# RF and Microwave devices

Radiofrequency (RF) and microwave devices are classes of electronics circuit, designed to operate on signals in the megahertz to gigahertz frequency ranges. This frequency range is the range used by most broadcast radio, television, wireless communication (cell phones, Wi-Fi, etc.), and thus most *RF circuit cannot be analyzed using common methods like KCL and KVL to compute voltage and current in circuits. Rf and Microwave system usually **build in a special substrate with different properties. *

In analysis a Rf circuit, we should use Maxwell’s equations to solve a problem. **Maxwell’s equations** are a set of partial differential equations that, together with the Lorentz force law, form the foundation of classical electromagnetism, classical optics, and electric circuits.

## Rf and Microwave simulation

Rf and Microwave problem can be solved by numerical method. there is more software exist in the world to compute and simulation Radio frequency problem. In a numerical method like Moment, Maxwell’s equation should be solved for all boundary condition. Computer Simulation Technology (CST), HFSS, Advance Design System(ADS) and Comsol are software which can compute and simulated the electromagnetic problems.

## What is different between Rf and Microwave?

RF or Radio Frequency is a term that is often used to describe the number of times per second or oscillation of an electromagnet radiation. Anything between 3Hz and 300GHz is still referred to as RF waves, but they are subdivided depending on the actual frequency. A microwave is a general term used to describe RF waves that start from UHF (Ultra High Frequency) to EHF (Extremely High Frequency) which covers all frequencies between 300Mhz to 300GHz, lower frequencies are referred to as radio waves while higher frequencies are called millimeter waves.