KR20120129295A - Reverse Triangle Antenna for Ultra Wide Band Communications - Google Patents

Abstract

PURPOSE: A reverse triangle antenna for ultra wide band communications is provided to interrupt the WLAN band by inserting a slot of simple structure into the patch radiator. CONSTITUTION: A patch radiator(13) of reverse triangle transceives a signal on rectangular dielectric substrate(11) of rectangular shape. The first and second ground plane(15a, 15b) have trapezoidal shapes. Both sides of a feeding line(17) are separated from the first and second ground planes to perform the power feed about the patch radiator. The first and second ground planes comprise the top side, the lower side, and the outer inclined plane and the inner inclined surface.

Description

Reverse Triangle Antenna for Ultra Wide Band Communications

The present invention relates to an inverted triangular ultra-wideband antenna for ultra-wideband communication, and more particularly, to extend the bandwidth by providing inclined planes with easy property control on both sides of the ground plane for use in the operating band of the UWB communication system. The present invention relates to an inverted triangular ultra wideband antenna for ultra wideband communication, which can insert a relatively simple slot into a patch to block a WLAN band.

The Ultra Wide Band (UWB) communications system was introduced in February 2002 by the US Federal Communications Commission (FCC), which banned the UWB (Ultra Wide Band) from civilian use. Commercialization is possible.

Ultra-wideband (UWB) communication systems are defined as `` wireless transmission technologies that occupy more than 20% of the central frequency. In general, it is defined as short-range wireless communication that has a transmission speed of 100 Mbps or more in the 3.1 GHz to 10.6 GHz band and performs high speed communication at low power.

Ultra-wideband (UWB) communication systems require broadband antennas from 3.1 GHz to 10.6 GHz to meet these requirements, and require a small antenna because the wavelength is about 28 to 96 mm.

UWB's main applications include personal computing, which is a data exchange between consumer electronics, a consumer electronics / broadcasting system that requires high-capacity, high-speed transmission, and peripherals for computer / internet operations. In addition, high-speed video transmission between a mobile multimedia using a mobile multimedia device such as PDP / PMP and a communication device / video device, and Wireless USB. As UWB is used in various fields, researches on planar monopole and dipole antennas for UWB communication systems have been actively conducted.

Antennas used in UWB communication systems must satisfy conditions such as broadband impedance matching, constant radiation pattern, constant group delay, and small size. To this end, use thick conductors, multiple resonances, or the principle of a self-similar structure, a self-compensation structure, or use a resonant characteristic represented by an angle rather than an antenna length. In addition, it should not cause interference with other wireless systems such as WiMax and Wireless Lan IEEE 802.11a / n.

Bow-tie antenna is a planar type of twin-cone antenna that progressively thickens the conductor diameter to increase the bandwidth of the dipole antenna. It is used for the entire UWB band because current has a limited bandwidth by suddenly terminating at the end of the pin. Not satisfactory below. In addition, existing papers on PTMA (Planar Triangle Monopole Antenna) have limited bandwidth and do not operate in the entire UWB band.

See "The tab monopole" (IEEE Trans.Antennas Propag., Vol. 45, no. 1, pp. 187-188, Jan. 1997, published by JM Johnson and Y. Rahmat-Samii as a conventional ultra-wideband antenna). The antenna consists of a tapered radiating element on a flat ground plane structure and the feeder is composed of CPW. The UWB system should satisfy -10 dB in the 3.1 GHz to 10.6 GHz band, but the prior art satisfies the -10 dB in the 1.8 GHz to 3.5 GHz and thus cannot be used in the UWB system due to the narrow bandwidth.

In addition, although papers using CSRRs (Complementary split ring resonators) have been recently published for the prevention of 802.11a / n WLAN and WiMax frequency band, the antenna design has been complicated.

Korean Patent Laid-Open Publication No. 2006-28953 has a trapezoidal patch, matching stub, CPW feeding method, and a rectangular slot, so that it has a small size, light weight, low cost broadband characteristics, and a notch characteristic in a 5 GHz WLAN band (5.15-5.35 GHz). An ultra-wideband antenna is proposed.

In addition, Korean Patent Laid-Open Publication No. 2006-117161 discloses a semicircular patch surface for transmitting or receiving a signal, a matching stub for impedance matching located at an upper side of the patch surface, a coplanar waveguide part ground for grounding, and a connection with a patch surface. To provide a coplanar waveguide (CPW) feed line for power feeding.

Patent Publication No. 2005-114964 has a rectangular patch and a signal line for inputting and outputting signals; A matching stub for matching the patch with a signal line and a ground electrode formed on the left and right sides of the signal line have been proposed for a CPW feeding type ultra wide band patch antenna.

Korean Patent Laid-Open Publication No. 2005-120442 discloses a feeder line printed on a substrate in a straight line, a circular or elliptical radiation element formed at an end of the feeder line, and the radiation element is curved toward the feeder line on both sides or the rear of the radiation element and the feeder line. Consists of a ground plane formed to taper into a shape, and by changing the impedance gradually, the ratio of the lower limit frequency to the upper limit frequency has an ultra-wideband characteristic of 30: 1 or more, and a modified omnidirectional conical beam radiation pattern similar to that of a general monopole antenna. An ultra wide band printed monopole antenna using a ground plane is proposed.

