A GTEM (Gigahertz Transverse Electro Magnetic) cell is a test site for efficiently performing both radiated immunity and emissions testing in a single, controllable and shielded environment. Compared to other test sites, GTEM testing is faster with high accuracy and excellent reproducibility. In principle, the GTEM cell is a coaxial line expanding pyramidally and having an impedance of 50 Ω. At its end, the line is terminated by a combination of termination resistors and RF absorbers designed and constructed to match the above mentioned impedance. The GTEM 250 has a maximum septum height of 250 mm and is suitable for emissions and immunity testing.
GTEM（Gigahertz Transverse Electro Magnetic，吉赫橫向電磁）測試室是一種測試場地，可在單一、可控制且具屏蔽效果的環境中，高效率地執行輻射抗擾度測試與輻射發射測試。與其他測試場地相比，GTEM 測試具有測試速度快、準確度高及可重複性佳等優點。
基本上，GTEM 測試室是一條同軸線，其結構以金字塔形擴展，並具備 50 Ω 的阻抗。其末端以匹配該阻抗的終端電阻與射頻吸收材料所組成，以達到良好的終端匹配效果。
GTEM 250 的最大隔板（septum）高度為 250 mm，適用於進行輻射發射與抗擾度測試。
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Emissions and immunity testing in a single, shielded environment
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Meets basic standard: IEC/EN 61000-4-20
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Meets standards for emissions testing: CISPR 14-1, IEC 61000-6-3 and IEC 61000-6-4 for EUTs without connected cables
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Ideal for design qualification and pre-certification
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Fields generated are largely homogeneous and simple to calculate
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Efficient power conversion requires smaller power amplifier
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Excellent VSWR over the entire frequency range - no need for measurement of reflected power
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在單一屏蔽環境中進行輻射與抗擾度測試
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符合基礎標準：IEC/EN 61000-4-20
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符合輻射測試標準：CISPR 14-1、IEC 61000-6-3 及 IEC 61000-6-4（適用於無外接電纜的受測設備）
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設計驗證與預符合性測試的理想選擇
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產生的電磁場大致均勻且易於計算
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高效的功率轉換，僅需較小的功率放大器即可運作
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整個頻率範圍內具有優異的電壓駐波比（VSWR）無須量測反射功率
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CISPR Standards : CISPR 14-1
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IEC / EN Basic Standards : IEC 61000-4-20
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IEC / EN Generic Standards : EN 61000-6-3 EN 61000-6-4
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Automotive Standards : ISO 11452-3 SAE J1113-24
