RF Antenna for Generation of Spin-Dependent Force on Cold Lithium Atoms

This study aims to design a small radio-frequency (RF) antenna that can generate magnetic fields with magnitude of 1 Gauss. This RF antenna is useful because the generated fields can magnify the hyperfine state of lithium atoms which are used to study the quantum atomic gas at low temperature. However, the function of the RF antenna is restricted when the diameter of the antenna is constrained in less than 1 inch. This restriction is the result of a high energy loss caused by signal reflection in the circuits if the antenna is directly connected with the power supply. In order to reduce the loss, an impedance matching configuration should be introduced between the antenna and the power supply. At the end of the experiment, a small RF antenna with impedance matching configuration that can generate a magnetic field with desired frequency and amplitude is designed.