KR20100066279A - Antenna structure for frequency-reconfigurable operations - Google Patents

Abstract

PURPOSE: An antenna structure for a frequency reconstruction operation is provided to improve a broadband characteristic by improving an input impedance matching characteristic. CONSTITUTION: A first radiator(130) is formed on a ground plate. The first radiator transmits and receives a signal of a first frequency band(B1). A second radiator(140) is formed on the first radiator. The second radiator transmits and receives the signal of a second frequency band(B2) higher than the first frequency band. A battery feed unit(110) is formed on the upper side or lower side of the ground plate. The battery feed unit receives the signal through the radiator corresponding to a receiving frequency.

Description

ANTENNA STRUCTURE FOR FREQUENCY-RECONFIGURABLE OPERATIONS}

The present invention relates to an antenna structure, and more particularly to an antenna structure for a frequency reconstruction operation.

The present invention is derived from a study conducted as part of the IT source technology development project of the Ministry of Knowledge Economy [2007-F-041-02, Intelligent antenna technology development research].

In general, a wireless communication system transmits / receives data or signals using a predetermined frequency. At this time, an antenna is an end of the wireless communication system as an important element for transmitting and receiving signals in the wireless communication system. Such antennas should be configured to efficiently transmit and receive electromagnetic waves, and many researches and developments have been made on antennas.

There are many types of antennas, but high-frequency antennas are commonly used, including dipole antennas, monopole antennas, patch antennas, horn antennas, and parabolic antennas. parabolic antennas, helical antennas, slot antennas, and the like.

Among these various antennas, an antenna used in a base station, a repeater, or a mobile communication terminal has an arbitrary band characteristic, and also has a unique polarization characteristic. And because the antenna used in such a general base station, repeater or terminal has a fixed polarization and a fixed frequency characteristics, it is common to operate in a single mode.

However, when the wireless communication service flows in the future, the technology trend that is complex or converged, the antenna used in the base station, repeater or mobile communication terminal needs to operate in a multi-mode that can reconfigure the frequency in real time. Conventional reconstruction antenna technology is capable of operating in multiple modes by reconfiguring the frequency by controlling a plurality of switching elements connected to the antenna radiator itself. However, such a reconfigured antenna has a disadvantage in that insertion loss is large because a plurality of switching elements are used. In addition, the antenna efficiency is very low due to the complicated electrical external control circuit. In addition, in the multi-mode operation, it is inconvenient to match the input impedances of the plurality of antennas to the switching elements again, and it is difficult to have broadband characteristics due to the complicated structure. In addition, the use of a plurality of switching elements limits the maximum input power of the antenna and degrades the operation reliability of the antenna. In addition, it is difficult to design a reconstructed array antenna system using such a reconstructed antenna as a unit element, and electrical performance is very poor.

Accordingly, the present invention provides an antenna structure capable of frequency reconstruction.

In addition, the present invention provides an antenna structure capable of minimizing the number of switching elements used in a general array antenna system.

In addition, an antenna structure having broadband characteristics is provided.

In addition, the present invention provides an antenna structure capable of minimizing interference between antennas and generation of higher order mode signals.

An antenna structure according to the present invention includes a ground plate, a first radiator formed on the ground plate and electrically connected to the ground plate, and transmitting and receiving a signal in a first frequency band, and formed on the first radiator to electrically connect the first radiator. A second radiator which transmits and receives a signal of a second frequency band higher than the first frequency band and is used as a ground plane or a reflection plane, and is formed on an upper or lower portion of the ground plate and transmits a signal to a radiator corresponding to a frequency to be transmitted. It provides a, and a power supply for receiving a signal through a radiator corresponding to the reception frequency.

In addition, the second radiator may be plural, and the plurality of second radiators may be formed on the first radiator spaced apart from each other.

In addition, it is preferable to further include a third radiator formed on the second radiator, electrically connected to the second radiator, and transmitting and receiving a signal of a third frequency band higher than the second frequency band.

The apparatus may further include a plurality of third emitters formed on the first radiator, electrically connected to the first radiator, spaced apart from the second radiator, and transmitting and receiving signals in a third frequency band higher than the second frequency band. It is desirable to.

