CN101499554A

CN101499554A - Small size antenna

Info

Publication number: CN101499554A
Application number: CNA2008100049722A
Authority: CN
Inventors: 蔡调兴; 邱建评; 翁丰仁
Original assignee: Quanta Computer Inc
Current assignee: Quanta Computer Inc
Priority date: 2008-01-31
Filing date: 2008-01-31
Publication date: 2009-08-05

Abstract

The invention relates to a small antenna, which is arranged on a circuit board. The circuit board is provided with a through hole; the small antenna comprises a radiation line segment and a screw column; the radiation line segment is formed on the circuit board; one end of the radiation line segment is provided with a signal feed part and a grounding part, which are arranged at intervals and electrically connected with the circuit board respectively; the other end of the radiation line segment extends into the through hole; and the screw column penetrates the through hole and is electrically connected with the other end of the radiation line segment. The invention combines the radiation line segment formed on the circuit board and the screw column used for locking the circuit board to constitute the radiation structure of the small antenna; and the capacity effect generated by the screw column is adopted to shorten the radiation path required by the whole small antenna, thereby saving the space for the antenna. In addition, as screw column serves as part of the antenna, the manufacturing cost can be saved.

Description

Small size antenna

Technical field

The invention relates to a kind of small size antenna, be meant a kind of small size antenna that is applied to compact electronic devices such as mobile phone especially.

Background technology

At Portable communication products microminiaturization day by day, for Antenna Design, utilizable space is also few, so must fill the limited mechanism space that utilizes of part, traditional antenna pattern commonly used has: flexible pattern (FPC, Flexible Printed Circuit), shell fragment pattern (Spring-Type) and wafer pattern (Chip-Type).

Flexible pattern and wafer pattern all belong to the pattern of two dimensional surface, need enough spaces just can reach the efficient of antenna itself in the use, and the design of two dimensional surface, and current path all has only the directivity on a plane usually; In addition, the antenna of flexible pattern and wafer pattern also is being high in price always, and this is a white elephant for the design of wireless communication apparatus at present.Though shell fragment pattern more aforementioned two kinds of patterns on price are more cheap, also can utilize multiple bending to reach the pattern of 3 D stereo, its needed spatial altitude makes designer's headache equally.

Summary of the invention

Therefore, purpose of the present invention is promptly providing a kind of small size antenna that can effectively reduce cost, save the space.

So small size antenna of the present invention is provided in a side of on the circuit board, circuit board is provided with a perforation, and small size antenna comprises a radiation line segment and a screw column.

The radiation line segment is to be formed at circuit board, a signal feed-in part and a grounding parts that the one end is provided with separately and electrically connects with this circuit board respectively, and its other end extends to perforation.

Screw column is to be arranged in perforation, and is electrically connected with the radiation line segment other end.

Description of drawings

Figure 1 shows that the front view of the structure of circuit board;

Figure 2 shows that the radiation line segment is arranged on the front view of circuit board;

Figure 3 shows that the profile along Fig. 2 III-III of the structure of small size antenna according to a preferred embodiment of the invention;

Figure 4 shows that the measurement result figure of the voltage standing wave ratio (VSWR) of small size antenna according to a preferred embodiment of the invention;

Figure 5 shows that radiation pattern (Radiation Pattern) figure of small size antenna when frequency is 2402MH according to a preferred embodiment of the invention;

Figure 6 shows that radiation pattern (Radiation Pattern) figure of small size antenna when frequency is 2440MHz according to a preferred embodiment of the invention; And

Figure 7 shows that radiation pattern (Radiation Pattern) figure of small size antenna when frequency is 2480MHz according to a preferred embodiment of the invention.

The main element symbol description

1 small size antenna

2 circuit boards

20 corners

21 perforation

22 earth points

23 signaling points

24 square frames

3 radiation line segments

31 first radiant sections

32 second radiant sections

33 the 3rd radiant sections

34 grounding parts

35 signal feed-in part

4 screw columns

41 spiral shell heads

42 double-screw bolts

421 large aperture portions

422 small-bore portions

Embodiment

About aforementioned and other technology contents, characteristics and effect of the present invention, in a following cooperation DETAILED DESCRIPTION OF THE PREFERRED with reference to the accompanying drawings, can clearly present.

Consult Fig. 1 and Fig. 2, the preferred embodiment of small size antenna 1 of the present invention is to be applied to compact electronic devices such as mobile phone, PDA, and be located on the circuit board 2 (pcb board) of this compact electronic device, Fig. 1 is the front view of circuit board 2, square frame 24 places can be provided with a small screen, four corners are respectively equipped with a perforation 21 (in the present embodiment, perforation 21 is a screw hole) and use for a screw column 4 and wear screw lock, on the casing (figure does not show) that circuit board 2 is fixed on compact electronic device.The small size antenna 1 of present embodiment is located at 20 places, a corner of circuit board 2, and as shown in Figure 2, small size antenna 1 comprises a radiation line segment 3 and this screw column 4.

Radiation line segment 3 is to be formed on the circuit board 2, have one by perforation 21 outward extending first radiant sections 31, one end links to each other with first radiant section 31 and generally is one second vertical radiant section 32, and an end links to each other with second radiant section 32 and generally is one the 3rd vertical radiant section 33, first radiant section 31 and the 3rd radiant section 33 are positioned at the same side of second radiant section 32, the end of the 3rd radiant section 33 is provided with a grounding parts 34 that is electrically connected with the earth point 22 of radio circuit (figure do not show) on the circuit board 2, and contiguous this grounding parts 34 with the signal feed-in part 35 of load point 23 electric connections of radio circuit (figure does not show).

