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On the possibility of a perfect power combiner
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
2017 (English)In: Progress In Electromagnetics Research, ISSN 1070-4698, E-ISSN 1559-8985, Vol. 158, p. 1-6Article in journal (Refereed) Published
Abstract [en]

By reductio ad absurdum, we show that a perfect power combiner of single-mode waveguides is impossible for incoherent input waves of the same frequency and same polarization as it is against the law of conservation of energy. The inevitable 3 dB loss of a three-port power combiner is explained physically. An incoherent power combiner of nearly 100% efficiency can be realized only if the two input fields have different wavelengths, have different polarizations, or are of orthogonal modes.

Place, publisher, year, edition, pages
Electromagnetics Academy , 2017. Vol. 158, p. 1-6
Keywords [en]
Condensed matter physics, Radiation, Input field, Input waves, Law of conservation of energy, nocv1, Orthogonal modes, Power combiner, Single mode waveguides
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-201575ISI: 000396746700001Scopus ID: 2-s2.0-85000936762OAI: oai:DiVA.org:kth-201575DiVA, id: diva2:1073301
Funder
Swedish Research Council, 621-2011-4620
Note

QC 20170210

Available from: 2017-02-10 Created: 2017-02-10 Last updated: 2017-11-29Bibliographically approved

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