Projects

Introduction

At ARMI Laboratory, we are performing research in applied electromagnetics and microwave engineering. We have active projects on the development of novel low-profile wireless sensors for harsh environment applications. Our research interests also include phased array antennas and beamsteerable reflectarray antennas. We have been one of the pioneers in developing integrated filter/antennas and endeavor to further advance this technology. Finally, tunable and flexible microwave devices such as phase shifters, filters and antennas are under development at ARMI Laboratory to be employed in the next-generation conformal and deployable telecommunications systems.

Sensors for Harsh Environments

Related Publications:

  1. H. Cheng*, X. Ren*, S. Ebadi*, Y. Chen, L. An, and X. Gong, “Wireless passive temperature sensors using integrated cylindrical resonator/antenna for harsh-environment applications,” IEEE Sensors Journal, vol. 15, no. 3, pp. 1453-1462, Mar. 2015. DOI: 10.1109/JSEN.2014.2363426.

  2. H. Cheng*, S. Ebadi*, X. Ren*, and X. Gong, “Wireless passive high-temperature sensor based on multifunctional reflective patch antenna up to 1050 degrees centigrade,” Sensors and Actuators A: Physical, vol. 222, 1 February 2015, pp. 204-211. DOI: 10.1016/j.sna.2014.11.010.

  3. H. Cheng*, G. Shao, S. Ebadi*, X. Ren*, K. Harris, J. Liu, C. Xu, L. An, and X. Gong, “Evanescent-mode-resonator-based and antenna-integrated wireless passive pressure sensors for harsh-environment applications,” Sensors and Actuators A: Physical, vol. 220, 1 December 2014, pp. 22-33. DOI: 10.1016/j.sna.2014.09.010.

  4. H. Cheng*, X. Ren*, S. Ebadi*, and X. Gong, “A wide-band square slot antenna for high-temperature applications,” in 2013 IEEE AP-S Int. Symp., Orlando, FL, July 7-13, 2013. DOI: 10.1109/APS.2013.6710782.

  5. X. Ren*, S. Ebadi*, Y. Chen, L. An, and X. Gong, “Characterization of SiCN ceramic materials dielectric properties at high temperatures for harsh environment sensing applications,” IEEE Transactions on Microwave Theory and Techniques, vol. 61, no. 2, pp. 960-971, Feb. 2013. DOI: 10.1109/TMTT.2012.2234476.

  6. S. Ebadi, X. Ren, Y. Chen, L. An, and X. Gong, “High temperature material characterization: a step towards wireless microwave sensors for turbine applications,” RF Technology International, May, 2012. (Invited)

  7. H. Cheng*, S. Ebadi*, and X. Gong, “A low-profile wireless passive temperature sensor using resonator/antenna integration up to 1000oC,” IEEE Antennas and Wireless Propagation Letters, vol. 11, pp. 369-372, 2012. DOI: 10.1109/LAWP.2012.2192249.

  8. H. Cheng*, S. Ebadi*, and X. Gong, “A wireless pressure sensor design using a microwave cavity resonator,” in 2012 IEEE AP-S Int. Symp., Chicago, IL, July 8-14, 2012. DOI: 10.1109/APS.2012.6349060.

  9. X. Ren*, S. Ebadi*, and X. Gong, “A single-antenna wireless passive temperature sensing mechanism using a dielectrically-loaded resonator,” in 2012 IEEE AP-S Int. Symp., Chicago, IL, July 8-14, 2012. DOI: 10.1109/APS.2012.6349062.

  10. X. Gong, L. An, and C. Xu, “Wireless passive sensor development for harsh environment applications,” in 2012 IEEE International Workshop on Antenna Technology, Tucson, AZ, Mar. 5-7, 2012, pp. 140-143. DOI: 10.1109/IWAT.2012.6178418. (Invited)

  11. H. Cheng*, S. Ebadi*, X. Ren*, Y. Yusuf*, and X. Gong, “A compact wireless passive sensing mechanism based on a seamlessly integrated resonator/antenna,” in 2011 IEEE AP-S Int. Symp., Spokane, WA, July 3-8, 2011, pp. 1350-1353. DOI: 10.1109/APS.2011.5996540.