The above-mentioned patent discloses impedance matching using a matching stub (or matching stub), and uses a square, circular or elliptical patch, and thus it is not easy to form a precise pattern for implementing antenna characteristics, and it is difficult to miniaturize. have.

Accordingly, the present invention provides an inverted triangular ultra-wideband antenna for ultra-wideband communication by widening the bandwidth by giving inclined planes with easy characteristics control on both sides of the ground plane so that they can be used in the operating band of the UWB communication system, from 3.1 GHz to 10.6 GHz. have.

Another object of the present invention is to provide an inverted triangular ultra-wideband antenna for ultra-wideband communication that can block WLAN band by inserting slots of a relatively simple form into the radiation patch to simplify the design process of the antenna.

It is still another object of the present invention to provide an inverted triangular ultra-wideband antenna for ultra-wideband communication that can be manufactured in a small size while satisfying the ultra-wideband frequency band by using a magnetic field wall with a radial patch and a ground plane symmetrically structured. .

In order to achieve the above object, the present invention is a rectangular dielectric substrate; An inverted triangular radiation patch formed on one surface of the dielectric substrate and configured to transmit / receive a signal; First and second ground planes each having a trapezoidal area and a rectangular area in a combined shape and spaced apart from each other; And a poplarner waveguide (CPW) feed line formed at both sides of the first and second ground planes at intervals from the rectangular areas of the first and second ground planes to feed the radiating patch, wherein the first and second ground planes are each trapezoidal. The first inclination angle formed between the outer inclined surface and the lower side of the region, the second inclination angle formed between the inner inclined surface and the lower side, and the height between the lower side and the upper side are adjusted to set the bandwidth of the antenna, An ultra-wide band antenna is provided, which performs impedance matching between feed lines.

The ultra-wideband antenna according to the present invention may further include an inverted T-shaped band blocking slot inserted into the inverted triangular radiation patch to block the WLAN band.

The band blocking slot may include a linear vertical slot formed vertically from an upper end of an inverted triangular radial patch, and a horizontal slot extending right and left from a lower end of the vertical slot.

In addition, as the length of the horizontal slot decreases in the band blocking slot, the stop bandwidth decreases. As the length of the vertical slot increases, the stop bandwidth increases, and as the length of the vertical slot decreases, the stop bandwidth decreases and at the same time the stop frequency. Becomes higher.

In this case, the thickness of the band blocking slot may be set to 1.0mm, the length of the horizontal slot is 16.9mm, the length of the vertical slot is 4.9mm.

According to another feature of the invention, the present invention is a rectangular dielectric substrate; An inverted triangular radiation patch formed on one surface of the dielectric substrate and configured to transmit / receive a signal; First and second ground planes each formed in a trapezoidal shape and spaced apart from each other; And a poplarner waveguide (CPW) feed line formed at both sides with a gap from the first and second ground planes to feed the radiating patch, wherein the first and second ground planes are each trapezoidally shaped. The first inclination angle formed between the inclined surface and the lower side, the second inclination angle formed between the parallel side of the inner inclined surface and the lower side, and the height between the lower side and the upper side are adjusted to set the bandwidth of the antenna and at the same time between the radiation patch and the feed line. It provides an ultra-wideband antenna, characterized in that for performing impedance matching.

Each of the first and second ground planes has an inner inclined surface disposed at a portion opposite to the inclined surface of the inverted triangular radial patch, and the feed line forms a co-polo or waveguide (CPW) structure at a portion where the inner inclined surface and the lower side meet. It is preferable that the vertical surface parallel to the feed line is provided.

In addition, the antenna is preferably provided with a right-angled triangular radiation patch cut into a vertical cut centered on the symmetrical plane of the y-z plane constituting the complete magnetic field wall, one side as an open surface.

In addition, it is preferable that the substrate is left so that the feed line is not directly exposed to the open surface half cut along the complete magnetic field wall.

Furthermore, the height of the inverted triangular radiation patch is preferably set corresponding to the λ / 4 length of the lowest frequency of the operating band.

As described above, in the present invention, the inclined planes are provided on both sides of the ground plane to widen the bandwidth so that they can be used at 3.1 GHz to 10.6 GHz, which are operating bands of the UWB communication system.

In addition, in the present invention, slots of a relatively simple shape are inserted into the patch surface in order to simplify the design process of the antenna, thereby preventing the WLAN band.

Furthermore, in the present invention, the radiation patch and the ground plane have a symmetrical structure, and can be manufactured in a small size while satisfying the ultra wide band of frequency bands by using a magnetic field wall.

The inverted triangular ultra-wideband antenna of the present invention can be mounted on a PCB to facilitate mass production, reduce the overall system size and make the antenna invisible in appearance.

In addition, the present invention can be used in the operating band of 3.1 GHz ~ 10.6 GHz of the UWB communication system, exhibits an omnidirectional radiation pattern in all operating bands and has a gain of -5 dBi or more. It is easy to design a system with a wide bandwidth or a system using multiple bands together.

