CN1960057B - Device for adjusting frequency of antenna - Google Patents

Abstract

The invention discloses an antenna frequency adjustment device, which can be used to adjust the working frequency of a planar inverted "F" antenna or an "I" antenna. Plastic holder on the antenna mounting part. The slider has a contact portion that is in close contact with one side of the end of the antenna radiation portion and a control portion that is partially accommodated in the slot of the holder. By operating the control part to move along the slot of the holder, the size of the antenna radiation part covered by the contact part of the slider can be changed, so as to achieve the purpose of adjusting the frequency of the antenna. The antenna frequency adjusting device of the present invention can easily and quickly adjust the frequency of the antenna to be adjusted to the optimum working frequency.

Description

Antenna frequency adjustment device

【Technical field to which the invention belongs】

The invention relates to an antenna frequency adjustment device, especially an antenna frequency adjustment device that can be installed on a planar inverted "F" antenna (Planar Inverted-F Antenna, PIFA) or an I-shaped antenna.

【Background technique】

With the rapid development of mobile communications, people increasingly hope that they can access the Internet anytime and anywhere with a notebook computer or other portable terminals. The wireless access mode based on GPRS (General Packer Radio Service, General Packet Radio Service) and WLAN (Wireless Local Area Network, Wireless Local Area Network) meets this demand of people to a certain extent. GPRS is a wireless network with wide area coverage, and its data transmission rate is about 30Kbps-50Kbps, while WLAN is a wireless network with local area coverage, and its data transmission rate can reach 11Mbps (based on 802.11b technology). People choose different wireless network cards and cooperate with portable terminals such as notebook computers to access the Internet anytime and anywhere. Since the WLAN data transmission rate can reach 11Mbps, public WLAN high-speed data services are provided in some hotspots (hotels, airports, cafes, business centers, and exhibition centers). After leaving the hotspot, it will automatically switch and maintain network connection through GPRS, etc. .

At present, wireless local area networks are mostly based on Bluetooth (Bluetooth) technology standards or IEEE 802.11 series standards. The working frequency band of the antenna in the Bluetooth technology standard falls on 2.4GHz, and the working frequency band of the antenna in the IEEE802.11 series technical standards falls on 2.4GHz and 5GHz respectively. The GPRS working frequency bands fall in 900MHz, 1800MHz and 1900MHz. Therefore, most of the antennas in notebook computers are multi-frequency antennas applied to the above frequency bands.

Planar Inverted-F Antenna (PIFA) is a small antenna commonly used in mobile communication terminals. It is characterized by small size and light weight, which can effectively reduce the occupied space and manufacturing cost, good impedance matching, and easy to realize dual-frequency or multi-frequency. Another very important feature of it is that it has both horizontal polarization and vertical polarization, and is suitable for places with complex electromagnetic environments.

As we all know, the radiation frequency of an antenna is inversely proportional to the length of the radiating part. When designing an antenna to work at a specific frequency, a designer must first determine the length of the radiating part of the antenna according to the operating frequency. However, the length of the radiating part of the plane inverted "F" antenna just produced from the production line generally has some deviations, and is generally longer than the length required for actual work, so that some deviations occur in the radiation frequency of the antenna, which cannot achieve the optimum The optimal working frequency affects the working performance of the planar inverted "F" antenna to a certain extent. Generally, before installing the antenna into a notebook computer or other portable terminals, the antenna needs to be trimmed so that the radiating part has an appropriate length, so as to achieve an optimal radiation frequency. Moreover, the operating frequency of the planar inverted "F" antenna is also affected by the internal space and structure of the notebook computer or other portable terminals using the planar inverted "F" antenna. Therefore, the flat antenna specially designed for a notebook computer or other portable terminals The inverted "F" antenna is installed in other notebook computers or other portable terminals, and its working frequency may deviate, so it cannot reach the best working frequency. At this time, the antenna needs to be trimmed to make it reach the best working frequency . However, the above method of trimming the radiating portion of the antenna to meet the requirements is not only time-consuming, labor-intensive, and inefficient, but also likely to be over-trimmed, and the radiating portion of the antenna is too small to be a waste product.

