KR20070071816A - Patch antenna - Google Patents

Abstract

A patch antenna is provided to improve antenna gain and to reduce backward radiation while reducing total size of the antenna without increasing thickness of a dielectric substrate. In a mobile communication terminal, a patch(340) is prepared on a stacked plate and resonates at a fixed frequency band. A ground panel performs grounding function and is prepared on the bottom of the stacked plate, and has at least one slot to move the resonant frequency band of the patch. The slot forms symmetry on the ground panel.

Description

Patch Antenna {PATCH ANTENNA}

1 is a perspective view of a patch antenna according to an embodiment of the present invention,

2a to 2g is a modified embodiment of the patch antenna according to an embodiment of the present invention,

3A is a cross-sectional view of a patch antenna having an additional dielectric layer in accordance with one embodiment of the present invention;

3b to 3c are perspective views of a patch antenna having a feed terminal according to an embodiment of the present invention;

4 is a cross-polarization parameter graph of FIG. 3B according to one embodiment of the present invention;

5 is a direction pattern diagram of FIG. 3B according to one embodiment of the invention;

6 is a gain value measurement graph for FIG. 3C according to one embodiment of the present invention;

7a to 7e is a modified embodiment of the microstrip outer feed terminal is formed in accordance with an embodiment of the present invention,

8 is a dependent frequency graph of gain for FIG. 7A according to an embodiment of the present invention.

<Description of Symbols for Main Drawings>

100: patch antenna 110, 320: dielectric layer

120: ground panel 130: slot

140, 330: substrate 150, 340: microstrip patch

300: patch antenna provided with a feed terminal

310: feed terminal 321: metal thin film

350, 702: Signal line 360, 703: Terminal terminal

700: patch antenna with microstrip outer feed terminal

701: micro strip outer feed terminal

The present invention relates to a patch antenna.

In general, the antenna receives radio waves from the outside (for example, an antenna attached to a base station, a repeater, and a wireless communication device) or serves to transmit an electrical signal generated from the communication device to the outside.

Increasing the service of mobile communication devices and miniaturization of mobile communication devices limits the space that antennas can occupy, and these spatial constraints make it difficult to use general chip antennas that form patterns on the ground and mount the antennas on them.

An antenna using a conventional U-shaped slot (U-Shaped Slot) used for a repeater or a base station has a single-layer structure, but is inappropriately large for application to a terminal, and the size of the ground increases as the size of the antenna increases. I have a problem.

In addition, in the conventional antenna structure, the high frequency band resonance is not suitable for the terminal due to the positions of the feed point and the ground point. That is, the conventional antenna has a problem that the antenna size should be larger in order to induce frequency resonance applied to the mobile communication service.

Accordingly, conventional microstrip antennas use slots of various shapes such as zigzag or H-shape in the radiation patch for miniaturization, while using a relatively high dielectric constant and shorting pins between the ground patch and the dielectric layer. And the like to reduce the area and thickness of the dielectric layer.

However, these conventional methods are not only easy to manufacture, but also increase the manufacturing cost because they are manufactured using shorting pins and various types of slots or using high dielectric constant dielectrics.

The present invention has been made to solve the above problems, and an object of the present invention is to reduce the size of the overall antenna without increasing the thickness of the dielectric plate, while improving antenna gain and reducing post radiation. To provide a patch antenna.

An object of the present invention is to provide a patch antenna for supplying microwaves provided with an additional dielectric layer and coaxial feed terminal.

Microstrip antenna according to a first aspect of the present invention for achieving the above object, the patch is provided on the laminated plate and resonates in a predetermined frequency band; A ground panel provided on the bottom surface of the laminate to perform a grounding function, and at least one slot is formed to move the resonant frequency band of the patch.

Specifically, a slot is formed in various forms on the upper side of the ground panel to induce resonance in the multi-band, and to move the resonance of the high frequency band to the low frequency band.

In addition, when the slot is at least two, it characterized in that the symmetrical with respect to the vertical, horizontal and diagonal.

In addition, the slot is characterized in that it is constantly arranged in a predetermined shape.

In addition, the slot is characterized in that at least one surface is bent at a right angle.

Microstrip antenna according to the second aspect of the present invention for achieving the above object is a feed terminal for supplying a microwave signal is mounted on the lower center of the dielectric on which the metal thin film is formed, a laminate laminated on the dielectric and a predetermined size on the laminate It is formed to include a patch connected to receive the microwave signal from the feed terminal.

In addition, a terminal terminal disposed at a predetermined position of the dielectric layer or spaced apart by a predetermined distance is further included.

In addition, the feed terminal and the terminal terminal is characterized in that the signal line is connected in at least one of the form of straight, bent and streamlined.

When described in detail based on an exemplary drawing of the present invention having such features as follows.

1 is a block diagram of a patch antenna according to an embodiment of the present invention.

