| 摘要 |
A microstrip capacitively-compensated directional coupler with improved directivity and decreased coupling length. The directional coupler of the invention includes a primary transmission line, having a first port and a second port and a secondary transmission line electromagnetically coupled to the first line. The secondary transmission line has a third port and a fourth port. The invention also calls for a first reactive coupling network disposed between the first port and the third port, and a second reactive coupling network disposed between the second port and the fourth port. Those reactive couplings improve the directivity of the coupler and foreshorten its coupling length. The invention also calls for a phase-shifting line for shifting the phase of the coupled signal. The phase-shifting line further foreshortens the required coupling length for the coupler.
|