  12. X. Ren*, S. Ebadi*, H. Cheng*, Y. Chen, L. An, and X. Gong, “Wireless resonant frequency detection of SiCN ceramic resonator for sensor applications,” in 2011 IEEE AP-S Int. Symp., Spokane, WA, July 3-8, 2011, pp. 1856-1859. DOI: 10.1109/APS.2011.5996859.

  13. M. Lukacs*, X. Ren*, and X. Gong, “Wirelessly sensing resonant frequency of passive resonators with different Q factors,” in 2011 IEEE AP-S Int. Symp., Spokane, WA, July 3-8, 2011, pp. 1143-1146. DOI: 10.1109/APS.2011.5996485.

  14. X. Ren*, S. Ebadi*, Y. Chen, L. An, and X. Gong, “High-temperature characterization of SiCN ceramics for wireless passive sensing applications up to 500oC,” 12th IEEE Wireless and Microwave Technology Conference, Clear Water, FL, Apr. 18-19, 2011. DOI: 10.1109/WAMICON.2011.5872863.

  15. X. Ren*, T. Jiang, Y. Wang, L. An, and X. Gong, “Characterization of high-temperature ceramic materials at microwave frequencies for MEMS applications,” in 10th IEEE Wireless and Microwave Technology Conference, Clear Water, FL, Apr. 20-21, 2009. DOI: 10.1109/WAMICON.2009.5207277.

  16. X. Ren*, and X. Gong, “A wireless sensing technique using passive microwave resonators,” in 2008 IEEE AP-S Int. Symp., San Diego, CA, July 5-11, 2008, DOI: 10.1109/APS.2008.4619378.

ESPAR Phased Array Antennas

Related Publications:

  1. W. Ouyang*, and X. Gong, “A cavity-backed slot ESPAR E-plane array,” in 18th IEEE Wireless and Microwave Technology Conference, Cocoa Beach, FL, Apr. 24-25, 2017.

  2. W. Ouyang*, and X. Gong, “Frequency reconfigurable single-layer design of microstrip patch electrically-steerable parasitic array radiator (ESPAR),” in 2016 IEEE International Workshop on Antenna Technology, Cocoa Beach, FL, Feb. 29-Mar. 2, 2016, pp. 154-156. DOI: 10.1109/IWAT.2016.7434829

  3. J. Luther*, S. Ebadi*, and X. Gong, “A low-cost 2×2 planar array of 3-element microstrip electrically-steerable parasitic array radiator (ESPAR) subcells,” IEEE Transactions on Microwave Theory and Techniques, vol. 62, no. 10, pp. 2325-2336, Oct. 2014. DOI: 10.1109/TMTT.2014.2345335.

  4. J. Luther*, S. Ebadi*, and X. Gong, “Extraction of equivalent circuit model parameters of the feedless rectangular microstrip patch,” in 2013 IEEE AP-S Int. Symp., Orlando, FL, July 7-13, 2013. DOI: 10.1109/APS.2013.6710812.

  5. J. Luther*, S. Ebadi*, and X. Gong, “A comparison of microstrip patch ESPAR array and uniformly-illuminated array performance,” in 2012 IEEE AP-S Int. Symp., Chicago, IL, July 8-14, 2012. DOI: 10.1109/APS.2012.6348575.

  6. J. Luther*, S. Ebadi*, and X. Gong, “Single-layer design of microstrip patch electrically-steerable parasitic array radiator (ESPAR) with integrated DC isolation,” in 2012 IEEE MTT-S Int. Microwave Symp. Dig., Montréal, Canada, June 17-22, 2012. DOI: 10.1109/MWSYM.2012.6259682.

  7. J. Luther*, S. Ebadi*, and X. Gong, “A microstrip patch electronically steerable parasitic array radiator (ESPAR) antenna with reactance-tuned coupling and maintained resonance,” IEEE Transactions on Antennas and Propagation, vol. 60, no. 4, pp. 1803-1813, Apr. 2012. DOI: 10.1109/TAP.2012.2186265.

