tent
帟 centers on a tent: a temporary shelter made of cloth. The meaning is straightforward and specific to a tent structure.
帟 combines 巾 (cloth) with 亦, which likely contributes a phonetic element. The character is used for a tent or canopy, fitting the cloth component.
The top 亦 looks like a frame or poles, and the bottom 巾 is cloth. Together they form a tent: a cloth shelter supported by a frame.
For エキ, imagine a tent set up at an exhibition (エキシビション): exhibition -> エキ, and the tent is the main display.