KR101082775B1 - Wideband patch antenna and repeater using the same - Google Patents

Abstract

A broadband patch antenna for a repeater and a repeater using the same are disclosed. The broadband patch antenna according to the present invention comprises a dielectric block of a polyhedron having a relative dielectric constant; And a spin patch applied to the top surface of the dielectric block, the outline having at least one tapered curved portion.

Wideband Patch Antenna, ICS, Radiation Patch, Taper Curve, Gain, Isolation

Description

Wideband patch antenna and repeater using the same {Wideband patch antenna and repeater using the same}

The present invention relates to a broadband patch antenna and a repeater using the same, and more particularly, two or more vertical polarizations having different frequencies at the same time in a single patch antenna structure, which can be applied to a broadband or multiband service antenna such as a CDMA, WCDMA service, etc. Alternatively, the horizontal polarization can be used to improve the gain of a multiband antenna or a wideband antenna when used as a transmission and reception frequency. The gain of all bands of the transmitting and receiving terminals can be improved, and the beam width is controlled to isolate the antenna. The present invention relates to a broadband patch antenna suitable for an ICS repeater, a broadband service mobile communication device, and the like using the same.

Recently, due to the rapid development of wireless communication, the frequency utilization range has been widened to multimedia broadband communication such as voice and data from voice-oriented narrowband communication. In order to cope with such a change in the new communication system, a wide-ranging antenna that provides fast transmission / reception service for various data and voice signals with a single antenna is drawing attention. The wideband characteristic can be realized by a single resonant antenna having a wide bandwidth of 10% or more, a multiresonant antenna having two or more surface current flows, or the like. Recently, the ICS (Interference Cancellation System) repeater, which is rapidly gaining interest in the repeater market, transmits and receives radio signals using the broadband antenna.

1 is a view schematically showing a general ICS repeater. ICS (Interference Signal Rejection) repeater is a method of receiving the RF signal of the base station through the repeater and retransmitting the original signal as it is to the service band.At this time, the retransmitted signal removes the interference signal flowing into the receiving antenna. Doing. The general RF repeater has a disadvantage in that the transmission output and communication quality are inferior due to the feedback between the transmitting and receiving antennas, but in the case of the ICS repeater, the interference signal is directly detected and removed from the wireless signal, so that it can be sufficiently installed in the city center or the building dense area.

However, as the amount of the transmitted signal does not transmit the signal in the desired direction and flows into the receiving antenna increases, it becomes a deterioration factor of the repeater. The degree of inflow of the transmission signal into the reception antenna is expressed by the isolation of the antenna. If the antenna is poorly isolated, the repeater will not be able to output full power. In other words, the isolation characteristic of the antenna is the biggest factor that determines the performance of the repeater.

In order to improve the isolation between two antennas, there is a method of securing the ground as wide as possible to keep the beam width of the antenna narrow. This also helps to improve the gain of the antenna. However, there is a mechanical problem in extending the antenna ground plane indefinitely.

Another method of improving the isolation characteristics of the antenna is to maximize the separation distance between the two antennas. However, this method also has limitations because of its limited mechanical distance when built into the repeater.

In order to improve the isolation characteristic of the antenna under the above constraints, a technique for controlling the signal beamwidth according to the structure of the antenna radiating element is required.

In addition, Code Division Multiple Access (CDMA), Wideband CDMA (WCDMA), and Personal Communication Services (PCS) service bands, which are widely applied by ICS repeaters, satisfy a sufficient bandwidth of about 10% or more, or require a multiband antenna.

In general, an antenna having a broadband characteristic of 10% has a relatively low return loss characteristic in a used frequency band, thereby degrading the performance of the antenna. As a result, a dual band or multi band antenna is applied.

In the case of a repeater antenna, signal transmission between antennas is usually performed using only vertical polarization. In a general multiband antenna, vertical and horizontal surface current paths are used to secure two or more surface currents. This is difficult to obtain even gain in the service band. In one resonant band of multiple bands, the desired gain is obtained by using vertical polarization, while in the other resonant bands, the gain of the antenna is relatively decreased when applied to a repeater using vertical polarization because it has a horizontal surface current path. It becomes characteristic.

