Zobrazeno 1 - 10
of 622
pro vyhledávání: '"Hisamatsu Nakano"'
Publikováno v:
Applied Sciences, Vol 14, Iss 16, p 6997 (2024)
Two concentric double-loop antennas were analyzed using the moment method to increase the 3 dB axial ratio bandwidth. Each antenna has a driven loop connected to a branched feedline that is vertical to the ground plane. First, a parasitic loop was ad
Externí odkaz:
https://doaj.org/article/700c0d63e33a423d985469d5a05eb43f
A Simultaneous Study on Wire-Loop, Plate-Loop, and Plate Antennas for Wideband Circular Polarization
Publikováno v:
International Journal of Antennas and Propagation, Vol 2024 (2024)
We investigate three square-shaped antennas to increase the bandwidth of circular polarization. Each antenna has two adjacent corners excited with the same amplitudes and a phase difference of 90° using a branched feedline vertical to the ground pla
Externí odkaz:
https://doaj.org/article/c2f310b611a04aa0bacfc74b437be6de
Autor:
Masahiro Tanabe, Hisamatsu Nakano
Publikováno v:
IET Microwaves, Antennas & Propagation, Vol 17, Iss 5, Pp 392-402 (2023)
Abstract A low‐profile spiral antenna with three stopbands (2.55 GHz band, 3.85 GHz band, and 5.45 GHz band) is developed. The stopbands are generated using three pairs of slots cut into the spiral arms. The antenna height is 0.077 wavelength at a
Externí odkaz:
https://doaj.org/article/9a92e4397d3645f892179247bb98e03a
Publikováno v:
Electronics Letters, Vol 59, Iss 22, Pp n/a-n/a (2023)
Abstract Using the moment method, two array antennas are investigated to reveal the effects of different radiation elements on the array characteristics. Each array comprises four elements sequentially rotated by 90° and excited by a coplanar C‐fi
Externí odkaz:
https://doaj.org/article/7650ab4c9c0247b09302644ebb2f374b
Autor:
Benjamin J. Falkner, Hengyi Zhou, Wei Zhang, Georgios Metaxas, Amit Mehta, Volker Ziegler, Thomas Multerer, Dariush Mirshekar-Syahkal, Hisamatsu Nakano
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-13 (2022)
Abstract A low profile wideband spiral antenna array is presented for global mid-band 5G beam steering applications. In the global rollout of mid-band 5G, different frequencies have been licensed within each region (e.g. 3.4–3.8 GHz in the EU and 3
Externí odkaz:
https://doaj.org/article/8aaafdfabc03414597eeed2d8df1cff5
Publikováno v:
Electronics Letters, Vol 59, Iss 8, Pp n/a-n/a (2023)
Abstract The authors propose a novel dual‐wire antenna with a balanced feed to increase a 3‐dB axial ratio bandwidth. The antenna comprises loop elements with quasi two‐sources, and the effects of the element distance on the axial ratio bandwid
Externí odkaz:
https://doaj.org/article/435dc5ebf7f844ec9c3c746341303e9a
Publikováno v:
IEEE Access, Vol 10, Pp 73317-73325 (2022)
A circularly polarized (CP), small, beam-steerable antenna is realized using bent metalines. The antenna has the following features: 1) dual-band operation at low frequency $f_{\mathrm {LOW}}$ (wavelength $\lambda _{\mathrm {LOW}}$ ) and at high freq
Externí odkaz:
https://doaj.org/article/f3d581080b0f4d49911b1533c8fb7b61
Publikováno v:
IEEE Access, Vol 10, Pp 24-33 (2022)
A beam-forming system for a patch antenna is proposed to realize a deeply tilted beam with high-gain, high aperture efficiency, and low sidelobe level. The proposed system uses only one novel metaplate, where the total system height is less than one
Externí odkaz:
https://doaj.org/article/4ed4ba546818447883166fba9f50d829
Autor:
Nikolay Litov, Ben Falkner, Hengyi Zhou, Amit Mehta, Wezi Gondwe, Dushmantha N. Thalakotuna, Dariush Mirshekar-Syahkal, Karu Esselle, Hisamatsu Nakano
Publikováno v:
IEEE Access, Vol 10, Pp 17897-17907 (2022)
A novel, low cost, highly accurate, millimeter-wave RCS characterization method is developed and presented in this paper. In order to develop and verify the validity of the proposed method, full scale models and scale models of the horizontal-axis wi
Externí odkaz:
https://doaj.org/article/7c4e17d0ebd645119c48ec9ec51619d7
Publikováno v:
Electronics Letters, Vol 59, Iss 1, Pp n/a-n/a (2023)
Abstract The finite‐difference time‐domain (FDTD) method based on the iterated Crank–Nicolson (ICN) scheme is extended to a frequency‐dependent version. The Drude model is used to express a metal dispersion, which is incorporated into the ite
Externí odkaz:
https://doaj.org/article/54b2559d20384fb9b7901d5a76e42344