  8. J. Luther*, S. Ebadi*, and X. Gong, “Electrically-steerable parasitic array radiator (ESPAR) antenna design for arrays with two and three parasitically-coupled elements,” in 2012 IEEE Radio and Wireless Symposium, Santa Clara, CA, Jan. 15-19, 2012, pp. 79-82. DOI: 10.1109/RWS.2012.6175310. (Student Paper Competition 2nd Place Award)

  9. J. Luther*, and X. Gong, “A microstrip patch phased array antenna with parasitic elements and reactance-tuned coupling,” in 2011 IEEE AP-S Int. Symp., Spokane, WA, July 3-8, 2011, pp. 3291-3294. DOI: 10.1109/APS.2011.5997238. (Student Paper Competition Honorable Mention Award out of 150+ participants)

  10. Y. Yusuf*, and X. Gong, “A low-cost patch antenna phased array with analog beam steering using mutual coupling and reactive loading,” IEEE Antennas and Wireless Propagation Letters, vol. 7, pp. 81-84, Apr. 2008. DOI: 10.1109/LAWP.2008.916689.

  11. Y. Yusuf*, and X. Gong, “Beam-steerable patch antenna array using parasitic coupling and reactive loading,” in 2007 IEEE AP-S Int. Symp., Honolulu, HI, June 9-15, 2007, pp. 4693-4696. DOI: 10.1109/APS.2007.4396591.

Beamsteerable Reflectarray Antennas

  1. K. Karnati*, M. Trampler*, and X. Gong, “A Monolithically-BST-integrated Ka-band beamsteerable reflectarray antenna,” IEEE Transactions on Antennas and Propagation, vol. 65, no. 1, pp. 159-166, Jan. 2017. DOI: 10.1109/TAP.2016.2627007.

  2. K. Karnati*, and X. Gong, “A continuous Ka-band beam-scanning reflectarray integrated with BST,” in 2015 IEEE AP-S Int. Symp., Vancouver, BC, Canada, July 19-25, 2015, pp. 1540-1541. DOI: 10.1109/APS.2015.7305159

  3. M. Trampler*, K. Karnati*, and X. Gong, “A Tunable BST integrated V-band patch element with interdigital gap configuration,” in 2015 IEEE AP-S Int. Symp., Vancouver, BC, Canada, July 19-25, 2015, pp. 2177-2178. DOI: 10.1109/APS.2015.7305477.

  4. K. Karnati*, Y. Shen*, W. Zhu*, M. Trampler*, S. Ebadi*, P. Wahid, and X. Gong, “Tunable and flexible electronics employing monolithically-integrated BST thin film,” in 2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, Suzhou, China, July 1-3, 2015. DOI: 10.1109/IMWS-AMP.2015.7324953

  5. K. Karnati*, Y. Shen*, M. Trampler*, S. Ebadi*, P. Wahid and X. Gong, “A BST-integrated capacitively-loaded patch for Ka- and X-band beamsteerable reflectarray antennas in satellite communications,” IEEE Transactions on Antennas and Propagation, vol. 63, no. 4, pp. 1324-1333, Apr. 2015. DOI: 10.1109/TAP.2015.2389252.

  6. M. Trampler*, K. Karnati*, and X. Gong, “Tunable ring-loaded patch element for beam-steerable reflectarray applications,” in 2014 IEEE AP-S Int. Symp., Memphis, TN, July 6-11, 2014. DOI: 10.1109/APS.2014.6904840.

  7. K. Karnati*, Y. Yusuf*, S. Ebadi*, and X. Gong, “Q factor analysis of reflectarray elements investigating the effects from angle of incidence using Floquet modes,” IEEE Transactions on Antennas and Propagation, vol. 62, no. 10, pp. 5017-5028, Oct. 2014. DOI: 10.1109/TAP.2014.2340896.

  8. K. Karnati*, and X. Gong, “Effects from angle of incidence on reflection properties of reflectarray elements,” in 2014 IEEE AP-S Int. Symp., Memphis, TN, July 6-11, 2014. DOI: 10.1109/APS.2014.6904732.

