Ultra Wideband Power Divider Design Implementing Microstrip with Slotted Ground
Keywords:Microstrip-slot, power divider, twosection, ultra wideband
This article proposes a compact design of a two-section power divider, which operates over an ultra wideband frequency range of 3-11 GHz. The design approach of microtrip with slotline at the ground plane is applied to reduce the size of the circuit and to achieve wide bandwidth coverage. The rectangular slots are implemented at the ground plane, which is positioned symmetrically underneath the second and third arms of each microstrip quarter-wave transformer to reduce its length up to 33.34%. These attributes lead to an easily fabricated 20 mm x 23 mm compact power divider with a reduced size (by 23.33%). The bandwidth performance is improved up to 19.4% compared to a conventional divider. The design is realized by implementing the Rogers TMM4 substrate and simulated by using CST Microwave Studio. The power divider is verified by using a vector network analyzer (VNA). A good agreement between simulation and fabrication is achieved in terms of return loss, isolation and transmission coefficients across the UWB frequency range.
C.-X. Wang, F. Haider, et al., “Cellular architecture and key technologies for 5G wireless communication networks,” IEEE Commun. Mag., vol. 52, no. 2, pp. 122-130, Feb. 2014.
N. Seman and S. N. A. M. Ghazali, “Design of multilayer microstrip-slot in-phase power divider with tuning stubs for wideband wireless communication applications,” Wirel. Pers. Commun., vol. 83, no. 4, pp. 2859-2867, Aug. 2015.
D. N. A. Zaidel, S. K. A. Rahim, N. Seman, R. Dewan, and B. M. Sa'ad, “New ultra-wideband phase shifter design with performance improvement using a tapered line transmission line for a butler matrix UWB application,” Appl. Comput. Electromagn. Soc. J., vol. 29, no. 8, pp. 611-617, July 2014.
D. M. Pozar, Microwave Engineering, 4th Edition, Wiley, New York, 2011.
Q. Guo, Y. Ma, and J. Ju, “A novel broadband high-power combiner,” Asia-Pacific Microwave Conference, Suzhou, pp. 3495-3498, Dec. 2005.
D. Kang, Y.-H. Pang, and H.-H. Chen, “A compact wilkinson power divider/combiner with twosection coupled lines for harmonics suppression,” Asia-Pacific Microwave Conference, Kaohsiung, pp. 995-997, Dec. 2012.
S. Gruszczynski and K. Wincza, “Miniaturized broadband multisection coupled-line wilkinson power divider designed with the use of quasilumped element technique,” International Caribbean Conference on Devices, Circuits and Systems, Playa del Carmen, pp. 1-4, Mar. 2012.
H. Oraizi and A.-R. Sharifi, “Design and optimization of broadband asymmetrical multisection Wilkinson power divider,” IEEE Trans. Microw. Theory Tech., vol. 54, no. 5, pp. 2220- 2231, May 2006.
X.-P. Ou and Q.-X. Chu, “A modified two-section UWB Wilkinson power divider,” International Conference on Microwave and Millimeter Wave Technology, Nanjing, pp. 1258-1260, Apr. 2008.
A. Mahan, S. H. Sedighy, and M. KhalajAmirhosseini, “A compact dual-band planar 4-way power divider,” Appl. Comput. Electromagn. Soc. J., vol. 32, no. 3, pp. 243-248, Mar. 2017.
S. Tsitsos, D. Efstathiou, P. Kyriazidis, and A. A. P. Gibson, “Design of an ultra wide-band power divider with harmonics suppression,” 6th International Conference From Scientific Computing to Computational Engineering, Athens, July 2014.
M. F. Khajeh, S. A. Mirtaheri, and S. Chamaani, “Design and analysis of a band-notched UWB 1 to 4 Wilkinson power divider using symmetric defected ground structure,” European Conference on Antennas and Propagation, Rome, pp. 860-864, Apr. 2011.
S. B. Cohn, “A class of broadband three-port TEMmode hybrids,” IEEE Trans. Microw. Theory Tech., vol. 19, no. 2, pp. 110-116, Feb. 1968.
K. H. Yusof, N. Seman, M. H. Jamaluddin, and D. N. A. Zaidel, “Characterization and formulation of microstrip-slot impedance with different thickness and relative permittivity,” Applied Mechanics and Materials, vol. 781, pp. 53-56, Aug. 2015.
R. Janaswamy and D. H. Schaubert, “Characteristic impedance of a wide slotline on low-permittivity substrates,” IEEE Trans. Microw. Theory Tech., vol. 34, no. 8, pp. 900-902, Aug. 1986.
L. G. Maloratsky, “Microstrip circuit with a modified ground plane,” High Frequency Electronic, Summit Technical Media, pp. 38-47, 2009.