A Miniature Pulse Tube Cryocooler (MPTC) is the ¯rst selection for the cooling of IR sensors,
infrared detectors, etc. in space technology. The regenerator is one of the key components to
operate an MPTC at high e±ciency. The objective of this study is to explore the possibilities of
the di®erent matrices as regenerator ¯ller materials for MPTC operating at ultra-high frequencies.
REGEN 3.3 is one of the best software available for the design and optimization of cryocooler
regenerators. We have used REGEN 3.3 for numerical simulations of the three di®erent regenerator
matrix materials viz. stainless steel wire mesh screen (SS 635#), brass wire mesh screen
(500#) and copper wire mesh screen (500#) at the hot end and cold end temperatures of 300K
and 80K for COP, cooling power, total power losses and pressure losses, at an ultra-high frequency
of 100 Hz and 200 Hz. The simulation results depict that the regenerator using stainless
steel mesh screen shows better results than that of the brass mesh screen and copper mesh screen
at 100Hz. However, the performance of brass mesh screen and copper mesh screen performs better
than the stainless steel at 200 Hz. Therefore, the proposed matrix materials can be used as
regenerator materials for the MPTC at ultra-high frequencies with better performances.