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大氣電波.
大氣電波,學術上叫無線電頻譜或者無線電波譜,係指3Hz到300GHz嘅無線電電磁波(即係無線射頻)嘅波譜,屬電磁波譜嘅一部份,用途好廣,無論電視機、收音機、手提電話、對講機、無線網絡、雷達都會用到唔同頻率嘅大氣電波。
根據國際電訊聯盟嘅分法,大氣電波可以細分做12個波段,當中第4到12段廣泛用喺電訊用途。
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ELF 3 Hz/100 Mm 30 Hz/10 Mm
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SLF 30 Hz/10 Mm 300 Hz/1 Mm
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ULF 300 Hz/1 Mm 3 kHz/100 km
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VLF 3 kHz/100 km 30 kHz/10 km
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LF 30 kHz/10 km 300 kHz/1 km
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MF 300 kHz/1 km 3 MHz/100 m
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HF 3 MHz/100 m 30 MHz/10 m
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VHF 30 MHz/10 m 300 MHz/1 m
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UHF 300 MHz/1 m 3 GHz/100 mm
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SHF 3 GHz/100 mm 30 GHz/10 mm
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EHF 30 GHz/10 mm 300 GHz/1 mm
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THF 300 GHz/1 mm 3 THz/0.1 mm
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