KR200361908Y1 - Multiband internal antenna for independently adjusting resonant frequency bands - Google Patents

Abstract

The present invention relates to a built-in antenna, and in particular, in a multi-band built-in antenna having a multi-band resonant frequency, each resonant frequency band is individually adjusted through different corresponding radiating elements, thereby affecting different resonant frequencies in the adjustment process of each resonant frequency. It provides a multi-band internal antenna that can be adjusted independently of the resonant frequency band can be adjusted independently of the desired resonant frequency.

Description

MULTIBAND INTERNAL ANTENNA FOR INDEPENDENTLY ADJUSTING RESONANT FREQUENCY BANDS}

The present invention relates to a built-in antenna, and in particular, in a multi-band built-in antenna having a multi-band resonant frequency, each resonant frequency band is individually adjusted through different corresponding radiating elements, thereby affecting different resonant frequencies in the adjustment process of each resonant frequency. The present invention relates to a multiband internal antenna capable of adjusting an independent resonant frequency band so that the desired resonant frequency can be independently adjusted.

An antenna is a conductor installed in the air to efficiently radiate radio waves into a space for the purpose of communication in a wireless communication, or to efficiently radiate electromotive force by radio waves, and is an apparatus for transmitting or receiving electromagnetic waves into a space for transmission and reception. .

The basic principle of the antenna is the same, but the shape varies depending on the frequency used. In order to operate the antenna efficiently, the antenna is resonated at the frequency using the antenna.

In recent years, portable wireless communication devices perform various functions such as GPS, data communication, authentication, and payment as well as simple voice calls, thereby expanding the scope of application. In addition, it must have a function capable of providing a plurality of resonant frequency bands.

For example, 800 MHz band used for DCN, GSM850, GSM900, etc., 1800 MHz band used by K-PCS, DCS1800, USPCS, etc., 2 GHz band used for UMTS frequency band, 2.4 GHz band used for WLL, WLAN, Blue Tooth, etc. The demand to operate a wireless communication device in a complex manner requires the development and development of a multiband antenna.

Moreover, the antenna of portable wireless communication devices such as mobile phones among the wireless communication devices that are becoming a necessity in the modern society is in the technical and strategic situation in which the size of the antennas must be smaller while the performance is further improved in accordance with the trend of becoming smaller and lighter. Lies.

In particular, in recent years, the design of a portable wireless communication device is not limited, and the adoption of a built-in antenna that has advantages such as excellent design of the antenna itself and simplicity of portability is increasing rapidly. How to efficiently implement a multi-band internal antenna that can resonate the frequencies of the multi-band has become a key task of antenna research and development.

For convenience of description, a general multiband internal antenna is illustrated in FIGS. 1A to 3B. As shown, Figures 1a and 1b is a view showing the frequency resonance characteristics of a conventional triple-band internal antenna and antenna, Figures 2a and 2b is the radiation to determine the second resonant frequency in the triple-band internal antenna of Figure 1a 3A and 3B are diagrams illustrating an antenna and an antenna resonance characteristic of the antenna from which a radiation element for determining a third resonance frequency is removed in the triple band internal antenna of FIG. 1A.

FIG. 1A illustrates a general form of a radiation element of a conventional triple band internal antenna, and shows frequency resonance characteristics of the triple band as shown in the graph of FIG. 1B.

As shown in FIG. 2A, when the radiation element for determining the second resonance frequency is removed from the triple band internal antenna of FIG. 1A, as shown in the graph of FIG. 2B, the third resonance frequency is a band of the second resonance frequency. As they move, they show a completely different frequency resonance.

Similarly, as shown in FIG. 3A, when the radiation element for determining the third resonant frequency is removed from the triple band internal antenna of FIG. 1A, the first resonant frequency is wider in the high frequency band as shown in the graph of FIG. 3B. Moving to, the characteristics of the second resonant frequency also shows a greatly changed frequency resonance characteristics.

In general, a multiband internal antenna has to obtain a multi-resonance characteristic by arranging radiation elements in a narrow and limited storage space, thereby inducing multiple resonances using radiation elements having various lengths, widths, and shapes. At this time, as described above, in the process of adjusting each resonance frequency, other unwanted resonance frequencies change together due to the mutual influence of each radiation element.

Therefore, in order to set a desired multi-band resonant frequency, one resonant frequency should be adjusted first, then another resonant frequency, and then the first resonant frequency must be adjusted.

As a result, as the radiation element increases, the resonant frequency control requires a repetitive operation that reduces trial and error, and thus requires a lot of time and effort to develop the antenna.

Accordingly, an object of the present invention for solving the above problems is to implement a multi-band internal antenna that can be used in a complex frequency band, so as not to affect the other resonant frequency in the process of adjusting each resonant frequency to achieve the desired resonant frequency An object of the present invention is to provide a multiband internal antenna capable of easily adjusting an independent resonant frequency band.

