Journal papers

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  1. Q. Li, J. Hirokawa, T. Tomura, and N. Fonseca, “Two-dimensional one-body 3×3-way hollow-waveguide nolen matrix using a two-plane unequal division coupler,” IEEE Trans. Microw. Theory Techn., vol. 72, no. 1, pp. 376-390, Jan. 2024. [ DOI ]
  2. Y. Wu, J. Hirokawa, and T. Tomura, “A perpendicular-corporate-feed parallel-plate slot array antenna by H-plane groove gap waveguides with interlaced triangular pins,” IEEE Trans. Antennas Propag., vol. 72, no. 1, pp. 1033-1038, Jan. 2024. [ DOI ]
  3. X. Fu, D. You, X. Wang, Y. Wang, C. J. Mayeda, Y. Gao, M. Ide, Y. Zhang, J. Sakamaki, A. A. Fadila, Z. Li, J. Sudo, M. Higaki, S. Inoue, T. Eishima, T. Tomura, J. Pang, H. Sakai, K. Okada, and A. Shirane, “A low-power 256-element Ka-band CMOS phased-array receiver with on-chip distributed radiation sensors for small satellite constellations,” IEEE J. Solid-State Circuits, vol. 58, no. 12, pp. 3380-3395, Dec. 2023. [ DOI ]
  4. S. WU, J. Hirokawa, T. Tomura, and N. Fonseca, “Optimal adjacent output phase difference assignments in one-dimensional parallel switching matrices with four beams,” IEEE J. Microw., vol. 3, no. 4, pp. 1199-1211, Oct. 2023. [ DOI ]
  5. M. K. Emara, T. Tomura, J. Hirokawa, and S. Gupta, “Metallo-dielectric millimeter-wave Huygens' quarter-wave and half-wave plates,” IEEE Trans. Antennas Propag., vol. 71, no. 8, pp. 6678-6687, Aug. 2023. [ DOI ]
  6. H. Xiong, J. Hirokawa, and T. Tomura, “A center-fed dual-polarized parallel-plate waveguide slot array antenna based on a feeding waveguide with centered longitudinal feeding slots,” IEEE Access, vol. 11, pp. 93793 - 93803, Aug. 2023. [ DOI ]
  7. T. Wang, T. Tomura, J. Hirokawa, B. Pyne, P. R. Akbar, and H. Saito, “A feeding network with collinearly centered longitudinal coupling slots for a rectangular parallel-plate slot array antenna,” IEEE Trans. Antennas Propag., vol. 71, no. 7, pp. 5838-5849, Jul. 2023. [ DOI ]
  8. Y. Wu, T. Tomura, J. Hirokawa, and M. Zhang, “A wideband full-metal sidewall-loaded magnetoelectric dipole array based on combined ridge and groove gap waveguide in the Q band,” IEEE Trans. Antennas Propag., vol. 71, no. 7, pp. 6156-6161, Jul. 2023. [ DOI ]
  9. Q. Li, J. Hirokawa, T. Tomura, Y. Takahashi, N. Kita, and N. J. G. Fonseca, “A two-dimensional 6 × 4-way hollow waveguide beam-switching matrix,” IEEE Access, pp. 74239 - 74249, Jul. 2023. [ DOI ]
  10. Q. Li, J. Hirokawa, and T. Tomura, “Two-plane waveguide coupler with arbitrary coupling ratios in the H-plane and E-plane directions,” IET Microw. Antennas Propag., vol. 17, no. 10, pp. 818-826, Jul. 2023. [ DOI ]
  11. Y. Akamine, T. Tomura, and J. Hirokawa, “Single-cut scattered field transformation applicable for differences in the radar ranges of transmitter and receiver,” IEEE Trans. Antennas Propag., vol. 71, no. 6, pp. 5310-5321, Jun. 2023. [ DOI ]
  12. S. Chen, T. Tomura, J. Hirokawa, K. Itou, M. Suga, Y. Shirato, D. Uchida, and N. Kita, “Design for operation in two frequency bands by division of the coupled region in a waveguide 2-plane coupler,” IEICE Trans. Electron., vol. E105-C, no. 12, pp. 729-739, Dec. 2022. [ DOI ]
  13. Y. Sunaguchi, T. Tomura, and J. Hirokawa, “Control of radiation direction in an aperture array excited by a waveguide 2-plane hybrid coupler,” IEICE Trans. Commun., vol. E105-B, no. 8, pp. 906-912, Aug. 2022. [ DOI ]