Referring to FIG. 1, a patch antenna 100 according to an embodiment of the present invention includes a dielectric layer 110, a ground panel 120, a slot 130, a substrate 140, and a microstrip patch 150. .

The patch antenna 100 according to the embodiment of the present invention has a structure in which the ground panel 120 of the conductive metal is deposited on the top surface of the dielectric layer 110, and the substrate 140 and the microstrip patch 150 are formed on the ground panel 120. Has

Here, if the dielectric layer 110 is formed thick, the antenna can be designed to be smaller, but as the efficiency of the antenna and the radiation gain are deteriorated, the thickness of the dielectric layer 110 is formed to be the same as the conventional one. In addition, the ground panel 120 may be deposited to have a size proportional to the size of the dielectric layer 110.

Here, the patch antenna 100 according to the present invention, by forming a slot 130 in the upper surface of the ground 120 to improve the gain of the antenna while reducing the rear firing. The slot 130 may induce resonance in a multi-band and move a resonance of a high frequency band to a low frequency band, that is, supply a resonance frequency. Here, the slot 130 is preferably formed in the same size and spacing, the size, spacing, shape is variable according to the resonance frequency to be applied.

That is, while the slot 130 is formed on the ground panel 120 in a predetermined shape, the slot 130 does not interfere with the inherent function of the slot 130, maintains the wavelength length in the frequency band used and provides a good impedance matching point. Minimizing the size of the patch antenna 100 to find is within the scope of the present invention.

A substrate 140 in the form of various electrical elements is placed in the upper center of the ground panel 120, and a microstrip patch 150 having a predetermined shape is stacked on the upper surface of a conductive metal such as copper or aluminum.

2a to 2g is a modified embodiment of the patch antenna according to the present invention.

2A to 2G, FIG. 2A is a structure in which two pairs of stick-shaped slots 130 are symmetrically formed on the ground panel 120 in the X and Y axes, and FIG. 2B is a pair of 'b's. 'The slot is a structure formed symmetrically with respect to the diagonal of the patch antenna (100). 2c shows a structure in which a pair of 'c'-shaped slots 130 are symmetrically formed with respect to the y axis, and FIG. 2d shows a structure in which a pair of' c'-shaped slots 130 are symmetrically formed with respect to the x axis. to be. 2E is a structure in which the circular slots are symmetrically formed with respect to the X axis, and FIG. 2F is a structure in which the circular slots are symmetrically formed with respect to the Y axis, and FIG. Formed structure.

The slot may be included in the scope of the present invention that can be a slot shape of a polygon, including a circle, a triangle and a rectangle.

In the patch antenna 100, when the overall size of the conductor is increased, the resonant frequency of the high frequency is induced at low frequency. On the contrary, when the size of the conductor is reduced, the resonant frequency can be induced at the high frequency. Therefore, as the overall size of the patch antenna 100 is minimized and the shape of the slot 130 is variously modified, an optimal resonance frequency may be induced and various antenna characteristics may be induced.

In addition, the patch antenna 100 may be applied to a multiplexing service capable of transmitting and receiving multi-channel information having different wavelengths, and may be embedded or mounted in various communication equipment.

3A is a cross-sectional view of a patch antenna having an additional dielectric layer in accordance with one embodiment of the present invention. Referring to FIG. 3A, the patch antenna 300 having the additional dielectric layer 320 and the feed terminal 310 is inserted into the dielectric layer 320 to supply a microwave signal and electrically connected to the substrate 330. The feed terminal 310, the additional dielectric layer 320 on which the metal thin film 321 is formed, the substrate 330, and the microstrip patch 340. Descriptions of the functions and arrangement of the respective components have been described above with reference to FIGS. 1 to 2D, and thus descriptions thereof will be omitted.

3B to 3C are modified perspective views in which a feed terminal is provided on a patch antenna according to an embodiment of the present invention. 3B to 3C, FIG. 3B is a first modified perspective view of a patch antenna having a feed terminal.

A feed terminal 310 is provided at the center of the patch antenna 300, and a physical signal line 350 is connected to the feed terminal 310 so as to be parallel to the patch antenna 300. A terminal terminal 360 for connecting to an external module is provided at the end of the signal line 350.

In addition, Table 1 below shows a frequency range (frequency category) of 25 MHz band, a gain of 0.857142 dBi, and a cross polarization parameter from a satellite digital multimedia broadcasting (SDMB) patch antenna equipped with a feed terminal. Is the result table where the result value is measured to be less than 100deg at -22.5dB and 3dB.

Frequency range 25 MHz Gain 0.857142 dBi Cross polarization parameter -22.5 dB Beamwidth 3 dB ~ 100deg

3C is a second modified perspective view of the patch antenna including a feed terminal.

