Workshop on Intelligent Transportation (WIT 2011), Hotel Hafen Hamburg, 22. und 23. März 2011
https://doi.org/10.1515/freq.2011.019
Keywords for this article
Fractals; composite right/left-handed transmission line (CRLH TL); balun; broadband; miniaturization

Articles in the same Issue

  1. Fractal-Shaped Balun Using Composite Right/Left-Handed Transmission Line for Bandwidth Enhancement
  2. Design of Compact Low Pass Microstrip Filter For Wireless Communication System
  3. A Compact and Broadband Chip-Resistor Loaded Circularly Polarized Microstrip Antenna
  4. A Low Power Multi-Modulus Programmable Divider with TSPC Technology
  5. Numerical Simulation of Single-anode and Double-anode Magnetron Injection Guns for 127.5 GHz 1 MW Gyrotron
  6. SINR Analysis of Hexagonal Multicarrier Transmission Systems in the Presence of Insufficient Synchronization for Doubly Dispersive Channel
  7. Performance Analysis of Opportunistic and Incremental Relaying Coded Cooperation: Impact of Exchange Ratio
  8. A Stacked Microstrip Patch Antenna Loaded With U-Shaped Slots
  9. 8th International Workshop on Intelligent Transportation (WIT 2011), Hotel Hafen Hamburg, 22. und 23. März 2011
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