  14. S. Ji, T. Tomura, and J. Hirokawa, “A wideband and high-gain all-metallic perpendicular-corporate-fed multi-layered parallel-plate slot array antenna,” IEEE Access, vol. 10, pp. 38000-38011, Apr. 2022. [ DOI ]
  15. S. Ji, T. Tomura, and J. Hirokawa, “Fast analysis and bandwidth enhancement of the radiating subarray by method of moments for a parallel-plate slot array antenna with perpendicular-corporate feed,” IEEE Trans. Antennas Propag., vol. 70, no. 4, pp. 2645-2655, Apr. 2022. [ DOI ]
  16. T. Tomura, J. Hirokawa, M. Ali, and G. Carpintero, “Millimeter-wave multiplexed wideband wireless link using rectangular-coordinate orthogonal multiplexing (ROM) antennas,” J. Lightw. Technol., pp. 7821-7830, Dec. 2021. [ DOI ]
  17. A. Hirata, K. Itakura, T. Higashimoto, Y. Uemura, T. Nagatsuma, T. Tomura, J. Hirokawa, N. Sekine, I. Watanabe, and A. Kasamatsu, “Transmission characteristics control of 120 GHz-band bandstop filter by coupling alignment-free lattice pattern,” IEICE Trans. Electron., vol. E104-C, no. 10, pp. 1745-1353, Oct. 2021. [ DOI ]
  18. S. Sakurai, J. G. N. Rahmeier, T. Tomura, J. Hirokawa, and S. Gupta, “Millimeter-wave Huygens' transmit-arrays based on coupled metallic resonators,” IEEE Trans. Antennas Propag., vol. 69, no. 5, pp. 2686-2696, May 2021. [ DOI ]
  19. K. Omoto, T. Tomura, and H. Sakamoto, “Proof-of-concept on misalignment compensation for 5.8-GHz-band reflectarray antennas by varactor diodes,” IEEE Access, vol. 9, pp. 54101-54108, Apr. 2021. [ DOI ]
  20. N. J. G. Fonseca, S. Gomanne, P. Castillo-Tapia, O. Quevedo-Teruel, T. Tomura, and J. Hirokawa, “Connecting networks for two-dimensional butler matrices generating a triangular lattice of beams,” IEEE J. Microw., vol. 1, no. 2, pp. 646-658, Apr. 2021. [ DOI ]
  21. K. Itakura, A. Hirata, M. Sonoda, T. Higashimoto, T. Nagatsuma, T. Tomura, J. Hirokawa, N. Sekine, I. Watanabe, and A. Kasamatsu, “Control of 120-GHz-band split ring resonator filter by coupling lattice pattern substrate,” IEICE Trans. Electron., vol. E104-C, no. 3, pp. 102-111, Mar. 2021. [ DOI ]
  22. T. Tomura, J. Hirokawa, M. Furukawa, T. Fujiwara, and N. Shinohara, “Eight-port feed radial line slot antenna for wireless power transmission,” IEEE Open J. Antennas Propag., vol. 2, pp. 170-180, Feb. 2021. [ DOI ]
  23. T. Tomura and J. Hirokawa, “Anisotropic conductivity measurements by two kinds of multimode rectangular plate-laminated cavities,” IEEE Trans. Microw. Theory Techn., pp. 170-178, 2021. [ DOI ]
  24. M. K. Emara, T. Tomura, J. Hirokawa, and S. Gupta, “All-dielectric Fabry-Perot based compound Huygens' structure for millimeter-wave beam-forming,” IEEE Trans. Antennas Propag., pp. 1784-1788, 2021. [ DOI ]
  25. M. K. Emara, T. Tomura, J. Hirokawa, and S. Gupta, “Fabry-Perot based compound all-dielectric Huygens' structure for circularly-polarized millimeter-wave beamforming,” IEEE Antennas Wireless Propag. Lett., vol. 19, no. 10, pp. 1784-1788, Oct. 2020. [ DOI ]
  26. T. Ruckkwaen, T. Tomura, K. Araki, J. Hirokawa, and M. Ando, “Experimental evaluation of intersymbol interference in non-far region transmission using a large array antenna in the millimeter wave band,” IEICE Trans. Commun., vol. E103-B, no. 10, pp. 1136-1146, Oct. 2020. [ DOI ] [PDF]
