A Miniaturized GaAs MMIC Bandpass Filter for 5GHz Band

Novel miniaturized GaAs based bandpass filters for 5GHz band WLAN using diagonally end-shorted coupled lines and lumped capacitors are proposed. The new filter has a compact size, as small as a few degrees, and shows wider stopband characteristic over 35dB up to 60 GHz. A two-stage band pass filter with planar structure was designed and fabricated at a center frequency of 5.5 GHz, with chip surface area only 0.54× 0.78 mm. The fabricated filter has been implemented using Knowledge*on GaAs process. Index terms — GaAs filters, miniaturization, parallel coupled lines