In this thesis,we design a CPW-fed dual-band monopole,which have the bandwidth covers IEEE 802.11 a/b/g。This monopole antenna have good polarization isolation and stable antenna gain. And then, we design a loop antenna for Wireless In-building Network application which can be used as the antenna of control Module. This antenna enhances the bandwidth of loop antenna to cover the IEEE 802.11 a. The loop antenna have unidirectional radiation pattern and stable antenna gain.