Abstract
This letter presents the design and realization of a new compact bandpass filter (BPF) fabricated on multilayered ceramic substrates. This BPF features coupled resonators with negative coupling coefficients. A BPF with center frequency 2.45 GHz is designed and fabricated. Its size is only 2.0 mm × 1.8 mm × 0.67 mm when implemented by a standard low temperature co-fired ceramic technology. The size reduction is due to the higher coupling coefficient between the negatively-coupled resonators than the positively-coupled ones, allowing tighter space between the resonators. The measured insertion losses of the previous BPF were less than 3 dB and return losses more than 18 dB in the passband. The measured result agrees very well with the electromagnetic (EM) designed response.
Original language | English |
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Pages (from-to) | 641-643 |
Number of pages | 3 |
Journal | IEEE Microwave and Wireless Components Letters |
Volume | 15 |
Issue number | 10 |
DOIs | |
State | Published - 10 2005 |
Keywords
- Bandpass filter (BPF)
- Filters
- Low-temperature co-fired ceramic (LTCC)
- Lumped element microwave circuits