2020 50th European Microwave Conference, EuMC 2020
- Fecha: 12 January 2021
- Páginas: 120-123
- ISBN: 9782874870590
- Source Type: Conference Proceeding
- DOI: 10.23919/EuMC48046.2021.9338231
- Document Type: Conference Paper
- Publisher: Institute of Electrical and Electronics Engineers Inc.
© 2021 EuMA.This work characterizes the undesired coupling effect that appears in stub loaded microstrip Ka-band filters due to the propagation of surface waves. This effect limits the achievable isolation level in the stopband of this type of filters. To overcome this limitation, we propose two solutions: alternate the direction of the resonator stubs and implement the filter following a bent configuration. To validate these solutions in practical microstrip devices, four stopband filters in Ka-band are designed, manufactured and measured. The measurements demonstrate that these two strategies allow to improve the selectivity in the stopband, therefore improving the isolation level in stub loaded microstrip filters.