Low common mode resonance multiband radiating array
DCFirst Claim
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; and
4. 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.
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Abstract
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.
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Citations
19 Claims
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1. A higher band radiating element for a multiband antenna having at least higher band elements and lower band elements, comprising:
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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; and 4. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A multiband antenna, comprising:
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a. a first array of first radiating elements having a first operational frequency band; and b. a second array of second radiating elements having a second operational frequency band, the second operational frequency band being higher than the first operational frequency band, the second radiating elements further 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; and 4. a second capacitive element, the second capacitive element being associated with one of the first and second dipole arms, each matching circuit further comprising a common mode tuning circuit connecting the first capacitive element and the inductor to the stalk, the common mode tuning circuit comprising a microstrip line dimensioned to short any induced low band currents to the stalk without substantially affecting high band currents, thereby moving common mode resonance down below the second operational frequency band.
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14. A higher band radiating element for a multiband antenna having at least higher band elements and lower band elements, comprising:
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a first dipole arm; a second dipole arm; 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 matching circuit comprising a first stalk that is coupled to the balun and a first capacitor coupled between the first stalk and the first dipole arm, and the second matching circuit comprising a second stalk that is coupled to the balun and a second capacitor coupled between the second stalk and the second dipole arm, wherein the first matching circuit further comprises a common mode tuning circuit that provides a direct current path from a first node that is between the first capacitor and the first dipole arm to ground. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification