IEICE Technical Report

Online edition: ISSN 2432-6380

Volume 126, Number 191

Antennas and Propagation

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Table of contents

AP2026-100
[Poster Presentation] A study on thinning Metasurface Reflector
Naoki Shimizu, Mitoshi Fujimoto (Univ. Fukui), Masaya Todaka, Taiga Matsushita, Yuta Seki (LINTEC)
pp. 1 - 2

AP2026-101
[Poster Presentation] Experimental Evaluation of Interference- and Exposure-Avoidance Microwave Wireless Power Transfer
Shunto Arai, Mao Sekine, Kentaro Murata, Naoki Honma (Iwate Univ.)
p. 3

AP2026-102
[Poster Presentation] Estimation of delay and angle profiles in millimeter-wave band radio wave propagation in urban areas
Daiki Sawaura, Mitoshi Fujimoto (Univ. Fukui), Koshiro Kitao, Satoshi Suyama (NTT DOCOMO)
pp. 4 - 5

AP2026-103
[Poster Presentation] Orbit Analysis for Multi-HAPS MIMO-OFDM Systems
Ryota Takagi, Mitoshi Fujimoto (Fukui Univ), Koyo Tategami, Daisuke Goto, Kiyohiko Itokawa (NTT, Inc.)
pp. 6 - 7

AP2026-104
[Poster Presentation] Design of a Slightly Exposed Underwater Antenna for VHF-Band Microwave Ovens
Jin Kabasawa, Hiroyasu Sato, Chen Qiang (Tohoku Univ.)
pp. 8 - 10

AP2026-105
[Poster Presentation] Position Estimation of Linear Targets Using a Time-Reversal Algorithm Based on Multipath Effects
Uchikoshi Yuki, CHO keizo (CIT)
p. 11

AP2026-106
[Poster Presentation] An Investigation of Input Impedance Characteristics of Multipoint-Fed Circular Microstrip Antennas Using Z-Matrix
Haruto Yamaguchi, Keizo Cho (CIT), Masaya Tateno (Yokowo)
pp. 12 - 13

AP2026-107
[Poster Presentation] Four Elements Pattern Reconfigurable Yagi-Uda Array Antennas Using Magnetic Gear and switching
Shu Yaginuma, Keisuke Konno, Qiang Chen (Tohoku Univ)
pp. 14 - 17

AP2026-108
[Poster Presentation] Research on Base Station Location Optimization Using FMQA
Takuto Ito, Mitoshi Fujimoto (Fukui Univ.), Ryo Yamaguchi, Kazuma Tomimoto, Toshiki Hozen, Shunpei Tabuchi, Shunjiro Hatada (SoftBank)
pp. 18 - 19

AP2026-109
[Poster Presentation] A Study on Eavesdropping Countermeasures for Wireless Physical-Layer Secret Key Agreement in Correlated Channels
Popuri Sakai, Hideichi Sasaoka, Hisato Iwai, Shinsuke Ibi (Doshisha Univ.)
pp. 20 - 21

AP2026-110
[Poster Presentation] Optimization of Base Station-Terminal Pairing in Uplink Communications Using Quantum Annealing
Hiyori Nambu, Mitoshi Fujimoto (Univ.Fukui), Ryo Yamaguchi, Kazuma Tomimoto, Toshiki Hozen, Shunpei Tabuchi, Shujiro Hatada (Softbank)
pp. 22 - 23

AP2026-111
[Poster Presentation] Evaluation of Path Loss Estimation Method Based on Directional Antenna Rotation Measurements in the Sub-THz Band
Takuya Asano, Masato Yomoda, Minseok Kim (NU)
pp. 24 - 29

AP2026-112
[Poster Presentation] UHF-Band RFID Sensing Using Complex Scattered Wave Information from Tags
Eiji Yamazaki, Hiroyasu Sato, Chen Qiang (Tohoku Univ)
pp. 30 - 32

AP2026-113
[Poster Presentation] Design of a Dual-Band Circular Polarization Selective Surface for the Ka Band
Yutaro Tawara, Makoto Sano (YNU)
pp. 33 - 34

AP2026-114
[Poster Presentation] Study on a Reconfigurable Reflectarray Antenna with Sequentially Updated Reflection Phases
Takumi Kojima, Yusuke Maeda, Kosei Kikuchi, Yuki Takeda, Kei Sakamoto, Takashi Tomura (Science Tokyo)
p. 35

AP2026-115
[Poster Presentation] Design Method of Transmitting Antennas Robust against the Position and Orientation of Receiving Antennas
Rei Shoyama, Keisuke Konno, Chen Qiang (Tohoku Univ.)
pp. 36 - 40