  9. K. Karnati*, Y. Yusuf*, S. Ebadi*, and X. Gong, “A comparison between TEM- & TE10-excited reflectarray element,” in 2013 IEEE AP-S Int. Symp., Orlando, FL, July 7-13, 2013. DOI: 10.1109/APS.2013.6711437. (Student Paper Competition Honorable Mention Award out of 141 participants)

  10. K. Karnati*, S. Ebadi*, and X. Gong, “Dependency of Ka-band reflectarray unit cell reflection properties on the spacing between antenna elements,” in 2013 IEEE Radio and Wireless Symposium, Austin, TX, Jan. 20-23, 2013. DOI: 10.1109/RWS.2013.6486660.

  11. K. Karnati*, Y. Yusuf*, S. Ebadi*, and X. Gong, “Theoretical analysis on reflection properties of reflectarray unit cells using quality factors,” IEEE Transactions on Antennas and Propagation, vol. 61, no. 1, pp. 201-210, Jan. 2013. DOI: 10.1109/TAP.2012.2214753.

  12. Y. Shen*, S. Ebadi*, P. Wahid, and X. Gong, “Ka-band tunable reflectarray unit cell element using BST technology,” in 2012 IEEE AP-S Int. Symp., Chicago, IL, July 8-14, 2012. DOI: 10.1109/APS.2012.6348729.

  13. K. Karnati*, Y. Yusuf*, S. Ebadi*, and X. Gong, “Reflection coefficient analysis of a TEM-excited reflectarray unit cell using quality factors,” in 2012 IEEE AP-S Int. Symp., Chicago, IL, July 8-14, 2012. DOI: 10.1109/APS.2012.6348733.

  14. Y. Shen*, S. Ebadi*, P. Wahid, and X. Gong, “Tunable reflectarray unit cell element using BST technology,” in 2012 IEEE Radio and Wireless Symposium, Santa Clara, CA, Jan. 15-19, 2012, pp. 43-46. DOI: 10.1109/RWS.2012.6175302.

  15. D. Oloumi, S. Ebadi*, A. Kordzadeh, A. Semnani, P. Mousavi, and X. Gong, “Miniaturized reflectarray unit cell using fractal-shaped patch-slot configurations,” IEEE Antennas and Wireless Propagation Letters, vol. 11, pp. 10-13, 2012. DOI: 10.1109/LAWP.2011.2181478.

  16. K. Karnati*, S. Ebadi*, and X. Gong, “Effects of inter-element spacing on mutual coupling and resonant properties in reflectarray unit cell design,” in 2012 IEEE Radio and Wireless Symposium, Santa Clara, CA, Jan. 15-19, 2012, pp. 83-86. DOI: 10.1109/RWS.2012.6175299.

  17. K. Karnati*, S. Ebadi*, and X. Gong, “Effect of dielectric thickness on phase swing of a Ka-band microstrip reflectarray unit cell,” in 2011 IEEE AP-S Int. Symp., Spokane, WA, July 3-8, 2011, pp. 948-951. DOI: 10.1109/APS.2011.5996434.

Filter/Antenna Integration

  1. R. Lovato*, and X. Gong, “A planar vertically-integrated tunable filter-antenna with constant absolute bandwidth,” in 2017 IEEE MTT-S Int. Microwave Symp. Dig., Honolulu, HI, June 4-9, 2017.

  2. R. Lovato*, and X. Gong, “A Third-Order High-Q SIW Filter/Antenna with Two Cavities and One Integrated Slot Antenna,” in 2016 IEEE AP-S Int. Symp., Fajardo, Puerto Rico, June 26-July 1, 2016. (Student Paper Competition Honorable Mention Award).

  3. R. Lovato*, T. Li*, and X. Gong, “Electrically tunable integrated patch antenna with planar filter,” in 16th IEEE Wireless and Microwave Technology Conference, Cocoa Beach, FL, Apr. 13-15, 2015. DOI: 10.1109/WAMICON.2015.7120365

  4. T. Li*, H. Cheng*, and X. Gong, “Integrated single-fed circularly-polarized patch antennas with high-Q cavity filters,” in 2014 IEEE AP-S Int. Symp., Memphis, TN, July 6-11, 2014, pp. 1873-1874. DOI: 10.1109/APS.2014.6905263

  5. T. Li*, K. Karnati*, and X. Gong, “Approach to realize wide-scan-angle phased array with enhanced bandwidth and filtering function by using integrated filter/patch,” in 2014 IEEE MTT-S Int. Microwave Symp. Dig., Tampa, FL, June 1-6, 2014. DOI: 10.1109/MWSYM.2014.6848546.

