KR101138247B1 - Planar type wideband antenna - Google Patents

Planar type wideband antenna Download PDF

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Publication number
KR101138247B1
KR101138247B1 KR1020100116036A KR20100116036A KR101138247B1 KR 101138247 B1 KR101138247 B1 KR 101138247B1 KR 1020100116036 A KR1020100116036 A KR 1020100116036A KR 20100116036 A KR20100116036 A KR 20100116036A KR 101138247 B1 KR101138247 B1 KR 101138247B1
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South Korea
Prior art keywords
inverted
ground plane
shaped non
folded monopole
monopole antenna
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KR1020100116036A
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Korean (ko)
Inventor
우종명
김기백
류홍균
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충남대학교산학협력단
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
    • H01Q1/2266—Supports; Mounting means by structural association with other equipment or articles used with computer equipment disposed inside the computer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/10—Resonant antennas

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Aerials (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar broadband antenna, in which an inverted L-shaped unpaid radiated by a reverse L-shaped non-powered element in a low frequency band and radiated by combining a printed folded monopole antenna and an inverted L-shaped non-powered element in a high frequency band The object is to provide a planar broadband antenna in which all the elements are combined.
The present invention for achieving this object relates to a planar broadband antenna, comprising: a substrate having a predetermined dielectric constant; A ground plane formed at a lower end of the substrate and formed on both sides including a front side and a rear side; And a radiating element connected to the coaxial cable of the ground plane and including a printed folded monopole antenna element and an inverted L-shaped non-powered element; Including, but the printed type folded monopole antenna element, a feed line extending vertically upward from the feed portion, and a short circuit line extending in the 'b' shape from the upper end of the feed line is connected to the ground plane The inverted L-shaped non-powered element extends from the ground plane to the inverted L-shape and is configured to surround the right side of the printed folded monopole antenna element.

Description

Planar Broadband Antenna {PLANAR TYPE WIDEBAND ANTENNA}

The present invention relates to a wideband printed folded monopole antenna that can be applied to a laptop computer. More specifically, the feeder widens the feed element based on the printed folded monopole antenna to be compact and wideband. The present invention relates to a planar broadband antenna in which an L-type non-powered element is combined.

Recently, various types of computers such as tablet PCs have been developed.

These computers are equipped with wireless communication systems such as WiMAX (2.3 GHz, 3.3 GHz, 5.7 GHz), wireless LAN (2.4 GHz), Bluetooth (2.4 GHz), and UWB (3.1-10.6 GHz). . When the antenna is mounted on the computer, a lot of antenna installation space is required, and a large number of antennas and installation spaces increase the price of the product.

Therefore, there is a need for a small, planar broadband antenna capable of accommodating WiMAX, WLAN, Bluetooth, and UWB communication systems (2.3-10.6 GHz) with one antenna.

As a conventional multiband antenna for laptop computers, antennas using branch lines and antennas using coupling feeding were developed based on the inverted-F antenna. In addition, a monopole type antenna has been studied as a UWB antenna for laptops based on a printed monopole antenna, and a modified monopole antenna for wireless LAN and UWB band has been developed. However, these antennas do not accommodate the 2.3 ~ 10.6GHz band and has a big disadvantage of the size of the antenna.

The present invention has been made in view of the above problems, in the low frequency band is radiated by an inverted L-shaped non-powered element, and in the high frequency band radiated by combining a printed folded monopole antenna and an inverted L-shaped non-powered element, It is an object of the present invention to provide a planar broadband antenna in which an inverted L-shaped non-powered element is combined.

In order to achieve the above technical problem, the present invention relates to a planar broadband antenna, the substrate having a predetermined dielectric constant; A ground plane formed at a lower end of the substrate and formed on both sides including a front side and a rear side; And a radiating element connected to the coaxial cable of the ground plane and including a printed folded monopole antenna element and an inverted L-shaped non-powered element; Including, but the printed type folded monopole antenna element, a feed line extending vertically upward from the feed portion, and a short circuit line extending in the 'b' shape from the upper end of the feed line is connected to the ground plane The inverted L-shaped non-powered element extends from the ground plane to the inverted L-shape and is configured to surround the right side of the printed folded monopole antenna element.

delete

According to the present invention as described above, unlike the existing antenna that accommodates only the wireless LAN and UWB band, it can accommodate from a low frequency band to a high frequency band, a plurality of wireless communication systems (WLAN, Bluetooth, WiMAX, UWB) band can be accommodated.

In addition, according to the present invention, since the two-dimensional planar structure is easy to install and reduce in size, it is also possible to install a single antenna that can be printed on a substrate to minimize antenna allocation space and reduce cost.

