Stripline directional coupler tolerant of substrate variations

Details Stripline directional coupler tolerant of substrate variations Stripline directional coupler tolerant of substrate variations

H - Electricity

01

P

H01P 5/18 (2006.01)

Patent

CA 2231847

A stripline directional coupler (40) having a quarter-wave transmission line (54, 62) added either between the isolation port (52) of the coupler and the termination impedance (56) or between the input port of the coupler and the signal input (46) reduces the degradation of coupler directivity caused by impedance mismatch of the transmission lines (42, 44) with the source, load and/or termination impedances (56). With the transmission lines (42, 44) and additional quarter-wave transmission line (54, 62) formed on the same substrate material, coupler directivity is insensitive to the value of the characteristic impedance of the transmission lines (42, 44). This allows the use of less expensive substrate materials and manufacturing processes during stripline directional coupler construction.

Coupleur (40) directionnel à ligne microruban doté d'une ligne de transmission quart d'onde (54, 62) ajoutée soit entre l'accès d'isolation (52) du coupleur et l'impédance de terminaison (56) ou entre l'entrée du coupleur et l'entrée (46) de signaux, qui réduit la dégradation de la directivité du coupleur causée par des écarts d'impédance entre les lignes de transmission (42, 44) et les impédances (56) de source, de charge et/ou de terminaison. En raison de la formation sur le même matériau substrat des lignes de transmission (42, 44) et de la ligne de transmission quart d'onde (54, 62) supplémentaire, la directivité du coupleur est insensible à la valeur de l'impédance caractéristique des lignes de transmission (42, 44). Cela permet de recourir à des matériaux de substrat et à des procédés de fabrication moins onéreux pour la construction dudit coupleur directionnel à ligne microruban.

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