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 1000 has a maximum septum height of 1000 mm and is suitable for emissions and immunity testing.
GTEM（Gigahertz Transverse Electro Magnetic，吉赫橫向電磁）測試室是一種測試空間，能在單一、可控且具備屏蔽效果的環境中，有效率地執行輻射抗擾度與輻射發射測試。相較於其他測試場地，GTEM 測試速度更快，且具有高準確性與優異的重現性。
GTEM 測試室的基本原理是由一條金字塔狀擴展的同軸傳輸線構成，阻抗為 50 Ω。其末端使用終端電阻與射頻吸收材料組合而成，旨在實現良好的阻抗匹配。
GTEM 1000 的最大隔板（Septum）高度為 1000 mm，適用於執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
