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Because of its convenience, electronic key systems are adopted by many automakers. Ensuring the performance of low frequency (LF) and ultra-high frequency (UHF) electromagnetic waves is a critical part of system development. One of the most important performance aspects of this system is ensuring communication in the required area, and the tuning process is a key factor in the development phase. Conventionally, a large amount of work hours and cost is required for this tuning process, which usually adopts a cut-and-try approach based on technical experience to satisfy the required specifications in the LF band. The development process was successfully shortened by applying the newly developed LF electromagnetic simulation technique described in this paper.