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Papers by Hisamatsu Nakano

Research paper thumbnail of Fan-shaped antennas: Realization of wideband characteristics and generation of stop bands

Research paper thumbnail of Low-Profile Dual-Loop Antennas With a Straight Wire for Circular Polarization

IEEE Antennas and Wireless Propagation Letters, 2013

ABSTRACT

Research paper thumbnail of Efficient implementation of frequency-dependent 3D LOD-FDTD method using fundamental scheme

Electronics Letters, 2012

Research paper thumbnail of An integral equation and its application to spiral antennas on semi-infinite dielectric materials

IEEE Transactions on Antennas and Propagation, 1998

Research paper thumbnail of Reformulation of the ADI-BPM using a fundamental scheme

IEICE Electronics Express, 2012

Research paper thumbnail of An extremely low-profile helical array antenna

International Symposium on Antennas and Propagation Society, Merging Technologies for the 90's

An extremely-low-profile helical array antenna has been designed for a frequency band of 11.7 GHz... more An extremely-low-profile helical array antenna has been designed for a frequency band of 11.7 GHz to 12.0 GHz. Calculations show how proper spacing of the helical elements serves to reduce the deterioration in the directivity of a helical array antenna when the radiation beam is tilted from the normal direction of the array plane. The measured aperture efficiency shows a

Research paper thumbnail of Dual-spiral slot array antenna fed by triplate transmission line

International Symposium on Antennas and Propagation Society, Merging Technologies for the 90's

ABSTRACT

Research paper thumbnail of Numerical analysis of a helical antenna with a finite ground plane

1986 Antennas and Propagation Society International Symposium

Research paper thumbnail of Simplified integral equation on electromagnetic coupling between arbitrarily bent wires and slots

1984 Antennas and Propagation Society International Symposium

ABSTRACT

Research paper thumbnail of Numerical analysis of spiral antenna backed by a reflector

1985 Antennas and Propagation Society International Symposium

ABSTRACT

Research paper thumbnail of Alternative derivation of integral equation for arbitrary antennas and scatterers

1982 Antennas and Propagation Society International Symposium

ABSTRACT

Research paper thumbnail of Polarization diversity of 4-arm Archimedean spiral antenna

1983 Antennas and Propagation Society International Symposium

ABSTRACT

Research paper thumbnail of Tapered balanced helices radiating in the axial mode

1980 Antennas and Propagation Society International Symposium

ABSTRACT

Research paper thumbnail of The balanced helices radiating in the axial mode

1979 Antennas and Propagation Society International Symposium

Research paper thumbnail of A Loop Antenna with Parallel Wires for Circular Polarization—Its Application to Two Types of Microstrip-Line Antennas

IEEE Antennas and Wireless Propagation Letters

ABSTRACT We propose a novel loop antenna having parallel wires. The antenna is analyzed using the... more ABSTRACT We propose a novel loop antenna having parallel wires. The antenna is analyzed using the method of moments. It is found that when the distance between the parallel wires is appropriately chosen, the antenna radiates a circularly polarized (CP) wave. The rotational sense of the CP radiation depends on the feed location at the junction of the loop and parallel wires. On the basis of these radiation characteristics, we design two types of loop-line antennas whose radiation mechanisms are different from each other.

Research paper thumbnail of Numerical Analysis of Electromagnetic Coupling Effects in Measurements of Frequency Dependent Soil Electrical Properties

Progress In Electromagnetics Research M

Research paper thumbnail of Directive properties of parasitic helix and its application to circularly polarised antenna

IEE Proceedings H Microwaves, Optics and Antennas

Research paper thumbnail of Technical memorandum: effects of adding a small disk to a spiral antenna backed by a conducting plane reflector

IEE Proceedings H Microwaves, Antennas and Propagation

Research paper thumbnail of Monofilar conical-helix antenna with low pitch angle

IEE Proceedings H Microwaves, Optics and Antennas

Research paper thumbnail of Shortening ratios of modified dipole antennas

IEEE Transactions on Antennas and Propagation

Research paper thumbnail of Fan-shaped antennas: Realization of wideband characteristics and generation of stop bands

