Skyworks AS179 Switch
The AS179-92LF is an IC FET SPDT switch in a low cost miniature SC-70 6-lead plastic package. The AS179-92 features low insertion loss and positive voltage operation with very low DC power consumption. This general purpose switch can be used in a variety of telecommunications applications.   Datasheet

Amplifiers
Amplifiers are used in various functions within a radio subsystem. Used as Low noise amplifiers (LNA's), IF gain stages, or Power Amplifiers (PA's), the purpose of the Amplifier in an RF subsystem remains to increase the link budget and increase the transmission range of a device. Amplifiers can be made from Silicon, but for low noise introduction, high-amplification operation other processes are commonly used, such as HEMT and GaAs.

RF Connectors and Cable Assemblies
RF Connectors and cable assemblies are designed to provide a low-loss/low-noise connection at high frequencies up to 11 GHz.

Amphenol Connex
ACX1199-ND RP-SMA Free-Hanging Plug
View All Amphenol Connex RF Connectors / RF Cable Assy.

Modulators and demodulators are used to change (Modulate) a waveform so that it may carry a signal to the receiving device to be demodulated, whether the signal is voice or data, various techniques are available such as analog modulation (AM, FM) and Digital Modulation (FSK, ASK, PSK etc).

PLLs and Synthesizers
PLLs and Synthesizers are used to generate a frequency from a fixed oscillator frequency or other fixed source.

Analog Devices (pictured)
ADF4153BRUZ-ND PLL Synthesizer. RF Fractional N frequency up to 4GHZ   Datasheet

Filters
RF Filters are components utilized to "filter" a frequency. Filter types available include Band pass (i.e. allow a Frequency band to pass through the filter), Low pass (i.e. allow Frequency below a level to pass), and High pass (i.e. allow a frequency above a level to pass through), in certain technologies such as Ceramic and SAW (Surface acoustic Wave).

Mixers
RF Mixers are designed to mix two or more input frequencies and provide either a summed output or a difference output. The original input frequencies may also be output but are typically filtered out in later stages of the application.

Switches
A switch in RF is used to provide a way to provide a single transmission path in an application where multiple transmission paths are needed. An example would be creating a transceiver out of a receiving device and a transmitting device, creating a single path to the antenna while being able to switch between the receive and transmit paths. Other applications can also include using a single antenna for multiple frequencies or allowing two devices operating at the same frequency to "share" the antenna.