For example, when implementing a general patch antenna to satisfy a bandwidth of 100 MHz, such as WCDMA, horizontal polarization is used because vertical polarization should be used for one frequency band and horizontal polarization for the other frequency band for a transmitter and a receiver. A problem arises in that the antenna gain of the transmitting end or the receiving end decreases.

As mentioned above, ICS repeaters require the following characteristics: First, it is required to be able to adjust the beam width in order to increase the isolation characteristics between antennas. In order to increase the isolation characteristics of the antenna, a narrow beam width of the antenna is required. Therefore, a beam width adjusting antenna capable of adjusting the radiation beam width according to the structure of the radiation patch of the antenna is required.

Next, an even antenna gain should be obtained in the entire bands of the transmitter and receiver. In order to obtain an even gain of the antenna over the entire service area, full-band resonance must be performed by using one of the antenna's vertical and horizontal polarizations. However, when the broadband resonance characteristics are obtained using vertical and horizontal polarizations, the gain of one of the antenna transmitting and receiving terminals is severely deteriorated, so that it is difficult to obtain even antenna gain characteristics over the entire band.

2 and 3 are schematic diagrams illustrating respective embodiments of a general multiband antenna. 2 and 3, in the case of a general multi-band antenna, a slit 14 or a slot 24 is formed in an antenna 12 and 22 using an air substrate 10 or 20 using air as a dielectric. It is installed to make the path of the surface current different, or to place a multi-resonance element by placing a non-radiating element in addition to the kitchen element is used.

However, such a conventional multi-band antenna has a decrease in the strength of the signal propagated between the main resonance band and the sub-resonance band, and thus the gain of the antenna is about 30% or more lower than the maximum point. There is.

In this case, as shown in FIG. 4, a dielectric ceramic patch antenna having a patch surface 32 installed on the front surface of the dielectric block 30 and a ground surface 34 disposed on the rear surface may be used separately, but the bandwidth is narrow and Similarly, there is a problem that the gain of either the transmitting end or the receiving end is significantly reduced by 2 dB or more.

In addition, antennas applied to ICS (interference signal elimination) repeaters require very high inter-antenna isolation characteristics, and patch antennas with general slit laying have limitations in improving isolation characteristics because the desired beamwidth cannot be controlled. . The antenna emits the strongest radiation at the corners of the radiating element, and when the slit is placed, the chef is made at both edges to obtain a wide beam width. In order to remove the interference signal, the beam width of the antenna must be as narrow as possible, so that it is difficult to apply to an ICS repeater with a general slit antenna.

Conventional repeater antennas are designed to separate the radiation patch that separates the transmitter and the receiver to reduce the beam width between each antenna to improve the isolation between the antenna, and to arrange the transmit / receive radiation patch designed to improve the gain of the antenna In this configuration, the array antenna has to be additionally implemented in the feed network, the area occupied by the antenna is increased through the array shows a great disadvantage in miniaturization and ease of assembly.

The present invention was devised to solve the above problems, and can be applied to a broadband or multiband service antenna such as CDMA, WCDMA service, etc., and has two or more vertical polarization or horizontal polarization having different frequencies at the same time in a single patch antenna structure. In this case, the gain of the multiband antenna or the wideband antenna can be improved when the transmission and reception frequencies are used, the gain of all the bands of the transmitting and receiving terminals can be uniformed, and the beam width is controlled to isolate the antenna. An object of the present invention is to provide a broadband patch antenna suitable for an ICS repeater, a broadband service mobile communication device, and the like using the same.

Broadband patch antenna according to the present invention for achieving the above object, a polyhedral dielectric block having a relative dielectric constant; And a spin patch applied to the top surface of the dielectric block, the outline having at least one tapered curved portion.

Here, the spinning patch is preferably formed to include a plurality of tapered curved portions formed to be different from each other in length.

In addition, the spinning patch may be formed to include a convex tapered curved portion and at least one straight portion.

In addition, the spinning patch may be formed such that a plurality of convex tapered curved portions meet each other to form a valley.

Alternatively, the spinning patch may be formed such that a plurality of convex tapered curved portions meet each other to form a mountain.

Alternatively, the spinning patch may be formed such that a plurality of concave tapered curved portions meet each other to form a mountain.

