频率范围:
Higher Frequencies 200-1000 MHz (61 material)
Broadband Frequencies 25-300 MHz (Economical 46 material)
Broadband Frequencies 25-300 MHz (43 material)
Lower & Broadband Frequencies 1-300 MHz (31 material)
Low Frequency 200 kHz - 30 MHz (75 material)
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