  6. Y. Yusuf*, and X. Gong, “Integration of 3-D High-Q Filters with Monopole Antennas,” Microwave and Optical Technology Letters, vol. 56, no. 4, pp. 921-925, Apr. 2014. DOI: 10.1002/mop.28221.

  7. Y. Yusuf*, H. Cheng*, and X. Gong, “Co-designed substrate-integrated-waveguide filters with patch antennas,” IET Microwaves, Antennas and Propagation, vol. 7, no. 7, pp. 493-501, May 2013. DOI: 10.1049/iet-map.2012.0431.

  8. Y. Yusuf*, and X. Gong, “Integration of 3-D high-Q filters with aperture antennas and bandwidth enhancement utilizing surface waves,” IET Microwaves, Antennas and Propagation, vol. 7, no. 7, pp. 468-475, May 2013. DOI: 10.1049/iet-map.2012.0432.

  9. T. Li*, and X. Gong, “Integration of slot antenna with evanescent-mode filter for tunable front-end applications,” in 2013 IEEE AP-S Int. Symp., Orlando, FL, July 7-13, 2013. DOI: 10.1109/APS.2013.6710950. (Student Paper Competition Honorable Mention Award out of 141 participants)

  10. Y. Yusuf*, H. Cheng*, and X. Gong, “A seamless integration of 3-D vertical filters with highly efficient slot antennas,” IEEE Transactions on Antennas and Propagation, vol. 59, no. 11, pp. 4016-4022, Nov. 2011. DOI: 10.1109/TAP.2011.2164186.

  11. H. Cheng*, Y. Yusuf*, and X. Gong, “Vertically integrated three-pole filter/antenna for array applications,” IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 278-281, Apr. 2011. DOI: 10.1109/LAWP.2011.2135833.

  12. Y. Yusuf*, and X. Gong, “Compact low-loss integration of high-Q 3-D filters with highly efficient antennas,” IEEE Transactions on Microwave Theory and Techniques, vol. 59, no. 4, pp. 857-865, Apr. 2011. DOI: 10.1109/TMTT.2010.2100407.

  13. Y. Yusuf*, and X. Gong, “A vertical integration of high-Q filters with patch antennas with enhanced bandwidth and high efficiency,” in 2011 IEEE MTT-S Int. Microwave Symp. Dig., Baltimore, MD, June 5-10, 2011. DOI: 10.1109/MWSYM.2011.5972721.

  14. Y. Yusuf*, and X. Gong, “Integrated filter/antennas with high efficiency and increased bandwidth,” in 12th IEEE Wireless and Microwave Technology Conference, Clear Water, FL, Apr. 18-19, 2011. DOI: 10.1109/WAMICON.2011.5872870. (Invited)

  15. Y. Yusuf*, and X. Gong, “A new class of 3-D filter/antenna integration with high quality factor and high efficiency,” in 2010 IEEE MTT-S Int. Microwave Symp. Dig., Anaheim, CA, May 23-28, 2010, pp. 892-895. DOI: 10.1109/MWSYM.2010.5516915.

  16. X. Gong, W. J. Chappell, and L. P. B. Katehi, “Embedded radiating filters in metamaterial substrates,” in 2003 IEEE AP-S Int. Symp., Columbus, OH, June 22-27, 2003, vol. 3, pp. 351-354. DOI: 10.1109/APS.2003.1219859. (Invited)

High-Q Resonators and Filters

  1. X. Gong, T. Smyth, E. Ghaneie*, and W. J. Chappell, “High-Q resonators and filters inside advanced low temperature cofired ceramic substrates using fine-scale periodicity,” IEEE Transactions on Microwave Theory and Techniques, vol. 56, no. 4, pp. 922-930, Apr. 2008. DOI: 10.1109/TMTT.2008.919375.