1 is a plan view showing an ultra-wideband antenna having an inverted triangle radiation patch according to a first embodiment of the present invention,
FIG. 2 is an enlarged view of the feeder line part of FIG. 1;
3 is a real picture of an ultra-wideband antenna according to a first embodiment of the present invention,
4 is a graph showing the reflection loss of the ultra-wideband antenna according to the change of the inclination angle α of the ground plane in the first embodiment of the present invention;
FIG. 5 is a graph illustrating a simulation of an ultra-wideband antenna according to a first embodiment of the present invention and comparison of reflection loss with respect to the real object; FIG.
6 is a configuration diagram showing a method of measuring gain of an antenna;
7A to 7F illustrate radiation patterns of an XY-plane and an XZ-plane at 3 GHz, 4 GHz, and 5 GHz of the ultra-wideband antenna according to the first embodiment of the present invention.
8 is a diagram showing magnetic field distribution in the xz-plane and the yz-plane of an ultra-wideband antenna having an inverted triangular radiation patch according to the first embodiment of the present invention;
9 is a diagram showing a magnetic field distribution diagram as an ultra-wideband antenna in which the antenna of the first embodiment is reduced to 1/2 by using a magnetic field wall according to a second embodiment of the present invention;
10 is a graph showing the reflection loss of the ultra-wideband antenna according to the second embodiment of the present invention in comparison with the first embodiment,
11 is a plan view showing an ultra-wideband antenna having an inverted triangle radiation patch according to a third embodiment of the present invention;
12 is a partially enlarged view of FIG. 11;
FIG. 13A is a graph illustrating return loss of an ultra-wideband antenna according to a change in an inclination angle α in the third embodiment of the present invention; FIG.
FIG. 13B is a graph showing the reflection loss of the ultra-wideband antenna according to the change of the inclination angle β in the third embodiment of the present invention;
FIG. 13C is a graph showing the reflection loss of the ultra-wideband antenna according to the change of Hg in the third embodiment of the present invention; FIG.
14 is a plan view showing an ultra-wideband antenna having an inverted triangular radiation patch with a band blocking slot according to a fourth embodiment of the present invention;
15 is a graph illustrating return loss of an ultra-wideband antenna according to a change in Ws in the fourth embodiment of the present invention;
16 is a graph showing the return loss of the ultra-wideband antenna according to the change of Hs in the fourth embodiment of the present invention;
17 is a real comparison picture of the ultra-wideband antenna according to the third and fourth embodiments of the present invention;
FIG. 18 is a graph illustrating a simulation of an ultra-wideband antenna according to a third embodiment of the present invention and comparison of reflection loss with respect to the real;
FIG. 19 is a graph illustrating simulation of an ultra-wideband antenna according to a fourth exemplary embodiment of the present invention and comparison of return loss with respect to the real;
20A to 20H are graphs illustrating radiation patterns of antennas measured and measured for XZ-plane and XY-plane at 3.1 GHz, 5.5 GHz, 8.4 GHz, and 10.6 GHz, respectively.
FIG. 21 is a graph illustrating group delay characteristics of an ultra-wideband antenna according to a fourth embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, It can be easily carried out.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

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

1. First Embodiment

1 is a plan view showing an ultra-wideband antenna having an inverted triangular radiation patch according to a first embodiment of the present invention, Figure 2 is an enlarged view of the feeder line portion of FIG.

A. Antenna Structure

1 and 2, the ultra-wideband antenna 10 according to the first embodiment of the present invention, the reverse triangular radiation for transmitting and receiving signals on one surface of the rectangular dielectric substrate 11 The patches 13, each of which has a trapezoidal shape and are spaced apart from each other, have first and second ground planes 15a and 15b disposed on both sides, and both sides have a predetermined distance from the first and second ground planes 15a and 15b. It has a structure in which the feed line 17, which is fed to the spinning patch 13 is mounted.

The first and second ground planes 15a and 15b include an upper side 151, a lower side 152, an outer inclined surface 153, and an inner inclined surface 154, respectively. In addition, the first and second ground planes 15a and 15b have inner inclined surfaces 154 disposed on portions opposite to the inclined surface 131 of the inverted triangular radiation patch 13, respectively, and the inner inclined surfaces 154. At the portion where the lower side 152 meets, the feed line 17 is provided with a vertical surface 155 parallel to the feed line 17 so as to form a coplanar waveguide (CPW) structure. A gap Gap of the same width is formed between the vertical plane 155 of the two ground planes 15a and 15b and the feed line 17.

In the first embodiment of the present invention, the first and second ground planes 15a and 15b are formed with the first inclination angle α formed between the outer inclined surface 153 and the lower side 152 and the inner inclined surface 154 and the lower side. The trapezoidal shape may be defined by a second inclination angle β formed between parallel lines of the sides 152, which affects the characteristics of the radiation patch 13 and thus affects the band extension of the antenna as described below. Crazy

In addition, feeding of the antenna uses a coplanar waveguide (CPW) structure in which the radiation patch 13 and the first and second ground planes 15a and 15b coexist on one plane of the substrate 11, and the CPW feedline 17 The impedance of) is designed as 53Ω in all frequency bands, and the height (H _Patch ) of the inverted triangle radiation patch 13 corresponds to the λ / 4 length of the lowest frequency of 3.1GHz within the operating band of 3.1GHz to 10.6GHz. Adjusted.

