1. Torre, L. A., F. Bray, R. L. Siegel, J. Ferlay, T. J. Lortet, and A. Jemal, "Global cancer statistics 2012," A Cancer Journal for Clinicians, 87-108, 2012. Google Scholar
2. Jemal, A., F. Bray, M. M. Center, J. Ferlay, E. Ward, and D. Forman, "Global cancer statistics 2011," A Cancer Journal for Clinicians, 69-90, 2011.
doi:10.3322/caac.20107 Google Scholar
3. Speirs, V. and A. Shaaban, "The rising incidence of male breast cancer," Breast Cancer Research and Treatment, 429-430, 2009.
doi:10.1007/s10549-008-0053-y Google Scholar
4. Jotwani, A. and J. Gralow, "Early detection of breast cancer," Molecular Diagnosis and Therapy, 349-357, 2009.
doi:10.1007/BF03256340 Google Scholar
5. Romeo, S., L. Di Donato, O. M. Bucci, I. Catapano, L. Crocco, M. R. Scarfı, and R. Massa, "Dielectric characterization study of liquid-based materials for mimicking breast tissues," Microwave and Optical Technology Letters, 1276-1280, 2011.
doi:10.1002/mop.26001 Google Scholar
6. Riblet, G. P. and E. R. B. Hansson, "The use of a matched symmetrical five-port junction to make six-port measurements," Microwave Symposium Digest, 151-153, 1981.
doi:10.1109/MWSYM.1981.1129852 Google Scholar
7. Lee, K. Y., A. Zulkifly, J. A. Mohamad, K. Y. You, and E. M. Cheng, "Determination of moisture content in oil palm fruits using a five-port reflectometer," Sensors, Vol. 11, No. 4, 4073-4085, 2011. Google Scholar
8. Duenas-Jimenez, A. and C. A. Bonilla-Barragan, "On the calibration of a microwave network sixport reflection analyzer," IEEE Transactions on Instrumentation and Measurement, Vol. 56, No. 5, 1763-1769, 2007.
doi:10.1109/TIM.2007.903618 Google Scholar
9. Lee, K. Y., B. K. Chung, K. Y. You, E. M. Cheng, and A. Zulkifly, "Development of a symmetric ring junction as a four-port reflectometer for complex reflection coefficient measurements," Radioengineering, Vol. 24, No. 4, 906-911, 2015.
doi:10.13164/re.2015.0906 Google Scholar
10. Yao, J. J. and S. P. Yeo, "Six-port reflectometer based on modified hybrid couplers," IEEE Transactions on Microwave Theory and Techniques, Vol. 56, No. 2, 493-498, 2008.
doi:10.1109/TMTT.2007.914626 Google Scholar
11. Staszek, K., J. Sorocki, P. Kaminski, K. Wincza, and S. Gruszczynski, "A broadband 3 dB tandem coupler utilizing right/left handed transmission line sections," IEEE Microwave and Wireless Components Letters, Vol. 24, No. 4, 236-238, 2014.
doi:10.1109/LMWC.2014.2299546 Google Scholar
12. Julrat, S., M. Chongcheawchamnan, T. Khaoraphapong, and I. D. Robertson, "Analysis and design of a differential sampled-line six-port reflectometer," IEEE Transactions on Microwave Theory and Techniques, Vol. 61, No. 1, 244-255, 2013.
doi:10.1109/TMTT.2012.2227788 Google Scholar
13. Judah, S. K. and M. D. Judd, "Direct synthesis of the matched symmetric five-port junction from its scattering matrix," IEE Proceedings H — Microwaves, Antennas and Propagation, Vol. 133, No. 2, 95-98, 1986.
doi:10.1049/ip-h-2.1986.0015 Google Scholar
14. De-Ronde, F. C., "Octave-wide matched symmetrical, reciprocal, 4- and 5 ports," Microwave Symposium Digest, 521-523, 1982.
doi:10.1109/MWSYM.1982.1130778 Google Scholar
15. Yeo, S. P., T. S. Yeo, and K. M. Ng, "First-order eigenmode analysis of symmetrical five-port microstrip ring coupler," Microwave and Optical Technology Letters, Vol. 2, No. 3, 91-94, 1989.
doi:10.1002/mop.4650020305 Google Scholar
16. Duenas-Jimenez, A., A. Serrano-Santoyo, and F. J. Mendieta, "On the synthesis of some ring junctions for six-port measurement applications," Microwave and Optical Technology Letters, Vol. 5, No. 11, 559-563, 1992.
doi:10.1002/mop.4650051106 Google Scholar
17. Kim, D. I., K. Araki, and Y. Naito, "Properties of the symmetrical circuit and its broad-band five-port design," IEEE Transactions on Microwave Theory and Techniques, Vol. 32, No. 1, 51-57, 1984.
doi:10.1109/TMTT.1984.1132611 Google Scholar
18. Yeo, S. P. and F. C. Choong, "Matched symmetrical five-port microstrip coupler," IEEE Transactions on Microwave Theory and Techniques, Vol. 49, No. 8, 1498-1500, 2001.
doi:10.1109/22.939932 Google Scholar
19. Pozar, D. M., Microwave Engineering, 4th Ed., Wiley, 2004.
20. Potter, C. and A. Bullock, "Nonlinearity correction of microwave diode detectors using a repeatable attenuation step," Microwave Journal, Vol. 36, 272, 274, 277-279, 1993. Google Scholar
21. Engen, G. F., "Calibrating the six-port reflectometer by means of sliding terminations," IEEE Transactions on Microwave Theory and Techniques, Vol. 26, No. 12, 951-957, 1978.
doi:10.1109/TMTT.1978.1129527 Google Scholar
22. Wiedmann, F., B. Huyart, E. Bergeault, and L. Jallet, "A new robust method for six-port reflectometer calibration," IEEE Transactions on Instrumentation and Measurement, Vol. 48, No. 5, 927-931, 1999.
doi:10.1109/19.799649 Google Scholar
23. Stumper, U., "Finding initial estimates needed for the engen method of calibrating single six-port reflectometers," IEEE Transactions on Microwave Theory and Techniques, Vol. 38, No. 7, 946-949, 1990.
doi:10.1109/22.55790 Google Scholar
24. Neumeyer, B., "A new analytical method for complete six-port reflectometer calibration," IEEE Transactions on Instrumentation and Measurement, Vol. 39, No. 2, 376-379, 1990.
doi:10.1109/19.52518 Google Scholar
25. Potter, C. M. and G. Hjipieris, "A robust six- to four-port reduction algorithm," Microwave Symposium Digest, 1263-1266, 1993. Google Scholar
26. You, K. Y., RF Coaxial Slot Radiators: Modeling, Measurements and Applications, 1st Ed., Artech House, 2015.
27. Gregory, A. P. and R. N. Clarke, "Tables of the complex permittivity of dielectric reference liquids at frequencies up to 5GHz," NPL Rep. CETM, Vol. 33, 2001. Google Scholar