  2. X. Gong, W. H. She, and W. J. Chappell, “Aperiodic artificial substrates for multipole bandpass filters,” IET Microwaves, Antennas and Propagation, vol. 1, no. 1, pp. 240-247, Feb. 2007. DOI: 10.1049/iet-map:20050337. (Invited, Special Issue on Metamaterials)

  3. X. Gong, T. Smyth, and W. J. Chappell, “Cofiring different dielectric constants inside LTCC for metamaterial applications,” in 2006 IEEE AP-S Int. Symp., Albuquerque, NM, July 9-14, 2006, pp. 1935-1938. DOI: 10.1109/APS.2006.1710953.

  4. X. Gong, W. H. She, E. Hoppenjans, Z. N. Wing, R. G. Geyer, J. W. Halloran, and W. J. Chappell, “Tailored and anisotropic dielectric constants through porosity in ceramic components,” IEEE Transactions on Microwave Theory and Techniques, vol. 53, no. 11, pp. 3638-3647, Nov. 2005. DOI: 10.1109/TMTT.2005.859039.

  5. S. Hajela, X. Gong, and W. J. Chappell, “Widely tunable high-Q evanescent-mode resonators using flexible polymer substrates,” 2005 IEEE MTT-S Int. Microwave Symp Dig., Long Beach, CA, June 12-17, 2005, DOI: 10.1109/MWSYM.2005.1517172.

  6. X. Gong, A. Margomenos, B. Liu, S. Hajela, W. J. Chappell, and L. P. B. Katehi, “Precision fabrication techniques and analysis on high-Q evanescent-mode resonators and filters of different geometries,” IEEE Transactions on Microwave Theory and Techniques, vol. 52, no. 11, pp. 2557-2566, Nov. 2004. DOI: 10.1109/TMTT.2004.837162.

  7. B. Liu, X. Gong, and W. J. Chappell, “Applications of layer-by-layer polymer stereolithography for three-dimensional high-frequency components,” IEEE Transactions on Microwave Theory and Techniques, vol. 52, no. 11, pp. 2567-2575, Nov. 2004. DOI: 10.1109/TMTT.2004.837165.

  8. W. H. She, X. Gong, and W. J. Chappell, “Fundamental constraints on two-dimensional EBG substrates,” in 2004 IEEE AP-S Int. Symp. Monterey, CA, June 20-25, 2004, vol. 2, pp. 1419-1422. DOI: 10.1109/APS.2004.1330453. (Invited)

  9. X. Gong, B. Liu, L. P. B. Katehi, and W. J. Chappell, “Layer-by-layer stereolithography (SL) of complex medium,” in 2004 IEEE AP-S Int. Symp., Monterey, CA, June 20-25, 2004, vol. 1, pp. 325-328. DOI: 10.1109/APS.2004.1329638. (Student Paper Competition Top 15 Finalist out of 200+ participants)

  10. B. Liu, X. Gong, and W. J. Chappell, “Layer-by-layer polymer stereolithography fabrication for three dimensional RF components,” in 2004 IEEE MTT-S Int. Microwave Symp. Dig., Fort Worth, TX, June 6-11, 2004, vol. 2, pp. 481-484. DOI: 10.1109/MWSYM.2004.1336017.

  11. X. Gong, B. Liu, L. P. B. Katehi, and W. J. Chappell, “Laser-based polymer stereolithography of vertically integrated narrow bandpass filters operating in K band,” in 2004 IEEE MTT-S Int. Microwave Symp. Dig., Fort Worth, TX, June 6-11, 2004, vol. 2, pp. 425-428. DOI: 10.1109/MWSYM.2004.1336000. (Student Paper Competition 3rd Place Award out of 300+ participants)

  12. X. Gong, A. Margomenos, B. Liu, W. J. Chappell, and L. P. B. Katehi, “High-Q evanescent-mode filters using silicon micromachining and polymer stereolithography (SL) processing,” in 2004 IEEE MTT-S Int. Microwave Symp. Dig. Fort Worth, TX, June 6-11, 2004, vol. 2, pp. 433-436. DOI: 10.1109/MWSYM.2004.1336002.