1 is an exemplary view for showing a manufacturing process of a planar broadband antenna (A) according to an embodiment of the present invention.
2 is a graph showing simulated return loss and input impedance characteristics of a printed folded monopole antenna element according to an embodiment of the present invention.
3 is a structural diagram of a planar broadband antenna A according to an embodiment of the present invention using a radiating element in which a printed folded monopole antenna element and an inverted L-shaped non-powered element are combined.
4 is a graph showing a result of measuring a return loss of the planar broadband antenna A according to an embodiment of the present invention, and a simulation result.
5 is a graph showing the measured radiation pattern according to the frequency of the planar broadband antenna A and the maximum gain in the operating frequency according to an embodiment of the present invention.
6 is a structural diagram of an antenna according to a first modification of the present invention;
7 is a structural diagram of an antenna according to a second modification of the present invention;

Specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. In the meantime, when it is determined that the detailed description of the known functions and configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, it should be noted that the detailed description is omitted.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

A planar broadband antenna according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7 as follows.

1 is an exemplary view for showing a manufacturing process of a planar broadband antenna A according to an embodiment of the present invention, Figure 1 (a) is a structure of a printed folded monopole antenna element 310, ( b) is a structure of the inverted L-shaped non-powered element 320, (c) is a structure in which the printed folded monopole antenna 310 and the inverted L-shaped non-powered element 320 is combined.

The printed folded monopole antenna element 310 has a feed line 311 extending vertically upward from a feeding portion, and extends in a 'b' shape from an upper end of the feed line 311 to a ground plane. It includes a short circuit line 312 connected.

At this time, the width of the feed line 311 is 5.1mm, 25.5 times wider than the width of the short circuit line 312. Therefore, the resistance component change according to the frequency change can be reduced.

2 is a graph showing simulated return loss and input impedance characteristics of a printed folded monopole antenna element 310 according to an embodiment of the present invention.

As shown in (a) of FIG. 2, the return loss is the lowest at 6 GHz, and as shown in (b) of FIG. 2, the input impedance has a flat resistance characteristic of 35 kHz and a capacitive reactance in the 2.5 to 7 GHz band. The characteristics are shown.

Here, broadband impedance matching from 2.3 to 10.6 GHz is possible if the frequency is lowered and the reactance component is compensated for to reduce the return loss of the 2.3 GHz band.

Accordingly, the inverted L-shaped non-powered element 320 as shown in FIG. 1B is capable of impedance matching in all bands including the low frequency band (2.3 GHz) and the antenna size of FIG. Combine as in (c).

That is, the inverted L-shaped non-powered element 320 extends from the ground plane to the inverted L-shape and is configured to surround the right side of the printed folded monopole antenna element 310.

Accordingly, the inductance is increased by the inverted L-shaped non-powered element 320, so that the capacitive printed folded monopole antenna element 310 can be impedance-matched in a wide band.

As described above, the radiating element 300 combined with the printed folded monopole antenna element 310 and the inverted L-shaped non-powered element 320 adjusts the length L of the inverted L-shaped non-powered element 320. Through impedance matching in the low frequency band (2.3GHz). In addition, impedance matching can be performed in a high frequency band (5 to 11 GHz) by mutual impedance according to the horizontal gap S between the inverted L-shaped non-powered element 320 and the printed folded monopole antenna element 310. have.

In this embodiment, the length L of the optimized reverse L-shaped non-powered element 320 is 13.75 mm, and the horizontal L between the reverse L-shaped non-powered element 320 and the printed folded monopole antenna element 310 is in a horizontal shape. The interval S is 0.25 mm. The overall size of the radiating element 300 of the planar broadband antenna A is 13.75 (1λ / 10) mm x 12 (1λ / 11) mm (where λ is a wavelength of 2.27 GHz).

Therefore, in the low frequency band is radiated by the inverted L-shaped non-powered element 320, in the high frequency band, the printed folded monopole antenna element 310 and the inverted L-shaped non-powered element 320 are combined and radiated.

3 illustrates a planar broadband antenna A according to an embodiment of the present invention using the radiating element 300 in which the above-described printed folded monopole antenna element 310 and the reverse L-shaped non-powered element 320 are combined. It is a structural diagram.

The planar broadband antenna A is a substrate 100 having a predetermined dielectric constant (ε r = 4.6), a ground plane 200 formed on both sides including a front surface or a rear surface of the substrate 100, And a radiating element 300 connected to the coaxial cable of the ground plane 200.

In this embodiment, the size of the ground plane 200 is 120 (0.9λ) mm × 40 (0.3λ) mm, and the size of the radiating element 300 is 13.75 (0.11λ) mm × 12 (0.9λ) mm. to be. Meanwhile, when the ground plane 200 is formed on both sides of the substrate 100, the front ground plane and the rear ground plane are electrically shorted through vias formed on the outer circumferential surface of the ground plane 200.

4 is a graph showing the results of measuring the return loss of the planar broadband antenna A according to an embodiment of the present invention and a simulation result, and the simulation result and the measurement result agree well, and the measured -10 dB bandwidth is 2.27 to 11 GHz (4.85: 1) accommodates WiMAX (2.3 GHz 3.3 GHz, 5.7 GHz), WLAN (2.4 GHz), Bluetooth, and UWB system bandwidth.

FIG. 5 is a graph showing the measured radiation pattern and the maximum gain in the operating frequency according to the frequencies (2.3, 4, 7, 10 GHz) of the planar broadband antenna A according to the embodiment of the present invention. As shown in a), zx-plane

Figure 112010076003540-pat00001
Is a radiation component caused by vertical elements and forms omnidirectional radiation patterns in low frequency bands such as 2.3 GHz and 4 GHz. Indicated.

