Compact balun for rejecting common mode electromagnetic fields

Details Compact balun for rejecting common mode electromagnetic fields Compact balun for rejecting common mode electromagnetic fields

2005-09-20

2005-09-20

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By pulse coincidence

C327S033000

Reexamination Certificate

active

06946880

ABSTRACT:
A space-efficient broadband balun (20). The balun (20) includes a first mechanism (44, 80, 82, 94, 96) for receiving an input signal (52, 54) having an undesirable component. A second mechanism (50) rejects the undesirable component via a waveguide transition (50). In a specific embodiment, the undesirable component is a common mode component. The first mechanism (44) includes an input microstrip waveguide (44). The waveguide transition (50) is a single microstrip-to-slotline transition (50) from the input microstrip waveguide (44) and to a slotline (32) in a ground plane (34, 36) of the microstrip waveguide (44). The slotline (32) is terminated at a first end (38) via a wedge (40) in the ground plane (34, 46). A second end (42) of the slotline (32) provides an output of the balun (20). The input signal (52, 54) includes a first input signal (52) and a second input signal (54), which are input at opposite ends (38, 42) of the input microstrip waveguide (44). The first input signal (52) and the second input signal (54) have a desired differential mode component and an undesired common mode component.

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Kim, Jeong Phil et al. “Novel Configurations of Planar Multilayer Magic-T Using Microstrip-Slotline Transitions,” IEEE Trans. on Microwave Theory and Techniques, vol. 50, no. 7, Jul. 2002.
Patent Abstracts of Japan, vol. 009, no. 216 (E-340), Sep. 3, 1985 and JP 60 075101 A (Sony KK), Apr. 27, 1985 abstract; figure 2.

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