The antenna 10 according to the first embodiment of the present invention has a dielectric constant of 6.15, a substrate thickness of 0.64mm, a conductor thickness forming the radiation patch 13 and the first and second ground planes 15a and 15b. Taconic's RF-60A with 0.035 and 0.0025 loss tangent was used. The overall size is 64 (W) × 34 (H) mm ² and the setting values for each parameter are shown in Table 1 below.

In FIG. 1 and FIG. 2, reference numeral W _Patch denotes the width of the radiation patch 13, W _Feed denotes the width of the feed line 17, and H _Feed denotes the length of the feed line.

parameter Setting value parameter Setting value W 64.0mm W _GND 51.6 mm H 34.0mm H _GND 9.0mm W _Patch 58.0 mm W _feed 1.3 mm H _Patch 31.0mm H _feed 1.8mm alpha 48.0 ° γ 8.0mm β 38.5 ° Gap 0.3mm

The antenna design uses Ansoft's HFSS as a simulation tool.

FIG. 4 shows the return loss values simulated by fixing all parameters in Table 1 and changing only the first inclination angle α. The characteristics of the overall antenna change according to the first inclination angle α. When the first inclination angle α becomes larger by 48 °, the characteristics of the high frequency band become worse, and when the first inclination angle α becomes smaller, the characteristics of the low frequency band become worse. Therefore, it can be seen that the optimum return loss is around 48 °. However, this result is fixed with other parameters, and it is found that if the second inclination angle β is changed or the length of the upper side 151 (γ) is changed, it has an optimal reflection loss when the first inclination angle α is 48 °. It is not guaranteed and changes in the high frequency band and the low frequency band based on the 48 ° shown in FIG. 4 are unpredictable.

Further, α, β, and γ have bands in which return loss characteristics deteriorate with a change in a set value. In the case of α, since the return loss characteristic of 4.5 to 6.5 GHz deteriorates as the set value becomes smaller, it is preferable to set it in the range of 45 to 51 °. In the case of β, since the return loss characteristics deteriorate in the band of 6 GHz or more when the set value is small, it is preferable to set it in the range of 33 to 40 degrees. In the case of gamma, since it depends on the set values of α and β, it is determined by the set values of α and β, and is preferably set in the range of 7 to 9 mm.

As the ground plane height (H _GND ) becomes larger, the return loss characteristic of the low frequency band (~ 6 GHz) becomes worse overall, and as the set value becomes smaller, the return loss characteristic of the high frequency band (~ 6 GHz) worsens overall, and 8.7 to 9.5 It is preferably set in the mm range.

As the ground plane width (W _GND ) is increased, the return loss characteristic of the high frequency band (6GHz ~) is bad as a whole, and when the setting value is smaller, the reflection loss characteristic of the low frequency band (~ 6GHz) is bad as a whole, and 50 ~ 54mm It is preferable to set the range.

The gap (Gap) determines the impedance of the patch feed line (line part), so if it changes, the overall impedance change appears. The smaller the value, the lower the impedance of the feeder line (line part), and the larger the value, the larger the impedance of the feeder line, it is preferably set in the range of 0.2 ~ 0.5mm.

B. Antenna Fabrication and Measurement

Figure 3 shows a real picture of the sampled antenna. The return loss and radiation pattern of the fabricated antenna were measured in an electromagnetic anechoic chamber using Anritsu's Vector Network Analyzer 37397C.

FIG. 5 compares the results of using Ansoft's HFSS as a simulation tool and the measurement of the return loss of the real antenna shown in FIG. 3. The return loss is less than -10 dB in the frequency band 3.1 GHz to 10.6 GHz used in the UWB system. Satisfaction is shown and the simulation results (dotted line) and the sample (solid line) measurements are similar.

6 shows an antenna gain measurement method using a gain comparison method. After connecting a standard antenna having a gain to a transmitting end TX through an amplifier AMP, and a measuring antenna to be measured without knowing the gain to a receiving end RX, the network Received power was measured with a network analyzer. The gain of the antenna to be measured is calculated by multiplying the ratio of the received power by the standard antenna gain.

7A to 7F are radiation patterns measured by using the gain comparison method described above in the electromagnetic anechoic chamber. The radiation pattern shown shows radiation patterns of XY-plane and XZ-plane at 3, 4, and 5 GHz, gains of -5 dB or more, and the radiation pattern of the monopole antenna.

Antenna 10 according to the first embodiment of the present invention is an inverted triangle monopole UWB antenna, the size of the antenna is 64 × 34mm ² , the proposed antenna satisfies the UWB band 3.1GHz ~ 10.6GHz, the return loss ( Return Loss) is less than -10dB.

In addition, it can be seen that the overall antenna characteristics can be changed by providing the outer inclined surface 153 and the inner inclined surface 154 to the first and second ground planes 15a and 15b. Got.

