LOW COMMON MODE RESONANCE MULTIBAND RADIATING ARRAY

摘要

A higher band radiating element for use in a multiband antenna includes first and second dipole arms supported by a feedboard. The feedboard includes first and second matching circuits, each comprising a capacitor-inductor-capacitor (CLC) matching circuit. The matching circuit further includes a CM tuning circuit connecting a portion of the matching circuit to ground via a microstrip trace selected to pass lower band currents while blocking higher band currents. The CM tuning circuit moves the common mode resonance of the higher band support PCB down below the operating frequency of additional, lower band radiating elements present in the multiband antenna, which is preferable to moving the common mode resonance above the lower band frequencies.

主权项

1. A higher band radiating element for a multiband antenna having at least higher band elements and lower band elements, comprising:
a. first and second dipole arms, each dipole arm having a capacitive coupling area; and b. a feedboard having a balun and first and second matching circuits coupled to the balun, the first matching circuit being coupled to the first dipole arm and the second matching circuit being coupled to the second dipole arm, the first and second matching circuits each comprising in series:
1. a stalk, coupled to the balun,2. a first capacitive element;3. an inductor; and4. a second capacitive element, the second capacitive element being coupled to a dipole arm; each matching circuit further comprising a common mode tuning circuit connecting the first capacitive element and the inductor to the stalk to move the common mode resonance of the matching circuits to a frequency below the lower band frequency.