Search Results - "Shigesawa, Hiroshi"

Leakage effect of printed circuit transmission lines with multilayered dielectric substrate by Tsuji, Mikio, Shigesawa, Hiroshi

“…We have proposed here a new structure of printed circuit transmission lines in which the dominant mode leaks power through additional dielectric multilayer…”
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A microstrip-line phase shifter constructed by a tunable filter by Morikawa, Daisuke, Deguchi, Hiroyuki, Tsuji, Mikio, Shigesawa, Hiroshi

“…A phase shifter configuration based on a bandpass filter that can change the phase continuously is discussed. In this configuration, the phase change due to…”
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Planar-circuit bandpass filters consisting of arbitrarily shaped elements by Ohira, Masataka, Deguchi, Hiroyuki, Tsuji, Mikio, Shigesawa, Hiroshi

“…This paper presents an arbitrarily shaped circuit as a planar circuit filter optimized by using a genetic algorithm and develops new, never‐before‐seen planar…”
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Design of microstrip-line bandpass filter based on reflected characteristics in time domain by Nakayama, Masaharu, Deguchi, Hiroyuki, Tsuji, Mikio, Shigesawa, Hiroshi

“…As an inverse scattering problem using the one‐dimensional Transmission‐Line Matrix (TLM) method, it is possible to derive the transmission line shape from an…”
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Dual-mode horn antennas suppressing higher-order modes by Deguchi, Hiroyuki, Tsuji, Mikio, Shigesawa, Hiroshi

“…In the dual‐mode conical horn antennas proposed to date, the wave front on the aperture plane becomes spherical, so that the efficiency is degraded due to…”
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Multiband single-layer frequency selective surface designed by combination of genetic algorithm and geometry-refinement technique by Ohira, M., Deguchi, H., Tsuji, M., Shigesawa, H.

“…This paper proposes an optimization-design method for the frequency selective surface (FSS) based on the genetic algorithm (GA) incorporated with a…”
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Novel waveguide filters with multiple attenuation poles using dual-behavior resonance of frequency-selective surfaces by Ohira, M., Deguchi, H., Tsuji, M., Shigesawa, H.

“…This paper develops novel waveguide filters consisting of frequency-selective surfaces (FSSs) in order to realize both the drastic size reduction and multiple…”
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Compact low-cross-polarization horn antennas with serpentine-shaped taper by Deguchi, H., Tsuji, M., Shigesawa, H.

“…A compact horn with low cross polarization component less than -35 dB over 5% frequency bandwidth has been obtained by optimizing the taper configuration. To…”
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Design of rotational dielectric dome with linear array feed for wide-angle multibeam antenna applications by Kawahara, Hiroyuki, Deguchi, Hiroyuki, Tsuji, Mikio, Shigesawa, Hiroshi

“…This paper proposes a method for design of the shape and thickness of a dielectric dome by optimization, aiming at achieving multibeam emission with a uniform…”
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Synthesis of a High Efficiency Conical-Horn Antenna: Effect of the Negative Flare Angle by Deguchi, Hiroyuki, Tsuji, Mikio, Shigesawa, Hiroshi

“…In this paper, we propose a method to realize a high efficiency multiple-mode conical-horn antenna with low cross polarization. Contrary to usual horn…”
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Printed-Circuit Analysis by a New Mode-Matching Method Based on the Edge-Effect Theory by Tsuji, Mikio, Shigesawa, Hiroshi

“…A new mode-matching method is proposed here for printed-circuit analysis, which considers the field-continuity conditions via the aperture field expanded into…”
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Significant contribution of nonphysical leaky mode to the field excited by a source by Tsuji, M., Ueki, S., Shigesawa, H.

“…We were the first to report on printed-circuit transmission lines that nonphysical improper real solutions may have a significant effect on the physical total…”
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A novel waveguide bandpass filter with multiple attenuation poles using four-armed square-loop FSSs by Ohira, Masataka, Deguchi, Hiroyuki, Tsuji, Mikio, Shigesawa, Hiroshi

“…This paper presents a waveguide filter loaded with frequency selective surfaces (FSS) that can realize multiple attenuation poles. As the FSS resonant element,…”
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Analysis of frequency selective surface with arbitrarily shaped element by equivalent circuit model by Ohira, Masataka, Deguchi, Hiroyuki, Tsuji, Mikio, Shigesawa, Hiroshi

“…This paper presents an analysis of the characteristics of the frequency selective surface (FSS) by means of equivalent circuit models. In order to determine…”
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Novel Waveguide Filters with Multiple Attenuation Poles Using Frequency Selective Surfaces by Ohira, Masataka, Deguchi, Hiroyuki, Tsuji, Mikio, Shigesawa, Hiroshi

“…This paper proposes a waveguide filter consisting of frequency selective surfaces (FSS) with an arbitrarily-shaped element, which can control not only a…”
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Multimode horn with optimum gain within circular area by Deguchi, Hiroyuki, Okada, Taisuke, Tsuji, Mikio, Shigesawa, Hiroshi

“…In this paper, a multimode horn efficiently illuminating the entire circular area is proposed. In comparison with the conventional dual mode horn with a pencil…”
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Simultaneous propagation of bound and leaky dominant modes on printed-circuit lines: a new general effect by Shigesawa, H., Tsuji, M., Oliner, A.A.

“…We were the first to report that both the bound and leaky dominant modes can propagate simultaneously on conductor-backed coplanar strips over a frequency…”
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Leaky-wave phenomena viewed from the time domain by Shigesawa, Hiroshi, Tsuji, Mikio

“…It is known until now that when most printed‐circuit transmission lines are excited by a practical source of a monochromatic high frequency, the near‐field…”
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Significant contribution of nonphysical leaky mode to the fields excited by a practical source in printed-circuit transmission lines by Tsuji, M., Ueki, S., Shigesawa, H.

“…We were the first to report for printed-circuit transmission lines that nonphysical improper real solutions have significant effect on physical total field…”
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New interesting leakage behavior on coplanar waveguides of finite and infinite widths by Tsuji, M., Shigesawa, H., Oliner, A.A.

“…Above a critical frequency, the dominant mode on coplanar waveguide leaks power in the form of a surface wave on the surrounding substrate, causing undesirable…”
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