© The Institution of Engineering and Technology
For the first time, a novel bandwidth-tunable filtering balun based on compact 3D configuration is presented. The overall design is basically composed of a two-layer horizontal feeding plane, a three-layer vertically mounted plane, and the transmission-line circuits disposed on both. Implementing the ring resonator in vertical double-sided parallel-strip line, the complete horizontal ground and frequency-independent phase difference are subtly combined. Connecting the shunt varactor diodes with the inserted vertical ground, the desirable filtering property and flexible bandwidth tunability are splendidly fulfilled. A prototype balun centred at 1.53 GHz is fabricated. The measured operating bandwidth is dynamically tuned from 0.87 to 1.23 GHz with a return loss <−10 dB, forcefully validating the design concept.
References
-
-
1)
-
5. Yao, L., Wu, Y., Jiao, L., Liu, Y.: ‘A novel three-dimensional dual-band balun with frequency-independent phase difference and complete ground’, HKIE Trans., 2016, 23, (1), pp. 26–33 (doi: 10.1080/1023697X.2015.1131640).
-
2)
-
6. Yao, L., Wu, Y., Li, M., et al: ‘Three-dimensional high-isolated dual-band balun using double-sided parallel-strip line with inserted conductor plane’, Electron. Lett., 2017, 53, (17), pp. 1211–1213 (doi: 10.1049/el.2017.1954).
-
3)
-
4. Yao, L., Wu, Y., Li, M., et al: ‘Design of three-dimensional filtering balun with inherent complete ground and enhanced stopband rejection’, Electron. Lett., 2018, 54, (6), pp. 361–363 (doi: 10.1049/el.2017.4821).
-
4)
-
7. Shen, X., Wu, Y., Zhou, S., et al: ‘A novel coupled-line tunable Wilkinson power divider with perfect port match and isolation in wide frequency tuning range’, Trans. Compon. Packag. Manuf. Technol., 2016, 6, (6), pp. 917–925 (doi: 10.1109/TCPMT.2016.2565601).
-
5)
-
6. ‘Skyworks SMV1265–011 data sheet Skyworks solutions’. .
-
6)
-
6. Wu, Y., Yao, L., Jiao, L., Wang, W., Liu, Y.: ‘UWB balun with complete ground based on vertically mounted planar structure’, Electron. Lett., 2016, 52, (5), pp. 405–406 (doi: 10.1049/el.2015.4131).
-
7)
-
5. Beukman, T.S., Geschke, R.H.: ‘A tune-all wideband filter based on perturbed ring-resonators’, Microw. Wirel. Compon. Lett., 2013, 23, (3), pp. 131–133 (doi: 10.1109/LMWC.2013.2245643).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2018.7145
Related content
content/journals/10.1049/el.2018.7145
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Bandwidth-tunable filtering balun based on compact 3D configuration