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    AN-SOF passes IEC 62232 validation
    10May, 2023
    AN-SOF 8.20 Passes IEC Validation

    The latest version 8.20 of the AN-SOF calculation engine has successfully completed validation for accuracy in accordance with the standard IEC FDIS 62232.

    This standard outlines guidelines for calculating radio-frequency field strength and specific absorption rate (SAR) in the vicinity of radiocommunication base stations (RBS) to assess the potential human exposure.

    Specifically, the validation of the AN-SOF calculation engine was conducted for the “Antenna with Dipole Radiators” in the aforementioned standard. This significant achievement enhances the reliability of the AN-SOF Antenna Simulator.

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    AN-SOF passes IEC 62232 validation
    AN-SOF passes IEC validation

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    Blog > Antennas and Beyond!

    Modeling a J-Fed 5-Element Collinear Antenna for the 2 m Band.
    2Mar, 2023
    Modeling a J-Fed 5-Element Collinear Antenna for the 2 m Band

    If you’re looking for a high-performing omnidirectional antenna, consider this design. It boasts 5 collinear radiant elements that are connected by phasing coils. The feed point is conveniently located at the base of the antenna on a J dipole. By adjusting the position of the feed point along the J, you can minimize the SWR. At the top end of the antenna, you’ll find a small loop that serves as a tie point, measuring just 1/2″ in diameter. The total length of the antenna is 295″. Each coil features 32 turns and has a diameter of 5/8″.

    To accurately model this design, we should use simulation software that is capable of modeling curved wire segments and small, closely-spaced wires. With AN-SOF, you can use the “Helix” object to perfectly model each coil. By using only one segment per turn, this model demonstrates the efficiency of AN-SOF in simulating complex designs.

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    Modeling a J-Fed 5-Element Collinear Antenna for the 2 m Band.
    Modeling a J-Fed 5-Element Collinear Antenna for the 2 m Band.

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    Blog > Antennas and Beyond!

    Simulating a Log-Periodic antenna with AN-SOF.
    31Dec, 2022
    Log-Periodic Christmas Tree

    At Golden Engineering we are passionate about antenna simulation. On this last day of the year we want to give you our Log-Periodic Christmas Tree made with AN-SOF:

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    Simulating a Log-Periodic antenna with AN-SOF.
    Current distribution on a Log-Periodic antenna.

    We thank all our clients, users and people who collaborate so that the AN-SOF Antenna Simulator project continues to grow day by day.

    Happy New Year!

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    Blog > Antennas and Beyond!

    Modeling a Biquad UHF antenna with AN-SOF.
    7Nov, 2022
    Biquad UHF Antenna Array

    This 4-element biquad array resonates at 434 MHz. The wires that connect the driven element to the reflector work as a two-wire transmission line that allows us to obtain an input impedance of 50 + j0 Ohm.

    It may be noticed that the polar plots are on a log scale. ARRL-style log scaling is coming in the December release of AN-SOF!

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    Modeling a Biquad UHF antenna with AN-SOF.
    Modeling a Biquad UHF antenna with AN-SOF.

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    Blog > Antennas and Beyond!

    Modeling a 2-Element Quad Array with AN-SOF.
    22Mar, 2022
    Script for Modeling 2-Element Quad Array

    2-element quad antennas are very popular due to their compact size and gain similar to a more element Yagi. In addition, they can be designed to obtain an input impedance of 50 Ohm.

    This design can operate at 27.5 MHz. We have added a script that allows us to plot the gain and front-to-back ratio as a function of element spacing. See this video >.

    We can see that both cannot be maximized at the same time, but it is preferable to choose the maximum F/B since the gain changes relatively little.

    To create the Scilab script, we started from a basic design in AN-SOF and then exported it as a *.sce file.

    Download Model >

    Download Script >

    Modeling a 2-Element Quad Array with AN-SOF.
    Modeling a 2-Element Quad Array with AN-SOF.

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    Blog > Antennas and Beyond!

    Modeling an Array of Snowflake Quads with AN-SOF.
    20Feb, 2022
    Array of Snowflake Quads

    Nathan Cohen in the US fractalized the quad loop based on the Minkowski square and invented an array of two elements. The biggest advantage of fractal antennas is that we get a wide bandwidth with a small size.

    This simulation shows that we can almost double the bandwidth with a 3-element array. It has a reflector, a driven element, and a director. These are the results for the 20 m band (~ 14 MHz),

    Quad size ~ 290 x 290 cm (0.14 x 0.14 of a wavelength)

    Element spacing ~ 280 cm

    450 KHz bandwidth (VSWR < 2) around 14.5 MHz

    6 dBi gain

    10 dB F/B

    80° beamwidth

    Vertical polarization

    It has less gain than could be achieved with a 3-element Yagi, but it has a relatively large bandwidth and is a very compact antenna. It does not need a matching circuit and its impedance is 50 Ohm at resonance, so it could be fed directly through a 50 Ohm coax.

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    Modeling an Array of Snowflake Quads with AN-SOF.
    Modeling an Array of Snowflake Quads with AN-SOF.

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    Blog > Antennas and Beyond!