setting up rabiflops - josalggui/MaRGE GitHub Wiki

If you need an initial estimation of the antenna efficiency, use a pick-up coil placed inside your solenoid RF coil.

Important Notes:

• You must know the pick-up loop area and the number of turns.
• In this example, I use a 2-turn pick-up loop with a diameter of 1.6 cm (illustrated below).

Follow these steps to measure the S21 parameter using a VNA (Vector Network Analyzer):

1. Tune and match your solenoid RF coil to 50 Ohms at the desired frequency. The RF coil must be inside your scanner.
2. Connect the solenoid to Port 1 of the VNA.
3. Connect the pick-up loop to Port 2 of the VNA.
4. Measure the S21 parameter.

The figure below illustrates the setup:

The RF solenoid efficiency ((\varepsilon)) can be estimated using the following formula:

[ \varepsilon = \frac{\sqrt{2} \cdot R_L}{2\pi \cdot f \cdot n \cdot S} \cdot S_{21} ]

Where:

• ( R_L ) is the load resistance (50 Ohms).
• ( n ) is the number of turns of the pick-up loop.
• ( S ) is the surface area of the pick-up loop.
• ( S_{21} ) is the transmission coefficient (in linear scale).

To begin, add your antenna to the antenna list in the hw_config.py file.

Assumptions:

• The antenna is already connected to the scanner.
• The antenna’s efficiency is unknown.
• The antenna is properly tuned to the desired frequency and matched to 50 Ohms.

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From the Custom tab, select the RabiFlops sequence from the sequence list.

If you have a prior estimate of the antenna efficiency, it can help determine appropriate input parameters for the sequence.

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If you need an initial estimation of the antenna efficiency, use a pick-up coil placed inside your solenoid RF coil.

Important Notes:

• You must know the pick-up loop area and the number of turns.
• In this example, I use a 2-turn pick-up loop with a diameter of 1.6 cm (illustrated below).

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Follow these steps to measure the S21 parameter using a VNA (Vector Network Analyzer):

1. Tune and match your solenoid RF coil to 50 Ohms at the desired frequency.
2. Connect the solenoid to Port 1 of the VNA.
3. Connect the pick-up loop to Port 2 of the VNA.
4. Measure the S21 parameter.

The figure below illustrates the setup:

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