Planar transmission line

Planar transmission lines are transmission lines with conductors, or in some cases dielectric strips. They are used to interconnect components on printed circuits and integrated circuits working at microwave frequencies. The principal advantage of the planar types is that they can be manufactured using the same processes used to make printed circuits.

About Planar transmission line in brief

Planar transmission lines are transmission lines with conductors, or in some cases dielectric strips, that are flat, ribbon-shaped lines. They are used to interconnect components on printed circuits and integrated circuits working at microwave frequencies. The principal advantage of the planar types is that they can be manufactured using the same processes used to make printed circuits. The earliest type of planar transmission line was conceived during World War II by Robert M. Barrett. It is one of the four main types in modern use, along with microstrip, suspended stripline, and coplanar waveguide. These types cannot support the same mode as a pair of wires, and consequently they have different transmission properties. Many of these types have a narrower bandwidth and in general produce more signal distortion than pairs of conductors. Their advantages depend on the exact types being compared, but can include low loss and a better range of characteristic impedance. Some authors make a distinction between transmission line and waveguide, and this article includes both kinds, so long as they are in a planar form. The term waveguide when used unadorned, means the hollow, or dielectrics filled, metal kind of waveguide,. which is not aPlanar form and can also be constructed in non-planar formats such as wires or coaxial lines. As well as interconnections, there are a wide range of circuits that can be implemented in planar formats. These include filters, power dividers, choke circuits to deliver biasing active components, matching power couplers, matching impedance matching and choke circuits.

Making transmission lines out of longer wavelength elements is particularly well suited to mass production of such components of such as photolithography. At microwave frequencies the distance at which transmission line theory becomes necessary is measured in millimetres. A pattern of transmission lines can be used for the same function as these components. Whole circuits, called distributed-element circuits, can be built this way. The method is often used for filters, often used to build this way, and it is also used for radio communication networks, such as in the UK and the U.S. This method is particularly appealing for use with printed andIntegrated circuits because these structures can be. manufactured with the same process as the rest of the assembly simply by applying patterns to the existing substrate. This gives planar technologies a big economic advantage over other types of line such as coaxial line, which are not planar at all. It can be also be used to construct printed circuits as well as integrated circuits, and can be applied to printed and printed circuits in a variety of ways, including by adding patterns to existing substrate with rows of posts. The process is known as ‘planar assembly’ and is used to create printed circuits, printed circuits or integrated circuits in the semiconductor industry. It’s also used in the aerospace industry to make integrated circuits and other high-tech equipment. It has been used in military applications such as the US Air Force and the US Department of Defense.

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