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Low-cost and reliable geometry scaling of compact microstrip couplers with respect to operating frequency, power split ratio, and dielectric substrate parameters
Abstract
A technique for rapid re-design of miniaturised microstrip couplers with respect to operating conditions as well as material parameters of the dielectric substrate is proposed. The dimension scaling process is based on a set of pre-optimised reference designs, obtained for an equivalent circuit model of the coupler at hand. The reference designs are utilised to construct an inverse surrogate model which – upon suitable correction – yields the optimum geometry parameter values of the structure re-designed for required values of operating conditions and substrate parameters. An iterative fine-tuning process necessary to account for the surrogate model inaccuracies is also developed. The proposed methodology is validated using a compact rat-race coupler example. The obtained results demonstrate that accurate scaling is possible at a low cost of up to three EM simulations of the structure. For a considered example, the scaling is realised within a wide range of operating conditions (1–2 GHz for the operating frequency, −3 to 0 dB for power split) and substrate parameters (0.7–1.5 mm for the thickness, and 2.5–3.5 for dielectric permittivity). Numerical results are validated experimentally.
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
IET Microwaves Antennas & Propagation
no. 12,
edition 9,
pages 1508 - 1513,
ISSN: 1751-8725 - Language:
- English
- Publication year:
- 2018
- Bibliographic description:
- Kozieł S., Bekasiewicz A.: Low-cost and reliable geometry scaling of compact microstrip couplers with respect to operating frequency, power split ratio, and dielectric substrate parameters// IET Microwaves Antennas & Propagation. -Vol. 12, iss. 9 (2018), s.1508-1513
- DOI:
- Digital Object Identifier (open in new tab) 10.1049/iet-map.2017.1166
- Verified by:
- Gdańsk University of Technology
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