Abstract #4060

An automatic tuning free pin diode shunt switch with artificial non-uniform transmission line λ/4 sections for receive only surface array coils.

Miheer Pradeep Mayekar¹, Rohit Apurva¹, Bhaskara Naik¹, and Rajesh Harsh¹

¹Technology Innovation Department, Society for Applied Microwave Electronics Engineering and Research, Mumbai, India

The excessive high-power during transmission saturates or in worst case damages the preamplifier. In shunt switch an artificial (lumped component) uniform λ/4 section is inserted between two shunt diodes to increase its isolation. To restore the preamplifier-decoupling performance degraded by λ/4 section, it is required to add lossy tuning components e.g. varactor diodes to change the λ/4 section’s phase. We are proposing a pin-diode shunt RF switch with two lumped component non-uniform λ/4 sections which will maintain the preamplifier decoupling performance during reception sans complex tuning components and provides additional isolation of around 10-db as compared to uniform λ/4 sections.

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