1A and 1B are diagrams illustrating frequency resonance characteristics of a conventional triple band internal antenna and an antenna;

2A and 2B are diagrams illustrating resonance characteristics of an antenna and an antenna from which a radiation element for determining a second resonance frequency is removed in the triple band internal antenna of FIG. 1A;

3A and 3B are diagrams illustrating an antenna and an antenna resonance characteristic in which the radiation element for determining a third resonance frequency is removed in the triple band internal antenna of FIG. 1A;

4A and 4B are diagrams illustrating antenna resonance characteristics according to width adjustments of a dual band internal antenna and a downward bending piece for adjusting an upper band resonance frequency of an antenna according to an exemplary embodiment of the present invention;

5A and 5B are diagrams illustrating frequency resonant characteristics of a triple band internal antenna and an antenna in which an additional radiation element for determining an intermediate band resonant frequency is added to the dual band internal antenna of FIG. 4A;

6 is a view showing the antenna resonance characteristics according to the length adjustment of the additional radiation element of the triple-band internal antenna according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: main radiation element 110: additional radiation element

120: auxiliary radiator 130: downward bending

140: power supply unit 150: short circuit

160: ground plane

In order to achieve the above object, the present invention provides a multi-band internal antenna,

A main radiation element having one end connected to the short circuit part and vertically connected to the ground plane, and one side connected to the power supply part, and configured to form an upper surface of the antenna in a rectangular shape;

A downwardly bent piece which is formed to be bent downwardly by a predetermined length from an outer side of the other end of the main radiating element, and finely adjusts an upper band resonance frequency to be resonant by adjusting a width;

Extends in parallel between the main radiating element and the ground plane at the side of the bent piece, and the total length including the main radiating element and the down bent piece is formed to be 0.25 wavelength of the lower band resonant frequency to be resonated. Provides a multi-band internal antenna capable of adjusting the independent resonant frequency band, characterized in that consisting of; an auxiliary radiation element for fine-adjusting the lower band resonant frequency by adjusting the length.

In addition, the multi-band internal antenna capable of adjusting the independent resonant frequency band according to the present invention to achieve the above object, from the inner edge of the main radiation element toward the inner edge opposite the inner edge of the main radiation element And an additional radiating element extending horizontally with and resonating the middle band resonant frequency without changing the upper band resonant frequency and the lower band resonant frequency.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as much as possible even if they are displayed on different drawings. And a detailed description of known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

4A and 4B are diagrams illustrating antenna resonance characteristics according to length adjustment of a dual band internal antenna and a main radiation device for adjusting an upper band resonance frequency of an antenna according to an exemplary embodiment of the present invention.

4A and 4B, the dual band internal antenna according to the present invention resonates the DCN service band by using the main radiating element 100, the downward bending piece 130, and the auxiliary radiating element 120. The resonant frequency of the satellite DMB service band is adjusted by adjusting the width L1 of the downward bending piece 130 connecting the main radiating element 100 and the auxiliary radiating element 120.

At this time, when adjusting the width L1 of the downward bending piece 130, since the lower band resonance frequency, which is the resonance frequency of DCN, does not move, only the width L1 of the downward bending piece 130 is adjusted to adjust the satellite DMB service band. It is possible to adjust the resonant frequency of.

Accordingly, since the dual band internal antenna according to the present invention can independently adjust one resonance frequency without changing the other resonance frequency, the antennas can be quickly and accurately adjusted when the antenna is manufactured and adjusted. Will be.

As an example of the dual-band internal antenna according to the present invention, the antenna of Figure 4a is a main radiation element 100, downward bending piece in the range of 30mm horizontal, 8mm vertical, 5mm height (distance from the ground) 130 and the size of the auxiliary radiating element 120 was tested, the results are shown in Figure 4b.

5A and 5B are diagrams illustrating frequency resonant characteristics of a triple band internal antenna and an antenna in which an additional radiating element 110 is added to the dual band internal antenna of FIG. 4A to determine a third resonant frequency as an intermediate band.

As shown in FIGS. 5A and 5B, the triple band internal antenna according to the present invention is an additional radiation element 110 added to the dual band internal antenna of FIG. 4A, and the resonance frequency of the DCN and satellite DMB service bands is about. It moves about 40MHz, which can be easily solved by adjusting the length of the auxiliary radiating element 120 and the width L1 of the downward bending piece 130.

Therefore, the triple band built-in antenna according to the present invention is the main radiating element 100, the down bending piece 130 and the auxiliary radiating element 120 to form the entire antenna body to determine the resonant frequency of the DCN service band Adjust the length of, and adjust the length of the additional radiation element 110 to determine the resonant frequency of the K-PCS service band.