Using the antenna structure according to the present invention, frequency reconstruction is possible, and there is an advantage in that the number of switching elements used in a general reconstruction antenna system can be minimized. In addition, since the antenna efficiency can be increased and the input impedance matching characteristic can be improved, there is an advantage that the broadband characteristic can be obtained. In addition, there is an advantage to minimize the influence of interference between the radiators and the generation of higher order mode.

In addition, using the antenna system according to the present invention in a general array antenna system, there is an advantage that can minimize the size of the array antenna system.

In addition, the software defined radio (SDR) and cognitive radio functions required by the next generation mobile communication base station / relay antenna system may be widely used in the base station / relay antenna system. In addition, since one antenna system operates in multiple modes, it is expected that there will be many economic effects in view of the absolute necessity of developing a mobile communication base station / relay antenna for a future complex service.

Hereinafter, the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, a part obvious to those skilled in the art will be omitted so as not to disturb the gist of the present invention. In addition, it is to be noted that each of the terms described below are only used to help the understanding of the present invention, and may be used in different terms despite the same purpose in each manufacturing company or research group.

1 is a view for explaining a mobile communication frequency band.

In FIG. 1, the first band B1 is a frequency band used by a cellular system, the second band B2 is a frequency band used by a PCS / WCDMA / WiBro / WLAN system, and a third band B3. ) Is the frequency band used by the WiMAX system.

The antenna system according to the present invention disclosed below may be used in at least two or more bands among the first to third bands B1, B2, and B3 shown in FIG. 1. In addition, the antenna system according to the present invention can be used even in a frequency band not shown in FIG. 1. However, hereinafter, only the band shown in FIG. 1 will be described as an example for convenience of description. Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a conceptual diagram of a reconstruction antenna structure according to the first embodiment of the present invention.

The reconstructed antenna structure 100 according to the first embodiment of the present invention shown in FIG. 2 includes identical heterogeneous radiators 130 and 140 and a power supply unit 110 for a frequency reconstruction operation. The reconstruction antenna structure 100 according to the first embodiment of the present invention is a unit antenna capable of reconstructing frequencies in the first to second bands B1 and B2 as the most basic form of the homogeneous heterogeneous radiator antenna system proposed by the present invention. Structure. Referring first to the reconstruction antenna structure 100 according to the first embodiment of the present invention, the signal of the second band (B2) is transmitted and received on the first radiator 130 for transmitting and receiving the signal of the first band (B1) The second radiator 140 is disposed. The reconstruction antenna structure 100 according to the first embodiment of the present invention having such a structure may be used as a unit antenna of an array antenna system of a base station / relay for a frequency reconstruction operation. Next, each component of the reconstruction antenna structure 100 according to the first embodiment of the present invention will be described in detail.

Referring to FIG. 2, the unit reconstruction antenna structure 100 according to the first embodiment of the present disclosure may include a power supply unit 110, a ground plate 120, a first radiator 130, and a second radiator 140. Include. In Fig. 2, reference numeral 10 denotes a transmission input terminal, and reference numeral 20 denotes a reception output terminal. Reference numeral 30 denotes that the transmission control data and the DC power supply for frequency reconstruction are provided to the power supply unit 110, reference numeral 40 denotes the reception control data and DC supply power for the frequency reconstruction is provided to the power supply unit 110. It is shown.

The power supply unit 110 may provide a transmission signal to be radiated from the first radiator 130 and the second radiator 140, or may receive a reception signal received through the first radiator 130 and the second radiator 140. . 2, the feeder 110 may be formed below the ground plate 120, but may also be formed on the ground plate 120.

In addition, the power supply unit 110 receives a plurality of transmission signals input to the transmission input terminal 10 and receives transmission input control data and a DC power supply. Referring to the operation of the power supply unit 110, the power supply unit 110 selects a transmission signal indicated by transmission input control data from among a plurality of received transmission signals. And when the selected transmission signal is a signal included in the first band B1, the selected transmission signal is output to the first radiator 130, or when the selected transmission signal is a signal included in the second band B2, the selected transmission signal. Is provided to the second radiator 140.