AP2026-116
[Poster Presentation] Design of a 28 GHz Patch Array Antenna Using a Miniaturized Butler Matrix
Tatsunori Okimura, Yasutaka Murakami (UEC)
p. 41

AP2026-117
[Poster Presentation] Comparsion of Charasteristics between Coaxial and Planar ULPD Antennas
Yuto Tanaka, Tadashi Takano, Kenji Saegusa, Michio Takikawa (Nihon Univ)
pp. 42 - 43

AP2026-118
[Poster Presentation] Study on Transmission Line Integrated Reconfigurable Intelligent Surfaces
Takahashi Hiroki, Konno Keisuke, Chen Qiang (Tohoku Univ.)
pp. 44 - 46

AP2026-119
[Poster Presentation] Study on Element Arrangement and Radiation Characteristics of a Fan-Shaped Array Antenna
Rikuma Oda, Tadashi Takano, Kenji Saegusa, Michio Takikawa (CST NU)
pp. 47 - 48

AP2026-120
[Poster Presentation] Evaluation of Effects of Leaf and Branch Amounts on Cross-Polarization Characteristics of Tree-Penetrated Waves
Rikuya Ban (Doshisha Univ.), Sigeo Gotoh (Doshisha Univ./Panasonic Electric Works Co., Ltd.), Hisato Iwai, Shinsuke Ibi (Doshisha Univ.)
pp. 49 - 50

AP2026-121
[Poster Presentation] Design of a 300 GHz-Band Broadband Waveguide-to-SIW Transition with a Two-Step and Back-Short Structure
Terumasa Matsuoka, Azuki Iwamoto, Yoshiki Sugimoto, Yuji Tanaka, Kunio Sakakibara (NITech)
pp. 51 - 55

AP2026-122
[Poster Presentation] Study on an Origami Closed-Surface Deployable Transmitarray Antenna Using 5.8-GHz-Band Dual-Layer Transmissive Elements
Takuto Nishioka, Gen Nakayama, Takashi Tomura, Hiraku Sakamoto (Science Tokyo)
p. 56

AP2026-123
[Poster Presentation] Study on a Flexible Reconfigurable Intelligent Surface for Electromagnetic Phantom Applications
Tetsushi Ishida, Yuki Takeda, Takashi Tomura (Science Tokyo), Kentaro Murata (Iwate Univ.)
p. 57

AP2026-124
[Poster Presentation] Evaluation of Primary Satellite Configuration and Directivity in Multi-User Communication Using Feederless Active Phased Array in Satellite Formation Flying
Kiyoto Saito, Yuto Ozawa, Kentaro Murata, Naoki Honma (Iwate Univ.), Atsushi Shirane (Science Tokyo), Shutai Okamura (IST), Sumio Morioka (IST/UOsaka)
p. 58

AP2026-125
[Poster Presentation] A consideration on design of an 8x8-element array with a single-layer dual-band and wideband microstrip antenna fed by an L-probe for 28 GHz and 39 GHz bands
Tomoya Obinata, Yuichi Kimura (Saitama Univ.), Takuji Arima (TUAT)
pp. 59 - 62

AP2026-126
[Poster Presentation] A consideration on a radiation element for a circularly-polarized planar array on the broad wall of a rectangular waveguide
Masaki Ishikawa, Yuichi Kimura (Saitama Univ.)
pp. 63 - 68

AP2026-127
[Poster Presentation] Outdoor Path-Loss Estimation Using Anisotropic Gaussian Process Regression Across Different Building Environments
Shogo Tanimoto, Miyuki Hirose (Kyutech)
p. 69

AP2026-128
[Poster Presentation] AI-Optimized Advanced Antenna Pattern Multiplexing and Its Experimental Validation in MIMO Systems
Anand Mohan Gupta, Masato Saito (Univ. Ryukyus)
p. 70

AP2026-129
[Poster Presentation] A Study on Dynamic Optimization Based on User Distribution Predictions
Takuro Maeda, Mitoshi Fujimoto (Fukui Univ.), Koshiro Kitao, Satoshi Suyama (NTTDOCOMO)
pp. 71 - 72

AP2026-130
[Poster Presentation] Esitimation of Arrival Direction for In-Vehicle Biometric Detection Using Millimeter-Wave MIMO Rader
Kazuki Izumoto, Mitoshi Fujimoto (Univ. Fukui)
pp. 73 - 74

