| 摘要 |
<p>A balanced dipole antenna (100) has a coaxial cable connected between a load or source and the left (101) and right (102) dipole arms to substantially eliminate common mode current and radiative coupling between the coaxial cable and the left and right dipole arms. The connection between the source/load coaxial cable and the left and right dipole arms is a symmetric balun (110) having a center branch that is an extension of the source/load coaxial cable, and left and right stubs. When the stubs are segments of coaxial cable, the outer conductors (105,125) of the left and right stubs of the symmetric balun are respectively coupled to the left and right dipole arms (101,102), and one of the inner conductors (106) of the left and right stubs is connected to the inner conductor of the center branch (116), while the other of the inner conductor (126) of the left and right stubs is connected to the outer conductor of the center branch (115). When the stubs are metallic, the inner conductor of the center branch is electrically connected to one of the left and right dipole arms, while the outer conductor of the center branch is electrically connected to the other of the left and right dipole arms. A sliding bar (108) at the base of the stubs electrically connects the outer conductors (105,125) of the left and right stubs and the center branch (115).
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