Generic placeholder image

Recent Advances in Electrical & Electronic Engineering

Author(s): Kittipong Nithiporndecha and Chatrpol Pakasiri*

DOI: 10.2174/2352096513666200212103557

DownloadDownload PDF Flyer Cite As
A UHF Compact Complex Impedance-transforming Balun with High Isolation

Page: [1135 - 1144] Pages: 10

  • * (Excluding Mailing and Handling)

Abstract

Background: A compact complex impedance-transforming balun for UHF frequencies, which is based on a coupled-line structure that matched all ports and provided high output port isolation, was designed in this paper.

Methods: A lumped component transformation was used to minimize circuit size. The implemented circuit operated at 433 MHz with the reflection coefficients less than -16 dB at all ports, 0.22 dB amplitude balance and 180° phase balance at the output ports. The signal coupling between the output ports was -16.8 dB. The circuit size is small at 0.032λ.

Results: Complex impedance-transforming baluns were designed to operate at 433 MHz. The source impedance at port 1 was set at Zs = 12 - j12Ω and the load impedances at port 2 and 3 were set at ZL = 80 + j30Ω.

Conclusion: A compact complex impedance-transforming balun at UHF frequency, with all ports matched and high isolations, was designed and illustrated in this paper.

Keywords: Balun, complex impedance, lumped-component, UHF, SiGe BiCMOS technology, two pot circuit.

Graphical Abstract

[1]
M. Mirmozafari, G. Zhang, S. Saeedi, and R.J. Doviak, "A dual linear polarization highly isolated crossed dipole antenna for MPAR application", IEEE Antennas Wirel. Propag. Lett., vol. 16, pp. 1879-1882, 2017.
[http://dx.doi.org/10.1109/LAWP.2017.2684538]
[2]
C. Wu, C. Lu, and W. Cao, "Wideband dual-polarization slot antenna with high isolation by using microstrip line balun feed", IEEE Antennas Wirel. Propag. Lett., vol. 16, pp. 1759-1762, 2017.
[http://dx.doi.org/10.1109/LAWP.2017.2672538]
[3]
G. Zhang, J. Wang, and W. Wu, "Wideband balun bandpass filter explored for a balanced dipole antenna with high selectivity", Electron. Lett., vol. 52, pp. 1153-1155, 2016.
[http://dx.doi.org/10.1049/el.2016.0716]
[4]
J.H. Lee, J.A. Park, C.S. Cho, and J.W. Lee, "New design formulas for asymmetric coupled-section Marchand balun", IEEE Microw. Compon. Lett., vol. 25, pp. 448-450, 2015.
[http://dx.doi.org/10.1109/LMWC.2015.2429091]
[5]
B.L. Pham, H.H. Ta, A-V. Pham, R.E. Leoni, and Y. Leviatan, "23:1 bandwidth ratio quasi-lumped component Balun on a multilayer organic substrate", IET Microw. Antennas Propag., vol. 10, pp. 561-567, 2016.
[http://dx.doi.org/10.1049/iet-map.2015.0589]
[6]
F. Huang, J. Wang, L. Zhu, and W. Wu, "Compact microstrip balun diplexer using stub-loaded dual-mode resonators: Electronics letters", IET J. Magaz., vol. 52, no. 24, pp. 1994-1996, 2016.
[7]
R. Gupta, A.P. Yadav, and M.S. Hashmi, "Symmetric tri-band Balun architecture with a systematic design procedure: Twenty-third National Conference on Communications (NCC)", IEEE Conference, 2017
[8]
F. Huang, J. Wang, and L. Zhu, "A new approach to design a microstrip dual-mode Balun bandpass filter", IEEE Microw. Wirel. Compon. Lett., vol. 26, no. 4, 2016.
[http://dx.doi.org/10.1109/LMWC.2016.2538726]
[9]
W. Zhang, Y. Liu, Y. Wu, W. Wang, M. Su, and J. Gao, "A complex impedance-transforming coupled-line balun", Prog. Electromagn. Res. Letters, vol. 48, pp. 123-128, 2014.
[http://dx.doi.org/10.2528/PIERL14062402]
[10]
Y.C. Leong, K.S. Ang, and C.H. Lee, "A derivation of a class of 3-port Baluns from symmetrical 4-port networks IEEE MTT-S Int. Microwave Symp. Digest Seattle, WA, USA,", 2002, pp. 1165-1168
[11]
R.S. Michaelsen, T.K. Johansen, and K.M. Tamborg, "Analysis and design of complex impedance transforming marchand Baluns 20th International Conference on Microwaves, Radar and Wireless Communications (MIKON)", IEEE Conference, 2014
[12]
Y. Wu, L. Yao, W. Zhang, W. Wang, and Y. Liu, "A planar dual-band coupled-line Balun with impedance transformation and high isolation", IEEE Access, vol. 4, pp. 9689-9701, 2016.
[http://dx.doi.org/10.1109/ACCESS.2016.2640187]
[13]
G. Zhang, J. Chen, and H. Tang, "A miniaturized marchand Balun based on the LTCC technology: Cross strait quad-regional radio science and wireless technology conference", IEEE Conference, 2013
[14]
H-R. Ahn, Asymmetric passive components in microwave integrated circuits., Wiley & Sons: New Jersey, 2006.
[http://dx.doi.org/10.1002/0470036966]
[15]
T-G. Ma, C-W. Wang, C-H. Lai, and Y-C. Tseng, Synthesized Transmission Lines Design, Circuit Implementation, and Phased Array Applications., Wiley: Singapore, 2017, pp. 11-12.
[16]
"NIELS KIRKEBY Baluns Shrink to Tiny 0404 Footprint", UK_ANA_BD2425N5075A00_AN datasheet, Nov . 2005
[17]
Agilent Technologies Inc Advanced Design System, .