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Microstripline Switch for 3T and 7T Proton Coils
(*) Corresponding author
DOI: https://doi.org/10.15866/irecap.v13i5.23676
Abstract
This paper presents a Transmit/Receive (T/R) switch for 1H atomic nucleus at 3T and 7T magnetic field strength for Magnetic Resonance Imaging (MRI) system is introduced. This switch is composed of two microstripline-based hybrid couplers. The two-hybrid couplers are designed and simulated by using ADS software to operate at a fundamental frequency of 127.8 MHz (1H frequency at 3T). A tuning circuit (LC network) has been inserted into the ports of the hybrid couplers in order to tune the 3rd harmonic frequency to 298 MHz (1H frequency at 7T) without affecting the fundamental frequency. This allows the switch to operate in two different frequency bands simultaneously (127.8 MHz and 298 MHz). This switch demonstrates good matching (return loss (18 dB), low insertion loss (( 0.2 dB), and high isolation (>59 dB) at transmission and reception states.
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