2. Second Embodiment

Among the miniaturization methods of the antenna, the characteristics of the complete electric field wall or the full magnetic field wall can be used. Both of them use the electromagnetic symmetry plane and the electromagnetic properties of the plane instead of simply using the physical symmetry plane.

The present invention designs an ultra-wideband antenna having a symmetrical inverted triangular radiation patch that causes multiple resonances, and analyzes the resonance mode and the electromagnetic field pattern for each mode to derive the complete magnetic field wall in the symmetrical plane in the vertical direction. Miniaturize broadband antennas. That is, since the left and right symmetrical surfaces of the inverted triangular radiation patch of the ultra-wideband antenna form a complete magnetic field wall, the triangular patch can be formed by cutting the surface about one side and making one side open.

By using this, when a right triangle patch is formed with the full magnetic field wall as an open surface, a half radiating patch is formed, thereby miniaturizing an ultra-wideband antenna. That is, one full magnetic field wall can be derived from the inverted triangular ultra-wideband antenna, and a rectangular triangular ultra-wideband antenna can be fabricated by minimizing to 1/2 by applying one magnetic field wall.

8 is a diagram showing magnetic field distributions in the xz-plane and the yz-plane of an ultra-wideband antenna having an inverted triangular radiation patch according to the first embodiment of the present invention, and FIG. 9 is a second embodiment of the present invention. 10 is a plan view and a magnetic field distribution diagram showing an ultra-wideband antenna in which the antenna of the first embodiment is reduced to 1/2 by using a magnetic field wall, and FIG. 10 shows the reflection loss of the ultra-wideband antenna according to the second embodiment of the present invention. It is a graph compared with.

FIG. 8 shows the magnetic field distribution in the xz and yz planes of the antenna of the first embodiment of the present invention. Since the magnetic field distributions are all perpendicular to the yz plane, this plane is a perfect magnetic wall. PMW).

In the case of a complete magnetic field wall, the following Equations 1 to 4 must be satisfied.

Where D is the flux density, B is the magnetic flux density, E is the electric field, H is the magnetic field, and n is the vector value of the vertical component.

In the aforementioned inverted triangular ultra-wideband antenna, a magnetic field (H-field) is generated in a direction perpendicular to the yz plane, and an electric field (E-field) is generated in a tangential direction in the yz plane, satisfying Equations 3 and 4, and the yz plane The structure of the antenna and the symmetry of the medium are fully symmetrical, so that the flux density (D), the flux density (B), and the vector value (n) of the vertical component are not changed at the interface, so that Equations 1 and 2 are also satisfied.

As described above, since the inverted triangular ultra-wideband antenna of the first embodiment satisfies Equations 1 to 4, it can be seen that the y-z plane forms a complete magnetic field wall. Therefore, it is possible to manufacture a right-angled triangular ultra-wideband antenna cut vertically with respect to the symmetrical plane of the y-z plane constituting the complete magnetic field wall and cut vertically with one side open.

The perfect magnetic field wall is a dual relationship with the perfect electric field wall, and if the surface of the perfect magnetic field wall is replaced by an open surface, as shown in FIG. 9, a miniaturized ultra wide band antenna having a size of 1/2 having a right triangle is formed.

Therefore, the ultra-wideband antenna 10a according to the second embodiment of the present invention has a rectangular triangular radiation patch 13a for transmitting / receiving a signal on a substantially square dielectric substrate 11a, a trapezoidal shape, and an interval therebetween. The first ground plane (15a) disposed on the side and one side of the first ground plane (15a) at a predetermined distance from the feed line for feeding the feed to the radiating patch (13a) is formed, the feed line is a coaxial connector A core of 19 is connected, and a ground line of the coaxial connector 19 is connected to the first ground plane 15a.

In addition, when miniaturizing the half of the rectangular triangular ultra-wideband antenna to half along the magnetic field wall, the vertically cut rectangular triangular ultra-wideband antenna has the feed line 17 exposed to the outside, so that the impedance of the antenna The value will change. Therefore, in order to solve the problem that the feed line 17 is in direct contact with the open surface, the substrate 11a is left. That is, it can be seen that the substrate 11a is left so that the feed line 17 is not directly exposed to the open surface halved along the complete magnetic field wall.

FIG. 10 is a graph showing the reflection loss (solid line) of the ultra-wideband antenna according to the second embodiment of the present invention in comparison with the reflection loss (dotted line) of the first embodiment, and shows similar characteristics to each other. According to the ultra-wideband antenna, the impedance may be increased, but the overall characteristics may be maintained.

As described above, the antenna of the first embodiment of the present invention has a symmetrical structure, so that the size can be reduced in half by using magnetic field wall conditions.

3. Third Embodiment

FIG. 11 is a plan view illustrating an ultra-wideband antenna having an inverted triangular radiation patch according to a third embodiment of the present invention. FIG. 12 is a partially enlarged view of FIG. 11 and FIG. 13A is an inclination angle α in the third embodiment of the present invention. Figure 13b is a graph showing the reflection loss of the ultra-wideband antenna according to the change of Fig. 13b is a graph showing the reflection loss of the ultra-wideband antenna according to the change of the inclination angle β in the third embodiment of the present invention, Figure 13c In the third embodiment, it is a graph showing the reflection loss of the ultra-wideband antenna according to the change of Hg.