Another embodiment of the broadband patch antenna according to the present invention for achieving the above object is a dielectric block of a polyhedron having a relative dielectric constant; And it is applied to the upper surface of the dielectric block, characterized in that it comprises a radiation patch formed of polygons connected by at least five straight lines of the outline.

Here, the radiation patch preferably includes at least one bone on the outline.

In addition, the radiation patch may be implemented to include two or more straight portions having different lengths on the outline.

The broadband patch antenna according to the embodiment, the ground electrode formed on the lower surface of the dielectric block; And a feeding pin penetrating the dielectric block and electrically connected to the radiation patch and open to the and ground electrodes.

Here, it is preferable that the length of the two sides of the radiation patch facing each other is implemented differently.

In addition, the broadband patch antenna according to the embodiment, it is preferable that the radiation patch and the ground electrode further comprises at least one independent radiator formed on the upper side or the side of the radiation patch.

Alternatively, the broadband patch antenna according to the above embodiment may be further separated from the radiation patch, and may further include at least one ground plate formed on the side of the radiation patch and connected to the ground electrode.

Preferably, the radiation patch and the ground electrode may be electrically connected to each other to realize a 1/4 wavelength.

Another embodiment of a broadband patch antenna according to the present invention, a PCB substrate; Spinning patches are applied to the plurality of arranged in the same shape on the upper surface of the PCB substrate; And a signal line for electrically connecting each said radiation patch.

Advantageously, said broadband patch antenna further comprises a ground plate secured by a foam such that an air gap is formed between said PCB substrate.

In addition, at least one side of the edge side of the ground plate may be implemented to extend vertically upward.

Another embodiment of a broadband patch antenna according to the present invention, a PCB substrate; A plurality of dielectric blocks arranged on the PCB substrate; A spinning patch applied in the shape of any one of claims 1 to 9 applied to an upper surface of each dielectric block; And a signal line electrically connecting each of the radiation patches to a bottom surface of the PCB substrate.

Embodiments of the repeater according to the present invention for achieving the above object, in the repeater is provided with a plurality of antennas, at least one of the plurality of antennas is provided with a radiation patch according to the embodiment, the plurality of Antennas installed on opposite sides of the antenna are characterized in that the strong gain is installed so as to cross.

 Another embodiment of the repeater according to the present invention for achieving the above object, in the repeater is provided with a plurality of antennas, a plurality of radiating patches are applied and arranged in the same shape on the upper surface of the first PCB substrate, and each A first antenna having a signal line electrically connecting the radiation patch; And a plurality of dielectric blocks are arranged on an upper surface of the second PCB substrate, and a second radiation patch is applied to the upper surface of each of the dielectric blocks in the shape of any one of claims 1 to 9, wherein each of the second The radiation patch comprises a second antenna electrically connected.

Here, the first antenna may be provided with a ground plate fixed by a foam so that an air gap is formed between the first PCB and the substrate.

In addition, the first antenna, at least one side of the edge side of the ground plate may extend vertically upward.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention. However, the embodiments of the present invention described below are provided to enable those skilled in the art to more easily understand the present invention, and the scope of the present invention is not limited to the described embodiments.

5 is a view schematically showing an embodiment of a broadband patch antenna according to the present invention. Referring to the drawings, the broadband patch antenna according to the present invention is provided with a radiation patch 20 formed on the upper surface of the dielectric block 10 of the polyhedron having a relative dielectric constant so that the outline includes at least one tapered curved portion. Here, the dielectric block 10 may use the same foam material or PCB material as air or air state, or may use a dielectric material having a dielectric constant of 6 or more or a dielectric ceramic material for miniaturization. Here, the dielectric block shape may be embodied in a quadrangle or polygonal upper surface. In this case, a microstrip dielectric ceramic patch antenna structure, which is easy to manufacture, low in cost, and can be implemented with a relative dielectric constant of 5 to 130 for miniaturization, is preferable. In this case, when the conductive radiator (patch) of the top surface of the dielectric block and a part of the ground surface of the bottom surface of the dielectric block are electrically connected to each other by conductor lines, they may be implemented in a quarter wavelength, thereby miniaturizing the antenna having a half wavelength. Although possible, a phenomenon in which the antenna gain is lowered may occur.

