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TEM Horn Antenna

TEM Horn Antenna THA-380M60G

EMC Testing in the 5G/IoT Era!

The TEM horn antenna is an antenna for conducting a close proximity radiation immunity evaluation test (near electromagnetic field immunity test) of electromagnetic waves radiated from various wireless transmitters such as mobile phones.
In the future, the close proximity radiation immunity evaluation test using the TEM horn antenna is expected to expand to various product standards such as medical equipment (IEC 60601-1-2) and multimedia equipment (CISPR 35).
NoiseKen's TEM horn antenna has a wide band, low VSWR, and wide electric field uniformity offers an ideal solution for an efficient close proximity radiation immunity test.


  • A TEM horn antenna compliant with IEC 61000-4-39 Ed.1.
  • Test without changing the antenna in the frequency range of 380MHz to 6GHz.
  • 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.
  • Since the maximum point of the near electric field distribution for each frequency is at the center, enables radiation on the EUT based on the axis of the antenna. Hence, significantly simplifies test point alignment.



  Item  Specification
 Compliant standard  Compliant standard IEC 61000-4-39
 Frequency range  380MHz 〜 6GHz
 VSWR  3 and below *Refer to figure (VSWR)
 Undetermined power  380MHz 〜 750MHz:180W MAX
 750MHz 〜 1.7GHz:100W MAX
 1.7GHz 〜 6GHz:65W MAX
 Electric field uniform area  See figure (electric field distribution characteristics)
 Gain  Refer to the figure {Power required to generate 300V/m (typ) (at 0.1m)}
 Impedance (typ)  50 Ω
 Connector  N (J)

 W450mm × H420 mm × D598 mm

 *Refer to diagram (measurement) for details.

 Weight  approx. 3.2kgs



  •  Measurement



  • VSWR



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


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



  • Electric field distribution characteristics 


Electric field distribution characteristics(Antenna distance: 0.1m 2dB / Line * The second contour line from the inside is the electric field uniform area.)The electric field distribution haracteristics are symmetrical vertically and horizontally.

About securing an uniform electric field 

In the actual test, the radiation position is controlled by creating a quadrangle inscribed on the uniform electric field surface. Therefore, there is a symmetric electric field distribution characteristic that has a maximum point in the center and can create a large quadrangle.


【When the uniform electric field is symmetrical】Since the electric field uniform surface is symmetrical vertically and horizontally, a wide electric field uniform surface can be obtained based on the antenna center axis. 【When there is distortion on the uniform electric field surface】If the electric field uniform surface is distorted, it is difficult to secure a wide electric field uniform surface with respect to the center axis of the antenna. (It becomes a narrow electric field uniform surface.)


System confi guration image 

The system confi guration is a signal generator that is a signal source of noise, a power amplifi er that amplifi es the signal, a TEM horn antenna that radiates radio waves, a power meter that confi rms the power supplied to the TEM horn antenna, and software to control these series of devices.
The basic system confi guration is almost the same as the IEC 61000-4-3 radiated immunity test, and in order to perform the proximity radiation test, the system can construct simply by changing the antenna from the conventional wideband antenna to the TEM horn antenna. (Antenna position control (X-Y control) is available as an option.)


 System confi guration image (Utilization of existing IEC 61000-4-3 radiated immunity test facility.More convenient with optional support.A system with dedicated software can build.)

Test image using dedicated software

   (X-Y position movement and polarization switching control)

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 dedicated software to automate antenna movement and radio wave radiation, you can further reduce test time and labor.


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


The need for proximity radiation testing


With the advent of new communication technologies and infrastructures such as IoT and 5G, in addition to smart phones 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, and there is concern 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 hat radiates from a distance. The basic standard, IEC 61000-4-39, defi nes the antenna to be used, and it is necessary to use a TEM horn antenna in the frequency band of smart phones, mobile phones, and 5G(sub6).


Strong electric field strength in the proximity (nearby) (Requirement for strong electric field strength test) Different exposure range (Evaluation of different impacts) Because the test conditions are different, the results are different.

  TEM Horn Anttena Catalog