References

• 1. 1)
     • 3. Mo, T.T., Xue, Q., Chan, C.H.: ‘A broadband compact microstrip rat-race hybrid using a novel CPW inverter’, IEEE Trans. Microw. Theory Tech., 2007, 55, (1), pp. 161–167 (doi: 10.1109/TMTT.2006.888938).
  2. 2)
     • 2. Kim, S., Jeong, J.: ‘Reconfigurable 1:3 power divider using coupled lines’, Electron. Lett., 2009, 45, (22), pp. 1141–1143 (doi: 10.1049/el.2009.1855).
  3. 3)
     • 5. Zhang, X., Wang, T., Xiang, Y., Liang, C.: ‘Wideband three-way out-of-phase microstrip power divider’, Electron. Lett., 2015, 51, (5), pp. 404–406 (doi: 10.1049/el.2014.3915).
  4. 4)
     • 17. Djoumessi, E.E., Marsan, E., Caloz, C., et al: ‘Varactor-turned dual-band quadrature hybrid coupler’, IEEE Microw. Compon. Lett., 2006, 16, (11), pp. 603–605 (doi: 10.1109/LMWC.2006.884905).
  5. 5)
     • 1. Chang, C.Y., Yang, C.C.: ‘A novel broad-band Chebyshev-response rat-race ring coupler’, IEEE Trans. Microw. Theory Tech., 1999, 47, (4), pp. 455–462 (doi: 10.1109/22.754879).
  6. 6)
     • 7. Zhang, X.C., Liang, C.H., Xie, J.W.: ‘Microstrip phase inverter using interdigital strip lines and defected ground’, Prog. Electromagn. Res. Lett., 2012, 29, pp. 167–173 (doi: 10.2528/PIERL11121403).
  7. 7)
     • 8. Kim, J.H., Woo, D.W., Jo, G.Y., Park, W.S.: ‘Microstrip phase inverter using slotted ground’. IEEE Antenna and Propagation Society Int. Symp. (APSURS), Toronto, ON, Canada, July 2010, pp. 1–4.
  8. 8)
     • 3. Wong, K.W., Chiu, L., Xue, Q.: ‘Wideband parallel-strip bandpass filter using phase inverter’, IEEE Microw. Wirel. Compon. Lett., 2008, 18, (8), pp. 503–505 (doi: 10.1109/LMWC.2008.2001001).