By forming the radial patch 20 as shown in the dielectric structure, a dual resonance design having two vertical polarizations or two horizontal polarizations simultaneously improves the broadband implementation of 350 MHz or higher and the gain of the wideband antenna. In addition, the gain of the entire bands of the transmitter and the receiver can be implemented to be uniform. Here, the taper curve connected to the straight line L1 serves as a receiver for vertical polarization, and the taper curve connected to a straight line L2 serves as a transmitter for vertical polarization.

In addition, a ground electrode 30 may be formed on the bottom surface of the dielectric block 10, and a feeding pin 40 penetrating the dielectric block 10 may be provided. At this time, the feeding pin 40 is preferably formed to be electrically connected to the radiation patch 20, and to be electrically open to the ground electrode (30).

As shown, the radial patch 20 may be formed so that the tapered curved portions having two convex shapes meet each other to form a valley (groove). Here, the taper curve is a curve in which the curvature changes along the left and right lengths relative to the valley (groove), and increases the frequency bandwidth within the curve, and the low frequency band and the high frequency band based on the center frequency by the valley (groove) It is separated into a plurality of frequencies constituting.

At this time, each tapered curve portion is connected with straight lines L1 and L2 so that the surface current path is half-wavelength from the curve to the bottom surface to obtain double resonance, and each taper is formed to form two or more such half-wavelength surface current paths. It is desirable to form the lengths of the curves differently.

Tapered curves can be transformed into a similar shape, which consists of a straight line or straight or one or more bends, and one or more valleys (grooves) separating the two or more frequencies within the straight or those lines. Although it may be implemented as a structure, a tapered curved structure having a curved structure in which electromagnetic signal distortion is not severe is preferable.

In addition, by adjusting the inclination of the tapered curve of the valley forming part by changing the inclination of the curved surface from a narrow beam width of 70 degrees to a wide beam width of up to 115 degrees, it can be implemented to enable a beam width adjustment of up to 45 degrees. In other words, if the slope of the curved surface is steep, the radiation beam width of the antenna can be reduced, so that the isolation characteristics of an ICS repeater requiring a narrow antenna can be improved, and a wide beam width such as a femto cell is required. In this case, by implementing a pattern such that the slope of the table curve of the radiation patch 20 has a gentle slope, the radiation beam width can be widened.

As such, by adjusting the length L1 and L2 of each straight line connected to the table curve according to the present invention and the inclination of each table curve meeting to form a valley, the characteristics of the double resonance and the radiation beam width can be adjusted. Done.

The connection of the tapered curve portion and the straight line is also applied to the following other embodiments, and the resonance of the broadband patch antenna according to the present invention is formed by the flow of surface current having half the length of L1 and L2 and the WCDMA frequency band. At high antenna gain, the antenna gain is even and uniform over the entire band, with a bandwidth above about 350 MHz.

The half-wave surface current path can be used to vary the arc length of the tapered curve, to vary the lengths of opposite edges (L1 and L2 in FIG. 5) connected to the respective tapered curves, or to measure the arc length of the tapered curves. By varying the lengths of the outer edges connected to the respective taper curves, they may be implemented differently, and thus, multiple resonant frequency bands may be divided and implemented, thereby enabling the implementation of a patch antenna having a wide band characteristic.

In addition, by applying a radiation patch 20 having a single arc of taper curve on the upper surface of the dielectric block 10, it is of course possible to implement a patch antenna having a single resonance band.

Alternatively, as shown in FIG. 5, the spinning patch 20 has a structure in which a plurality of convex tapered curved portions meet each other to form a mountain, and as shown in FIG. 6, a plurality of concave tapered curved portions meet and bend in a predetermined direction. It may be formed to form a protruding mountain. In addition, as shown in FIG. 7, the radiation patch 20 may be formed such that a plurality of convex tapered curved portions meet each other to form a protruding mountain bent in a predetermined direction. At this time, as in the case of the above-described goal, the beam width of the broadband patch antenna can be adjusted by adjusting the slope of each taper curve that meets to form a mountain. This principle also applies to the following other embodiments.

In addition, as shown in Figure 8, the radial patch 20 may be implemented to form a valley by connecting the convex tapered curved portion and the straight portion. In this case, when L1 and L2, which are straight portions of the conductive radiation patch 20, which are the main factors for determining the frequency of the antenna, are determined, the arc length L3 and the linear length L4 of the adjacent tapered curve portions are proportional to L1 and L2 lengths. Although it is determined, even if the length of L1 is short, the length of L3 is longer than the length of L4 so that the half-wave surface current path can be changed.