In addition, the power supply unit 110 is provided with a plurality of received signals received through the first radiator 130 or the second radiator 140. The reception signal indicated by the reception input control data is output from the plurality of reception signals provided to the reception output terminal 20. A more specific transmission / reception operation of the power supply unit 110 will be described in detail later with reference to FIG. 13.

The ground plate 120 is the ground of the reconstruction antenna structure 100 according to the first embodiment of the present invention. The ground plate 120 is disposed between the feeder 110 and the first radiator 130. Here, as described above, it should be noted that the feeder 110 may be formed on the ground plate 120.

In addition, the ground plate 120 may be configured in a form capable of controlling or adjusting a beam pattern of the first radiator 130. To this end, the edge of the ground plate 120 may be bent in the direction of the first radiator 130. This will be described later in detail with reference to FIG. 3.

The first radiator 130 is formed on the ground plate 120 and receives the transmission signal included in the first band B1 from the power supply unit 110 and converts it into an electromagnetic wave to radiate it to the outside. In addition, the first radiator 130 receives the electromagnetic wave included in the first band B1, converts it into an electrical signal, and provides the same to the power supply unit 110.

In addition, the first radiator 130 serves as a ground plate of the second radiator 140 when the second radiator 140 operates. The ground plate role of the first radiator 130 is possible because the first radiator 130 is electrically connected to the ground plate 120. In addition, the first radiator may serve as a reflector when the second radiator 140 operates.

The second radiator 140 is formed on the first radiator 130, receives the transmission signal included in the second band B2 from the power supply unit 110, converts it into an electromagnetic wave form, and radiates it to the outside. In addition, the second radiator 140 receives the electromagnetic wave included in the second band B2, converts it into an electrical signal, and provides the same to the power supply unit 110.

Next, a detailed example of the reconstruction antenna structure 100 according to the first embodiment of the present invention will be described with reference to FIG. 3.

3A and 3B are plan and front views when only the ground plate 120 and the first radiator 130 of the reconstructed antenna structure 100 according to the first embodiment of the present invention are embodied. Here, FIG. 3A is a plan view and FIG. 3B is a front view.

In (a) to (b) of FIG. 3, GWW = 255.2mm, GW = 220mm, GL = 300mm, GD = Φ 40mm, GH = 28.98mm, GT = 2mm, T1 = 2mm, H1 = 17.5mm, A = 60 °, L1 = 160 mm, OX = OY = 34 mm.

Referring to FIGS. 3A to 3B, the ground plate 120 and the first radiator 130 of the reconstructed antenna structure 100 according to the first embodiment of the present invention have an airstrip structure. Form. In this specification, as shown in FIG. 3, the air strip structure refers to a structure in which air is present between the patch-shaped first radiator 130 and the ground plate 120. In order to form such an air strip structure, a cylindrical pillar 135 formed of a conductor is formed between the center of the first radiator 130 and the center of the ground plate 120. The cylindrical pillar 135 serves to support the first radiator 130 and to electrically short the first radiator 130 and the ground plate 120.

As described above, the ground plate 120 has a shape in which the edge 160 is bent at a predetermined angle in the direction of the first radiator 130. When the edge 160 of the ground plate 120 is bent in this manner, the beam pattern in the azimuth direction of the electromagnetic wave emitted from the first radiator 130 may be controlled or adjusted. The angle formed between the edge 160 of the ground plate 120 and the ground may vary according to a user's design, and the beam pattern in the azimuth direction of the electromagnetic wave emitted from the first radiator 130 may vary according to the angle.

Referring again to FIG. 2, a second radiator 140 is formed on the first radiator 130. When the second radiator 140 is formed on the first radiator 130 as described above, the second radiator 140 may degrade the beam pattern of the first radiator 130. In order to improve this problem, in the present invention, as shown in Figure 3 (a), the first radiator 130 is formed in a four-terminal excitation structure. In the four-terminal excitation structure, two terminals are a transmission excitation terminal, and the other two terminals are a reception excitation terminal. Since the four-terminal excitation structure is implemented in the first radiator 130, the feed section (not shown) is intended to include a balun. Detailed description thereof will be described in detail with reference to FIG. 13.

