Millimeetrilaine

Millimeetrilaine refers to electromagnetic waves with wavelengths ranging from approximately one to ten millimeters. This frequency band falls between microwaves and infrared radiation, typically corresponding to frequencies between 30 and 300 gigahertz. These waves are often generated by specialized electronic devices like Gunn diodes or IMPATT diodes, and can also be produced by certain types of lasers. Millimeter waves exhibit unique propagation characteristics; they are absorbed more readily by atmospheric gases such as water vapor and oxygen than lower frequency microwaves, leading to shorter effective ranges in open air. However, they can penetrate many non-conductive materials like plastics, wood, and clothing, which makes them useful for certain applications. The relatively short wavelengths of millimeter waves allow for the design of compact antennas and high-resolution imaging systems. Applications of millimeter waves include radar systems for automotive and security screening, high-speed wireless communication (often referred to as millimeter wave wireless or mmWave), and spectroscopy in scientific research due to their interaction with molecular vibrations. They are also employed in medical imaging and sensing technologies.