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Antenna for wireless communication equipment
| Details |
Inventors: Hikuma, Hideo;
Assignee: Uniden Corporation (Ichikawa, JP)
Primary Examiner: Sikes; William L.
Assistant Examiner: Johnson; Doris J.
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier
An antenna has a main vertical planar part which is connected at its one end to the ground, and a main horizontal planar part which are both arranged in an L-shape. It has a secondary vertical linear part which is arranged in parallel with the main vertical planar part and connected at its one end to the feeding point. It also has a conductive secondary horizontal linear part which is connected between the main horizontal planar part and the secondary vertical linear part and is arranged in parallel with the main horizontal planar part, while being separated from the main horizontal planar part by a definite distance. This makes it possible to incorporate the antenna in the circuit board of wireless communication equipment, and the antenna is particularly suitable for miniaturizing the equipment. |
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DETAILED DESCRIPTION The object of this invention is to provide a highly suitable new antenna configuration which has a good efficiency, in which miniaturization is possible, and in which impedance matching can be done easily even if the dimensions of the main antenna parts and the lead-out position of the feeding point are restricted, that is, in which there is a high degree of freedom in adjusting the antenna impedance.
To attain the above object, the antennas of this invention for wireless communication equipment consist of a main vertical planar part which stands erect and one end of which is connected to the ground; a main horizontal planar part which extends at right angles towards the aforesaid main vertical planar part and one end of which is connected to the other end of the main vertical planar part; a secondary vertical linear part which faces towards and extends in parallel to the aforesaid main vertical planar part, and one end of which is connected to the feeding point; and a secondary horizontal linear part which extends in parallel to the aforesaid main horizontal planar part, separated from it by a definite distance, and one end of which is connected to the other end of the aforesaid secondary vertical linear part.
In the configuration of this invention, when configuring the prescribed dimensions in terms of the height (or length) of the main vertical planar part and the length of the main horizontal planar part -- generally a length corresponding to .
lambda.
/4 with respect to the wavelength .
lambda.
of the frequency used --, it is possible to attain sufficient matching of the impedance with the feeder line since there is an extremely high degree of freedom in adjusting the impedance.
This is true even in cases where matching of the impedance with the feeder line would be difficult without modifications.
This is possible, firstly, because the height of the main vertical planar part has been reduced as necessary on account of requirements such as miniaturization of the wireless communication equipment on which the antenna is to be mounted, and, secondly, because the width of the main horizontal planar part could not be increased very much on account of restrictions based on the same reason
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