RF Electronics Chapter4: Transmission Line Transformers and Hybrids Page 106
2022, C. J. Kikkert, James Cook University, ISBN 978-0-6486803-9-0.
Figure 4.70 shows the magnitude frequency response of the Stripline Parallel Line Balun
and figure 4.71 shows the phase response. Comparing this with figures 4.63, 4.64, 4.67
and 4.68, show that the Stripline Parallel Line Balun has a better magnitude performance
and a similar phase performance than Stripline Marchand Balun of figure 4.66, and a
much better performance than the Microstrip Lange Marchand Balun of figure 4.62.
Wireline and Wirepac Couplers
Sage Laboratories, now part of API Technologies Corp, filed a patent for Wireline [22,23]
couplers in 1983. These couplers consist of a coaxial cable like structure, except for the
inner conductor, two conductors with a controlled spacing is used as shown in figure 4.72.
Figure 4.72 Wireline (left) and Wirepac (right) couplers.
Wireline uses a smaller diameter cables, can be bent to put a long line in a small space
and can handle 100 W or 200 W continuously, Wirepac [23] cannot be bent and can
handle up to 500 W continuously. The operating frequency range is from about 50 MHz
(940 mm long wireline) to more than 5 GHz (9.4 mm long wireline). The upper frequency
limit is simply determined by the ability to connect to the coupled conductors.
Figure 4.73 Wireline amplitude response.
RF Electronics: Design and Simulation
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