  27. K. Wada, T. Tomura, and J. Hirokawa, “Dual-polarized two-dimensional beam mode orthogonal multiplexing antenna system for the non-far region,” IEEE Trans. Antennas Propag., vol. 68, no. 9, pp. 6614-6623, Sep. 2020. [ DOI ]
  28. M. K. Emara, S. K. Stuhec-Leonard, T. Tomura, J. Hirokawa, and S. Gupta, “Laser-drilled all-dielectric Huygens’transmit-arrays as 120 GHz band beamformers,” IEEE Access, vol. 8, pp. 153815-153825, Sep. 2020. [ DOI ]
  29. H. Arakawa, T. Tomura, and J. Hirokawa, “Sidelobe suppression in both the e and h planes using slit layers over a corporate-feed waveguide slot array antenna consisting of 2×2-element radiating units,” IEICE Trans. Commun., vol. E103-B, no. 9, pp. 960-968, Sep. 2020. [ DOI ] [PDF]
  30. K. Ikeya, H. Sakamoto, H. Nakanishi, H. Furuya, T. Tomura, R. Ide, R. Iijima, Y. Iwasaki, K. Ohno, K. Omoto, T. Furuya, T. Hayashi, M. Kato, S. Koide, M. Kurosaki, Y. Nakatsuka, S. Okuyama, R. Kashiyama, J. Nakamura, W. Nio, T. Tsunemitsu, Y. Yamazaki, K. Taga, B. Hohmann, T. Amamoto, T. Chubachi, S. Tamura, H. Okada, A. Watanabe, N. Kawabata, T. Hori, H. Ito, T. Kuratomi, Y. Shimoda, N. Hidaka, K. Watanabe, A. Torisaka, and M. Yamazaki, “Significance of 3U CubeSat OrigamiSat-1 for space demonstration of multifunctional deployable membrane,” Acta Astronautica, vol. 173, pp. 363-377, Aug. 2020. [ DOI ]
  31. B. Pyne, H. Saito, P. R. Akbar, J. Hirokawa, T. Tomura, and K. Tanaka, “Development and performance evaluation of small SAR system for 100kg class satellite,” IEEE J. Sel. Topics Appl. Earth Observ., vol. 13, pp. 3879-3891, Jul. 2020. [ DOI ]
  32. A. Gomez-Torrent, T. Tomura, W. Kuramoto, J. Hirokawa, I. Watanabe, A. Kasamatsu, and J. Oberhammer, “A 38 dB gain, low-loss, flat array antenna for 320–400 GHz enabled by silicon-on-insulator micromachining,” IEEE Trans. Antennas Propag., vol. 68, no. 6, pp. 4450-4458, Jun. 2020. [ DOI ]
  33. T. Tomura, Y. Saito, and J. Hirokawa, “8×2-element 60-GHz-band circularly polarized post-wall waveguide slot array antenna loaded with dipoles,” IEEE Access, vol. 8, pp. 85950-85957, May 2020. [ DOI ]
  34. R. Ohashi, T. Tomura, and J. Hirokawa, “Transmission enhancement in rectangular-coordinate orthogonal multiplexing by excitation optimization of slot arrays for a given distance in the non-far region communication,” IEICE Trans. Commun., vol. E103-B, no. 2, pp. 130-138, Feb. 2020. [ DOI ] [PDF]
  35. N. Matsumura, K. Nishimori, R. Taniguchi, T. Hiraguri, T. Tomura, and J. Hirokawa, “Novel unmanned aerial vehicle based line-of-sight MIMO configuration independent of transmitted distance using millimeter wave,” IEEE Access, vol. 8, pp. 11679-11691, Jan. 2020. [ DOI ]
  36. T. Tomura, D. Kim, M. Wakasa, Y. Sunaguchi, J. Hirokawa, and K. Nishimori, “A 20-GHz-band 64×64 hollow waveguide two-dimensional Butler matrix,” IEEE Access, vol. 7, pp. 164080-164088, Nov. 2019. [ DOI ]
  37. H. Arakawa, H. Irie, T. Tomura, and J. Hirokawa, “Suppression of E-plane sidelobes using double slit-layers in a corporate-feed waveguide slot array antenna consisting of 2×2-element radiating units,” IEEE Trans. Antennas Propag., vol. 67, no. 6, pp. 3743-3751, Jun. 2019. [ DOI ]
  38. M. Wakasa, D. Kim, T. Tomura, and J. Hirokawa, “Wideband design of a short-slot 2-plane coupler by the mode matching/FEM hybrid analysis considering the structural symmetry,” IEICE Trans. Commun., vol. E102-B, no. 5, pp. 1019-1026, May 2019. [ DOI ] [PDF]
