Chip Antennas - The Miniture Antenna That Give Mobile Devices The Appearance Of Being Antennaless

Generally the dielectric chip antenna has a shape is cuboid or a similar form of hexahedron

, although other shapes are possible. A surface mounted chip antenna is generally characterised by having at least two conductive electrodes and often three; a feed electrode, a ground electrode and a radiation section. Sometimes monopole designs are used in which case there is no ground electrode; in this case additional solder pads, having no electrical functionality, may be used to add mechanical stability to the surface mounting process.

Chip antennas are generally known as antennas which are used in mobile phones and have taken favour over stubby antennas which were formerly used on mobile phones. A chip antenna is a common semiconductor component in a cell phone. A cell phone antenna can be embedded in the body of the phone itself or be partially external,

The chip antenna is miniaturized compared with a whip antenna, which was commonly used for mobile communications. Accordingly, this chip antenna is surface-mountable. The bandwidth of the chip antenna, on the other hand, is comparatively narrow. In the manufacturing process, therefore, a deviation of the resonant frequency from a predetermined value seriously reduces the gain of the chip antenna, thereby lowering the yield of the chip antenna.

The chip antenna gradually became an indispensable element used in a communication product because of its small size and being directly and easily installed in the electronic devices. But the conventional chip antenna still has some drawbacks, such as a slightly large size, insufficient efficiency, and high manufacturing cost.

Generally, surface mounted chip antennas are used as antennas for small-sized communication devices, and have been recently popularized as global positioning system (GPS) antennas within mobile communication terminals. Chip antennas are also used as components in a satellite radio antenna. Satellite radio is a digital radio system that functions wherever there is line of sight between the radio antenna and the communications satellite. Chip antennas are also used in radio frequency identification applications, similar to the function that a barcode serves for inventory control or data collection.

Chip antennas have the advantage of small volume; however, small volume also limits the length of the micro strips, so that the radiation areas of chip antennas are obviously smaller than those of conventional antennas. Therefore bandwidth of chip antennas is limited. To overcome the shortcoming, some scholars and manufacturers have made some suggestions, for example, changing surrounding modes of micro strips, to ensure that more loops of micro strips can be disposed on chip antennas. Another example, to extend one portion of a micro strip out of the antenna can increase the total length of the micro strip and the bandwidth of the antenna.

by: Chris Cowper

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