The Journal of the Korea institute of electronic communication sciences (한국전자통신학회논문지)

Korea Institute of Electronic Communication Science (한국전자통신학회)
권호 표지
DOI QR코드

DOI QR Code

Study on Size-Reduced λ/4 Impedance Transformer using T-Equivalent Circuit

T형 등가회로를 이용하여 크기를 감소시킨 λ/4 임피던스 변환기의 연구

  • 윤태순 (호남대학교 전자공학과)
  • Received : 2023.06.22
  • Accepted : 2023.08.17
  • Published : 2023.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, a modified equations of the T-equivalent circuit of the transmission line with the arbitrary electrical length is suggested. The suggested equations can be calculated without limitation of the equal branch-line. So, a modified T-equivalent circuit can be made with the arbitrary position of the open-stub. Also, the modified T-equivalent circuit can be applied in the arbitrary electrical length and impedance of the transmission line. For example, the λ/4 impedance transformer is converted with 4 divided T-equivalent circuit. The converted λ/4 impedance transformer has the size reduction ratio of 39.4%.

본 논문에서는 λ/4 전송선로의 T형 등가회로를 응용하여 임의의 길이를 갖는 전송선로에 대한 T형 등가회로를 제안하였다. 또한, 동일한 선로 길이라는 제한 없이 등가회로의 스터브의 위치를 조정할 수 있도록 수식을 만들어 등가회로의 활용도를 높이고자 하였다. 또한, 제안된 T형 등가회로는 λ/4 전송선로 뿐만 아니라 임의의 선로 길이 및 임피던스를 갖는 경우에도 적용할 수 있다. 제안된 T형 등가회로의 활용 예로 4 분할된 T형 등가회로를 갖도록 구성하여 λ/4 임피던스 변환기에 적용하였다. 변형된 임피던스 변환기는 0.15λ로 설계되어 39.4%의 크기 감소율을 보였다.

Keywords

References

  1. S. Kim and J. Song, "Miniaturized UWB BPF Design that is applicable to Ultrafast Wireless Communication Systems," J. of Korea Institute Electronic Communication Science, vol. 5, no. 6, 2010, pp. 620-624.
  2. S. Rhee, S. Lee, and O. Kim, "Stepped Impedance LPF Using MCSI," J. of Korea Institute Electronic Communication Science, vol. 3, no. 3, 2008, pp. 153-157.
  3. S. Rhee, "Printed Dipole Antenna Fed by Broadside Coupled Stripline for Wideband," J. of Korea Institute Electronic Communication Science, vol. 17, no. 6, 2022, pp. 1033-1038.
  4. J. Yoon and C. Yu, "Design and Fabrication of Dual Linear Polarization Stack Antenna for 4.7GHz Frequency Band," J. of Korea Institute Electronic Communication Science, vol. 18, no. 2, 2023, pp. 251-258.
  5. H. Son, J. Jin, and Y. Rhee, "Analysis of Signal Distortion for Ultra High Definition Video Pattern Control," J. of Korea Institute Electronic Communication Science, vol. 9, no. 10, 2014, pp. 1197-1206. https://doi.org/10.13067/JKIECS.2014.9.10.1197
  6. R. Mongia, I. Bahl, and P. Bhartia, RF and Microwave Coupled-line Circuits. Boston: Artech House, 1999.
  7. K. Gupta, R. Garg, I. Bahl, and P. Bhartia, Microstrip Lines and Slotlines, Boston: Artech House, 1996.
  8. X. Zhou, X. Liu, H. Guo, and L. Shao, "Design of broadband impedance transformer using coupled microstrip transmission lines," IEEE Int. Symp. on Microwave, Antenna, Propagation and EMC Technologies for Wireless Comm., Beijing, China, 2009, pp. 994-997.
  9. T. Satitchantrakul and D. Torrungrueng, "Compact Wideband Multi-Section Quarter-Wave-Like Transformers with Unequal Electrical Lengths," Int. Symp. on Antennas and Propagation (ISAP), Xi'an, China, 2019, pp. 1-3.
  10. J. Rayno, N. Celik, and M. Iskander, "Dual-polarization cylindrical long slot array (CLSA) antenna integrated with compact broadband baluns and slot impedance transformers," IEEE Antennas and Wireless Propagation Lett., vol. 12, 2013, pp. 1384-1387. https://doi.org/10.1109/LAWP.2013.2284595