A new wideband three-port balun is developed using a standard uniplanar monolithic microwave integrated circuit (MMIC) process. This structure does not rely on bulky resonant circuits, and thus can be realised in a small size and show ultra-wideband characteristics. Out of phase characteristic between two output ports is inherently achieved by field transformations through physical transitions of uniplanar transmission lines. A fabricated back-to-back balun pair showed insertion loss less than 1.85 dB and return loss more than 10 dB over an ultra-wideband frequency range from 1 to 92.5 GHz.
References
-
-
1)
-
B. Schick ,
J. Kohler
.
An improved microstrip-to-microslot transition.
IEEE Trans. Microw. Theory Tech.
,
4 ,
231 -
233
-
2)
-
N. Marchand
.
Transmission-line conversion transformers.
Electronics
,
142 -
145
-
3)
-
Gillick, M., Robertson, I.D.: `Accurate modeling of an ultra-wideband MMIC CPW-to-slotline transition', Asia-Pacific Microwave Conf., 1992, p. 279–282.
-
4)
-
S. Kim ,
S. Jeong ,
Y.T. Lee ,
D.H. Kim ,
J.S. Lim ,
K.S. Seo ,
S. Nam
.
Ultra wideband (from DC to 110 GHz) CPW to CPS transition.
Electron. Lett.
,
13 ,
622 -
623
-
5)
-
Tsai, M.C.: `A new compact wideband balun', IEEE Microwave and Millimeter-Wave Monolithic Circuits Symp., 1993, p. 123–125.
-
6)
-
V. Trifunovic ,
B. Jokanovic
.
Four decade bandwidth uniplanar balun.
Electron. Lett.
,
6 ,
534 -
535
http://iet.metastore.ingenta.com/content/journals/10.1049/el_20064317
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