In addition, as shown in Figures 9a and 9b, the radial patch 20 is to be implemented in a trapezoidal shape in which the length of each straight line connected to the convex tapered curved portion is different from each other but not parallel to each other and narrowed or widened in the downward direction. As shown in FIG. 9C, it may be formed only by a combination of convex tapered curved portions having different lengths. By modifying the shape of the outer edges as described above, it is possible to adjust the beamwidth, gain, and isolation characteristics of the broadband patch antenna.

In addition, there may be various modifications such as a convex tapered curved portion and a concave tapered curved portion to meet and form a hill or a valley, a plurality of concave tapered curved portions to meet to form a valley.

As described above, the broadband patch antenna having the curved tapered structure can form a beam in a desired direction by changing the radiation beam width according to the tapered curve shape. If the slope is sharply taken within the two curves of the tapered structure, a narrow beam width is formed, which increases the gain of the antenna and the radiation beam width has a narrow characteristic. However, if the slope is sharply taken out of the two curves of the tapered structure, a wide beam width is formed, which is suitable for a wide radiation beam service. If the curved slope of the antenna is sharply taken from the inside to obtain a narrow beam width, it is easy to apply to an antenna for an ICS repeater which requires excellent isolation characteristics, and the natural radiation through the curved surface rather than the sudden radiation through the corners in the antenna radiation. By inducing the antenna gain is evenly made over the entire band.

As described above, the broadband patch antenna according to the present invention induces an even antenna gain in the service band, and the antenna developed to bring the radiation beam width as narrow as possible is isolated between antennas when the ground electrodes 30 are installed in the ICS repeater facing each other. It improves the characteristics and can achieve high performance of more than 95% of antenna efficiency.

The tapered curve portion of the spinning patch 20 may be replaced by a straight line, as shown in FIG. That is, the radiation patch 20 may be formed as a polygon whose outline is connected by five or more straight lines. When a wide beam width is required, as shown in FIG. 10, the curve of the radiation patch 20 is reduced as much as possible, and a pattern is implemented vertically near the edges of both ends so that the radiation beam can obtain the maximum beam width, and thus a femto cell. The wide beam width of the lamp can be used for the desired service.

The broadband patch antenna according to the present invention is capable of adjusting the beam width of up to 45 degrees by changing the slope of the curved surface from the narrow beam width of at least 70 degrees to the wide beam width of up to 115 degrees.

As a result, the broadband patch antenna according to the present invention forms two resonance frequencies by using the curve of the projecting structure of the radiation patch 20 having a different structure, which secures a bandwidth of about 350 MHz and has a broadband characteristic of 17.5%. It has a relatively narrow beamwidth of 70 degrees HPBW (half power beamwidth).

11 to 13 illustrate another embodiment of the broadband patch antenna each having a linear polygonal shape. As shown in FIG. 11, the radiation patch 20 may have a structure in which two straight lines inclined from both sidewalls meet each other to form a valley, and as shown in FIG. 12, they are extended by bending at various angles. The straight lines may meet each other to form a valley. In addition, as shown in FIG. 13, two straight lines which are inclined from both sidewalls may be formed to have a structure in which they bend to form a protruding mountain. At this time, in order to make the half-wave surface current paths of the structures different from each other, the heights of both sidewalls are preferably implemented differently.

FIG. 14 is a view showing a structure in which an independent radiator is provided to improve gain and isolation characteristics, and FIG. 14A shows a structure installed on an upper side of a spinning patch, and FIG. 14B shows a structure installed on a side of the spinning patch. In this case, the independent radiator 50 may be separated from the radiation patch 20 and the ground electrode 30, and may be installed to be parallel or at an angle with the radiation patch 20.

15 is a view showing a structure in which a ground plate is provided in order to improve gain and isolation characteristics. At this time, the ground plate 60 is separated from the radiation patch 20, it is preferable to be formed in connection with the ground electrode 30 on the side of the radiation patch 20.

The independent radiator 50 or the ground plate 60 may be installed in some cases to improve the gain and isolation characteristics of the broadband patch antenna.