In addition, as shown in FIG. 5B, the zy-plane

Figure 112010076003540-pat00002
Is a horizontal radiating element, and omnidirectional radiation pattern is formed in high frequency band (7GHz, 10GHz), and the level is reduced around 270 ° due to the influence of ground plane.

Also, as shown in FIG. 5C, xy-plane

Figure 112010076003540-pat00003
In the low frequency band, the characteristics of monopole antenna appeared, and as the frequency increased, the radiation pattern having a large number of nulls due to the harmonic component was formed.

And, as shown in (d) of FIG. 5, the simulation result and the measurement result are shown by the maximum gain for each frequency within the operating frequency, and the gain increases because the antenna is electrically increased as the frequency increases. . In addition, the measured average efficiency is 98.2%.

In summary, we designed a planar broadband antenna that combines a printed folded monopole antenna element and an inverted L-type non-powered element. The designed antenna radiating element is 13.75 (0.11λ) mm × 12 (0.9λ) mm and shows -10dB bandwidth characteristic of 4.85: 1 (2.27 ~ 11GHz) bandwidth. Radiation pattern is zx-plane at low frequency

Figure 112010076003540-pat00004
This omni-directional characteristic is shown, and zy-plane at high frequency
Figure 112010076003540-pat00005
Since this omnidirectional radiation pattern was formed, it was confirmed that the planar broadband antenna combined with the designed reverse L-type non-powered element is useful for the proposed antenna.

On the other hand, it will be described with respect to the planar broadband antenna according to a modification of the planar broadband antenna (A) described above.

FIG. 6 is a structural diagram of an antenna according to a first modified example of the present invention. As shown in FIG. 6A, the antenna has the same configuration as that of the flat broadband antenna A, and the radiating elements are the same. The size of the ground plane was extended to 300 (2.3λ) mm × 200 (1.54λ).

Accordingly, as shown in (b) of FIG. 6, the -10 dB bandwidth characteristic of the 4.93: 1 (2.15 to 10.6 GHz) bandwidth was shown.

7 is a structural diagram of an antenna according to a second modified example of the present invention, which has the same configuration as the planar broadband antenna A, but reduces the size of the circuit board, the ground plane, and the radiating element.

At this time, as shown in (a) of FIG. 7, a portion of the upper end of the ground plane is cut and deformed to have a yaw groove shape. That is, by deforming the ground plane, it has a band extension effect as shown in FIG.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be appreciated by those skilled in the art that numerous changes and modifications may be made without departing from the invention. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

100: substrate 200: ground plane
300: radiating element 310: printed folded monopole antenna element
311: feed line 312: short circuit
320: reverse L-shaped non-powered element

Claims (9)

In the planar broadband antenna,
A substrate having a predetermined dielectric constant;
A ground plane formed at a lower end of the substrate and formed on both sides including a front side and a rear side; And
A radiating element connected to the coaxial cable of the ground plane and including a printed folded monopole antenna element and an inverted L-shaped non-powered element; Including,
The printed folded monopole antenna element,
A feed line extending vertically upward from a feed portion, and a short line extending in a 'b' shape from an upper end of the feed line and connected to a ground plane;
The reverse L-shaped non-powered element,
And an inverted L-shape extending from the ground plane so as to surround the right side of the printed folded monopole antenna element.
The method of claim 1,
And the width of the feed line is greater than the width of the short line.
The method of claim 1,
The radiating element in which the printed folded monopole antenna element and the inverted L-shaped non-powered element are coupled to each other, is a planar broadband antenna characterized in that impedance matching is performed in a low frequency band by adjusting the length (L) of the inverted L-shaped non-powered element. .
The method of claim 1,
And the impedance matching is changed in a high frequency band by mutual impedance according to the horizontal gap (S) adjustment between the inverted L-shaped non-powered element and the printed folded monopole antenna element.
delete The method of claim 1,
The ground plane,
A flat broadband antenna, characterized in that the upper portion is cut in the form of a yaw groove.
delete delete delete
KR1020100116036A 2010-11-22 2010-11-22 Planar type wideband antenna KR101138247B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102453142B1 (en) * 2022-02-10 2022-10-07 박영권 Monopole antenna

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080037465A (en) * 2006-10-26 2008-04-30 엘에스산전 주식회사 Apparatus and methoed for
KR20090031969A (en) * 2007-09-26 2009-03-31 미쓰미덴기가부시기가이샤 Antenna element and wideband antenna device
KR20090039910A (en) * 2007-10-19 2009-04-23 한양대학교 산학협력단 Ultra wide band monopole internal antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080037465A (en) * 2006-10-26 2008-04-30 엘에스산전 주식회사 Apparatus and methoed for
KR20090031969A (en) * 2007-09-26 2009-03-31 미쓰미덴기가부시기가이샤 Antenna element and wideband antenna device
KR20090039910A (en) * 2007-10-19 2009-04-23 한양대학교 산학협력단 Ultra wide band monopole internal antenna

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102453142B1 (en) * 2022-02-10 2022-10-07 박영권 Monopole antenna

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