In more detail, the total length of the main radiation element 100, the downward bending piece 130 and the auxiliary radiation element 120 is set to 0.25 wavelength of the resonance frequency of the DCN service band, The length of the auxiliary radiating element 120 is adjusted for fine adjustment, and the width L1 of the downturned piece 130 is used to finely adjust the resonance frequency of the satellite DMB service band which appears together with the resonance frequency of the DCN service band. By adjusting), each resonant frequency can be adjusted independently without affecting other resonant frequencies.

As an example of the triple-band internal antenna according to the present invention, the main radiation device 100 of FIG. 5A has a width of 30 mm, a length of 8 mm, and a height (separation distance from the ground) of 5 mm, similar to the antenna of FIG. 4A. In the experiment to adjust the size of the main radiation element 100, the downward bending piece 130, the auxiliary radiation element 120 and the additional radiation element 110, the results are shown in Figure 5b.

In an independent resonant frequency band adjusting method of a dual band internal antenna according to the present invention, in the first step, the main radiating element 100, the downward bending piece 130, and the auxiliary radiating element 120 of FIG. By adjusting the total length, determine the first resonant frequency you want to resonate with. At this time, the total length of the main radiation element 100, the downward bending piece 130 and the auxiliary radiation element 120 is adjusted to 0.25 wavelength of the first resonance frequency (lower band resonance frequency: DCN resonance frequency).

Subsequently, in the second step, the length of the auxiliary radiating element 120 is adjusted to finely recombine the first resonant frequency to accurately resonate in a desired frequency band.

In the third step, the width L1 of the downward bending piece 130 is adjusted to obtain a second resonant frequency (upper band resonant frequency: resonant frequency of satellite DMB) which is resonated with the first resonant frequency. Resonance is performed in the desired frequency band by fine tuning without changing the second resonance frequency.

In this case, since the first resonant frequency does not change regardless of the width L1 of the downward bent piece 130, the third resonant frequency may be adjusted quickly and simply regardless of the first resonant frequency.

As shown in FIG. 4B, the third resonant frequency is finely adjusted by adjusting the width L1 of the downward bent piece 130, and the first resonant frequency is unchanged.

In addition, as shown in Figure 5a, the independent resonant frequency band adjustment method of the triple-band internal antenna according to the present invention in the first and third steps, the independent resonance frequency of the dual-band internal antenna of Figure 4a Follow the band adjustment method.

After the third step, the additional radiation device 110 is added to FIG. 4A to adjust the second resonance frequency (intermediate band resonance frequency: resonant frequency of the K-PCS service band) in the fourth step.

In this case, in order to resonate the second frequency band in the limited space inside the portable wireless communication device, the additional radiation device 110 is preferably provided with a meander line.

On the other hand, as shown in Figure 5b, even if the additional radiation element 110 is added, the change in the neighboring first and third resonant frequency is insignificant. The change of the first and third resonance frequencies generated as a result of the addition of the additional radiation element 110 is quickly and accurately adjusted as the length adjustment of the downward bending piece 130 and the auxiliary radiation element 120.

FIG. 6 is a diagram illustrating antenna resonance characteristics according to length adjustment of an additional radiation element of a triple band internal antenna according to an exemplary embodiment of the present invention.

As shown in Figure 6, by adjusting the length of the additional radiation element 110 it is possible to adjust the second resonant frequency without changing the first and third resonant frequency, it is possible to adjust the resonant frequency of the triple band built-in antenna It can be done more easily and simply.

In addition, the multi-band internal antenna according to the present invention can be applied within the range of the ground plane size of 30-40 horizontal, 60-100mm vertical, as well as the bar-type (Folder-Type) and It can be variously applied to a slide-type mobile phone.

Meanwhile, in the multi-band internal antenna according to the present invention, the main radiation device 100, the downward bending piece 130, and the auxiliary radiation device 120 are regarded as one radiation element (hereinafter referred to as 'first radiation element'). In this case, the main radiation device 100 may be regarded as a main pattern, the auxiliary radiation device 120 may be regarded as an auxiliary pattern, and the additional radiation device 110 may be regarded as a second radiation device. Same as

The present invention is one side is connected to the feeder, one end is connected to the short-circuit vertically connected to the ground plane, the main pattern to form a top surface of the antenna in a rectangular form to the other end to extend horizontally from the one end to the short-circuit And a downwardly bent piece extending downwardly by a predetermined length from the outside of the other end to finely adjust an upper band resonant frequency to be resonated by adjusting a width, and an upper surface of the antenna and a ground plane at a side of the downwardly bent piece. It extends by a predetermined length in parallel therebetween, and consists of an auxiliary pattern for fine-adjusting the lower band resonance frequency (DCN resonance frequency) to be resonated by adjusting the length.