Considering the above-mentioned disadvantages, it is necessary to design a device capable of adjusting the frequency of the above-mentioned antenna.

【Content of invention】

The object of the present invention is to provide an antenna frequency adjustment device, which can adjust the operating frequency of the antenna by adjusting the dielectric constant of the medium around the antenna.

In order to achieve the above purpose, the antenna frequency adjustment device of the present invention is achieved through the following technical solutions:

An antenna frequency adjustment device, which is used to adjust the frequency of the antenna to be adjusted so that it reaches the required optimal operating frequency, it has a movable slider arranged on the radiation part of the antenna to be adjusted and a plastic holder fixed on the antenna The slider has a contact portion attached to one side of the radiation portion of the antenna to be adjusted, and the slider is installed on the holder.

An antenna frequency adjustment device is used to adjust the frequency of the antenna to be adjusted to achieve the required optimal operating frequency. It has a movable slider that is sleeved on the radiation part of the antenna to be adjusted and closely contacts with the radiation part.

Compared with the prior art, the advantage of the antenna made by the present invention is that the antenna can easily reach the optimum operating frequency by adjusting the size of the antenna radiation portion covered by the slider contact portion.

【Description of drawings】

Fig. 1 is a perspective view of the first embodiment of the antenna adjusting device of the present invention and its antenna to be adjusted.

FIG. 2 is a perspective view from another angle of FIG. 1 .

Fig. 3 is a perspective view of the antenna to be adjusted in the present invention.

Fig. 4 is a perspective view of the second embodiment of the antenna adjusting device of the present invention and the antenna to be adjusted.

【Detailed ways】

1 to 3 show the first embodiment of the antenna adjustment device 20 of the present invention. In this embodiment, the antenna to be adjusted is a dual-frequency planar inverted "F" antenna 10 (please refer to FIG. 3 shown), which includes a radiating part 11 , a grounding part 13 , a connecting part 12 connecting the radiating part 11 and the grounding part 13 , a feeder welding part 4 and a mounting part 15 . The radiation part 11 includes a first radiation part 110 and a second radiation part 112 . The ground portion 13 includes a first ground portion 131 on the same plane as the radiation portion 11 and a second ground portion 132 perpendicular to the first ground portion 131 . The connection part 12 is roughly in the shape of an inverted "T", and the feeder welding part 4 is formed by bending and extending vertically from the connection part 12. The free end 121 of the connection part 12 is also a radiation part, which together with the first radiation part 110 forms a high-frequency radiation department. Two installation parts 15 respectively extend from both ends of the grounding part 13, and are respectively provided with first openings for conveniently installing the planar inverted "F" antenna 10 on a notebook computer or other portable terminals (not shown). 151 and the second opening 152 for conveniently fixing the antenna adjustment device 20 on the plane inverted “F” antenna 10 .

The antenna frequency adjustment device 20 of the present invention includes a slider 30 that is closely attached to the two ends of the first radiating part 110 and the second radiating part 112, and is fixed on the mounting part 15 with bolts (not labeled) and placed on the grounding part 13. The plastic holder 21 on the second ground portion 132 . The slider 30 includes a contact portion 300 respectively in contact with the first radiation portion 110 and the second radiation portion 112 and a control portion 301 integrally formed with the contact portion 300 . The control part 301 has an extension part 302 extending outwards to facilitate the operation of the sliding block 30 and ribs (not shown) protruding from the upper and lower sides of the control part 301 respectively. A longitudinal slot 210 is defined in the plastic holder 21 corresponding to the radiation portion 11 of the planar inverted “F” antenna 10 . Two slots 220 are respectively defined on two sides of the slot 210 along the lengthwise direction. The ribs of the control part 201 are respectively accommodated in the slots 220 . By operating the extension part 302 of the control part 301 , the slider 30 can be moved along the longitudinal direction where the slot 210 is located.