  39. T. Tomura, H. Hirayama, and J. Hirokawa, “A PCB-integratable metal cap slot antenna for 60-GHz band mobile terminals,” IEICE Trans. Commun., vol. E102-B, no. 2, pp. 317-323, Feb. 2019. [ DOI ] [PDF]
  40. H. Irie, T. Tomura, and J. Hirokawa, “Perpendicular-corporate feed in a four-layer circularly-polarized parallel-plate slot array,” IEICE Trans. Commun., vol. E102-B, no. 1, pp. 137-146, Jan. 2019. [ DOI ]
  41. X. Cheng, Y. Yao, T. Tomura, J. Hirokawa, T. Yu, J. Yu, and X. Chen, “A compact multi-beam end-fire circularly polarized septum antenna array for millimeter-wave applications,” IEEE Access, vol. 6, pp. 62784-62792, Dec. 2018. [ DOI ]
  42. X. Cheng, Y. Yao, J. Hirokawa, T. Tomura, T. Yu, J. Yu, and X. Chen, “Analysis and design of a wideband end-fire circularly polarized septum antenna,” IEEE Trans. Antennas Propag., vol. 66, pp. 5783-5793, Nov. 2018. [ DOI ]
  43. T. Nagayama, S. Akiba, T. Tomura, and J. Hirokawa, “Photonics-based millimeter-wave band remote beamforming of array-antenna integrated with photodiode using variable optical delay line and attenuator,” J. Lightw. Technol., vol. 36, no. 19, pp. 4416-4422, Oct. 2018. [ DOI ]
  44. X. Cheng, Y. Yao, T. Tomura, J. Hirokawa, T. Yu, J. Yu, and X. Chen, “Millimeter-wave frequency beam scanning array with a phase shifter based on substrate-integrated-waveguide,” IEEE Access, vol. 6, pp. 47408-47414, Aug. 2018. [ DOI ]
  45. T. Tomura, M. Takikawa, Y. Inasawa, and H. Miyashita, “Simultaneous optimal design method of primary radiator and main reflector for shaped beam antennas,” IEICE Trans. Commun., vol. E100-B, no. 2, pp. 211-218, Feb. 2017. [ DOI ]
  46. T. Tomura, J. Hirokawa, T. Hirano, and M. Ando, “A 45o linearly polarized hollow-waveguide 16×16-slot array antenna covering 71-86 GHz band,” IEEE Trans. Antennas Propag., vol. 62, no. 10, pp. 5061-5067, Oct. 2014. [ DOI ]
  47. T. Tomura, J. Hirokawa, T. Hirano, and M. Ando, “A wideband 16×16-element corporate-feed hollow-waveguide slot array antenna in the 60-GHz band,” IEICE Trans. Commun., vol. E97-B, no. 4, pp. 798-806, Apr. 2014. [ DOI ]
  48. T. Tomura, Y. Miura, M. Zhang, J. Hirokawa, and M. Ando, “A 45o linearly polarized hollow-waveguide corporate-feed slot array antenna in the 60-GHz band,” IEEE Trans. Antennas Propag., vol. 60, no. 8, pp. 3640-3646, Aug. 2012. [ DOI ]

Letters

  1. J. Shuang, J. Hirokawa, T. Tomura, and H. Saito, “X-band grating-loaded parallel-plate slot array antenna with low reflection,” IEICE Commun. Express, vol. X12-B, no. 6, pp. 277-281, Jun. 2023. [ DOI ]
  2. M. Machida, R. Mizokuchi, J. Yoneda, T. Tomura, and T. Kodera, “Mixed-mode rf reflectometry of quantum dots for reduction of crosstalk effects,” Japanese Journal of Applied Physics, vol. 62, no. SC, p. SC1086, Mar. 2023. [ https://dx.doi.org/10.35848/1347-4065/acbb0e [ DOI | http ]
  3. T. Ruckkwaen, T. Tomura, and J. Hirokawa, “Short-range transmission improvement by dog-bone cross-slot feed in radial line slot antenna,” IEICE Commun. Express, vol. 11, no. 6, pp. 257-262, Jun. 2022. [ DOI ]
  4. K. Jitosho, T. Tomura, and J. Hirokawa, “Improvement of isolation between transmitting and receiving antennas of E-plane arranged waveguide slot arrays by using layers of slit pairs with half-wavelength spacing,” IEICE Commun. Express, vol. 10, no. 2, pp. 93-98, Feb. 2021. [ DOI ]
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