A Design Method of an Ultra-Wideband and Easy-to-Array Magic-T: A 6-14 GHz Scaled Model for a mm/submm Camera
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866914811008253952 |
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| author | Inoue, Shuhei Chin, Kah Wuy Uno, Shinsuke Kohno, Kotaro Niwa, Yuka Naganuma, Toyo Yamamura, Ryosuke Watanabe, Kazuki Takekoshi, Tatsuya Oshima, Tai |
| author_facet | Inoue, Shuhei Chin, Kah Wuy Uno, Shinsuke Kohno, Kotaro Niwa, Yuka Naganuma, Toyo Yamamura, Ryosuke Watanabe, Kazuki Takekoshi, Tatsuya Oshima, Tai |
| contents | We established a design method for a Magic-T with a single-layer dielectric/metal structure suitable for both wideband and multi-element applications for millimeter and submillimeter wave imaging observations. The design method was applied to a Magic-T with a coupled-line, stubs, and single-stage impedance transformers in a frequency-scaled model (6-14 GHz) that is relatively easy to demonstrate through manufacturing and evaluation. The major problem is that using the conventional perfect matching condition for a coupled-line alone produces an impractically large width coplanar coupled-line (CPCL) to satisfy the desired bandwidth ratio. In our study, by removing this constraint and optimizing impedances utilizing a circuit simulator with high computation speed, we found a solution with a $\sim$ 180 $\rm μ$m wide CPCL, which is approximately an order of magnitude smaller than the conventional analytical solution. Furthermore, considering the effect of transition discontinuities in the transmission lines, we optimized the line length and obtained a design solution with return loss < -20 dB, amplitude imbalance < 0.1 dB, and phase imbalance < 0.5$^\circ$ from 6.1 GHz to 14.1 GHz. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_03919 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Design Method of an Ultra-Wideband and Easy-to-Array Magic-T: A 6-14 GHz Scaled Model for a mm/submm Camera Inoue, Shuhei Chin, Kah Wuy Uno, Shinsuke Kohno, Kotaro Niwa, Yuka Naganuma, Toyo Yamamura, Ryosuke Watanabe, Kazuki Takekoshi, Tatsuya Oshima, Tai Instrumentation and Methods for Astrophysics We established a design method for a Magic-T with a single-layer dielectric/metal structure suitable for both wideband and multi-element applications for millimeter and submillimeter wave imaging observations. The design method was applied to a Magic-T with a coupled-line, stubs, and single-stage impedance transformers in a frequency-scaled model (6-14 GHz) that is relatively easy to demonstrate through manufacturing and evaluation. The major problem is that using the conventional perfect matching condition for a coupled-line alone produces an impractically large width coplanar coupled-line (CPCL) to satisfy the desired bandwidth ratio. In our study, by removing this constraint and optimizing impedances utilizing a circuit simulator with high computation speed, we found a solution with a $\sim$ 180 $\rm μ$m wide CPCL, which is approximately an order of magnitude smaller than the conventional analytical solution. Furthermore, considering the effect of transition discontinuities in the transmission lines, we optimized the line length and obtained a design solution with return loss < -20 dB, amplitude imbalance < 0.1 dB, and phase imbalance < 0.5$^\circ$ from 6.1 GHz to 14.1 GHz. |
| title | A Design Method of an Ultra-Wideband and Easy-to-Array Magic-T: A 6-14 GHz Scaled Model for a mm/submm Camera |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2405.03919 |