The two sliders 30 are close to the ends of the first radiating part 110 and the second radiating part 112, because the dielectric constant of the air medium is the smallest, and the dielectric constant of general plastic materials is greater than that of air, thereby increasing The dielectric constant of the radiating medium of the planar inverted “F” antenna 10 is obtained. The increase of the dielectric constant increases the operating frequency of the planar inverted "F" antenna 10, thereby changing the original operating frequency of the antenna. Since the deviation of the generally produced planar inverted "F" antenna 10 is several millimeters (mm), the optimal operating frequency of the planar inverted "F" antenna 10 can be achieved through a small adjustment of the slider 30 .

The antenna in this implementation manner may also be any kind of planar inverted "F" antenna or "I" antenna.

Fig. 4 shows a second embodiment of the antenna adjusting device 20' of the present invention. In this embodiment, the antenna whose frequency is to be adjusted is the same dual-frequency planar inverted "F" antenna 10' as that of the first embodiment, and its structure will not be repeated here. The antenna frequency adjustment device 20' of the present invention is a plastic tetrahedral rectangular casing, and its opposite ends in the longitudinal direction have open ends 200'. The end of the radiating part of the planar inverted "F" antenna 10' penetrates into the rectangular housing from the open end 200', so that the antenna adjustment device 20' is sleeved on the end of the radiating part of the planar inverted "F" antenna 10'. By moving the position of the rectangular housing to change the size of the radiating part of the plastic rectangular housing covering the plane inverted "F" antenna 10', the purpose of adjusting the antenna frequency is achieved.

This embodiment can achieve exactly the same effect as the first embodiment, and it is also possible to add a plastic holder 21 as in the first embodiment to this embodiment, and extend the side of the antenna frequency adjustment device 20' of this embodiment A control part 201, so that the antenna frequency adjustment device 20' of this embodiment can be adjusted more accurately and conveniently, and can better prevent the antenna frequency adjustment device 20' from falling off from the radiation part.

Claims (7)

1. device for adjusting frequency of antenna, be used to regulate and wait that the frequency of regulating antenna makes it reach required frequency optimum traffic, it is characterized in that: device for adjusting frequency of antenna has slide block and plastics retaining piece, described slide block is to be located on the Department of Radiation of waiting to regulate antenna and removable, it has the contact site that is attached on Department of Radiation one side of waiting to regulate antenna, described slide block has the control part that makes things convenient for moving slider, and described control part is formed with two fins; Described plastics retaining piece is fixed in to be waited to regulate on the antenna, and offers a fluting, and described slide block is to be installed on described retaining piece, be contained in the fluting in and the fluting in slidably, the fluting in longitudinal edge on offer two grooves of accommodating described fin.

2. device for adjusting frequency of antenna as claimed in claim 1 is characterized in that: described control part comprises main part and extension, and described fin extends and is symmetrical arranged for autonomous body respectively.

3. device for adjusting frequency of antenna as claimed in claim 2 is characterized in that: described plastics retaining piece is to be fixed in to wait to regulate on the installation portion of antenna.

4. device for adjusting frequency of antenna as claimed in claim 1 is characterized in that: antenna described to be regulated is planar inverted F-shape antenna or I shape antenna.

5. device for adjusting frequency of antenna, be used to regulate and wait that the frequency of regulating antenna makes it reach required frequency optimum traffic, it is characterized in that: device for adjusting frequency of antenna has the movable sliding block that is sheathed on the Department of Radiation of waiting to regulate antenna and closely contacts with Department of Radiation, described Department of Radiation comprises first Department of Radiation and second Department of Radiation, slide block is close to first Department of Radiation and the terminal side of second Department of Radiation, described slide block has contact site, and described contact site is the plastic casing with openend that is sheathed on the Department of Radiation of waiting to regulate antenna.

6. device for adjusting frequency of antenna as claimed in claim 5 is characterized in that: described slide block also has the control part that makes things convenient for moving slider.

7. device for adjusting frequency of antenna as claimed in claim 6 is characterized in that: device for adjusting frequency of antenna also has a plastics retaining piece, and described control part partly is located in this plastics retaining piece.

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