Design of Compact Millimeter-Wave Bandpass Filter With Multiple Transmission Zeros Using Edge-Coupled Resonators in Silicon Technology

A novel on-chip bandpass filter (BPF) design methodology is presented in this paper which utilizes four compact edge-coupled resonators with four lumped-element capacitors implemented in metal-insulator-metal (MIM) technology. Unlike previously published works that also utilize resonator-based approaches, multiple transmission zeros (TZs) can be generated using this approach. A design example is given, which can generate three transmission zeros (TZs). Two of them are located at a high-frequency stopband and one of them is located at a low-frequency stopband. To demonstrate that the presented design methodology is valid, a millimetre-wave (mm-Wave) BPF is fabricated in a commercial 0.13-μm CMOS technology. The measured results show that the 3-dB bandwidth covers from 18.5 GHz to 22.5 GHz. The minimum insertion loss is 5 dB and the three TZs are found at 14 GHz, 30 GHz and 46 GHz, respectively. The chip size, excluding the pads, is only 0.24 × 0.47 mm
²
.