Abstract: Provided is a diversity antenna apparatus of a mobile terminal including a main antenna and a sub-antenna for performing an auxiliary function using a separate sub-antenna processing module, and an implementation method thereof. When the auxiliary function is not performed, a controller of the mobile terminal disconnects the sub-antenna from the sub-antenna processing module and electrically connects the sub-antenna to an RF module through a switch such that the sub-antenna operates as a diversity antenna.

Abstract: The present invention discloses a photoresist polymer of following formula 1, and a photoresist composition comprising the same: where AC1, AC2, x and y are those defined herein. The photoresist composition has excellent transparency in deep ultraviolet region, etching resistance and heat resistance, and can form a good pattern without a developing step. Accordingly, the photoresist composition can be applied to a high density minute pattern below 0.15 &mgr;m (e.g., for fabrication of DRAM over 1G), and efficiently employed for the lithography process using ArF, KrF, VUV, EUV, E-beam and X-ray.