Microwave is a Radio Wave

In physics, the wavelength of a sinusoidal wave is the spatial period of the wave, or the distance over which the shape of the wave repeats. Ultra-High Frequency (UHF), also known as the decimetre band/wave (wavelengths range from one to ten decimetres or 10 cm to 1 metre), the ITU Radio frequency range of electromagnetic waves between 300 MHz and 3 GHz (3,000 MHz), and Extremely High Frequency (EHF), also known as terahertz radiation or millimeter waves/band (MMW/mmW), the highest radio frequency band which runs the range of frequencies from 30 top 300 gigahertz, above which electromagnetic radiation is considered to be low (or far) infrared light, and various sources using different boundaries are all included in the definition stated above.Microwaves includes the entire Super High Frequency (SHF) band (3 to 30 GHz, or 10 to 1 cm) at minimum in all cases, with RF engineering, a subset of electrical engineering that deals with devices designed to control the Radio Frequency spectrum which often puts the lower boundary at 1 GHz (30 cm), and the upper around 100 GHz (3 mm).  Apparatus and techniques can be described qualitatively as “microwave” when the signals’ wavelengths are somewhat the same as the dimensions of the equipment, so that lumped-element circuit theory is inaccurate. The lumped-element circuit theory, also referred as lumped parameter model or lumped component model, is a theory summarizing the description of the behaviour of spatially distributed physical systems into a topology comprising of discrete entities that approximate the behaviour of the distributed system under particular assumptions, is inaccurate.Practical microwave technique tends to get away from the following as a consequence: the discrete resistors, a passive two-terminal electrical component implementing electrical resistance as a circuit element; capacitors, formerly known as condenser, a passive two-terminal electrical component used to store energy in an electric field; and inductors (choke, coil or reactor), a passive two-terminal electrical component storing energy in its magnetic field, using lower-frequency radio waves.Alternatively, distributed circuit elements, also referred as distributed element model or transmission line model  of electrical circuits, in electrical engineering, assumes that the attributes of the circuit--resistance, capacitance, and inductance--are allocated constantly throughout the material of the circuit, and transmission-line theory are more useful methods for design and analysis  instead. Open-wire and coaxial transmission lines, a specialized cable for carrying alternating current of radio frequency, give way to wave guides and stripline, a transverse electromagnetic (TEM) transmission line medium, invented by Robert M. Barrett of the Air Force Cambridge Research Centre in the 1950s, that is, currents with a frequency high enough that their wave nature must be taken into account. Lumped-element tuned circuits are replaced by cavity resonators, a device or system that exhibits resonance or resonant behavior, that is, it naturally oscillates at some frequencies, called resonant frequencies, with greater amplitude than at others, or resonant lines.