Tekbox open TEM cells got a better frequency response compared to standard TEM cells of similar size. TEM cells suffer from higher order wave modes which limit the usable bandwidth. A unique design feature of the Tekbox TEM cells implements resistance perpendicular to the desired propagation direction of the wave. Consequently higher order wave modes and resonances are suppressed.
All TEM cells are supplied together with a 50Ω/25W RF termination, a DC block to protect the spectrum analyzer or RF receiver input and a N-Male to N-Male coaxial cable.

• TBTC0 TEM cell dimensions:

Length: 390 mm
Width: 100 mm
Height: 62 mm
Septum height: 28 mm

Rectangular area under the septum: 19 cm x 7 cm x 2,8 cm

TEM cell connectors: N-female
Nominal cell impedance: 50 Ohm
Wave impedance: 377 Ohm
Maximum RF input power: 10W (limited by supplied 50 Ohm Termination)
Input return loss: S11 up to 3.15 GHz < -15dB
Transmission loss: up to 3 GHz < 3dB, up to 6 GHz < 4dB

• TBTC1 TEM cell dimensions:

Length: 390 mm
Width: 200 mm
Height: 108 mm
Septum height: 50 mm

Rectangular area under the septum: 19 cm x 13 cm x 5 cm

TEM cell connectors: N-female
Nominal cell impedance: 50 Ohm
Wave impedance: 377 Ohm
Maximum RF input power: 25W (limited by supplied 50 Ohm Termination)
Input return loss: S11 up to 1.2 GHz < -20dB, up to 2.1 GHz < -17dB, up to 3GHz < -14dB
Transmission loss: up to 1.4 GHz < 1 dB, up to 2.1 GHz < 3dB, up to 3 GHz < 6dB

• TBTC2 TEM cell dimensions:

Length: 636 mm
Width: 300 mm
Height: 205 mm
Septum height: 100 mm

Rectangular area under the septum: 23 cm x 28 cm x 10 cm

TEM cell connectors: N-female
Nominal cell impedance: 50 Ohm
Wave impedance: 377 Ohm
Maximum RF input power: 25W (limited by supplied 50 Ohm Termination)
Input return loss: S11 up to 800 MHz < -15dB, up to 1.5 GHz < -10dB, up to 3GHz < -8dB
Transmission loss: up to 800 MHz < 1 dB, up to 1.15 GHz < 3dB

• TBTC3 TEM cell dimensions:

Length: 1038 mm
Width: 501 mm
Height: 305 mm
Septum height: 150 mm

Rectangular area under the septum: 36 cm x 48 cm x 15 cm

TEM cell connectors: N-female
Nominal cell impedance: 50 Ohm
Wave impedance: 377 Ohm
Maximum RF input power: 25W (limited by supplied 50 Ohm Termination)
Input return loss: S11 up to 700 MHz < -16dB
Transmission loss: up to 730 MHz < 3 dB

DC-Block 50V-6GHz-N
Connectors: N-Male/Female
Nominal impedance: 50 Ohm
Max. continuous RF power: 2W
Max. continuous RF voltage: 50V RMS
Frequency: 500kHz to 6 GHz
VSWR: ≤ 1.2

RF-Termination 50Ω-3GHz-25W-N
Connector: N-Male
Nominal impedance: 50 Ohm
Max. continuous RF power: 25W
Frequency: DC to 3 GHz
VSWR: ≤ 1.2
Third order intermodulation: ≤ 120 dBc

DOCUMENTATION DOWNLOAD

TBTC manual

Q&A Open TEM Cells

Q&A Open TEM Cells German/Deutsch

EMC pre compliance testing guide

Application Note: Radiated Noise Measurement example using Tekbox TEM Cells

Application Note: Immunity testing example using Tekbox TEM Cells

Application note: How to correctly use spectrum analyzers for EMC pre-compliance tests

TBTC 1 insertion loss (S21)

TBTC 2 insertion loss (S21)

TBTC 3 insertion loss (S21)

EMCview PC software for EMC pre-compliance testing