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A Circular TE01 Mode Excitation for Air Drilling Using Novel Inline Rectangular TE10 Mode to Rectangular TE20 Mode Transition.

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Bibliographic Details
Title: A Circular TE01 Mode Excitation for Air Drilling Using Novel Inline Rectangular TE10 Mode to Rectangular TE20 Mode Transition.
Authors: Guo, Fangzhou1 (AUTHOR), Wu, Qingzhi2 (AUTHOR) qzwu@uestc.edu.cn, Li, Gao3 (AUTHOR), Xia, Wenhe1 (AUTHOR)
Source: Microwave & Optical Technology Letters. Sep2025, Vol. 67 Issue 9, p1-6. 6p.
Subject Terms: *MICROWAVE communication systems, *APPLIED sciences, *MEASURING instruments
Abstract: This paper proposes a circular TE01 mode excitation for downhole microwave communication during air drilling, aiming to meet the critical requirements of preserving sufficient cross‐sectional airflow area while maintaining a relatively short structural length. The excitation approach initiates by generating a rectangular TE10 mode using a conventional probe. A novel inline transition structure is subsequently developed, employing a strategically positioned septum to achieve rectangular TE10 to TE20 mode conversion via field bisection into opposite phase components, while preserving maximum airflow capacity. The excitation further incorporates a compact three‐section transition to facilitate efficient rectangular TE20 to circular TE01 mode conversion, reducing longitudinal dimension to mitigate drill pipe deformation effect. A cross‐radial metal sheet (CRMS) configuration is implemented to effectively suppress spurious modes and enhance mode purity. Finally, a back‐to‐back prototype was fabricated and measured, showing a return loss better than 15 dB and an insertion loss lower than 1.3 dB from 6.13 to 6.27 GHz, demonstrating the performance of proposed method. [ABSTRACT FROM AUTHOR]
Database: Academic Search Index
Description
Abstract:This paper proposes a circular TE01 mode excitation for downhole microwave communication during air drilling, aiming to meet the critical requirements of preserving sufficient cross‐sectional airflow area while maintaining a relatively short structural length. The excitation approach initiates by generating a rectangular TE10 mode using a conventional probe. A novel inline transition structure is subsequently developed, employing a strategically positioned septum to achieve rectangular TE10 to TE20 mode conversion via field bisection into opposite phase components, while preserving maximum airflow capacity. The excitation further incorporates a compact three‐section transition to facilitate efficient rectangular TE20 to circular TE01 mode conversion, reducing longitudinal dimension to mitigate drill pipe deformation effect. A cross‐radial metal sheet (CRMS) configuration is implemented to effectively suppress spurious modes and enhance mode purity. Finally, a back‐to‐back prototype was fabricated and measured, showing a return loss better than 15 dB and an insertion loss lower than 1.3 dB from 6.13 to 6.27 GHz, demonstrating the performance of proposed method. [ABSTRACT FROM AUTHOR]
ISSN:08952477
DOI:10.1002/mop.70370