  13. X. Gong, W. J. Chappell, and L. P. B. Katehi, “Multifunctional substrates for high-frequency applications,” IEEE Microwave and Wireless Components Letters, vol. 13, no. 10, pp. 428-430, Oct. 2003. DOI: 10.1109/LMWC.2003.818525.

  14. W. J. Chappell, and X. Gong, “Wide bandgap composite EBG substrates,” IEEE Transactions on Antennas and Propagation, vol. 51, no. 10, pp. 2744-2750, Oct. 2003. DOI: 10.1109/TAP.2003.817569. (Invited, Special Issue on Metamaterials)

  15. X. Gong, W. J. Chappell, and L. P. B. Katehi, “Effective medium properties of finely periodic substrates,” in 2003 IEEE AP-S Int. Symp. Columbus, OH, June 22-27, 2003, vol. 1, pp. 489-492. DOI: 10.1109/APS.2003.1217503. (Student Paper Competition Top 15 Finalist out of 200+ participants)

  16. W. J. Chappell, and X. Gong, “Narrow Ka bandpass filters using periodically loaded substrates,” in 2003 IEEE MTT-S Int. Microwave Symp. Dig., Philadelphia, PA, June 8-13, 2003, vol. 3, pp. 1611-1614. DOI: 10.1109/MWSYM.2003.1210446.

  17. X. Gong, W. J. Chappell, and L. P. B. Katehi, “Reduced size capacitive defect EBG resonators,” in 2002 IEEE MTT-S Int. Microwave Symp. Dig., Seattle, WA, June 2-7, 2002, vol. 2, pp. 1091 -1094. DOI: 10.1109/MWSYM.2002.1011832.

Advanced Materials and Fabrication Techniques

  1. J. Maas, B. Liu, S. Hajela, Y. Huang, X. Gong, and W. J. Chappell, “Laser-based layer-by-layer polymer stereolithography for high-frequency applications,” in Proceedings of IEEE Special Issue on Additive Manufacturing of Radio-Frequency Components, vol. 105, no. 4, pp. 645-654, Apr. 2017. DOI: 10.1109/JPROC.2016.2629179.

  2. W. Zhu*, Y. Shen*, and X. Gong, “Ka-band loaded-line phase shifter design on flexible substrate,” in 2014 IEEE AP-S Int. Symp., Memphis, TN, July 6-11, 2014. DOI: 10.1109/APS.2014.6905170.

  3. Y. Shen*, S. Ebadi*, P. Wahid, and X. Gong, “Tunable and flexible Barium Stronium Titante (BST) varactors on Liquid Crystal Polymer (LCP) substrates,” in 2012 IEEE MTT-S Int. Microwave Symp. Dig., Montréal, Canada, June 17-22, 2012. DOI: 10.1109/MWSYM.2012.6259668. (Student Paper Competition Honorable Mention Award out of 351 participants)

  4. T. Price, T. Weller, Y. Shen*, and X. Gong, “Temperature and voltage impact on intermodulation distortion of planar Barium Strontium Titanate varactors,” in 13th IEEE Wireless and Microwave Technology Conference, Cocoa Beach, FL, Apr. 16-17, 2012. DOI: 10.1109/WAMICON.2012.6208466. (Best Student Paper Award)

  5. T. Price, T. Weller, Y. Shen*, and X. Gong, “Comparison of barium Stronium Titanate varactors on magnesium oxide and alumina substrates,” in 12th IEEE Wireless and Microwave Technology Conference, Clear Water, FL, Apr. 18-19, 2011. DOI: 10.1109/WAMICON.2011.5872902.

  6. Z. N. Wing, J. Halloran, X. Gong, W. H. She, E. Hoppenjans, and W. J. Chappell, “Fabrication and properties of an anisotropic TiO2 dielectric composite,” Journal of the American Ceramic Society, vol. 89, no. 9, pp. 2812-2815, Sept. 2006. DOI: 10.1111/j.1551-2916.2006.01134.x.

