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A very small normal-mode helical antenna (NMHA) has been developed for sensor antennas of the tire pressure monitoring system (TPMS) and tag antennas of the radio frequency identification (RFID), because of the usefulness in metal proximity. In order to achieve an actual antenna applicable to radio units, an impedance matching structure was necessary. A simple tap structure was developed in the works...
Very small normal-mode helical antennas (NMHA) can achieve a high antenna gain in the metal proximity use. So, the NMHAs were developing to use for the RFID (Radio Frequency Identification) tags and the TPMS (Tire Pressure Monitoring System) sensor antenna placed in a tire. In order to achieve impedance matching to the radio unit, a tap feed structure is inevitable. In this paper, the usefulness of...
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