Ultra-miniaturized Balanced Bandpass Filter Using GaAs-based Integrated Passive Device Technology

In this paper, an ultra-miniaturized narrowband balanced bandpass filter based on integrated passive device (IPD) technology is proposed. By using the basic principle microwave filter and mixed-mode S-parameters, a lumped-element balanced bandpass filter for the band from 4.8 to 5 GHz is designed at first. For demonstration, a design prototype based on a 200-μm GaAs substrate with 17-dB differential-mode return loss and 20-dB common-mode suppression is EM simulated by ADS software. Good agreements between theoretical and EM simulated results are obtained.