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Low-cost wideband double-layer microstrip coupled-line directional coupler with high directivity

Bibliographic reference Kazemi Esfeh, Babak ; Raskin, Jean-Pierre ; Van Moer, Wendy. Low-cost wideband double-layer microstrip coupled-line directional coupler with high directivity. In: Microwave & Optical Technology Letters, Vol. 56, no. 7, p. 1570-1575 (2014)
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