Compact dual-band antennas with inductive loads operating at MedRadio band

This study proposes a compact dual-band antenna for MedRadio band (401 - 406 MHz). Chip inductors are applied in meandering monopole and spiral slot antennas to achieve a compact design. The simulated E-field of the monopole antenna increases significantly due to the inductive loads. The resonance modes of these two radiation components form 404 and 437 MHz. The dimension of the proposed antenna is 0.0269λ₀ × 0.0269λ₀ × 0.00108λ₀ mm³. The antenna simulated gains at 404 MHz and 437 MHz are -27.6 dBi and -29 dBi, respectively.