4A to 4D are plan views of examples of the power supply unit 110, the ground plate 120, and the first radiator 130 of the reconstructed antenna structure 100 according to the first embodiment of the present invention. , Front view, perspective view and bottom view. Here, FIG. 4A is a top view, FIG. 4B is a front view, FIG. 4C is a perspective view, and FIG. 4D is a bottom view.

Referring to FIGS. 4A to 4D, the feeding part 110 is formed under the ground plate 120, and the edge 160 of the ground plate 120 is bent at a predetermined angle with the ground. Take form.

In addition, the first radiator 130 and the ground plate 120 is formed in an air strip structure, for this purpose, a cylindrical pillar 135 is formed on the center of the ground plate 120. Through this cylindrical column 135, the first radiator 130 is electrically shorted to the ground plate 120 and is kept constant over the ground plate 120.

5 (a) to 5 (b) are a plan view and a front view of an example of the reconstruction antenna structure 100 according to the first embodiment of the present invention. Here, FIG. 5A is a plan view and FIG. 5B is a front view.

In Figs. 5A to 5B, D _CB = 140 mm, T _CB = 1 mm, H _CB = 48.8 mm, L1 = 74.3 mm, H1 = 30 mm, and H2 = 17.8 mm.

Referring to FIGS. 5A to 5B, the second radiator 140 is formed of a wideband cross dipole antenna structure, and has a transmit / receive structure having a two-terminal orthogonal excitation structure. The second radiator 140 is mounted on the center of the first radiator 130 and connected to the feeder 120 through a feed line included in the cylindrical pillar 135. In addition, the first radiator 130 provides a path for connecting the second radiator 140 and the ground plate 120.

Meanwhile, the reconstructed antenna structure 100 according to the first embodiment of the present invention may further include an interferer 170 for improving the gain of the second radiator 140. The interferer 170 is formed on the first radiator 130 in a shape surrounding the second radiator 140 and is formed to be substantially similar to the height of the first radiator 130.

6 (a) to 6 (c) are a front view, a perspective view, and a bottom view of the reconstructed antenna structure 100 according to the first embodiment of the present invention shown in (a) to (b) of FIG. Here, FIG. 6 (a) is a front view, FIG. 6 (b) is a perspective view, and FIG. 6 (c) is a bottom view.

In FIGS. 6A to 6C, although the feeding part 110 is formed under the ground plate 120, it may be formed on the ground plate 120.

7 (a) to 7 (c) are a plan view, a front view and a perspective view of another example of the reconstructed antenna structure 100 according to the first embodiment of the present invention. Here, FIG. 7A is a plan view, FIG. 7B is a front view, and FIG. 7C is a perspective view.

Referring to (a) to (c) of FIG. 7, another example of the reconstruction antenna structure according to the first embodiment of the present invention is one of the reconstruction antenna structures according to the first embodiment of the present invention shown in FIG. 6. The other components are identical except for the second radiator 140 in the example.

The second radiator 140 shown in FIGS. 7A to 7C has the same antenna structure as the structure of the second radiator 140 shown in FIG. 6, but has a gain such as a multilayer circular conductor array structure thereon. There is a difference in that directional elements that can increase the number can be stacked.

8 is a conceptual diagram of a reconstruction antenna structure 200 according to a second embodiment of the present invention. Referring to FIG. 8, the reconstruction antenna structure 200 according to the second embodiment of the present invention includes a power supply unit 110, a ground plate 120, a first radiator 130, and a third radiator 150. do. Here, the feeder 110, the ground plate 120, the first radiator 130 is a feeder, the ground plate, the first of the reconstructed antenna structure 100 according to the first embodiment of the present invention shown in FIG. Since the same components as the radiator, the description thereof will be replaced with the above-described parts. Then, only the description of the third radiator 150 will be described below.

The third radiator 150 is formed on the first radiator 130, receives the transmission signal included in the third band B3 from the power supply unit 110, converts it into an electromagnetic wave form, and radiates it to the outside. In addition, the third radiator 150 receives the electromagnetic wave included in the third band B3, converts the electromagnetic wave into an electrical signal, and provides the converted received signal to the power supply unit 110.

