which PIN diodes can work as switch under 1GHz frequency

There are several PIN diodes that can work as a switch under 1GHz frequency, including:

1. HSMP-381x series from Avago Technologies
2. MA4E1317 series from MACOM
3. BAP50-03 series from Infineon Technologies
4. NTE6118 series from NTE Electronics
5. MRF947T1 series from Motorola

It is important to note that the exact specifications, performance, and suitability of a PIN diode for a particular application will depend on several factors, including the specific frequency range, power requirements, and other design considerations. Therefore, it is recommended to consult the datasheets and application notes for each diode before selecting one for a particular application.