| 摘要 |
A balanced hybrid coupler comprising four identical pairs of quarter wavelength parallel coupled lines, 45A, 45B and 46A, 46B a first input port, a second input port, a first output port and a second output port. The first input port comprising a pair of signal carrying terminals 41A, 41B, the second input port comprising a pair of signal carrying terminals 42A, 42B, the first output port comprising a pair of signal carrying terminals 43A, 43B, and the second output port comprising a pair of signal carrying terminals 44A, 44B. A wiring section 49 connects quarter wavelength coupled line pairs 45A and 45B to quarter wavelength coupled line pairs 46A and 46B, and includes a first balanced connection comprising a pair of connection lines 47A, 47B and a second balanced connection comprising connecting lines 48A, 48B. Connection line 47A connects one of the pair of coupled lines 45A to one of the pair of coupled lines 46A, and connection line 47B connects one of the pair of coupled lines 45B to one of the pair of coupled lines 46B. A twist is added to the balanced connection comprising connecting lines 48A and 48B so that connecting line 48A connects one of the pair of quarter wavelength coupled lines 45A to one of the pair of quarter wavelength coupled lines 46B and so that connecting line 48B connects one of the pair of quarter wavelength coupled lines 45B to one of the pair of quarter wavelength coupled lines 46A. The twist in the balanced connection comprising connecting line 48A and 48B produces the required phase shift of 180°. The balanced 180° hybrid coupler of the present invention is considerably more compact than a balanced 180° hybrid coupler comprising a pair of prior art single-ended hybrid couplers due to the fact that the 180° phase shifting element is realized by adding a twist in the wiring section 49 as opposed to using conventional phase shifting networks.
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