9 is a conceptual diagram of a reconstruction antenna structure 300 according to a third embodiment of the present invention. Referring to FIG. 9, the reconstruction antenna structure 300 according to the third embodiment of the present disclosure may include a power supply unit 110, a ground plate 120, a first radiator 130, and third radiators 151 and 153. ). Here, the feeder 110, the ground plate 120, the first radiator 130 is a feeder, ground plate, the first of the reconstructed antenna structure 100 according to the first embodiment of the present invention shown in FIG. Since the same components as the radiator, the description thereof will be replaced with the above-described parts.

The third radiators 151 and 153 are spaced apart from each other, and are formed on the first radiator 130. To emit. In addition, the third radiators 151 and 153 receive electromagnetic waves included in the third band B3, convert the electromagnetic waves into electrical signals, and provide the converted received signals to the power supply unit 110.

Next, an example of the reconstruction antenna structure 300 according to the third embodiment of the present invention will be described with reference to the accompanying drawings.

10 (a) to 10 (b) are a plan view and a front view of an example of the reconstructed antenna structure 300 according to the third embodiment of the present invention. Here, FIG. 10A is a plan view and FIG. 10B is a front view.

In FIG.10 (a)-(b), L1 = 30.6mm, L2 = 35.3mm, H1 = 4.44mm, WT = 3mm, LT1 = 7.5mm, LT2 = 6.5mm, W50 = 1.56mm.

Referring to FIGS. 10A to 10B, the third radiators 151 and 153 are implemented by stacked microstrip patch antennas, and the third radiators 151 and 153 are respectively formed by the first radiator 130. Are spaced apart from each other. In addition, parasitic elements of the stacked microstrip patch antenna used as the third radiators 151 and 153 are maintained at regular intervals by a shorting column passing through the center of the driving microstrip element.

As such, the third radiators 151 and 153 are implemented on the first radiator 130 and are connected to the feeder 110 through a feed line included in the cylindrical pillar 135.

11A to 11D are a plan view, a front view, a perspective view, and a bottom view of an example of the reconstructed antenna structure 300 according to the third embodiment of the present invention. Here, FIG. 11A is a plan view, FIG. 11B is a front view, FIG. 11C is a perspective view, and FIG. 11D is a bottom view.

12 is a conceptual diagram of a reconstruction antenna structure 400 according to a fourth embodiment of the present invention. Referring to FIG. 12, the reconstruction antenna structure 400 according to the fourth embodiment of the present disclosure includes a power supply unit 110, a ground plate 120, a first radiator 130, a second radiator 140, and a first radiator 140. Three radiators 150 are included. Here, the feed unit 110, the ground plate 120, the first radiator 130 and the second radiator 140 is a feed of the reconstruction antenna structure 100 according to the first embodiment of the present invention shown in FIG. Since all are the same components as the ground plate, the first radiator and the second radiator, the description thereof will be replaced with the above-described parts.

The third radiator 150 is formed on the second radiator 140, receives the transmission signal included in the third band B3 from the power supply unit 110, converts it into an electromagnetic wave form, and radiates it to the outside. In addition, the third radiator 150 receives the electromagnetic wave included in the third band B3, converts the electromagnetic wave into an electrical signal, and provides the converted received signal to the power supply unit 110.

Hereinafter, the operation of the reconstruction antenna structure 400 according to the fourth embodiment of the present invention will be described with reference to FIG. 13.

13 is a block diagram illustrating a power supply unit 110 for explaining the operation of the reconstruction antenna structure 400 according to the fourth embodiment of the present invention.

Referring to FIG. 13, a signal transmission process of the reconstruction antenna structure 400 according to the fourth embodiment of the present invention will be described first.

When a plurality of transmission signals are input to the first switching unit T110 through the transmission input terminal 10, the first switching unit T110 may transmit a transmission signal indicated by the transmission control data 30 among the plurality of transmission signals. Choose. In addition, the first switching unit T110 outputs the selected transmission signal to one of the first to third radiators 130, 140, and 150 according to the frequency of the selected transmission signal. Here, a transmission signal processor and a transmission balun are provided on each path.

