Yüksek dönüşüm oranına sahip metamalzeme polarizasyon dönüştürücüler

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Thesis Type: Postgraduate

Institution Of The Thesis: Ataturk University, Fen Bilimleri Enstitüsü, Elektrik Elektronik Mühendisliği Anabilim Dalı, Turkey

Approval Date: 2025

Thesis Language: Turkish

Student: KÜBRA DÖNMEZ

Supervisor: Gökhan Öztürk

Open Archive Collection: AVESIS Open Access Collection

Abstract:

In this thesis, we will propose a reflection type circular and linear polarization converter with anisotropic MS-based structure for X-, Ku- and K-band applications. We aim to note that with the proposed design with a relatively thinner (1.6 mm) cost-effective FR4 substrate, left-handed circular polarization capability in the 12.35–7.8 GHz frequency spectrum (Ku) and cross-polarization with a PCR value of over 97% can be achieved. . In addition, we aim with the transducer to offer left-hand circular polarization capability in the frequency range of 10.85–11.05 GHz and 21.85–27.40 GHz corresponding to the X- and K-bands for the 𝑦-polarized incoming wave. Also, the converter provides conversion from linear polarization (LP) to circular polarization (CP) in almost the full spectrum of K-, and we aim to provide a PCR value greater than 80% for angles of incidence up to 50 degrees in Kuband for oblique incidence. The simulation results performed by the 3D electromagnetic simulation program CST Microwave Studio will be compared with free space microwave measurements to validate the proposed transducer.