Research paper thumbnail of Low-Profile Dual-Loop Antennas With a Straight Wire for Circular Polarization

IEEE Antennas and Wireless Propagation Letters, 2013

ABSTRACT

Research paper thumbnail of Efficient implementation of frequency-dependent 3D LOD-FDTD method using fundamental scheme

Electronics Letters, 2012

Research paper thumbnail of An integral equation and its application to spiral antennas on semi-infinite dielectric materials

IEEE Transactions on Antennas and Propagation, 1998

Research paper thumbnail of Reformulation of the ADI-BPM using a fundamental scheme

IEICE Electronics Express, 2012

Research paper thumbnail of An extremely low-profile helical array antenna

International Symposium on Antennas and Propagation Society, Merging Technologies for the 90's

An extremely-low-profile helical array antenna has been designed for a frequency band of 11.7 GHz... more An extremely-low-profile helical array antenna has been designed for a frequency band of 11.7 GHz to 12.0 GHz. Calculations show how proper spacing of the helical elements serves to reduce the deterioration in the directivity of a helical array antenna when the radiation beam is tilted from the normal direction of the array plane. The measured aperture efficiency shows a

Research paper thumbnail of Dual-spiral slot array antenna fed by triplate transmission line

International Symposium on Antennas and Propagation Society, Merging Technologies for the 90's

ABSTRACT

Research paper thumbnail of Numerical analysis of a helical antenna with a finite ground plane

1986 Antennas and Propagation Society International Symposium

Research paper thumbnail of Simplified integral equation on electromagnetic coupling between arbitrarily bent wires and slots

1984 Antennas and Propagation Society International Symposium

ABSTRACT

Research paper thumbnail of Numerical analysis of spiral antenna backed by a reflector

1985 Antennas and Propagation Society International Symposium

ABSTRACT

Research paper thumbnail of Alternative derivation of integral equation for arbitrary antennas and scatterers

1982 Antennas and Propagation Society International Symposium

ABSTRACT

Research paper thumbnail of Polarization diversity of 4-arm Archimedean spiral antenna

1983 Antennas and Propagation Society International Symposium

ABSTRACT

Research paper thumbnail of Tapered balanced helices radiating in the axial mode

1980 Antennas and Propagation Society International Symposium

ABSTRACT

Research paper thumbnail of The balanced helices radiating in the axial mode

1979 Antennas and Propagation Society International Symposium

Research paper thumbnail of A Loop Antenna with Parallel Wires for Circular Polarization—Its Application to Two Types of Microstrip-Line Antennas

IEEE Antennas and Wireless Propagation Letters

ABSTRACT We propose a novel loop antenna having parallel wires. The antenna is analyzed using the... more ABSTRACT We propose a novel loop antenna having parallel wires. The antenna is analyzed using the method of moments. It is found that when the distance between the parallel wires is appropriately chosen, the antenna radiates a circularly polarized (CP) wave. The rotational sense of the CP radiation depends on the feed location at the junction of the loop and parallel wires. On the basis of these radiation characteristics, we design two types of loop-line antennas whose radiation mechanisms are different from each other.

Research paper thumbnail of Numerical Analysis of Electromagnetic Coupling Effects in Measurements of Frequency Dependent Soil Electrical Properties

Progress In Electromagnetics Research M

Research paper thumbnail of Directive properties of parasitic helix and its application to circularly polarised antenna

IEE Proceedings H Microwaves, Optics and Antennas

Research paper thumbnail of Technical memorandum: effects of adding a small disk to a spiral antenna backed by a conducting plane reflector

IEE Proceedings H Microwaves, Antennas and Propagation

Research paper thumbnail of Monofilar conical-helix antenna with low pitch angle

IEE Proceedings H Microwaves, Optics and Antennas

Research paper thumbnail of Shortening ratios of modified dipole antennas

IEEE Transactions on Antennas and Propagation

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