If the frequency of the selected transmission signal is a signal included in the first band B1, the first switching unit T110 provides the selected transmission signal to the first transmission signal processing unit T115, and the second band B2. The first switching unit T110 provides the selected transmission signal to the second transmission signal processing unit T125 when the signal is included in the signal, and the first switching unit T110 when the signal is included in the third band B3. The third transmission signal processor T135 is provided.

Here, each of the first to third transmission signal processing units T115, T125, and T135 may be implemented as a phase shifter, a high output amplifier, and a transmission filter. In this case, the phase shifter shifts the phase of the transmission signal to provide an electric beam steering function of the array antenna system when the reconstruction antenna structure 400 according to the fourth embodiment of the present invention is used as a unit element of the array antenna system. It has a role to control. The high power amplifier amplifies the phase shifted transmission signal by the phase shifter, and the transmission filter filters the amplified transmission signal. The transmission signal passing through the first transmission signal processing unit T115 among the first to third transmission signal processing units T115, T125, and 135 implemented as the phase shifter, the high output amplifier, and the transmission filter is the first transmission balun T120. ) Is entered. Here, the first transmission balun T120 converts the transmission signal into two balanced signals having the same amplitude, and serves to make the converted two balanced signals have a phase difference of 180 ° with each other.

Next, two transmission balance signals T11 and T12 output from the first transmission balun T120 are input to the first radiator 130, and the first radiator 130 is input to the two transmission signals ( T11, T12) is converted into electromagnetic wave form and radiated to the outside.

The reason why the first radiator 130 transmits two transmission signals having a phase difference of 180 ° from each other is that the beam is canceled by compensating each other that the beam pattern of the radiator is affected by other radiators formed on or below the beam. This is to prevent the pattern from deteriorating. That is, to provide a pattern correction function of the transmission signal.

Next, referring to FIG. 13 again, the signal reception process of the reconstruction antenna structure 400 according to the fourth embodiment of the present invention will be described.

The reception signals R11 and R12 received through the first radiator 130 are input to the first reception balun R120. Here, the two received signals R11 and R12 have the same amplitude with each other, but have 180 ° out of phase with each other. Then, the first reception balun R120 converts the two received signals R11 and R12 into one unbalanced signal, and converts the received unbalanced signal to the first received signal processor R115. to provide.

Here, the first reception signal processor R115 may be implemented as a reception filter, a low noise amplifier, and a phase shifter when the reconstruction antenna structure 400 according to the fourth embodiment of the present invention is used as a unit array element of a reception array antenna. In addition, the weak reception signal input from the first reception balun R120 may provide filtering, low noise amplification, and electric beam steering. The received signal passing through the first received signal processor R115 is input to the second switch R110. In addition, received signals received through the second radiator 140 and the third radiator 150 are also input to the second switching unit R110. Then, the second switching unit R110 selects only the reception signal indicated by the reception signal control data 40 and outputs the received signal to the reception output terminal 20. Here, the reason why the first radiator 130 receives two received signals having a phase difference of 180 ° from each other is that the first radiator 130 compensates each other that the beam pattern of the radiator is affected by other radiators formed at the top or the bottom thereof. This is to prevent the beam pattern from deteriorating. That is, to provide a pattern correction function of the received signal.

Meanwhile, when three input terminals are installed in place of the first switching unit T110 or three output terminals are installed in place of the second switching unit R110, the reconstructed antenna structures of the present invention simultaneously operate in three independent frequency bands. It can also be applied to a multi-band antenna structure that can operate.

14 is a conceptual diagram of a reconstruction antenna structure 500 according to a fifth embodiment of the present invention. Referring to FIG. 14, the reconstruction antenna structure 500 according to the fifth embodiment of the present disclosure includes a power supply unit 110, a ground plate 120, a first radiator 130, a second radiator 140, and a first radiator 140. Three emitters 151, 153. Here, the feed unit 110, the ground plate 120, the first radiator 130 and the second radiator 140 is a feed of the reconstruction antenna structure 100 according to the first embodiment of the present invention shown in FIG. Since all are the same components as the ground plate, the first radiator and the second radiator, the description thereof will be replaced with the above-described parts.

