Journal of Circuits, Systems, and Computers  World Scientific Publishing Company 1 THIN FILM FERROELECTRIC TUNABLE ZEROTH-ORDER RESONATOR BASED ON CRLH METAMATERIALS Mohamed M. Mansour, Mostafa A. Elmala Microelectronics Department, Electronics Research Institute, Cairo, Egypt eng_mansor10@yahoo.com Abdel-Aziz T. Shalaby, El-Sayed M. El-Rabaie Communications Department, Electronic Engineering Faculty, Menfoia, Egypt ashalaby290@yahoo.com, srabie1@yahoo.com Received (Day Month Year) Revised (Day Month Year) Accepted (Day Month Year) In this paper, we propose a tunable CRLH ZOR based on the latest resurgent of ferroelectric materials. It is known that for most resonant structures, attainment of optimal performance requires some level of additional tuning through either mechanical means (i.e., with tuning screws) or other coupling mechanisms. Therefore, incorporation of electronic tuning into HTS components with- out degradation of performance is very attractive. The result will be low-loss microwave components that could be fine-tuned for optimal performance, with the additional attribute of being tunable over a broadband frequency range. The dielectric properties of the ferroelectric thin film, and the thickness of the ferroelectric film, play a fundamental role in the frequency or phase tunability and the overall insertion loss of the circuit. The main driving force toward using the ferroelectric is the potential for substantial miniaturization of microwave components and systems and the potential for integration with microelectronic circuits due to the development of thin and thick film ferroelectric technology. The ZOR is designed, and simulated by the full-wave analysis software. The response shows a variation of electromagnetic characteristics with the applied electric field, ferroelectric thickness and the operating temperature. Keywords: HTS; Ferroelectric; LHM; MTM; STO; ZOR.. 1. Introduction Electronically tunable and switchable microwave devices are always in demand if flexibility is desired. Tunable devices provide for new functionalities and enable the design of communication systems with reduced size and complexity. For example, a single tunable filter may replace a complete filter bank consisting of multiple different