Design of 50cm Square 900Mhz Flat Antenna

I'm looking for a professional who can design a 50cm square 900Mhz flat antenna. This antenna will primarily be used for inventory management systems, particularly for RAIN RFID tags. Key Requirements: - Primary Use: The antenna will be used in inventory management, so it needs to be efficient for such applications. - Performance: The most critical aspect of the antenna is its read accuracy. I need an expert who can ensure high read accuracy for this design. - Environmental Conditions: The antenna will be used indoors only, so it doesn't need to be designed for outdoor durability. - The antenna will sit in a steel drawer inside a cabinet. It can be spaced off the steel 5-10mm. - It could be an array of antennas also. I think the antenna could be constructed using as a multiplayer FR-4 PCB. Antenna & ground on internal layers with the PCB protecting them. If nothing else this might provide a low cost prototype. Ideal Skills and Experience: - Expertise in antenna design, particularly for 900Mhz frequencies. - Proven track record in designing antennas for inventory management systems. Please provide examples of similar projects you've completed in your proposal.