Design and measurement of a new compact filter and a microstrip antenna is proposed for IEEE 802.11 applications. Here the size of the three pole hair pin BPF is approximately reduced from 6.83 cm to 5.81 cm, The three pole hair pin BPF designed at center frequency 1.97 GHz achieves an impedance bandwidth of 5.16 % (over 1.6 – 2.4 GHz) at a reflection coefficient |S11| < -20 dB and has a gain of 0.44 dB. Also the size of the designed antenna is nearly 45 mm x 35 mm on TRF substrate with relative permittivity of 4.1 dB. The antenna has a resonance frequency of 2.14 GHz with a gain of 0.15 dB.