Table 1 Optimal geometric values of DB-BPF
From: A compact conductor-backed CPW-based dual bandpass filter for satellite S-band and C-band
Filter element | Description | Dimensions | Filter element | Description | Dimensions |
|---|---|---|---|---|---|
L1 | Length of feed line | 8 | G1, G3 | Inter-digital coupling gap | 0.3 |
L2 | Length of inter-digital coupling | 8.3 | G2 | Coupling line resonator gap | 0.4 |
L3 | Length of middle inter-digital coupling | 6 | W1 | Width of feed line | 3.2 |
L4 | Length of outer inter-digital coupling | 8.2 | W2 | Width of inter-digital coupling | 0.5 |
L5 | Diameter of circular resonator | 5 | W3 | Width of middle inter-digital coupling | 0.3 |
L6 | Length of open stubs | 3.5 | W4 | Width of open stub | 1 |
L7 | Height of open stubs | 1 | W5 | Width of outer coupling line | 0.2 |