Weakly coupled directional coupler with simultaneous wide bandwidth and high directivity

Weakly coupled directional couplers are known to have poor directivities and narrow bandwidths. In order to improve both parameters simultaneously, this article demonstrates for the first time, that combination of shunt reactive loading and external impedance matching, results in high directivity, a...

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Bibliographic Details
Published in:Microwave and optical technology letters 2019-05, Vol.61 (5), p.1259-1262
Main Authors: Hammad Akhtar, M., Ayaz Zakir, M., Cheema, Hammad M.
Format: Article
Language:English
Subjects:
Broadband
coupled‐line coupler
Directional couplers
Directivity
high directivity
Impedance matching
intrinsic impedance
isolation enhancement
Order parameters
Substrates
weakly coupled
Citations: Items that this one cites
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Summary:Weakly coupled directional couplers are known to have poor directivities and narrow bandwidths. In order to improve both parameters simultaneously, this article demonstrates for the first time, that combination of shunt reactive loading and external impedance matching, results in high directivity, and wideband performance. The proposed directional coupler, fabricated on a Rogers 6035HTC substrate, demonstrates directivity greater than 20 dB over a fractional bandwidth of 35%, which is the highest reported for microstrip based design having weak coupling factor of 30 dB.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.31723