In order to improve the gain of 7 to 8 dBi or more, or to use as an ICS repeater antenna, the gain and isolation characteristics of the antenna itself are limited, so that an independent radiator 50 such as FIG. 14 or FIG. By installing the ground plate 60, it is possible to replace the small and medium existing repeater antenna of the existing gain is 7dBi or more and 120 ㅧ 120mm or more.

In addition, in order to improve the isolation characteristics inside the SET of the ICS repeater 100 (see FIG. 1) where the broadband patch antennas are located on opposite sides, the gain direction of the antenna 1 110 and the antenna 2 120 is strong. The isolation characteristics can be improved by using antennas with different antenna gain directions so as not to overlap each other, or by rotating relative to the horizontal plane or changing the antenna orientation angle so that the directions where the strong gains of each antenna do not overlap. For example, antenna 1 uses an antenna in which two different frequencies (transmit / receive frequencies) exist in a single patch as shown in FIG. 5, and antenna 2 is provided with slits or slots as shown in FIG. 2 or 3. The use of a multi-band antenna with a typical PCB structure improves mutual isolation by avoiding overlapping gain directions between two opposing antennas.

Also, in order to improve antenna gain and isolation characteristics when the set size of the ICS repeater 100 (see FIG. 1) is larger than 100 mm within the set SET, the antenna 1 110 is as shown in FIG. 16 or 17. The antenna of the PCB structure in which the slit or slot is installed is configured as an array antenna having 1x2 or 2x2 arrays having high gain and excellent beam width, and the antennas 2 120 include a plurality of antennas as shown in FIG. 18 or 19. On each top surface of the ceramic dielectric, a radiating patch including a polygonal structure or a tapered curved structure is formed. Can be configured. Here, the antenna 2 120 may be configured as an array antenna structure of a ceramic patch for implementing a general linear polarization, but in this case because the bandwidth is narrowed, as shown in Figure 18 of the ceramic patch for implementing a circular polarization or an elliptic polarization It is preferable to be configured with an array antenna structure. At this time, each antenna constituting the array antenna is preferably electrically connected to each other by a signal line formed on the upper or lower surface of the PCB substrate. However, the shapes of the antenna 1 110 and the antenna 2 120 of the ICS repeater 100 is not limited to such an array structure. For example, antenna 1 110 may be configured as an array antenna of the PCB structure of FIG. 16 or 17, and antenna 2 120 may be configured of an antenna of the single PCB structure of FIG. 2 or 3, and antenna 1 ( 110 may be configured with the array antenna of FIG. 18 or 19 and antenna 2 120 may be configured with the antenna of the single PCB structure of FIG. 2 or 3, and various combinations of modifications are possible.

Here, the method of implementing the array antenna uses a plurality of ceramic patch antenna structure with a high dielectric constant to enable the miniaturization of the antenna as shown in Figure 5 and the signal connection between the patch antenna is connected using a PCB signal line, for example 18 or 19, when four ceramic patch antennas are arranged on the same plane, the beam width of each single ceramic patch antenna is also narrow and radiates from the radiation conductor 20 located on the dielectric top surface. Peripheral dielectric ceramics 10 may attenuate unnecessary signals radiated in the direction of adjacent patch antennas or peripheral directions (other arrayed patch antennas) in addition to the directing direction due to their dielectric loss. Utilizing a small layer of air allows the IC to gain in the desired direction and reduce beamwidth The isolation characteristics of the S repeater can be improved.

As another implementation method, a method of making an array antenna by implementing a plurality of conductive radiation patterns in one dielectric ceramic block may be considered. In this case, antenna miniaturization can be achieved, but the gain reduction and narrowness due to the dielectric loss of the dielectric block itself are narrowed. It is not suitable for use as a repeater antenna because one bandwidth and weight becomes heavy.

In the structure where the antennas are all embedded inside the set and the antennas are installed opposite each other (ie, the antennas are installed at the front and the rear of the set, respectively) such as an ICS repeater, it is necessary to improve the isolation characteristics as well as the antenna gain. In order to improve the antenna gain and isolation characteristics of the type PCB antenna, 1x2 or 2x2 conductive radiators (patches) are formed on the upper surface of the PCB and spaced apart from the ground plate at regular intervals from the lower surface of the PCB as shown in FIG. An air gap is formed between the conductive ground plate and the PCB substrate corresponding to the total area of the PCB, and at least one conductive ground plane is provided on the side of the conductive ground plate to extend toward the top surface of the antenna to isolate the antenna. Can be improved. At this time, as shown, it is preferable to extend the edge side surfaces of all directions of the ground plane vertically toward the antenna top surface.

