Design of Three Super Compact 5G Band Pass Filters with Integrated Passive Device Technology for 802.11a Wireless LAN

A highly miniaturized low loss Si integrated passive device (IPD) based 5G band pass filter (BPF) design is presented in this paper. Three multilayer (ML) square spiral inductors and a square spiral capacitor are designed and simulated. The constant width, variable width and a novel double split inductors possess maximum quality factors of 19.258, 20.852 and 25.353 and self-resonating frequencies of at 9.4, 9.2 and 12.9 GHz respectively. The simulated capacitor has capacitance of 0.352, 0.403 and 0.385 pF and Q value of 32.82, 25.09 and 28.21 at the respective center frequency of each BPF. The three LC resonant BPFs simulated using above ML inductors and capacitor have yielded bandwidths of 1200, 950 and 800 MHz respectively at respective center frequencies of 4.9, 5.5 and 5.25 GHz. The three filters have shown good return loss of -19.8, -27.5 and -30.96 dB respectively. Also they have produced excellent insertion loss of -0.67, -0.49 and -0.37dB. BPF designed employing the double split inductor gave 0.3113 dB (53%) lower insertion loss and 11.2 dB (156%) lower return loss, compared to constant width inductor BPF. The double split inductor BPF showed 0.1369 dB (72%) lower insertion loss and 3.41 dB (112%) less return loss, against the variable width spiral inductor BPF. All the three filters are designed with same on chip occupied area of only 0.068 mm2. The filter models are simulated in HFSS, as per the physical parameters obtained. We found that it has least occupied area against the reported bandpass filters under reference. These simulation results clearly indicate that the developed bandpass filters possess excellent responses that will surely satisfy the sub-6GHz band 5G WLAN access applications.