The total length of the main pattern, the downward bent portion and the auxiliary pattern according to the present invention is formed to be 0.25 wavelength of the lower band resonance frequency to constitute a first radiation device.

In addition, the present invention extends horizontally from one side of the inner edge of the main pattern of the first radiation element having a rectangular shape toward the opposite inner edge for triple band resonance, the lower band resonance frequency and the upper band resonance frequency. And a second radiation element for generating an intermediate band resonant frequency without changing and adjusting the length to finely adjust the intermediate band resonant frequency.

As described above, since the multi-band internal antenna according to the present invention can adjust each resonant frequency independently of other resonant frequencies, the multi-band internal antenna can be easily manufactured to resonate a plurality of frequency bands in a limited space. The resonance characteristics of the antenna can be adjusted quickly and accurately.

On the other hand, in the detailed description of the present invention has been described with reference to specific embodiments, of course, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the scope of the utility model registration request described below and the equivalents of the utility model registration request.

As described above, when the multi-band resonant frequency is adjusted, each resonant frequency can be adjusted independently without the influence of other resonant frequencies, thereby greatly reducing the time and effort required for resonant frequency adjustment.

Therefore, the present invention has an effect of producing an antenna having a multi-band resonant frequency more accurately and economically with less cost, time and effort.

Claims (10)

In the multi-band internal antenna, A main radiation element having one end connected to the short circuit part and vertically connected to the ground plane, and one side connected to the power supply part, and configured to form an upper surface of the antenna in a rectangular shape; A downwardly bent piece which is formed to be bent downwardly by a predetermined length from an outer side of the other end of the main radiating element, and finely adjusts an upper band resonance frequency to be resonant by adjusting a width; Extends in parallel between the main radiating element and the ground plane at the side of the bent piece, and the total length including the main radiating element and the down bent piece is formed to be 0.25 wavelength of the lower band resonant frequency to be resonated. And an auxiliary radiating element for fine-adjusting the lower band resonant frequency by adjusting a length of the multi band internal antenna of the independent resonant frequency band. The method of claim 1, wherein the upper band resonance frequency and the lower band resonance frequency, Multiband internal antenna with independent resonant frequency band, characterized in that the resonant frequency of the satellite DMB and DCN service band, respectively. The method of claim 1, And a dielectric in which the main radiating element, the downward bending piece, and the auxiliary radiating element are bonded and fixed between the ground plane and the upper surface of the antenna. The method of claim 1, Extending horizontally from the inner edge of the main radiation element toward the inner edge opposite the inner edge to the main radiation element, thereby resonating the intermediate band resonance frequency without changing the upper band resonance frequency and the lower band resonance frequency. An additional radiation element; Multiband internal antenna capable of adjusting the independent resonant frequency band, characterized in that it further comprises. The method of claim 4, wherein the upper band resonance frequency, the lower band resonance frequency and the intermediate band resonance frequency, Multiband internal antenna with independent resonance frequency adjustment, characterized in that the resonant frequency of the satellite DMB, DCN and K-PCS service bands respectively. The method of claim 4, wherein Independent resonant frequency band adjustment further comprises a dielectric between the ground and the upper surface of the antenna, the main radiating element, the downward bending piece, the auxiliary radiating element and the additional radiating element is fixed; Possible multiband internal antenna. The method of claim 4, wherein the additional radiation element, An independent resonant frequency band adjustable multi-band internal antenna, characterized in that for fine-adjusting the mid-band resonant frequency by adjusting the length. The method of claim 4, wherein the additional radiation element, Multiband internal antenna with independent resonant frequency band adjustment, characterized in that formed by meander line. The method of claim 8, wherein the additional radiation element, And an independent resonant frequency band adjustment capable of finely adjusting the midband resonant frequency by adjusting the meander line width. In the multi-band internal antenna, One side is connected to the feeder, one end is connected to the short-circuit vertically connected to the ground plane, the main pattern to form an upper surface of the antenna in a rectangular form to the other end to extend horizontally from the one end and spaced apart from the short-circuit, It is formed to be bent downward by a predetermined length from the outside of the other end, the down bending piece for fine-adjusting the upper band resonant frequency that is resonant by adjusting the width, and parallel between the antenna upper surface and the ground plane in the side of the down bending piece It is formed to extend by a predetermined length, and consists of an auxiliary pattern for fine-tuning the lower band resonant frequency is resonant by adjusting the length, the total length of the main pattern, the downward bent portion and the auxiliary pattern is 0.25 of the lower band resonance frequency A first radiation element formed to have a wavelength length; It extends horizontally from one side of the inner edge of the main pattern of the first radiation element having a rectangular shape toward the opposite inner edge, thereby generating an intermediate band resonance frequency without changing the lower band resonance frequency and the upper band resonance frequency. And a second radiation element for fine-adjusting the mid-band resonant frequency by adjusting the length.