Various components (DC to 40 GHz)

DC blocks
DC blocks are essentially coaxial components for separating modulated signals from direct current signals at the transmission path of a RF cable (DC blocking). DC blocks are available in three different versions:
Inner DC block:
With the "inner DC block" only the inner conductor of a coaxial cable is separated with a capacitor.
Outer DC block:
With the "outer DC block" only the outer conductor of a coaxial cable is separated with a capacitor.
Inner/outer DC block
With the "inner/outer DC block" both (inside and outside conductors) are separated using capacitors.
The use of capacitors with the DC block ensures that the direct current signals cannot be transmitted to the next system, whereby the capacitors in the DC block do not obstruct or attenuate the transmission of RF signals in the given frequency range. The specified working voltage indicates the DC voltage up to which the DC block will guarantee isolation. If this voltage is exceeded, DC voltage disruptions/short circuits can have fatal consequences for the connected RF systems.

Bias tees
Bias tees are passive components that enable DC signals to be separated from or joint with RF signals. In the broadest possible sense they are diplexers. Bias tees are used, for example, to supply amplifiers. In these cases, both a RF signal and a direct current supply voltage are transmitted together via a coaxial cable. The bias tee is inserted shortly before the amplifier. The bias tee passes the high frequency signal on to the amplifier input, while the supply voltage supplies the amplifier with the required operating voltage. Bias tees are available for different frequency ranges and voltage ranges. As bias tees separate the coaxial cable, parameters such as insertion loss and RF adjustment (VSWR) are important criteria for choosing a bias tee.

Impedance matching pads
Coaxial cables can generally be delivered with different impedances (wave resistances). Cables with a defined impedance of 50 Ω are mostly used in high frequency and microwave technology. For low frequency systems (generally far below 4 GHz), coaxial cables with different impedances are used, such as 93 Ω or even 75 Ω, for example. Impedance matching pads are used, where required, to connect systems with different impedances with one another. The passive component is essentially a transformer. Impedance matching pads are designed for different RF powers and are used between two coaxial cables with different wave resistances for impedance matching.