  7. Y. Huang, X. Gong, T. Bruemmer, S. K. Khanna, and W. J. Chappell, “Magnetically aligned anisotropic conductive adhesive for high-frequency interconnects,” in 2005 IEEE MTT-S Int. Microwave Symp Dig., Long Beach, CA, June 12-17, 2005, DOI: 10.1109/MWSYM.2005.1516754.

  8. Y. Huang, X. Gong, S. Hajela, and W. J. Chappell, “Layer-by-layer stereolithography of three-dimensional antennas,” in 2005 IEEE AP-S Int. Symp., Washington D.C., July 3-8, 2005, vol. 1A, pp. 276-279. DOI: 10.1109/APS.2005.1551302.

Others

  1. M. C. Bailey, R. A. Amarin, J. W. Johnson, P. Nelson*, M. W. James, D. E. Simmons, C. S. Ruf, W. L. Jones, and X. Gong, “Multi-frequency synthetic thinned array antenna for the hurricane imaging radiometer,” IEEE Transactions on Antennas and Propagation, vol. 58, no. 8, pp. 2562-2570, Aug. 2010. DOI: 10.1109/TAP.2010.2050453.

  2. J. Shen, J. Lu*, H. Jia, A. Arias and X. Gong, “On-chip bondwire magnetics with ferrite-epoxy glob coating for power systems on chip (SOC),” International Journal of Power Management Electronics, vol. 2008, Article ID 678415, 9 pages, DOI:10.1155/2008/678415.

  3. J. Li, X. Gong, and S. Cai, “Nondestructive measurement of complex permittivity of substrates by using open-ended waveguide method,” Journal of Microwaves, vol. 15, no. 4, pp. 317-322, Dec. 1999.

  4. J. Li, X. Gong, and S. Cai, “Mixed spectral domain approach analysis of the coupling characteristics of Microshield Line,” Journal of Applied Science, vol. 17, no. 3, pp. 302-308, Sept. 1999.

  5. X. Gong, J. Li, and S. Cai, “Full wave analysis of frequency dependence of microshield line characteristic impedance by mixed spectral domain approach,” Journal of FuDan University, vol. 38, no. 3, pp. 307-311, Jun. 1999.

  6. W. J. D. Johnson, T. Weller, and X. Gong, “Pactive sensors for security applications,” in 14th IEEE Wireless and Microwave Technology Conference, Orlando, FL, Apr. 7-9, 2013. DOI: 10.1109/WAMICON.2013.6572781. (Invited)

  7. F. Liang, J. Zhuge, L. Algozzini, Y. Tang, X. Ren*, K. Lin, J. Gou, X. Gong, and D. Firsich, “Electromagnetic interference shielding and lightning strike protection of carbon nanofiber paper,” Proceedings of 54th International Society for Advancement of Material and Process Engineering (SAMPE) Symposium and Exhibition, Baltimore, MD, May 18-21, 2009.

  8. X. Gong, “Microwave measurement techniques - train professionals with hands-on experience and promote understanding of theory,” in 10th IEEE Wireless and Microwave Technology Conference, Clear Water, FL, Apr. 20-21, 2009, DOI: 10.1109/WAMICON.2009.5207232. (Invited)

  9. E. Ghaneie*, and X. Gong, “A time-domain/frequency-domain simulation tool for microwave component analysis in microwave engineering courses,” in 2008 IEEE AP-S Int. Symp., San Diego, CA, July 5-11, 2008, DOI: 10.1109/APS.2008.4619278.

  10. J. Lu*, H. Jia, A. Arias, X. Gong, and Z. J. Shen, “On-chip bondwire transformers for power SOC applications,” in 23rd Annual IEEE on Applied Power Electronics Conference and Exposition (APEC ’08), Austin, TX, Feb. 24-28, 2008, pp. 199-204, DOI: 10.1109/APEC.2008.4522722.

  11. Z. J. Shen, J. Lu*, X. Cheng, H. Jia, and X. Gong, “On-chip bondwire inductor with ferrite-epoxy beads: a cost-effective approach to realize power systems on chip,” in 38th Annual IEEE Power Electronics Specialists Conference (PESC ’07), Orlando, FL, June 17-21, 2007, pp. 1599-1604. DOI: 10.1109/PESC.2007.4342235.

We are grateful to the support from:

.