Title :
A Simple Printed Compensated Balun for Enhanced Ultra-Wideband Performances
Author :
Keng-Chih Lin ; Yi-Cheng Lin
Author_Institution :
Grad. Inst. of Commun. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
This letter presents a printed compensated balun of simple structure for enhanced ultra-wideband performances. The presented design stems from the generic compensated type of Marchand balun with an optimization on selected parameters for the bandwidth enhancement. A simple planar structure based on a 3-metal-layered PCB is proposed to realize the optimal design of the circuit scheme. The proposed balun design was implemented on a standard FR4 PCB and successfully verified with consistent simulation and measurement results. The presented balun achieves ultra wideband performances with a return loss better than 10 dB from 0.45 GHz to 6.85 GHz, a bandwidth ratio of 15:1. Over the entire bandwidth, the magnitude and phase imbalances are within 0.5 dB and 10 °, respectively. To the best of our knowledge, this work performs the largest bandwidth among the printed or planar baluns reported in the literature to date.
Keywords :
baluns; bandwidth allocation; optimisation; printed circuit design; ultra wideband antennas; 3-metal-layered PCB; FR4 PCB; Marchand balun; balun design; bandwidth 0.45 GHz to 6.85 GHz; bandwidth enhancement; bandwidth ratio; circuit scheme; generic compensated type; magnitude; optimal design; optimization; phase imbalance; planar balun; planar structure; printed balun; printed compensated balun; return loss; ultra-wideband performances; Impedance matching; Integrated circuit modeling; Optimization; Transmission line measurements; Ultra wideband technology; Wideband; Balun; Marchand; printed; ultra-wideband;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2013.2285211