The third radiators 151 and 153 are formed on the first radiator 130 and are spaced apart from each other by the predetermined intervals on both sides of the second radiator 140. The third radiators 151 and 153 receive a transmission signal included in the third band B3 from the power supply unit 110 and convert the third radiators 151 and 153 into electromagnetic wave forms to radiate them. In addition, the third radiators 15 and 153 receive electromagnetic waves included in the third band B3, convert the electromagnetic waves into electrical signals, and provide the converted received signals to the power supply unit 110.

15A to 15D are front views, first perspective views, second perspective views, and bottom views of an example in which the reconstructed antenna structure 500 according to the fifth embodiment of the present invention is embodied. Here, FIG. 15A is a front view, FIG. 15B is a first perspective view, FIG. 15C is a second perspective view, and FIG. 15D is a bottom view.

Referring to FIGS. 15A through 15D, the first radiator 130 and the third radiators 151 and 153 are stacked microstrip patch antennas, and the second radiator 140 is a wideband quadrature dipole antenna. . The edge 160 of the ground plate 120 is bent in the direction of the first to third radiators 130, 140, and 150. In addition, the first to third radiators 130, 140, and 150 are connected to the ground plate 120 through the cylindrical pillar 135, and the ground plate 120 and the first radiator 130 may have an air strip structure. The third radiators 151 and 153 on the first radiator 130 form a stacked microstrip patch structure.

16A to 16C are a plan view, a front view, and a perspective view of another example of a reconfigured antenna structure 500 according to a fifth embodiment of the present invention. Here, FIG. 16A is a plan view, FIG. 16B is a front view, and FIG. 16C is a perspective view.

Referring to (a) to (c) of FIG. 16, another example of the reconstructed antenna structure 500 according to the fifth embodiment of the present invention includes a second radiator 140 having a second shape in FIG. 15. It is different from the radiator. That is, although the second radiator 140 shown in FIG. 16 has the same antenna structure as that of the second radiator structure shown in FIG. 15, a plurality of directivity elements, such as a multilayer circular conductor array structure, that can increase gain are stacked thereon. The difference is that it can be.

As such, the reconstructed antenna structures of the present invention shown in FIGS. 2 to 16 are structurally arranged such that the radiators of the low frequency band are disposed below and the radiators of the high frequency band are disposed above. Accordingly, the radiator disposed below may provide an electrical ground plane, a path for grounding, or provide a reflector role to the radiator disposed above. In addition, the problem that the radiation pattern characteristics such as the offset in the beam directing direction due to the mutual interference between the plurality of radiators is deteriorated by placing the excitation terminals of the respective radiators symmetrically.

FIG. 17 is a plan view of an array antenna designed and arranged by using reconfigured antenna structures according to an embodiment.

Referring to FIG. 17, an array antenna according to an embodiment of the present invention may include a first radiator for eight first bands B1, a second radiator for eight second bands B2, and eight third bands. It consists of a 3rd radiator for (B3). The first radiator is composed of a dual transmit / receive air strip radiating element, the second radiator is composed of a transmit / receive wideband cross dipole radiating element, and the third radiator is composed of a transmit / receive stacked multilayer microstrip radiating element. In addition, the unit antennas for the first band (B1) and the second band (B2) is composed of a reconstructed antenna structure shown in Figure 5, the unit antennas for the first band (B1) and third band (B3) is shown in FIG. It is composed of the shown reconstruction antenna structure.

The rear side of the array antenna (not shown) is used an 8-way power divider for combining or distributing the power of each unit antenna element. Here, the power divider preferably has a constant power distribution characteristic in order to obtain low side lobe characteristics.

In addition, a feeder (not shown) for controlling the signals transmitted and received through each reconstruction antenna structure is used as the array antenna. As described above with reference to FIG. 13, the power supply unit includes a transmission / reception switching unit, a transmission / reception processing unit, and a transmission / reception balun.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

1 is a view for explaining a mobile communication frequency band,

2 is a conceptual diagram of a reconstruction antenna structure according to the first embodiment of the present invention.

