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Author

Keisuke Fujita

Observed name: Keisuke FUJITA
ORCID: 0000-0002-4002-6358
Observed ORCID: 0000-0002-4002-6358
OpenAlex ID: A5046681752
Theoretical Limitation of the Radiation Efficiency for Homogenous Electrically Small Antennas
2015 · Keisuke FUJITA, Hiroshi SHIRAI · IEICE Transactions on Electronics · 13
Theoretical Limit of the Radiation Efficiency for Electrically Small Self-Resonant Spherical Surface Antennas
2016 · Keisuke FUJITA, Hiroshi SHIRAI · IEICE Transactions on Electronics · 8
A study of the antenna radiation efficiency for electrically small antennas
2013 · Keisuke Fujita, Hiroshi Shirai · Digest - IEEE Antennas and Propagation Society. International Symposium · 6
Effective Q factor formula for small spherical surface antennas
2020 · Keisuke Fujita · IEICE Communications Express · 4
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Wideband Spherical Helix Antenna with Multi-mode Excitation
2023 · Takuma Shimada, Mina Nishie, et al. · URSI General Assembly and Scientific Symposium · 2
Effective Q factor for spherical surface antennas
2018 · Keisuke Fujita · International Workshop on Antenna Technology · 2
Impact of Loss Resistance on the Radiation Efficiency of Small Antennas Excited by Folded Structure
2025 · Daiki Miyamori, Keisuke Noguchi, et al. · 1
Modified Wheeler cap method using a quarter-wave transformer
2023 · Kouta Chiba, Keisuke Fujita · URSI General Assembly and Scientific Symposium · 1
Closed-Form Expression of Radiation Characteristics for Electrically Small Spherical Helix Antennas
2022 · Keisuke FUJITA, Keisuke NOGUCHI · IEICE Transactions on Communications · 1
Bandwidth of Radiation Efficiency for Electrically Small Antennas Excited by a Folded Structure
2026 · Keisuke Noguchi, Daiki Miyamori, et al. · IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)
Compact Multiresonance Cubic Antenna Combining Complementary Series- and Parallel-resonant Elements
2026 · Touma Kaneda, Hiroaki Hayashi, et al. · IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)
Two Types of Bandwidth Evaluation of Crossed Spherical Helix Antennas Using Numerical Simulation
2024 · Takuma Shimada, Mina Nishie, et al. · IEICE Communications Express
Modal Current Distribution for Electrically Small Spherical Helix Antenna
2023 · Keisuke Fujita · IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)
Significance of the Higher-order Modes to the Near-field Calculation of the Spherical Helix Antennas
2022 · Keisuke Fujita · IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)
A simplified expression on the radiation characteristics of small spherical helix antennas
2021 · Keisuke Fujita · IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)
Research on optimal small antennas using the spherical wave expansion
2020 · Keisuke Fujita · IEICE Technical Report; IEICE Tech. Rep.
Excitation of Eigenmode Current for Multiple Resonance Antenna
2019 · Keisuke Fujita · URSI International Symposium on Electromagnetic Theory
Elliptically Polarized Compact Cylinder-Spiral Antenna
2018 · Keisuke Fujita · IEEE Conference on Antenna Measurements & Applications
Radiation efficiency of multi-arm open-ended spherical helix antennas
2016 · Keisuke Fujita, Hiroshi Shirai · International Symposium on Antennas and Propagation
A Study on Radiation Characteristics for Electrically Small Spherical Conducting Shell Antennas
2015 · Keisuke Fujita, Hiroshi Shirai · IEICE Technical Report; IEICE Tech. Rep.
Theoretical study on the radiation efficiency of electrically small and thin spherical shell antennas
2015 · Keisuke Fujita, Hiroshi Shirai · URSI Atlantic Radio Science Conference
On the radiation efficiency of homogeneous antennas
2014 · Keisuke Fujita, Hiroshi Shirai · International Symposium on Antennas and Propagation
Works count: 22
Citation count: 38
H-index: 4
I10-index: 1
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