Final answer:
Radio frequency shielding is used to limit electromagnetic wave interference to ensure the proper functioning of various equipments and prevent energy loss. It is essential in environments with sensitive devices and is governed by regulations assigning specific radio frequency bands to different users.
Step-by-step explanation:
Radio frequency shielding is installed to limit electromagnetic wave interference, which can affect a wide range of equipment and systems, from astrophysical instruments to medical devices. This form of shielding helps to minimize radiation 'pollution' from various communication devices, which pervade our environment and can impact sensitive equipment. For example, electromagnetic waves, even those at the low range emitted by high-voltage AC power transmission lines at frequencies of 50 or 60 Hz, can result in energy loss during long-distance power transfer.
Since different devices, such as mobile phones, remote controls for cars and televisions, operate using radio-wave frequencies, strict regulations are in place to allow different organizations to operate within specific radio frequency bands to avoid crossover and maintain the reliability of critical communication and medical equipment. For instance, in environments like hospitals and airplanes, mobile phones may be required to be switched off or placed in a noncommunicative mode to prevent interference with essential equipment that may operate on similar frequencies.
Shielding also prevents the unintended radiation of energy from circuits, an important consideration in circuit design where energy loss through radiation is generally expected to be minimal. It is critically important in protecting against unwanted radiation, such as that from a broadcast antenna or microwave oven, where the energy is intentionally radiated but needs to be controlled.