AP2026-131
[Poster Presentation] Fundamental Evaluation of SDR-Based Two-Tone Two-Way Inter-Satellite Ranging for Large-Aperture Phased Arrays in Formation Flying
Ren Masuda, Koki Hirai, Yuxuan Ding, Minseok Kim (NU), Sumio Morioka (IST/UOsaka), Shutai Okamura (IST)
pp. 75 - 80

AP2026-132
[Poster Presentation] Heating Characteristics of Saline Water Using VHF-Band Radiowave Ovens
Mingyu Han, Hiroyasu Sato, Qiang Chen (Tohoku Univ.)
pp. 81 - 83

AP2026-133
[Poster Presentation] Study on foldable reflectarray antennas using woven membrane with beam scanning and non-planarity compensation
Yusuke Maeda, Takumi Kojima, Kosei Kikuchi, Yuki Takeda, Hiraku Sakamoto, Takashi Tomura (Science Tokyo)
p. 84

AP2026-134
[Poster Presentation] Study on Rotatable Reconfigurable Reflectarray Antennas Using Magnetic Gears
Haoru Mao, Keisuke Konno, Qiang Chen (Tohoku Univ.)
pp. 85 - 87

AP2026-135
[Poster Presentation] A Study of Superconducting Radial-Line Slot Antennas in the 140 GHz Band
Rui Okochi, Gen Nakayama, Takashi Tomura (Science Tokyo), Keita Sakuma, Naoto Sekiya (Univ. of Yamanashi)
p. 88

AP2026-136
[Poster Presentation] Measurement-Calibrated Radio Digital Twin from Video-Based 3D Scene Reconstruction
Tianhang Shen, Minseok Kim (Niigata Univ.)
pp. 89 - 94

AP2026-137
[Poster Presentation] Investigation of Equivalent Transmitter Placement Methods for a Simplified Simulation Model of a Metamaterial-Based Electromagnetic Scattering Sheet
Takumu Amemeiya, Yasutaka Murakami (UEC/NICT), Jerdvisanop Chakarothai, Katsumi Fujii (NICT)
pp. 95 - 96

AP2026-138
[Poster Presentation] Effect of Input Map Images on Delay Characteristic Estimation Using Machine Learning
Sena Komyo, Kiyoaki Itoi, Hiroaki Nakabayashi (Chiba inst. of Tech)
p. 97

AP2026-139
[Poster Presentation] Multi-User Communications with User Fairness and Sum-Rate Optimization Using a Feederless Active Phased Array in Formation Flying
Yuto Ozawa, Kentaro Murata, Naoki Honma (Iwate Univ.), Atsushi Shirane (Science Tokyo), Shutai Okamura (IST), Sumio Morioka (Osaka Univ./IST)
p. 98

AP2026-140
[Poster Presentation] A Study on an Automatic Placement Algorithm and the Communication Area Extension Effect in Dynamic Passive RIS
Ryoga Ito, Kiyoaki Itoi, Hiroaki Nakabayashi (Chiba inst. tech.)
p. 99

AP2026-141
[Poster Presentation] Study of Meta-surface reflector realizing wide angle reflection
Daichi Tanaka, Kenji Saegusa, Michio Takikawa (Nihon Univ)
pp. 100 - 101

AP2026-142
[Poster Presentation] A Study on Installation Angle of a Metal Reflector for Millimeter-Wave Coverage Extension
Haru Shirahama (Doshisha Univ.), Satoru Shimizu (Doshisha Univ./ATR), Hisato Iwai, Shinsuke Ibi (Doshisha Univ.)
pp. 102 - 103

AP2026-143
[Poster Presentation] A Study of Received Level Estimation Using Cluster-Based Kriging
Takafumi Watanabe, Hiroaki Nakabayashi (Chiba Tech)
p. 104

AP2026-144
[Poster Presentation] Investigation into the Feasibility of Chebyshev Characteristics for Circular Aperture Array Antennas
Kazuki Yamada, Tadashi Takano, Kenji Saegusa, Takikawa Michio (Nihon Univ.)
pp. 105 - 106

AP2026-145
[Poster Presentation] Comparison of Grating Lobe Levels in Aperiodic Array Antennas Using Seven Types of Einstein Tile
Tomoyoshi Sugaya, Kenji Saegusa, Michio Takikawa (Nichidai)
pp. 107 - 108

AP2026-146
[Poster Presentation] Low-Spillover Design of 300-GHz-Band Dielectric Lens Antenna Using Two Slots Excited by Single Feed in Multilayer Substrate
Hayato Mori, Soma Sito, Yoshiki Sugimoto, Yuji Tanaka, Kunio Sakakibara (NITech)
pp. 109 - 113