3 (a) to 3 (b) are a plan view and a front view when only the ground plate and the first radiator of the reconstructed antenna structure according to the first embodiment of the present invention are specified;

4 (a) to (d) are a plan view, a front view, a perspective view, and a bottom view of an example in which a power supply unit, a ground plate, and a first radiator of a reconstructed antenna structure according to the first embodiment of the present invention are embodied;

5 (a) to 5 (b) are a plan view and a front view of an example of a reconstruction antenna structure according to a first embodiment of the present invention;

6 (a) to 6 (c) are a front view, a perspective view and a bottom view of a reconstructed antenna structure according to the first embodiment of the present invention shown in (a) to (b) of FIG.

7 (a) to 7 (c) are a plan view, a front view, and a perspective view of another example of a reconstruction antenna structure according to the first embodiment of the present invention;

8 is a conceptual diagram of a reconstruction antenna structure according to a second embodiment of the present invention;

9 is a conceptual diagram of a reconstruction antenna structure according to a third embodiment of the present invention;

10 (a) to (b) are a plan view and a front view of an example of a reconstruction antenna structure according to a third embodiment of the present invention;

11 (a) to 11 (d) are a plan view, a front view, a perspective view and a bottom view of an example of a reconstructed antenna structure according to a third embodiment of the present invention;

12 is a conceptual diagram of a reconstruction antenna structure according to the fourth embodiment of the present invention;

13 is a block diagram illustrating a power supply unit for explaining an operation of a reconstruction antenna structure according to a fourth embodiment of the present invention;

14 is a conceptual diagram of a reconstruction antenna structure according to the fifth embodiment of the present invention;

15A to 15D are a front view, a first perspective view, a second perspective view, and a bottom view of an example in which a reconstructed antenna structure according to a fifth embodiment of the present invention is embodied;

16 (a) to 16 (c) are a plan view, a front view, and a perspective view of another example of a reconfigured antenna structure according to a fifth embodiment of the present invention;

FIG. 17 is a plan view of an array antenna designed and arranged by using reconfigured antenna structures according to an embodiment.

Claims (10)

In the antenna structure for frequency reconstruction, Ground plate, A first radiator formed on the ground plate and electrically connected to the ground plate and transmitting and receiving a signal of a first frequency band; A second radiator formed on the first radiator, the second radiator electrically using the first radiator as a ground plane or a reflection plane, and transmitting and receiving a signal of a second frequency band higher than the first frequency band; A power supply unit formed at an upper portion or a lower portion of the ground plate and providing a transmission signal to a radiator corresponding to a frequency to be transmitted, and receiving a signal through a radiator corresponding to a reception frequency; Including, the antenna structure. The method of claim 1, wherein the second radiator, And a plurality of second radiators are formed on the first radiator spaced apart from each other. The method of claim 1, And a third radiator formed on the second radiator and electrically connected to the second radiator, the third radiator transmitting and receiving a signal in a third frequency band higher than the second frequency band. The method of claim 1, A plurality of third radiators formed on the first radiator, electrically connected to the first radiator, spaced apart from the second radiator, and transmitting and receiving signals in a third frequency band higher than the second frequency band; Further comprising, an antenna structure. The method according to any one of claims 1 to 4, And the ground plate and the first radiator form an air strip structure. The method of claim 5, wherein the first radiator, An antenna structure comprising a two-terminal transmit excitation terminal and a two-terminal receive excitation terminal. The method of claim 5, wherein the second radiator, An antenna structure, which is a broadband cross dipole antenna structure. The said power supply part is a any one of Claims 1-4. Including a transmitter and a receiver, The transmitting unit, A transmission switching unit which selects a transmission signal indicated by predetermined transmission control data among a plurality of input transmission signals; A transmission signal processor for shifting a phase of the selected transmission signal, amplifying the modulated transmission signal, and filtering the amplified transmission signal; A transmission balun that converts the filtered transmission signal into two transmission balanced signals, The receiving unit, A reception balun for converting received signals received through the radiators into a single unbalanced signal; A received signal processor for filtering the converted received unbalanced signal, amplifying the filtered received unbalanced signal, and shifting a phase of the amplified received unbalanced signal; And a reception switching unit for selecting a reception signal indicated by predetermined reception control data among the reception signals output from the reception signal processing units. The method according to any one of claims 1 to 4, Wherein the edge of the ground plane is bent by a predetermined angle. The method according to any one of claims 1 to 4, And an interferer formed over the first radiator in a form surrounding the second radiator.

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