A feed terminal 310 is provided at the center of the patch antenna 300, and a physical signal line 350 is connected to the feed terminal 310 so as to be perpendicular to the patch antenna 300. A terminal terminal 360 for connecting to an external module is provided at the end of the signal line 350.

4 is a graph of cross-polarization parameters for the patch antenna of FIG. 3B according to an embodiment of the present invention. Patch antennas with the feed terminal 310 (FIGS. 3A and 300) were found to have a left polarization (LHCP) gain value of G = 3 to 3.4 dBi in the available frequency bandwidth of 25 MHz. Referring to FIG. 4, it can be seen that the return loss is the lowest at the available frequency of 2.61 GHz.

5 is a direction pattern diagram of the patch antenna of FIG. 3B according to an embodiment of the present invention.

Referring to FIG. 5, the signal strength according to the directionality of the patch antennas (FIG. 3A and 300) on which the feed terminal 310 is formed is shown. The optimum state indicates that 0dB of the highest signal strength is measured at the slope 0deg. have.

6 is a gain value measurement graph for FIG. 3C according to one embodiment of the present invention.

As shown in FIG. 6, it can be seen that an average gain value of 3 dBi or more was measured in the 25 MHz increased frequency band of 2.602 GHz to 2.628 GHz, and the gain value was also lowered from the time point downward in the interval.

7A to 7B are modified embodiment views in which the microstrip outer feed terminal is formed in various forms according to an embodiment of the present invention.

As illustrated in FIGS. 7A to 7E, the microstrip outer feed terminal 701 may be formed at various positions of an alumina substrate. On the basis of the position of the microstrip outer feed terminal 701 on the substrate, the microstrip may be disposed on the upper right, lower right, lower left, right end and left end.

In addition, the position of the terminal terminal 703 may be disposed on the upper left side, the upper right side, the right end, and the lower left side on the basis of being placed on the dielectric layer, so that the microstrip outer feed terminal 701 and the terminal terminal 703 are located. 7A to 7E form a variety of patch antennas modified as shown in FIGS. 7A to 7E, and various gain values may be measured at various frequency ranges.

FIG. 8 is a graph of the dependent frequency of the gain for FIG. 4A in accordance with an embodiment of the present invention. FIG. In the patch antenna (FIGS. 4A and 700) equipped with the microstrip outer feed terminal, it can be seen that an available frequency band having an optimal gain value is measured at a gain value of 2.6 to 3.6 dBi within a 26 MHz range of 2.49 GHz to 2.515 GHz.

In addition, Table 2 shows the central frequency 2.51 GHz from the patch antenna equipped with a microstrip outer feed terminal (Figure 4a, 700), the bandwidth below 26MHz, the minimum gain in bandwidth (bypass) The minimum gain in the polarized bandwidth is 2.6dBi or less and Beamwidth (beam width at 3dB) is 95deg or less.

Central frequency 2.51 GHz Bandwidth (-10dB or less) ~ 26 MHz Minimal gain in bandwidth (RHCP) ~ 2.6 dBi Beamwidth (beam width at 3 dB) ~ 95deg

What has been described above is only an embodiment for the patch antenna according to the present invention, the present invention is not limited to the above-described embodiment, the invention without departing from the gist of the invention as claimed in the claims below Anyone with ordinary knowledge in this field will have the technical spirit of the present invention to the extent that various modifications can be made.

As described above, the present invention achieves the effect of reducing the size of the overall antenna without increasing the thickness of the dielectric panel by adding slots to the ground panel to increase antenna gain and reduce radiation.

Another effect of the present invention is that the feed terminal and the terminal terminal can be arranged in various locations to obtain the effect that the patch antenna that can be utilized in various forms.

Claims (8)

In the mobile communication terminal, A patch provided on the laminate and resonating in a predetermined frequency band; A patch antenna, comprising: a ground panel provided on a bottom surface of the laminate to perform a grounding function, and a ground panel having at least one slot formed therein for shifting a resonant frequency band of the patch. The method of claim 1, The slot antenna is characterized in that formed on the ground panel to be symmetrical to each other. The method of claim 2, When the slot is at least two, the patch antenna, characterized in that formed symmetrically based on the vertical, horizontal and diagonal. The method of claim 2, The slot antenna is characterized in that formed in a predetermined shape. The method of claim 2, The slot antenna is characterized in that at least one surface is bent form. In the mobile communication terminal, A feed terminal mounted at a lower center of the dielectric having a metal thin film thereon to supply a microwave signal to the metal thin film; A laminate laminated on the dielectric; And And a patch formed on the laminate and connected to receive the microwave signal from the feed terminal. The method of claim 6, The patch antenna further comprises a terminal terminal disposed at a predetermined position of the dielectric layer or spaced apart by a predetermined distance. The method according to any one of claims 6 to 7, The feed antenna and the terminal terminal is a patch antenna, characterized in that the signal line is connected in at least one of the form of straight, bent and streamlined.

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