A wideband tunable quadrature coupler with flat coupling
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Henning Mextorf
and
Winfried Schernus
Abstract
This paper presents a wideband reconfigurable coupler with tunable coupling ratios. It consists of two 3 dB quadrature couplers and two varactor-based continuously tunable reflection networks. The instantaneous bandwidth is enhanced by adding matching networks at all four ports. The proposed four port with reflection symmetry offers a return loss greater than 15 dB and an isolation greater than 20 dB through a fractional bandwidth of 23 % while exhibiting a very flat response. The coupling ratio can be tuned from −9 dB to 0.1 dB.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: The raw data can be obtained on request from the corresponding author.
References
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Articles in the same Issue
- Frontmatter
- A wideband tunable quadrature coupler with flat coupling
- Small size dual-band coupled-line coupler for WiMAX applications
- A flexible wideband wearable CPW antenna for WBAN application
- A dual-band dual-mode customer premises equipment antenna
- A compact multiband frequency reconfigurable antenna integrated with sextuple band artificial magnetic conductor for heterogeneous wireless applications
- A wideband reconfigurable filtering phase shifter based on Stub-loaded multimode resonators
- Balanced tri- and quad-band BPFs based on SIR with improved passbands selectivity
- A metasurface with three different configurations for absorption, transmission or reflection of incident electromagnetic waves
- Experimental study on thermal cycling of nano-silver and nano-silver coated tin flip solder joints