 In addition, in order to fix PCB type array antenna and ground plane and make overall height thin, make PCB thickness as thick as 4 ~ 5mm to form conductive ground plane at the bottom of PCB itself or conduction located at bottom of PCB Although it can be attached with a ground plate and double-sided conductive tape, the antenna gain is reduced due to the dielectric loss of the PCB board itself and the manufacturing cost is increased. Low-dielectric conductivity double-sided conductivity that does not affect antenna performance so that the conductive ground plate and the PCB-type array antenna form a constant air gap and the antenna height can be fixed slim. By fixing with taped foam, antenna performance can be improved and height can be lowered.

On the other hand, when using the antenna of the array structure to improve the isolation characteristics in the set (SET) of the ICS repeater 100 (see Fig. 1) located on the opposite side of each other, the antenna 1 (110) of FIG. The antenna 2 and the antenna 2 (120) using the antenna of Fig. 16 or 17 so that the strong gain directions do not overlap each other, or the antenna 1 (110) and the antenna 2 (120) similar structure (for example For example, when the ceramic patch antenna is used, the structure of FIGS. 18 and 18 or 19 and 19 is used, and when the thin PCB antenna is used, the antenna of FIGS. 16 and 16 or the same structure of FIGS. 17 and 17) is used. It is desirable to improve the isolation characteristics by rotating relative to the horizontal plane or changing the antenna orientation angle so that the directions of the strong antenna gains do not overlap.

Also, in order to improve the gain or to avoid overlapping portions having high gains in the same direction as the antenna 2, the antenna 1 uses the independent radiator 50 or the ground plate 60 in the same manner as the method of FIG. 14 and FIG. 15. In addition, isolation characteristics and gains may be improved.

The principle of the method of improving the isolation characteristics is as follows.

Antenna 1 has antenna gain in the directing direction, but also the signal radiation (backlobe) occurs in the rear of the antenna, and if the antenna gain is strong in the directing direction (antenna front), relatively strong signal radiation (backlobe) occurs in the rear of the antenna. . In this case, when the antenna 2 has the strong antenna gain in the same direction, the isolation characteristic is deteriorated when a large amount of signal radiation from the other antenna is received. Use a phenomenon that improves the characteristics.

Some improvements are possible by using the same antenna and arranging each antenna gain in a strong direction, but there are limitations in all directions, so rather design different antenna gain directions by different antenna designs. After that, the method of arranging and improving the antennas to maximize the isolation characteristics is efficient. In this case, the antenna can improve the isolation characteristics not only in the structure located in front of and behind the repeater, that is, facing in the opposite direction, but also in the structure located on the same plane in the repeater.

The radiation patch is applied to the 35x35x10mm dielectric block in the shape of FIG. 5, and the characteristics of such a wideband patch antenna are compared with those of the general ceramic patch antenna of FIG. As

Bandwidth Beam width Transmitter Gain Receiver Gain Measurement Conventional ceramic
Patch antenna 250 MHz 82 4.5 dBi
5.0 dBi 3.4 dBi
2.4 dBi 100x100mm Broadband
Patch antenna 400 MHz 97 5.5 dBi
5.0 dBi 5.5 dBi
5.5 dBi 60x60mm

The bandwidth of the broadband patch antenna according to the present invention was superior to 150MHz or more, and the V-pole gain was better than 2 to 3dBi over the conventional patch antenna. In addition, the broadband patch antenna according to the present invention can be applied to the femtocell because the beam width is more than 15 degrees wide, the beam width can be extended to 120 degrees. Accordingly, it can be seen that the performance is superior to conventional ceramic patch antennas with 100x100mm ground conditions even under the measurement ground smaller than 60x60mm.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the present invention is not limited to the specific embodiments of the present invention without departing from the spirit of the present invention as claimed in the claims. Anyone skilled in the art can make various modifications, as well as such modifications are within the scope of the claims.

1 is a view schematically showing a general ICS repeater.

2 is a diagram illustrating an example of a general dual band antenna.

