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| Content Provider | IET Digital Library |
|---|---|
| Author | Chen, Chi Feng Chang, Sheng Fa Zhou, Kai Wei Li, Jhong Jhen Wang, Guo Yun |
| Abstract | Microstrip dual- and triple-band bandpass filters (BPFs) exhibiting an ultracompact size and high frequency selectivity are proposed in this study. A common resonator feeding technique is proposed and was applied to design the multiband BPFs. In the design, the first and last resonators are realised using stepped-impedance resonators and are used to form a passband that has lower operating frequencies than the passband(s) of other resonator(s). Moreover, the first and last resonators serve as the input–output feeding structure and provide a source–load coupling for the passband(s) operating at higher frequencies. Thus, finite transmission zeros can be formed over the stopband. Hence, size miniaturisation and high frequency selectivity can be achieved simultaneously. The higher operating passband(s) is (are) formed by the dual-mode stub-loaded resonator(s) to reduce the number of resonators and the overall size of a filter. To verify the design approach, a dual-band BPF centred at 1.3 and 2.58 GHz with an ultracompact circuit size of 0.048 λ g × 0.088 λ g (λ g: guided wavelength at the central frequency of the lower passband) and a triple-band BPF centred at 1.24, 2.5, and 3.5 GHz with an ultracompact circuit size of 0.15 λ g × 0.12 λ g were designed and fabricated. The measurement and electromagnetic simulation results were in good agreement. |
| Starting Page | 252 |
| Ending Page | 257 |
| Page Count | 6 |
| ISSN | 17518725 |
| Volume Number | 13 |
| e-ISSN | 17518733 |
| Issue Number | Issue 2, Feb (2019) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-map/13/2 |
| Journal | IET Microwaves, Antennas & Propagation |
| Publisher Date | 2018-11-16 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Band-pass Filter Central Frequency Common Resonator Feeding Structure Design Approach Dual-band BPF Dual-mode Stub-loaded Resonator Electromagnetic Simulation Frequency 1.24 GHz Frequency 1.3 GHz Frequency 2.5 GHz Frequency 2.58 GHz Frequency 3.5 GHz Guided Wavelength High Frequency Selectivity Higher Operating Passband Input–output Feeding Structure Lower Operating Frequency Microstrip Filter Microwave Filter Microwave Resonator Multiband BPFs Passive Filter Passive Network Resonator Filter Size Miniaturisation Source–load Coupling Stepped-impedance Resonator Triple-band Bandpass Filter Triple-band BPF UHF Filter UHF Resonator Ultracompact Circuit Size Ultracompact Microstrip Dual-band Bandpass Filter Ultracompact Size Waveguide And Microwave Transmission Line Component |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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