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1. (WO2005109975) BROADBAND BALANCE-TO-UNBALANCE TRANSFORMER

Pub. No.:    WO/2005/109975    International Application No.:    PCT/EP2005/003957
Publication Date: Nov 17, 2005 International Filing Date: Apr 14, 2005
IPC: H01P 5/10
H05K 1/16
Applicants: ROHDE & SCHWARZ GMBH & CO. KG
KAEHS, Bernhard
Inventors: KAEHS, Bernhard
Title: BROADBAND BALANCE-TO-UNBALANCE TRANSFORMER
Abstract:
The invention relates to a balance-to-unbalance transformer (balun) comprising a first signal input/output (1) with two symmetrical poles (2, 3), a second signal input (4) with one pole (5), several first conductor loop regions (6, 9, 10), which are located between the two poles (2, 3) of the first signal input (1) and the ground (7) and a second series connection (11) of several conductor loop regions (12, 13), the first terminal (14) of the latter being connected to the pole (5) of the second signal input (4). Two second conductor loop regions (12, 13) are electromagnetically coupled to a respective conductor loop region (6, 9). The second outer terminal (15) of the second series connection (11) of several second conductor loop regions (12, 13) is electrically connected to the intermediate terminal (16) of a first series connection (8) of several first conductor loop regions (9, 10), which connect a symmetrical pole (2) of the first signal input (1) to the ground (7).