outer conductor การใช้

• Refer to the diagram below showing the inner and outer conductors of a coaxial cable.
• The outer conductor is usually sheathed in a protective PVC outer jacket ( A ).
• In most cases, the inner and outer conductor terms are negligible, in which case one may approximate
• Therefore, the inner or the outer conductor needs a DC-block, that is, a capacitor.
• Coaxial railguns accelerate toroidal plasma armatures using a hollow outer conductor and a central, concentric, inner conductor.
• Coaxial structures with spring-loaded inner and outer conductors can serve as an RF probe for modern communication electronics.
• Also, additional quarter-wavelength sections may be connected to the outer conductor to form a better ground plane.
• There are three regions that may contain induced magnetic fields : the center conductor, the dielectric and the outer conductor.
• No energy flows outside the cable, either, since there the magnetic fields of inner and outer conductors cancel to zero.
• If the DC block is used in the outer conductor, it is in parallel with the larger capacitor in the power supply.
• In the simplest case, this is a ferrite bead, it includes the coaxial inner and outer conductor and acts as a choke.
• As well as providing additional shielding, the outer conductors can be used for other purposes such as providing power to equipment or control signals.
• The outer conductor is rippled like a bellows to permit flexibility and the inner conductor is held in position by a plastic spiral to approximate an air dielectric.
• The characteristic impedance of the cable ( Z _ 0 ) is determined by the dielectric constant of the inner insulator and the radii of the inner and outer conductors.
• Wartime production of coax, and for a period afterwards, tended to use standard plumbing pipe sizes for the outer conductor and standard AWG sizes for the inner conductor.
• For high-power radio-frequency transmission up to about 1 GHz, coaxial cable with a solid copper outer conductor is available in sizes of 0.25 inch upward.
• This last characteristic was achieved by having both the inner and outer conductors made from four leaves, two of which were displaced slightly outwards and two of which were displaced slightly inwards.
• In " C ", however, there is a reduced magnetic field in the deeper sections of the inner conductor and the outer sections of the shield ( outer conductor ).
• It has a wire conductor in the centre ( D ), a circumferential outer conductor ( B ), and an insulating medium called the dielectric ( C ) separating these two conductors.
• Since the current in the inner conductor is balanced by the opposite current flowing on the inside of the outer conductor, there is no remaining magnetic field in the outer conductor itself where b.