Abstract
In this paper, the systematic design for a dual-band balun featuring impedance transformation and high output isolation is presented. A dual-band balun capable of conducting transformation between an unbalanced 50-Ω line and a balanced one of 300-Ω is proposed for its operations at 2.4-5.2 GHz with high output isolation. The combination of a dual-band λ4 stepped-impedance-stub line and a dual-band 4 T-junction coupled line produces an output phase difference of 180° at the two operating frequencies for the balun. An important feature of the proposed design is the 1:6 impedance transformation from an unbalanced source to a balanced load. High isolation can also be achieved by introducing an isolation circuit between the output ports. The measured isolation is better than -26 dB. The phase imbalance is under 3°, and the magnitude imbalance is less than 0.9 dB within the bandwidths.
Original language | English |
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Article number | 8854785 |
Pages (from-to) | 143805-143813 |
Number of pages | 9 |
Journal | IEEE Access |
Volume | 7 |
DOIs | |
State | Published - 2019 |
Bibliographical note
Publisher Copyright:© 2013 IEEE.
Keywords
- Dual-band balun
- high isolation
- impedance transformation