11 and 12, an ultra-wideband antenna 10b having an inverted triangular radiation patch according to a third embodiment of the present invention is similar to the first embodiment, and has a surface of a rectangular dielectric substrate 11b. In addition, the first and the second inverted triangular radiation patch 13b for transmitting / receiving a signal, the trapezoidal regions 250a and 250b and the rectangular regions 252a and 252b, respectively, are arranged at intervals. The second ground plane 15c and 15d, and both sides of the feed to the radiation patch 13b at a predetermined distance from the rectangular areas 252a and 252b of the first and second ground planes 15c and 15d, respectively. The feeder line 17b formed has the structure mounted.

Compared to the first embodiment, the inverted triangle monopole UWB antenna 10b according to the third embodiment of the present invention has the width W of the substrate 11b reduced and the height H increased in width and length. The ratio is changed, the radiation patch 13b has the width W and the height H reduced to 2/3 size, respectively, and the first and second ground planes 15c and 15d are symmetrical with the feed line 17b. The rectangular regions 252a and 252b were formed in the trapezoidal regions 250a and 250b, respectively, in response to the increase of the length from 1.8mm to 20mm.

In addition, the trapezoidal regions 250a and 250b of the first and second ground planes 15c and 15d are respectively formed with a first inclination angle α formed between the outer inclined plane and the lower side, and a first inclined plane formed between the inner inclined plane and the lower side. It can be defined by the two inclination angle β and the height Hg between the lower side and the upper side.

When the power feeding method is composed of CPW, the antenna is relatively simple to manufacture and has an advantage of obtaining a wideband impedance bandwidth due to its structural characteristics.

In order to check the characteristics of the inverted triangular monopole UWB antenna 10b according to the third embodiment of the present invention described above, the simulation was performed and the characteristics were examined.

Taconic's RF-60A substrate with a relative dielectric constant of 6.15, dielectric thickness of 0.64mm, conductor thickness of 0.035mm, and loss tangent of 0.0025 was used.The overall size is 50.0 (W) mm × 43.7 (H) mm, and the value for each parameter is It is shown in Table 2 below. The power feeding of the antenna is CPW feeding method and 50Ω transmission line is constructed by using the characteristic impedance calculation formula of CPW structure.

variable Length (mm) variable Length (mm) variable value W 50.0 W _f 2.0 alpha 41.4 ° H 43.7 H _f 20.0 β 41.4 ° W _p 36.0 g _p 0.4 H _g 8.4mm H _p 19.5 g _f 0.2 - -

As shown in Figs. 13A to 13C, the return loss characteristic is greatly changed according to the inclination angles of α and β and the change in the length of Hg, and the simulation is simulated using Ansoft's High Frequency Structure Simulator (HFSS). .

Referring to FIG. 13A, which shows the change in the reflection loss characteristic according to the inclination angle α value, as the inclination angle α value increases, the reflection loss characteristic of the band below 6 GHz is worsened and the reflection loss is improved in the band 6 GHz and above. As the value decreases, the return loss characteristic of the band above 6GHz is improved.

Referring to FIG. 13B showing the change in the reflection loss characteristic according to the inclination angle (β) value, as the value of the inclination angle (β) decreases, the reflection loss is improved in the band of 6 GHz or more, and the reflection loss of the entire band at the inclination angle (β) value near 45 °. This gets better.

Referring to FIG. 13C illustrating the change in return loss characteristic according to the H _g value, as the H _g increases, the characteristics of the band below 6 GHz deteriorate and the band above 8 GHz deteriorates. In addition, even if H _g decreases, the characteristic does not improve, and therefore, it can be seen that there is an optimized value in the H _g value between the maximum value and the minimum value, that is, in the range of 7.5 mm to 8.5 mm.

In addition, g _p is a variable that determines the spacing between the radiating patch and the ground plane. By simply optimizing the values of α, β, and H _g and simulating, if g _p is less than 2mm, the return loss is -10dB in the band above 8GHz. If the value of 2mm is not satisfied, the return loss does not satisfy -10 dB in the band of 4GHz to 8GHz.

In the present invention, since the inclination angle (α), the inclination angle (β), and H _g of the ground plane are adjusted to focus on broadband impedance matching, the g _p value is appropriately set to the value shown in Table 2 and other parameters are appropriately set for such a situation. Optimized by simulation.

Sample characteristic inspection of the inverted triangular monopole UWB antenna 10b according to the third embodiment of the present invention is carried out together with the description of the fourth embodiment to be described later.

14 is a plan view showing an ultra-wideband antenna having an inverted triangular radiation patch with a band blocking slot according to a fourth embodiment of the present invention, Figure 15 is an ultra-wideband according to the change of Ws in a fourth embodiment of the present invention 16 is a graph showing the reflection loss of the antenna, Figure 16 is a graph showing the reflection loss of the ultra-wideband antenna according to the change of Hs in the fourth embodiment of the present invention.

