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Content Provider | IET Digital Library |
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Author | Borah, Dubari Kalkur, Thottam S. |
Abstract | An ultra-compact multi-band balanced (differential) bandstop filter (BSF) topology with all lumped elements has been introduced for the first time in this study. The proposed filter is a four-port structure where each symmetrical bisection is a series cascade of K N-band cells. Each N-band cell comprises of N parallel resonant circuits connected to the same node, through capacitors. K series-coupled N-band filter sections in the symmetrical bisection exhibit a Kth order N-band BSF response in differential mode (DM) whereas common mode (CM) signal is minimally affected and maintains a high CM rejection ratio (CMRR). The advantages associated with this engineered structure can be summarised as follows: (i) it can be extrapolated to realise an arbitrary number of DM stopbands; (ii) it does not need any additional component in the symmetry plane to suppress the CM noise; and (iii) it occupies a very small area. For demonstration, a second-order dual-band differential BSF with resonant frequencies 1.15 and 1.36 GHz is designed and fabricated. It offers a rejection level of about 25 dB for each DM stopband and maintains a CMRR value of about 25 dB for both bands. Moreover, it covers an area of only 0.003 λ g 2 , where λ g is the guided wavelength at the centre frequency between the two bands. |
Starting Page | 755 |
Ending Page | 759 |
Page Count | 5 |
Volume Number | 2020 |
e-ISSN | 20513305 |
Issue Number | Issue 9, Sep (2020) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/joe/2020/9 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/joe.2019.1094 |
Journal | The Journal of Engineering |
Publisher | The Institution of Engineering and Technology |
Publisher Date | 2020-04-29 |
Access Restriction | Open |
Rights License | Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) |
Subject Keyword | Band-stop Filter CM Noise Suppression CM Rejection Ratio Common Mode Signal Differential Mode DM Stopband Dual-band Differential BSF Four-port Structure Frequency 1.15 GHz Frequency 1.36 GHz K N-band Cell K Series-coupled N-band Filter Sections Kth Order N-band BSF Response Lumped Element Microwave IC Multiband Bandtop Filter Parallel Resonant Circuit Passive Filter Passive Network Resonant Frequency Resonator Filter Symmetrical Bisection UHF Filter UHF Integrated Circuit Ultra High Frequency Application Ultra-compact Multiband Balanced Bandtop Filter Topology Waveguide And Microwave Transmission Line Component |
Content Type | Text |
Resource Type | Article |
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