<p>This paper introduces a pioneering approach to enhancing security in locking systems by integrating microwave technology and metamaterials. The proposed microwave lock incorporates an array of uniquely sized S-shaped split-ring resonators (S-SRRs) to generate distinct resonance bands. Manipulating the orientations of these resonators enables the lock to be configured into specific states based on the magnitudes of the transmission coefficients. In this proof-of-concept study, a coplanar waveguide (CPW) loaded with three S-SRRs is fabricated on an FR4 substrate, forming a prototype with dimensions of 87 mm × 22 mm × 0.8 mm. When all S-SRRs are oriented at 90o, the microwave lock resonates at 0.98 GHz, 1.23 GHz, and 1.48 GHz, with each frequency corresponding to a distinct state determined by the transmission coefficient. Utilizing a vector network analyzer (VNA), the transmission coefficient data is extracted and stored in a signal processing unit, establishing the initial lock configuration. To unlock the system, users must accurately align the S-SRRs to recreate the initial combination. The signal processing unit analyzes resonance frequencies, their magnitudes, and the corresponding transmission coefficient states. Successful unlocking requires the current combination to match preset conditions: the correct number of resonance frequencies, magnitudes within a 30 MHz tolerance of the preset values, and alignment with predefined states. The proposed microwave lock adds an extra layer of security by amalgamating metamaterial design principles with advanced signal processing. Its adaptability and precision position it as a compelling solution for applications demanding robust access control and protection.</p>