Rectangular Horns, Conical Horns, and Lens Corrected Antennas

Photo 2SAGE Millimeter offers many aperture antennas.
The popular ones are:

SAGE Millimeter Rectangular Horn Antenna
Rectangular Horns (SAR series)
SAGE Millimeter Conical Horn Antenna
Conical Horns (SAC series)
SAGE Millimeter Lens Corrected Antenna
Lens Corrected Antennas (SAL Series)

There are two common questions we often receive from our customers:

  1. Do we have 30 dB or higher gain rectangular or conical horn antennas?
  2. Do lens corrected antennas make the beamwidth narrower?

In this post we will address these questions.

  1. Do we have 30 dB or higher gain rectangular or conical horn antennas?
    SAGE Millimeter’s rectangular and conical horn antennas are mainly designed and fabricated for low gain, such as 25 dBi or less applications. To minimize the phase error caused by increasing the aperture size, the length of the horn must be increased proportionally. It is well known that the sidelobe level of the aperture antenna is mainly caused by the phase error. Theoretically, the sidelobe level reduction can be achieved by increasing the length of the horn. However, there is a practical limitation on the length (size) of the antenna. SAGE Millimeter chooses to offer 25 dBi gain as the maximum for simple rectangular and conical horn antennas in order to not compromise the size, performance, and cost. For higher gain aperture antenna requirements, SAGE Millimeter recommends its SAL series, the lens corrected antenna. The lens corrected antenna offers moderate size and phase error reduction with up to 40 dBi gain for high millimeterwave frequencies. The lens antenna can be configured in rectangular or circular aperture shapes. Due to manufacturing costs, higher gain aperture antennas are covered by the SAG series Gaussian optics antenna family. The in-phase beam confining of the Gaussian optics antenna is accomplished with a scalar feed horn and a focal lens spatially. Therefore, the Gaussian optics antenna offers a well defined Gaussian beam and very high aperture efficiency.

    SAGE Millimeter Gaussian Optics Antenna
    Gaussian Optics Antenna
  2. Do lens corrected antennas make the beamwidth narrower?
    The beamwidth of the antenna is solely aperture size dependent. It is governed by physics, therefore, the lens or dielectric material does not affect the beamwidth. This confusion may be caused by the gain and beamwidth data published from various manufacturers for various antennas. For lossless antennas, the beamwidth and gain product is a constant for a given aperture size. However, the aperture efficiency varies with the antenna type tremendously. For instance, the Gaussian optics antenna can have as high as 95% aperture efficiency while the microstrip array antenna may only have a 25% aperture efficiency. This difference dictates a 6 dB gain difference for the same aperture size.

    SAGE Millimeter Antenna Mounting Fixture
    Antenna Mounting Fixture

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