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Key Features

  • Range of Frequencies to Cover Wireless Device Bands
  • Designed for CTIA Ripple Test
  • Meets CTIA +/- 0.1 dB Symmetry Requirement
  • Download PDF Datasheet
  • ETS-Lindgren's Series 3127 Resonant Loops are designed to meet the Cellular Telecommunication and Internet Association's (CTIA) 0.1 dB symmetry requirement for ripple test measurements at the labeled center frequency. These omnidirectional antennas have a magnetic dipole pattern approaching that of a half-wave resonant electric dipole. The pattern produced has the same peak and null orientation as that of a sleeve dipole oriented along the same axis, but with the directions of the electric and magnetic fields reversed. That is, the electric field vector along the azimuth is perpendicular to the axis and the magnetic field vector is parallel to the axis. The loop design allows the antenna to be end-fed to avoid cable and feedpoint interactions that interfere with the symmetry of the antenna. Integral quarter-wave chokes and/or ferrite loading (depending on frequency range) also help to reduce cable interaction. This design also provides exceptional symmetry to meet the CTIA criteria for ripple test antennas.

    All 3127 resonant loops are designed with better than +/- 0.1 dB symmetry (0.2 dB peak-to-null) in at least a +/- 5 MHz band around the labeled center frequency. VSWR is less than 5: 1 at the resonant frequency, which is slightly higher than the labeled symmetry frequency. For reference purposes, gain and symmetry values are provided for a 200-300 MHz band (depending on model) centered about the labeled frequency. The loops have a nominal 50 impedance, a maximum continuous transmit power of one watt, and are equipped with a female SMA connector.

    The loops are calibrated using an A2LA accredited process with a typical measurement uncertainty on the order of +/- 1.0 dB at the center frequency. During the calibration process, the dipoles are also certified to meet the +/- 0.1 dB symmetry required for use in the ripple test specified in the CTIA's Over-The-Air Performance Test Plan, in a +/- 5 MHz band around the labeled center frequency. Maximum ripple, VSWR, and approximate gain values are provided with each calibration. Note that the gain values provided with this calibration is for diagnostic reference purposes only. For accurate gain values to perform range calibration, the ETS-Lindgren Model 3126 Precision Reference Sleeve Dipoles are recommended.

    Specifications
    View the 3127 Magnetic Dipole Antenna technical specifications below

    Physical Specifications

    Model
    Mounting Diameter
    Loop Housing Diameter
    Overall Length
    3127-3600
    1.9cm (0.75in)
    3.7cm (1.46in)
    16.3cm(6.5in)
    3127-5500
    1.9cm (0.75in)
    2.8cm (1.1in)
    16.3cm (6.5in)
    All Other 3127 Models
    1.9cm (0.75in)
    12.7cm (5.0in)
    21.6cm (8.5in)

    Electrical Specifications

    Connector Type (All Models): SMA Female
    Impedance (Nominal; All Models): 50
    Maximum Continuous Power (All Models): 1W
    VSWR (All Models): <5:1 Typical

    Model Frequency Range
    Model
    Frequency Range
    3127-450
    440 MHz to 460 MHz
    3127-617
    607 MHz to 627 MHz
    3127-700
    690 MHz to 710 MHz
    3127-850
    840 MHz to 860 MHz
    3127-880
    870 MHz to 890 MHz
    3127-920
    910 MHz to 930 MHz
    3127-1575
    1565 MHz to 1585 MHz
    3127-1732
    1722 MHz to 1742 MHz
    3127-1747
    1737 MHz to 1757 MHz
    3127-1768
    1758 MHz to 1778 MHz
    3127-1790
    1780 MHz to 1800 MHz
    3127-1800
    1870 MHz to 1890 MHz
    3127-1862
    1858 MHz to 1878 MHz
    3127-1880
    1870 MHz to 1890 MHz
    3127-1950
    1940 MHz to 1960 MHz
    3127-2100
    2090 MHz to 2110 MHz
    3127-2132
    2122 MHz to 2142 MHz
    3127-2140
    2130 MHZ to 2150 MHz
    3127-2150
    2140 MHz to 2160 MHz
    3127-2450
    2440 MHz to 2460 MHz
    3127-2535
    2525 MHz to 2545 MHz
    3127-2600
    2590 MHz to 2610 MHz
    3127-2655
    2645 MHz to 2665 MHz
    3127-3600
    3590 MHz to 3610 MHz
    3127-5500
    5490 MHz to 5510 MHz