Moriyasu Miyazaki

Uniaxially Symmetrical T-Junction OMT with 45° -Tilted Branch Waveguide Ports

Hidenori Yukawa, Yu Ushijima, Toru TAKAHASHI, Toru Fukasawa et autres

A T-junction orthomode transducer (OMT) is a waveguide component that separates two orthogonal linear polarizations in the same frequency band. It has a common circular waveguide short-circuited at one end and two branch rectangular waveguides arranged in opposite directions near the short …

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Uniaxially Symmetrical T-Junction OMT with 45-Degree Tilted Branch Waveguide Ports

Hidenori Yukawa, Yu Ushijima, Toru Takahashi, Toru Fukasawa et autres

A T-junction Ortho-Mode-Transducer (OMT) is known as one of waveguide components that separate two orthogonal linear polarizations in the same frequency band. One of the advantages of the T-junction OMT is short axial length. However, the two rectangular ports need to be …

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Termination with Stubs in Resistive Film

Hidenori Ishibashi, Yukihiro Tarui, Yuko Onodera, Toru TAKAHASHI et autres

In recent years, T/R modules have required surface mount terminations with high-power capability for cost reduction. Terminations with large resistive film on aluminum nitride have been proposed as a method for high power use. However, they have a problem that it is …

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180-Degree Branch Line Coupler Composed of Two Types of Iris-Loaded Waveguides

Hidenori Yukawa, Yu Ushijima, Naofumi Yoneda, Moriyasu Miyazaki

We propose a 180-degree branch line coupler composed of two types of iris-loaded waveguides. The proposed coupler consists of two main transmission lines and branch lines with different electrical lengths. Based on optimal electrical lengths, a 180-degree output phase difference can be …

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Advanced GaN HEMT Modeling Techniques and Power Amplifiers for Millimeter-Wave Applications

Shintaro Shinjo, Masatake Hangai, Yutaro Yamaguchi, Moriyasu Miyazaki

Satellite communications become more interesting because of an increasing number of satellite launches for especially Ku-band very small aperture terminals (VSAT). Recently, the systems push the frequency specifications towards millimeter-wave such as Ka-band. Also, the fifth generation mobile communications (5G) are expected …

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A Study of Termination with Stubs in Resistive Film

Hidenori Ishibashi, Yukinobu Tarui, Yuko Onodera, Toru TAKAHASHI et autres

T-Junction OMT with 45-degree tilted Waveguide Ports

Hidenori Yukawa, Yu Ushijima, Toru Takahashi, Naofumi Yoneda et autres

Metal 3D-Printed T-Junction Ortho-Mode-Transducer with an Offset Stepped Post

Hidenori Yukawa, Yu Ushijima, Motomi Abe, Takeshi Oshima et autres

We propose a T-junction OMT consisting of an offset stepped post. The offset stepped post contributes to the matching of two rectangular ports at the short circuit, situated at the opposite side walls. The structure without conventional ridges is simple and makes …

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180-Degree Branch Line Coupler Composed of Two Types of Iris-Loaded Waveguides

Hidenori Yukawa, Yu Ushijima, Takeshi Yuasa, Naofumi Yoneda et autres

We propose a 180-degree branch line coupler composed of two types of iris-loaded waveguides. The proposed coupler consists of two main transmission lines and branch lines with different electrical lengths. Optimal electrical lengths enable to achieve 180-degree output phase difference without additional …

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A 3-D Metal-Direct-Printed, Low-Cost, and Light Hexagonal Waveguide Ka-Band Branch Line Coupler

Motomi Abe, Hidenori Yukawa, Yu Ushijima, Takuma Nishimura et autres

A 3-D metal-direct-printed, low-cost, and light hexagonal waveguide Ka-band branch line coupler

Motomi Abe, Hidenori Yukawa, Yu Ushijima, Takuma Nishimura et autres

A hexagonal waveguide branch line coupler suitable for manufacture by a 3-D printer is proposed in this study, and its design method is elucidated. The Ka-band coupler manufactured by a 3-D printer exhibits characteristics similar to those of a machined coupler, but …

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Dual band rectangular waveguide polarizer using corrugated/elongated conductive plates for Ka-band

Yu Ushijima, Hidenori Yukawa, Naofumi Yoneda, Moriyasu Miyazaki

This paper presents a novel rectangular waveguide polarizer for Ka-band. The polarizer consists of corrugated waveguide with an elongated conductive plate in the axial direction. The combination of the corrugated and elongated conductive plates increases the phase difference, and decreases frequency deviation …

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