Abstract
Two-stage bandpass filters with a sharp transition band are presented. The two stages are cascaded by a direct coupling scheme, as well as a three-line structure. Each half-wave resonator Is tapped with a quarter-wave open stub at its center and a transmission zero can be created. The positions of the two zeros can be easily tuned to locate close to the passband, so that an elliptic function-like response can be obtained. Both uniform impedance resonators (UIRs) and stepped impedance resonators (SIRs) are employed in the design. Experimental results show a close agreement with the design.
| Original language | English |
|---|---|
| Pages (from-to) | 1609-1612 |
| Number of pages | 4 |
| Journal | IEEE MTT-S International Microwave Symposium Digest |
| Volume | 3 |
| State | Published - 2004 |
| Externally published | Yes |
| Event | 2004 IEEE MITT-S International Microwave Symposium Digest - Fort Worth, TX, United States Duration: 06 06 2004 → 11 06 2004 |
Keywords
- Elliptic function filters
- Microstrip circuit
- Stepped impedance resonator
- Transmission zero