Features

• Features

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  • TEM horn antenna compliant with IEC 61000-4-39 Ed.1 standard.
  • Allows testing to the entire frequency range of 380 MHz – 6 GHz with one antenna.
  • Also supports 6 GHz band Wi-Fi “Wi-Fi 6E” (5.925 – 7.125 GHz).
  • Low VSWR and high GAIN enable efficient electromagnetic wave radiation.
  • Wide field uniformity reduces the number of times of movement of the antenna when radiating the EUT.
  • Can be used for IEC 61000-4-3 preliminary testing in combination with a low-cost/low-output power amplifier by utilizing the proximity characteristics of the antenna.

• Dimensions

  

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• VSWR

  

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• Power required for generating 300 V/m (typ) (at 0.1 m)

  

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• Electric field distribution characteristics

  

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• Close proximity distance characteristics

  

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  ■Distance attenuation characteristics
  * Distance attenuation characteristics on axes with 100 mm from the antenna as the reference point

  

   

  ■Electric field distribution distance characteristics　* Reference point: maximum of 100mm

  

  

  

• Securing Uniform Field Area

  

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  In the actual test, a quadrangle inscribed in the uniform electric field area is created to control the irradiation position. Therefore, a symmetrical electric field distribution characteristic that can create a large square with the maximum point in the center is required.

  

• THA-380M60G and THA-380M70G Comparison Table

  

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  	THA-380M60G	THA-380M70G
  Dimensions, Weight	Good	Excellent
  Frequency range	Excellent	Excellent
  	8 GHz max (*guaranteed up to 6 GHz)	7.125 GHz max
  VSWR	Excellent	Excellent
  	Good VSWR even when facing metallic surfaces
  Required Power (for generating 300 V/m (typ) (at 0.1 m)	Good	Excellent
  Electric field distribution	Excellent	Good
  Distance attenuation characteristics	Excellent	Good
  	Attenuation after the reference point is low, being effective even for products with depth.	Relatively large difference in attenuation characteristics depending on the frequency.
  Electric field distribution distance characteristics	Excellent	Good
  Use in far-field test methods	Excellent	N/A Specifically designed as an antenna for close proximity radiation immunity testing

• System configuration image

  

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  The system consists of a signal generator serving as a signal source for noise, a power amplifier that amplifies the signal, a TEM horn antenna that emits radio waves, a power meter to check the power supplied to the TEM horn antenna and a software to control these devices.
  The basic system configuration is almost the same with the IEC 61000-4-3 radiated immunity test. System setup for the proximity irradiation test can be achieved by simply switching the antennas from the broadband antenna to the TEM horn antenna.
  *antenna position control (X-Y control) is available as an option

  

• Test image using dedicated software (X-Y position movement and polarization switching control)

  

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  In the test, the distance between the DUT and the antenna is set to 100 mm, and all surfaces of the DUT are radiated with vertically polarized waves and horizontally polarized waves. By using the dedicated software to automate the antenna movement and radio wave radiation, you can further reduce test time and labor.

  

• The need for the close proximity radiation immunity testing

  

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  With the advent of new communication technologies and infrastructures such as IoT and 5G, in addition to smartphones and wireless LANs, which have become extremely popular in recent years, a world is emerging in which many electronic devices are connected by wireless communication. On the other hand, from the perspective of EMC, the number of cases where these wireless transmitters are in close proximity to other electronic devices is increasing, raising concerns about the risk of electromagnetic interference. Against this background, IEC 61000-4-39, an electromagnetic immunity test method for nearby transmitters, was issued. Since the electromagnetic field generated by a nearby transmitter is extremely strong and has the characteristics of the near field, it is necessary to perform it in addition to the conventional radiated immunity test that radiates from a distance. The basic standard IEC 61000-4-39 defines the antenna to be used, and it is necessary to use a TEM horn antenna in the frequency band of smartphones, mobile phones, and 5G (sub6).