Antenna Definitions
"A", "B", "C", "D", "E", "F", "G"/"H", "I" to "L", "M" to "O",
"P"/"Q", "R", "S", "T", "U" to "Z"

C to Cn, Co to Cz

Coaxial Antenna: A half-wave dipole antenna formed using a Coaxial Cable.

Coaxial Cable: A transmission line consisting of two conductors, one inside the other, and separated by insulating material. The inner conductor may be a small copper tube or wire; the outer conductor may be metallic tubing or braid. Detailed Coax Cable definition and graphic. Radiation loss from this type of line is less then other types of cable. [Coax Cable Manufacturers]

Collimation. The process by which a divergent or convergent beam of electromagnetic radiation is converted into a beam with the minimum divergence or convergence possible for that system (ideally, a bundle of parallel rays).

Collinear Antenna Array: An array of dipole antennas mounted in such a manner that every element of each antenna is in an extension, with respect to its long axis, of its counterparts in the other antennas in the array.

Communications circuit: The means by which information is transferred between two or more places.

Conductor: A material (usually metal) that has low resistance to the flow of electrical current. A wire, cable, or other object capable of carrying electric current. Good conductors are made of metals such as silver, copper, and aluminum.

Conical Monopole Antenna: A vertically polarized omnidirectional antenna used for broadband communications. A graphic resides on the monopole antenna page.

Connections: Points at which two or more conductors are brought into contact. Also see a list of Connector Manufacturers [by type].

Corner-Reflector Antenna. A half-wave antenna with a reflector consisting of two flat metal surfaces meeting at an angle behind the radiator. A directional antenna using two mutually intersecting conducting flat surfaces.

Corner Reflecting Antenna

Counterpoise: A conductor or system of conductors used as a substitute for ground in an antenna system; a wire or group of wires mounted close to the ground, but insulated from ground, to form a low-impedance, high-capacitance path to ground.

Coupling. The desirable or undesirable transfer of energy from one medium, such as a metallic wire or an optical fiber, to another like medium. The diagram shows an equivalent circuit of an antenna coupler using resistors, capacitors and inductors.

Equivalent circuit of an antenna coupler
Equivalent Circuit

Coupling Loss. The loss that occurs when energy is transferred from one circuit, circuit element, or medium to another.

Critical frequency: The highest frequency at which a signal may be transmitted directly overhead and be reflected back to Earth from the ionosphere.

Cross-polarized: The polarization of a received signal is 90 degrees to the polarization of the receiving antenna.

Cross Modulation. A type of intermodulation of a desired carrier by undesired carriers.

Curtain Antenna: An antenna with elements that hang like a curtain [see the graphic to the right].

PC motherboard

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