This document summarizes the design of a compact dual-band bandpass filter with high isolation for GPS and WLAN applications. The filter is designed using stepped impedance resonators to achieve dual passbands at 1.575 GHz for GPS and 2.4 GHz for WLAN in a small size of 30.14mm x 21.16mm. It provides high isolation of 55 dB between the two passbands and wide upper stopband rejection of 38 dB from 2.7 to 5.3 GHz. The circuit was simulated based on the provided dimensions and matches well with the frequency response reported in the original paper.

1. EE5601 PROJECT Design of the Compact Dual-Band Bandpass Filter With High Isolation for GPS/WLAN ApplicationsYu-Chi Chang, Chia-Hsiung Kao, Min-Hang Weng GROUP MEMBERS: NADIM ISLAM AMMAR HUSSAIN KHAN STUDENT ID: 4111805STUDENT ID: 3759630

2. Introduction Dual-Band BPF using SIR (stepped impedance resonator) is designed as a novel method to fulfill the need in smaller multi-service wireless communication devices. Dual passbands at 1.575 GHz (GPS) and 2.4 GHz (WLAN). Small-size – 30.14mm x 21.16mm High isolation between passbands – 55 dB Wide upper stopband – 38 dB from 2.7 to 5.3 GHz

3. Resonant Characteristic of the Asymmetric SIR with one step discontinuity Input Admittance Impedance Ratio Length Ratio

4. ‘Dual-Band’ Characteristic Impedance Ratio Length Ratio GPS- 1.575 GHz WLAN- 2.4 GHz f1/f0 = 1.524 α = 0.625

5. Simulated Circuit Circuit simulated based on provided dimensions

6. Frequency Response Comparison Response from paper (Simulations using IE3D) Response from simulation (Simulations using SONNET)

7. Passbands Frequency Comparison Paper Paper Our Our Passband at 1.575 GHz Passband at 2.4 GHz

8. THANK YOU