| Presentation | 2020-09-24 Fundamental Study on Calculation of S11 for a Coaxial-loaded Type Stepped Cut-off Circular Waveguide Based on the Method of Moments Kouji Shibata, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | The author previously proposed a novel jig structure suitable for S11 calibration using SOM (short, open and reference material) termination was proposed as a preliminary step for dielectric measurement in liquids via the cut-off circular waveguide reflection method. Specifically, for realization of S1 calibration with reliable short termination, the inner diameter of the waveguide of the jig was set to be slightly larger than the inner diameter of the outer conductor of the coaxial line in order to ensure that the short element remains in contact with the outer conductor (ground plane) of the coaxial line due to its placement in the waveguide. However, the error in the measured S11 value and the estimated value of the complex permittivity due to the difference in theinner diameter of the sample insertion part should be quantitatively evaluated for application of this structure to the dilectric measurement of liquids. For this purpose, the exact S11 value of the analytical structure with various liquid sample inserted into the jig needs to be calculated. In this study, the formula for calculating S11 of stepped circular waveguide with coaxial feed was formulated by the method of moments (MoM). Next, the formulated analytical model wasassumed to be following two conditions; 1. no sample is inserted (open condition) and 2. pure water is inserted. S11 for the analytical model was calculated at frequencies of 0.50, 1.5 and 3.0 GHz. The calculated values of S11 by the MoM above were compared with those by the mode-matching technique (MMT) andthe finite element method (FEM). As a result, the calculated value of S11 by the MoM was in good agreement with the calculated value by the MMT. Moreover, the same tendency was confirmed in the calculated value of S11 by the MoM and the calculated value by the FEM, even if the inner diameter of the cylindrical cavity is slightly larger than the inner diameter of the outer conductor of the coaxial line. The validity of the formulation of the equation for the analytical model was thus confirmed. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Coaxial line / Cut-off circular waveguide / S11 / Electromagnetic Analysis / Method of Moments / Mode matching method / Finite element method / Mode matching technique |
| Paper # | MW2020-37 |
| Date of Issue | 2020-09-17 (MW) |
| Conference Information | |
| Committee | MW / AP |
|---|---|
| Conference Date | 2020/9/24(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Microwave, Millimeter wave, Antennas and Propagation |
| Chair | Yoshinori Kogami(Utsunomiya Univ.) / Qiang Chen(Tohoku Univ.) |
| Vice Chair | Tadashi Kawai(Univ. of Hyogo) / Kensuke Okubo(Okayama Prefectural Univ.) / Shintaro Shinjo(Mitsubishi Electric) / Satoru Kurokawa(AIST) |
| Secretary | Tadashi Kawai(Fujitsu Labs.) / Kensuke Okubo(Saitama Univ.) / Shintaro Shinjo(Tokyo Univ. of Agric. & Tech.) / Satoru Kurokawa(NTT DOCOMO) |
| Assistant | Kyoya Takano(Tokyo Univ. of Science) / Naoki Hasegawa(Softbank) / Dr. Kim(Niigata Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Microwaves / Technical Committee on Antennas and Propagation |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Fundamental Study on Calculation of S11 for a Coaxial-loaded Type Stepped Cut-off Circular Waveguide Based on the Method of Moments |
| Sub Title (in English) | |
| Keyword(1) | Coaxial line |
| Keyword(2) | Cut-off circular waveguide |
| Keyword(3) | S11 |
| Keyword(4) | Electromagnetic Analysis |
| Keyword(5) | Method of Moments |
| Keyword(6) | Mode matching method |
| Keyword(7) | Finite element method |
| Keyword(8) | Mode matching technique |
| 1st Author's Name | Kouji Shibata |
| 1st Author's Affiliation | Hachinohe Institute of Technology(Hachinohe Inst. of Tech.) |
| Date | 2020-09-24 |
| Paper # | MW2020-37 |
| Volume (vol) | vol.120 |
| Number (no) | MW-172 |
| Page | pp.pp.13-18(MW), |
| #Pages | 6 |
| Date of Issue | 2020-09-17 (MW) |