Surface mounted antenna, its making process and radio communicator with the antenna

Abstract

A surface mount antenna easily manufactured includes a substrate and a radiation electrode (having a predetermined resonance frequency) disposed on the substrate. An electrode is formed to cover four continuously connected surfaces including the front surface, the front end surface, the rear surface and the rear end surface of each substrate. Then, a dicer is used to cut a slit on the radiation electrode formed on the surface of the dielectric substrate. Here, the slit is arranged in a direction intersecting a direction alpha connecting the two end surfaces. Subsequently, the dielectric substrate is cut into a plurality of portions along the direction alpha, thus producing a plurality of surface mount antennas each including a substantially rectangular substrate and a radiation electrode formed essentially surrounding an outer circumference of the substrate. In this way, it is possible to produce a plurality of surface mount antennas in only one operation. Since each radiation electrode has a very simple shape, and since a dicer can be used to perform a high precision processing, it is easy to form each radiation electrode having a desired resonance frequency, by using a dicer to perform a cutting treatment to process the slit.

Description

technical field [0001] The present invention relates to a surface mount type antenna which can be mounted on a printed circuit board of a radio communication device, its manufacturing method, and a radio communication device having the antenna. Background technique [0002] An antenna that can be surface mounted on a printed circuit board of a radio communication device (surface mount antenna), for example, has a sheet-shaped substrate (such as a dielectric substrate) and a radiation electrode formed on the substrate and capable of receiving and transmitting signals (radio waves). And constitute. Such a surface-mount antenna can be manufactured by, for example, a manufacturing method in which electrodes are formed on a sheet-like base by electroplating, and the electrodes are etched and processed into a predetermined shape to form radiation electrodes. Alternatively, a surface-mount antenna can also be produced by printing a thick-film electrode paste on the surface of the ...

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Problems solved by technology

[0003] However, the substrate of the surface mount antenna is very small, and conventionally, radiation electrodes have been independently formed one by one on such a small substrate, so there are problems of poor work efficiency and high manufacturing cost of the surface mount antenna.

[0004] In addition, there are subtle differences in the dielectric constant and size of the dielectric matrix, which sometimes cause errors in the resonance frequency of the radiation electrode

In order to suppress such an error in the resonant frequency of the radiation electrode, it is ne

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