3 is a diagram illustrating another example of a general dual band antenna.

4 is a diagram illustrating a general dielectric ceramic patch antenna.

5 is a view showing a first embodiment of a broadband patch antenna according to the present invention.

6 is a view showing a second embodiment of a broadband patch antenna according to the present invention.

7 is a view showing a third embodiment of a broadband patch antenna according to the present invention.

8 is a view showing a fourth embodiment of a broadband patch antenna according to the present invention.

9 is a view showing a fifth embodiment of a broadband patch antenna according to the present invention.

10 is a view showing a sixth embodiment of a broadband patch antenna according to the present invention.

11 is a view showing a seventh embodiment of a broadband patch antenna according to the present invention.

12 is a view showing an eighth embodiment of a broadband patch antenna according to the present invention.

13 illustrates a ninth embodiment of a broadband patch antenna according to the present invention.

14 is a view showing a tenth embodiment of a broadband patch antenna according to the present invention.

15 is a view showing an eleventh embodiment of a broadband patch antenna according to the present invention.

16 is a diagram illustrating a first embodiment of a broadband patch antenna having an array antenna structure.

17 is a diagram illustrating a second embodiment of a wideband patch antenna having an array antenna structure.

18 illustrates a third embodiment of a wideband patch antenna having an array antenna structure.

19 illustrates a fourth embodiment of a wideband patch antenna having an array antenna structure.

20 is a diagram illustrating a fifth embodiment of a wideband patch antenna having an array antenna structure.

Claims (23)

Polyhedral dielectric blocks having a relative dielectric constant; And Broadband patch antenna, which is applied to the upper surface of the dielectric block, and provided with a plurality of tapered curves or tapered straight outlines of different lengths are formed to form a valley or hill shape. delete The method of claim 1, The radiation patch is a broadband patch antenna, characterized in that formed to include a convex tapered curved portion and at least one straight portion. The method of claim 1, The radiation patch is a broadband patch antenna, characterized in that formed in a plurality of convex tapered curved portions meet each other to form a valley. The method of claim 4, wherein Broadband patch antenna, characterized in that for controlling the beam width by adjusting the slope of each of the tapered curve forming the valley. The method of claim 1, The radiation patch is a broadband patch antenna, characterized in that the convex tapered curved portion formed to meet each other to form a mountain. The method of claim 1, The radiation patch is a broadband patch antenna, characterized in that formed in a plurality of concave tapered curved portions meet each other to form a mountain. The method of claim 1, And the tapered straight line has a radiating patch formed of polygons connected to at least five or more lines. delete delete The method according to any one of claims 1 and 3 to 8, A ground electrode formed on the bottom surface of the dielectric block; And And a feeding pin penetrating said dielectric block and electrically connected to said radiating patch and open to said and ground electrodes. The method of claim 11, The radiation patch is a broadband patch antenna, characterized in that the length of the two sides facing each other are different. The method of claim 11, And at least one independent radiator separated from the radiating patch and the ground electrode, the at least one independent radiator formed on an upper side or a side of the radiating patch. The method of claim 11, And at least one ground plate separated from the radiation patch and connected to the ground electrode on a side of the radiation patch. The method of claim 11, Broadband patch antenna, characterized in that to implement a 1/4 wavelength by electrically connecting the radiation patch and the ground electrode. delete delete delete The method according to any one of claims 1 and 3 to 8, A plurality of the dielectric blocks on which the radiation patches are formed are arranged on a PCB substrate, And a signal line electrically connecting each of said radiating patches to a bottom surface of said PCB substrate. In a repeater in which a plurality of antennas are installed, At least one of the plurality of antennas is provided as a broadband patch antenna of any one of claims 1, 3 to 8. Repeater, characterized in that the antenna is installed on the opposite sides of the plurality of antennas are installed so that the strong gain is staggered. In a repeater in which a plurality of antennas are installed, A first antenna having a plurality of radiating patches applied in a plurality of shapes arranged on the upper surface of the first PCB substrate, and a signal line electrically connecting the radiating patches; And A repeater comprising a plurality of broadband patch antennas of any one of claims 1, 3 to 8 on the upper surface of the second PCB substrate and each of the broadband patch antennas comprises a second antenna electrically connected thereto. . delete delete

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