Binti Mohd Najib, N, Somjit, N orcid.org/0000-0003-1981-2618 and Hunter, I orcid.org/0000-0002-4246-6971 (2018) Design and Characterisation of Dual-Mode Suspended-Substrate Stripline Filter. IET Microwaves, Antennas and Propagation, 12 (9). pp. 1526-1531. ISSN 1751-8725
Abstract
A new design technique of a dual-mode ring-resonator suspended-substrate stripline filter is reported here to achieve low passband insertion loss, high quality factor, and good spurious response. A fourth-order bandpass filter was designed and fabricated at the operational frequency of 2.07 GHz with two ring resonators packaged in a metallic cavity where each ring resonator is one wavelength long. The transmission zeros of the dual-mode filter are generated due to the phase cancellation between the two paths in a ring, thus a sharp-skirt selectivity filter response was achieved. Perturbation notch structure was implemented on each ring resonator to provide the electromagnetic coupling of two degenerate modes, thus a dual-mode response of the filter can be synthesised. Measurement results of the first dual-mode filter prototype showed a return loss and an insertion loss of better than 16.42 and 0.926 dB, respectively, while an out-of-band rejection of up to 55 dB was achieved. The novel filter design technique proved that no cross-coupling is required to obtain the transmission zeros of the filter, thus the sharp-skirt response was achievable.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 The Institution of Engineering and Technology. This paper is a postprint of a paper submitted to and published in IET Microwaves, Antennas and Propagation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at the IET Digital Library. |
Keywords: | band-pass filters; cavity resonator filters; electromagnetic coupling; low-pass filters; Q-factor; strip line filters; strip line resonators; UHF filters; UHF resonators |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 09 Feb 2018 10:10 |
Last Modified: | 19 Jul 2018 20:00 |
Status: | Published |
Publisher: | Institution of Engineering and Technology |
Identification Number: | 10.1049/iet-map.2017.1136 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:127212 |