AP2026-147
[Poster Presentation] Life-Emulating Intelligent Electromagnetic Phantom for OTA Testing of MIMO-Doppler Radar -- Reproduction of Spatiotemporal Radar Target Responses through Channel Reconstruction --
Motoki Narusawa, Haruki Shibasaki, Yuto Ozawa, Kentaro Murata, Naoki Honma (Iwate Univ.), Takashi Tomura (Science Tokyo)
p. 114

AP2026-148
[Poster Presentation] A consideration on an 8x8-element wideband planar array with single-layer microstrip antennas fed by an L-probe
Tomoki Ishikawa, Yuichi Kimura (Saitama Univ.)
pp. 115 - 120

AP2026-149
[Poster Presentation] Phase Error Correction Method Using Only Ground Station Received Power for Feederless Active Phased Arrays in Satellite Formation Flying
Ryogo Miura, Yuto Ozawa, Shunto Arai, Naoki Honma, Kentaro Murata (Iwate Univ.), Atsushi Shirane (Science Tokyo), Sumio Morioka (Interstellar Technologies Inc./The Univ. of Osaka)
p. 121

AP2026-150
[Poster Presentation] Wireless Coverage Optimization in Three-Dimensional Space Using Quantum Annealing
Mahiro Yuki, Miyuki Hirose (Kyutech)
p. 122

AP2026-151
[Poster Presentation] Human Identification Method Using Amplitude-Only SISO-CSI Among Multiple Wi-Fi Devices
Kenta Watanabe, Daiki Nagao, Naoki Honma, Kentaro Murata (Iwate Univ.), Takeshi Nakayama, Shoichi Iizuka, Ryosuke Otomura (Panasonic)
pp. 123 - 124

AP2026-152
[Poster Presentation] Impact of Human Body Shape Models on the 1st Fresnel-Zone-Aware LOS Probability Estimation
Minori Kuno, Kota Kashiwazaki, Naoki Kita (Tokyo Denki Univ.), Wataru Yamada (NTT)
p. 125

AP2026-153
[Poster Presentation] Path-Loss Estimation Using Graph Representations of Urban Environments
Kosuke Nakamitsu (KIT), Satoshi Iwasaki, Kenshi Horihata (KKE), Miyuki Hirose (KIT)
p. 126

AP2026-154
[Poster Presentation] Study on Multi-Band Planar Receiving Antennas for HAPS and Low Earth Orbit Satellite Systems
Minao Tokashiki, Masato Saito (Univ. Ryukyus)
p. 127

AP2026-155
[Poster Presentation] Indoor Radio Map Estimation via Few-Shot Learning Using Building Layouts
So Okada, Koichi Ichige (Yokohama National Univ.), Hiroki Aoki, Hironobu Yamamoto, Yoshiaki Amano (KDDI Research, Inc.)
pp. 128 - 133

AP2026-156
Development of a Multi-Channel SDR-Based System for Transmit Directivity Control
Shujiro Hatada, Kazuma Tomimoto, Shumpei Tabuchi, Toshiki Hozen, Ryo Yamaguchi (SoftBank)
pp. 134 - 139

AP2026-157
CARTHER: Catch and Release the Radio
Kentaro Murata, Shunto Arai, Keisei Omi, Motoki Narusawa, Naoki Honma (Iwate Univ.)
pp. 140 - 143

AP2026-158
Angle‐Interpretable Weighted Fusion of Multilink Micro‐Doppler Features for Human Activity Recognition
Yupeng Wang, Keita Nishi, Mio Yamamoto, Minseok Kim (Niigata Univ.)
pp. 144 - 149

AP2026-159
Study on Indoor Communication Ray-Tracing Analysis Using BIM Model
Takaaki Nishino, Takehiro Tsuruta, Kazuaki Takane (Takenaka), Hidetaka Nishihara (NTT EAST), Koshiro Miyamoto (NTT ME), Daisuke Nakajima, Mai Imaoka (Asahi Facilities)
pp. 150 - 153

AP2026-160
Considerations on Antenna Feed Structures and Input Impedance Characteristics in FDTD Analysis
Taishi Kiyokawa, Yiwei He (Osaka Electro-Communication Univ.)
pp. 154 - 159

AP2026-161
Experimental evaluation of wide-angle beam-steering circularly polarized reflectarray antennas
Makoto Sano (Yokohama National Univ.)
pp. 160 - 164

Note: Each article is a technical report without peer review, and its polished version will be published elsewhere.