As shown in Figure 3, screw column 4 comprises that a circular spiral shell head 41 and is by the spiral shell head 41 downward double-screw bolts 42 that extend, double-screw bolt 42 comprise a cylindrical large aperture portion 421 that links to each other with spiral shell head 41 and one by large aperture portion 421 terminal extend downwards and the aperture less than the cylindrical small-bore portion 422 of large aperture portion 421, the outer peripheral face of small-bore portion 422 is formed with screw thread, is locked in the perforation 21 in order to wear.When small-bore portion 422 was arranged in the perforation 21, the bottom surface of large aperture portion 421 compressed an end of first radiant section 31 and forms electrical connection, and the radiofrequency signal that radio circuit is produced can be launched by radiation line segment 3 and screw column 4.

And can be adjusted to the frequency range that antenna will be operated by the length of adjusting radiation line segment 3 (first radiant section 31 or second radiant section 32 or the 3rd radiant sections 33), for example the working frequency range of present embodiment is 2402MHz～2480MHz.In addition, the radiation path contraction in length that the capacity effect that screw column 4 is produced (Capacitor Load) can allow radiation line segment 3 need shortens the length of entire antenna, saves the space; And, aspect current path, produced the direction on two planes by the solid design that screw column 4 also produces three-dimensional.And in price, because the screw column 4 of institute's combination itself is used for fixing circuit board 2, needn't radiant element be set additionally again or removes to design the pattern of screw column 4 especially, so can make full use of existing element, save cost.

In addition, because the perforation 21 of four edges of circuit board 2 all can be used to be provided with the screw column 4 of small size antenna 1, so present embodiment also provides the multi-selection and the diversity of aerial position design.

Fig. 4 is voltage standing wave ratio (VSWR) the measurement result figure of present embodiment, Fig. 5 is radiation pattern (Radiation Pattern) figure of present embodiment when 2402MHz, Fig. 6 is radiation pattern (Radiation Pattern) figure of present embodiment when 2440MHz, and Fig. 7 is radiation pattern (Radiation Pattern) figure of present embodiment when 2480MHz.It is measured that Fig. 4～Fig. 7 is the scope of working frequency range 2402MHz～2480MHz, yet range of application of the present invention also not only terminates in this frequency range, can reach desired frequency range by the length of adjusting radiation line segment 3, and can be used in the electronic installation that needs small size antenna.

In the present embodiment, the spiral shell head 41 of screw column 4 be circular, large aperture portion 421 for cylindrical, right shape is replaceable to be shape such as square, square column type; In addition, also can be designed to whole double-screw bolt 42 and pass perforation 21, make the bottom surface of spiral shell head 41 compress radiation line segment 3 and form electrical connection.

In sum, utilization of the present invention forms radiation line segment 3 and combines with the screw column 4 of locking circuit board 2 on circuit board 2, constitute the irradiation structure of small size antenna 1, and the capacity effect that is produced by screw column 4, whole small size antenna 1 required radiation path can be dwindled, and then saving antenna institute usage space, in addition, also conventional two-dimensional planar antenna design improvement is become the three-dimensional antenna structure, can effectively reduce cost, save the space, fill part and utilize existing resource, so can reach purpose of the present invention really.

The above person only is the preferred embodiments of the present invention, and when not limiting scope of the invention process with this, promptly the simple equivalent of doing according to description of the present invention generally changes and modifies, and all still belongs in the scope that the present invention contains.

Claims

1. a small size antenna is located on the circuit board, and this circuit board is provided with a perforation, and this small size antenna comprises:

One radiation line segment is formed at this circuit board, a signal feed-in part and a grounding parts that the one end is provided with separately and is electrically connected with this circuit board respectively, and its other end extends to this perforation; And

One screw column is arranged in this perforation, and is electrically connected with this radiation line segment other end.

2. small size antenna according to claim 1, wherein, this screw column comprises a spiral shell head and a double-screw bolt that is extended by this spiral shell head, this double-screw bolt is arranged in this perforation, and this spiral shell head butt should perforation peritreme and be electrically connected with this radiation line segment other end.

3. small size antenna according to claim 1, wherein, this screw column comprises a spiral shell head and a double-screw bolt that is extended by this spiral shell head, this double-screw bolt comprises a large aperture portion that links to each other with this spiral shell head and a small-bore portion of being extended by this large aperture portion, this small-bore portion is arranged in this perforation, and the bottom surface butt of this large aperture portion should perforation peritreme and being electrically connected with this radiation line segment other end.

4. according to the wherein arbitrary described small size antenna of claim 1-3, wherein, this radiation line segment has by this outward extending one first radiant section of boring a hole, an end links to each other with this first radiant section and generally be one second vertical radiant section, and an end links to each other with this second radiant section and generally is one the 3rd vertical radiant section, the end of the 3rd radiant section be provided with this circuit board on the grounding parts that electrically connects of an earth point of a radio circuit, and the signal feed-in part that electrically connects with a load point of contiguous this grounding parts with this radio circuit.

5. small size antenna according to claim 4, wherein, contiguous this screw column of this earth point, this first radiant section and the 3rd radiant section are positioned at the same side of this second radiant section.

6. small size antenna according to claim 5, wherein, this perforation is a screw hole.

7. small size antenna according to claim 5, its working frequency range are 2402MHz～2480MHz.