The ultra-wideband antenna 10c according to the fourth embodiment of the present invention relates to a monopole UWB antenna having an inverted triangular radiation patch 13c to which a band stop slot 20 is added. The remaining structure is different from that of the third embodiment. same.

That is, the ultra-wideband antenna 10b according to the fourth embodiment of the present invention, similar to the third embodiment, has an inverted triangle radiation patch for transmitting / receiving a signal to one surface of the rectangular dielectric substrate 11b. 13c, the trapezoidal regions 250a and 250b and the rectangular regions 252a and 252b are formed in a combined shape, respectively, and the first and second ground planes 15c and 15d, which are spaced apart from each other, and both side surfaces thereof. The feed line 17b, which feeds power to the radiation patch 13b at predetermined intervals from the rectangular areas 252a and 252b of the first and second ground planes 15c and 15d, is mounted, and has an inverted triangle shape. An inverted T-shaped bandstop slot 20 is inserted in the radiation patch 13c to block the WLAN band.

The band stop slot 20 is a linear vertical slot 20a vertically formed from an upper end of an inverted triangular radial patch 13c and a horizontal slot 20b extending from right to left at right angles from a lower end of the vertical slot 20a. )

In the fourth embodiment of the present invention, as shown in FIG. 14, the band stop slot 20 added to the prototype of the third embodiment applies the concept of a slot line resonator, and the length of the resonator is an inverse T-shaped band stop. When the slot 20 is equal to the length Ws of the horizontal slot 20b and the resonant frequency f ₀ is 5.5 GHz and the thickness of the slot is 0.7 mm, the length of Ws is calculated to be about 19 mm using the well-known equation. .

However, as shown in FIG. 15, when Ws is 19 mm, the stop bandwidth is wider than 5.15 GHz to 5.825 GHz, which is a desired band, and as the W s decreases, the stop bandwidth is reduced. Through simulation, we find and apply an optimal value that blocks only WLAN bands with higher stop frequencies. In addition, as shown in FIG. 16, as the length Hs of the vertical slot 20a in the bandstop slot 20 increases, the stop bandwidth increases, and as the decrease decreases, the stop bandwidth decreases and the stop frequency increases. In consideration of the above, the thickness of the band stop slot is optimized to 1.0 mm, Ws to 16.9 mm, and Hs to 4.9 mm.

17 is a real comparison picture of the ultra-wideband antenna according to the third and fourth exemplary embodiments of the present invention, and FIG. 18 is a simulation of the ultra-wideband antenna according to the third exemplary embodiment of the present invention and the reflection loss of the real 19 is a graph illustrating a simulation of the ultra-wideband antenna according to the fourth embodiment of the present invention and reflection loss in real life, and FIGS. 20A to 20H are respectively at 3.1 GHz, 5.5 GHz, 8.4 GHz, and 10.6 GHz. FIG. 21 is a graph showing the group delay characteristics of the ultra-wideband antenna according to the fourth embodiment of the present invention.

In the photograph of FIG. 17, the left side is a real photo of the ultra wide band antenna according to the third embodiment, and the right side is a real photo of the ultra wide band antenna according to the fourth embodiment. The overall size of the fabricated antenna is 50.0 (W) mm × 43.7 (H) mm in both types. The return loss and radiation pattern of the antenna were measured in an electromagnetic anechoic chamber using Anritsu's Vector Network Analyzer 37397C.

As shown in FIG. 18, the measurement results of the real antenna according to the third exemplary embodiment (solid line) showed a return loss of less than -10 dB at 3.1 to 10.6 GHz, which is similar to the simulation result (dotted line). .

In addition, as a result of measuring characteristics of the real antenna with a slot according to the fourth embodiment manufactured as shown in FIG. This is similar to the simulation result (dotted line).

20A to 20H show the results of the simulation and the radiation pattern of the measured antennas at 3.1 GHz, 5.5 GHz, 8.4 GHz, and 10.6 GHz for the XZ-plane and the XY-plane, respectively. 20A to 20H,? Denotes a simulation according to the third embodiment,? Denotes a real antenna according to the third embodiment, ■ denotes a simulation according to the fourth embodiment, and ▲ denotes a radiation pattern of the physical antenna according to the fourth embodiment. Respectively.

It can be seen that the fourth embodiment structure in which the jersey slot is added has a lower gain than that of the third embodiment structure at 5.5 GHz. In addition, the proposed antenna according to the fourth embodiment is similar to the radiation pattern of the omnidirectional antenna because it is an extension of the monopole antenna. The measurement results have the maximum gain of 2.4dB ~ 5.3dB in all bands and the average gain and the maximum gain for each frequency are shown in Table 3 below.

frequency 3.1 GHz 5.5 GHz 8.4 GHz 10.6 GHz Average gain -0.3 dB -5.8 dB -6.7 dB -1.5 dB Maximum gain 2.4 dB 0.3 dB 2.4 dB 5.3 dB

FIG. 21 is a graph illustrating group delay characteristics of an ultra-wideband antenna according to a fourth embodiment of the present invention, measured using a double-ridged horn antenna (MTG-drh-020180) as a transmission reference antenna. . The measurement results show that the group delay is within 1 ns for the entire UWB band except for the WLAN band (5.15 to 5.825 GHz).

