Microwave frequencies had such high

Microwave frequencies had such high attenuation that future FOPEN system development
was mainly concentrated at the UHF band and below.

Hasil (Bahasa Indonesia) 1:

Frekuensi microwave telah redaman tinggi seperti bahwa masa depan pengembangan sistem FOPENyang terutama terkonsentrasi di UHF band dan di bawah.

Hasil (Bahasa Indonesia) 2:

Frekuensi gelombang mikro memiliki atenuasi tinggi sehingga pengembangan sistem fopen masa depan
terutama terkonsentrasi di band UHF dan bawah.