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Piekarz, <i>et al.<\/i>: \u201cMeandered coupled-line single-section directional coupler designed in multilayer LTCC technology,\u201d 2012 20th Telecommunications Forum, TELFOR 2012 (2012) 983 (DOI: 10.1109\/TELFOR.2012.6419374).","DOI":"10.1109\/TELFOR.2012.6419374"},{"key":"7","doi-asserted-by":"publisher","unstructured":"[7] S. Gruszczynski, <i>et al.<\/i>: \u201cDesign of compensated coupled-stripline 3-dB directional couplers, phase shifters and magic-Ts \u2014 Part I: Single section coupled line circuits,\u201d 2012 20th Telecommunications Forum, TELFOR 2012 (2006) 3986 (DOI: 10.1109\/TMTT.2006.884689).","DOI":"10.1109\/TMTT.2006.884689"},{"key":"8","doi-asserted-by":"publisher","unstructured":"[8] K. Yamamotoet al.: \u201cHigh-directivity enhancement with passive and active bypass circuit techniques for GaAs MMIC microstrip directional couplers,\u201d IEEE Trans. Microw. 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