As described above, in the present invention, the insufficient bandwidth is increased by providing outer and inner inclined planes to the first and second ground planes disposed on both sides in the inverted triangle monopole type antenna, and a band stop slot is added to the radiation patch. To block the WLAN band.

In the antenna of the present invention, the impedance characteristic is changed by the first inclination angle α, the second inclination angle β of the trapezoidal region and the height Hg between the lower and upper sides of the first and second ground planes. Impedance matching between the radiation patch and the feed line is performed, so that a separate matching stub (or matching stub) can be omitted from the radiation patch.

As a result, in the present invention, it is possible to omit the impedance matching using a matching stub (or matching stub) like a spinning patch while using a rectangular, circular or elliptical radiation patch.

Further, in the present invention, since the pattern for implementing the antenna characteristics is formed in a straight line instead of a circular or curved structure, the shape is easy to manufacture and design, so that precise characteristics can be easily implemented. Moreover, there is an advantage in that it is easy to manufacture using a CPW feeding structure and obtains a wideband impedance bandwidth.

The present invention is not only applicable directly to the UWB communication system but also slightly modified antennas can be applied to LTE, WiMax, Bluetooth, WiFi, GPS, satellite DMB, WiBro, Zigbee, etc. It is possible to combine the necessary antennas into one antenna.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

10-10c: antenna 11-11b: substrate
13a-13c: radiation patch 15a-15d: ground plane
17-17b: feed line 19: coaxial connector
20: band stop slot 20a: vertical slot
20b: horizontal slot 131: slope
151: upper side 152; Lower side
153: outer inclined surface 154: inner inclined surface
155: vertical plane 250a, 250b: trapezoidal area
252a, 252b: rectangular area

Claims (10)

Rectangular dielectric substrate;
An inverted triangular radiation patch formed on one surface of the dielectric substrate and configured to transmit / receive a signal;
First and second ground planes each having a trapezoidal area and a rectangular area in a combined shape and spaced apart from each other; And
Two sides are formed at intervals from the rectangular areas of the first and second ground planes to include a popolaner waveguide (CPW) feed line that feeds to the radiating patch;
The first and second ground planes respectively adjust the first inclination angle formed between the outer inclined surface and the lower side of the trapezoidal region, the second inclination angle formed between the inner inclined surface and the lower side, and the height between the lower side and the upper side. An ultra-wideband antenna, characterized in that impedance matching between a radiating patch and a feed line is performed while setting the bandwidth of the antenna. The ultra-wideband antenna according to claim 1, further comprising an inverted T-shaped bandstop slot inserted into the inverted triangular radiation patch to block the WLAN band. The method of claim 2, wherein the band blocking slot is a linear vertical slot formed vertically from the upper end of the reverse patch of the inverted triangle,
And a horizontal slot extending at right angles from the lower end of the vertical slot. The method of claim 3, wherein the stop bandwidth is reduced as the length of the horizontal slot is reduced in the band blocking slot,
The stop bandwidth increases as the length of the vertical slot increases, and as the length of the vertical slot decreases, the stop bandwidth decreases and the stop frequency increases. 4. The ultra-wideband antenna according to claim 3, wherein the band blocking slot has a thickness of 1.0 mm, the length of the horizontal slot is 16.9 mm, and the length of the vertical slot is 4.9 mm. Rectangular dielectric substrate;
An inverted triangular radiation patch formed on one surface of the dielectric substrate and configured to transmit / receive a signal;
First and second ground planes each formed in a trapezoidal shape and spaced apart from each other; And
Both sides are formed at intervals from the first and second ground plane to include a popolaner waveguide (CPW) feed line that feeds the radiation patch,
Each of the first and second ground planes adjusts a first inclination angle formed between a trapezoidal outer inclined surface and a lower side, a second inclination angle formed between a parallel line of the inner inclined surface and a lower side, and a height between the lower and upper sides. And setting the bandwidth of the antenna and performing impedance matching between the radiating patch and the feed line. The method of claim 6, wherein the first and the second ground plane has an inner inclined surface is disposed on the portion opposite to the inclined surface of the inverted triangular radiation patch, respectively, the feed line is a co-pollo or waveguide (in An ultra-wide band antenna, characterized in that a vertical plane parallel to the feed line is formed to form a CPW) structure. 7. The ultra-wideband antenna according to claim 6, wherein the antenna includes a right-angled triangular radiation patch cut into a vertical cut about a symmetrical plane of the y-z plane constituting a complete magnetic field and cut vertically with one side as an open surface. 10. The ultra-wideband antenna according to claim 8, wherein the substrate is left in such a way that the feed line is not directly exposed to the open surface half cut along the complete magnetic field wall. 7. The ultra-wideband antenna according to claim 6, wherein the height of the inverted triangular radiation patch is set corresponding to the λ / 4 length of the lowest frequency of the operating band.

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