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- Title
A Compact Widely Tunable Bandpass Filter Dedicated to Preselectors.
- Authors
Magnuski, Mirosław; Wójcik, Dariusz; Surma, Maciej; Noga, Artur
- Abstract
This article presents a novel compact widely tunable bandpass filter. The filter consists of two resonators that are double-coupled, inductively, where the coupling inductances are elements of the input and output networks. The application of double-coupling enabled the transmission zero next to the upper cutoff frequency. This makes the filter useful for applications in preselector networks used in receiving systems with a low to intermediate frequency with the desired channel frequency lower than the image channel frequency. The article shows the practical realisation of the varactor-tuned example filter fabricated as a microstrip planar network of an overall size of 0.03 λ g × 0.045 λ g . The tuning range of the proposed filter is from 410 MHz to 880 MHz with the fractional bandwidth equal to 7.5–8.1% and an in-band insertion loss better than −3.4 dB. The achieved IP3 value exceeds 17.5 dBm.
- Subjects
BANDPASS filters; TRANSMISSION zeros; INSERTION loss (Telecommunication); MICROSTRIP filters; ELECTRIC inductance; RESONATORS
- Publication
Electronics (2079-9292), 2021, Vol 10, Issue 18, p2315
- ISSN
2079-9292
- Publication type
Article
- DOI
10.3390/electronics10182315