For example: Agilent E4440A or Anritsu 68369
Keithley Instruments Signal Generators
RF and microwave signal generators, PXI and PCI signal generators include versatile arbitrary waveform generators, function generators, and RF vector signal generators.
Keithley Instruments 2900-ARB-80
Arbitrary waveform generator, 80 MHz BW

Manufacturer: Keithley Instruments
Keithley Instruments 2910
400MHz - 2.5GHz Signal Generator Vector

Manufacturer: Keithley Instruments
Keithley Instruments 2910-ARB-ALG-GSM-WCDMA
Signal Generator Vector 2.5GHz

Manufacturer: Keithley Instruments
Keithley Instruments 2910-ARB-BT
Signal Generator Vector 2.5GHz (64Msa)

Manufacturer: Keithley Instruments
Keithley Instruments 2910-ARB-DIG-LPN
Signal Generator Vector 2.5GHz

Manufacturer: Keithley Instruments
Keithley Instruments 2910-ARB-F-DIG-LPN
400MHz - 2.5GHz Signal Generator Vector

Manufacturer: Keithley Instruments
Keithley Instruments 2910-ARB-LPN
Signal Generator Vector 2.5GHz (64Msa)

Manufacturer: Keithley Instruments
Keithley Instruments 2910-F-ARB-DIG-LPN
Signal Generator Vector 2.5GHz

Manufacturer: Keithley Instruments
Keithley Instruments 2910-F-DIG
400MHz - 2.5GHz Signal Generator Vector

Manufacturer: Keithley Instruments
Keithley Instruments 2910-F-DIG-LPN
400MHz - 2.5GHz Signal Generator Vector

Manufacturer: Keithley Instruments
Keithley Instruments 2920-80211-PC
Signal Meister Lic., 802.11a,b.g,j WLAN

Manufacturer: Keithley Instruments
Keithley Instruments 2920-FP-BT-006
10MHz - 6GHz RF Vector Signal Generator

Manufacturer: Keithley Instruments
Keithley Instruments 2920-FP-BT-006-ARB-40-102-107-108-80211
10MHz - 6GHz RF Vector Signal Generator

Manufacturer: Keithley Instruments