Patent Publication Number: US-9413070-B2

Title: Slot-type augmented antenna

Description:
TECHNICAL FIELD 
     The present invention relates to an augmented antenna capable of operating in a wider frequency band, receiving and reradiating radio signals and, more particularly, to an augmented antenna, obtained by forming radiation slot patterns using a plurality of radiation slots having multiple coupling regions, electromagnetically connecting the radiation slot patterns in a symmetrical manner and impedance-matching the radiation slot patterns. 
     BACKGROUND ART 
     Recently, a shadow area in which a propagation environment for wireless communication systems such as GSM/PCS/3G/4G is poor has been generated inside buildings as structures of high-story buildings and inner spaces thereof have become more complicated. Accordingly, technologies to solve this problem are needed. To improve propagation environments, a technology using a relay or a technology using a micro base station are used. 
     The technology using a relay improves propagation environments using two antennas and an active relay which is provided between the two antennas and uses a bidirectional amplification circuit or a passive relay which connects the two antennas through a coaxial cable or a waveguide. Specifically, an antenna is installed outside a building, in which a propagation environment is satisfactory, and connected to a waveguide or a coaxial cable and the waveguide or coaxial cable is connected to an antenna installed in a shadow area inside the building, thereby improving the propagation environment of the shadow area. 
     The technology using a micro base station improves the propagation environment and coverage of wireless communication using a micro base station such as a pico cell base station or a femto cell base station installed inside a building. 
     However, the technology using a relay or a micro base station requires high costs to solve ail shadow areas and needs new equipment for band expansion of wireless communication. Furthermore, an external propagation signal and a relayed internal propagation signal overlap in as inside area or a building, which is adjacent to glass windows. Terminals connected to the corresponding wireless communication system may be unintentionally exposed to multi-path fading doe to the aforementioned propagation signal overlap. 
     Accordingly, it is necessary to develop an antenna capable of contributing to expansion of the coverage of a wireless communication system without generating the aforementioned problem and operating in a wide frequency band. 
     The present invention has been made to satisfy the aforementioned technical requirements and solves the above-described problems and provides techniques that cannot be easily developed by a person skilled in the art. 
     DISCLOSURE 
     Technical Problem 
     Accordingly, the present invention has been made in view of the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an augmented antenna which simultaneously transmits and receives RF signals in a free space having a poor propagation environment to expand the coverage of a wireless communication system. 
     Another object of the present invention is to provide an augmented antenna for improving a propagation environment without exposing terminals to multi-path fading. 
     Still another object of the present invention is to provide an augmented antenna for improving a propagation environment at a low cost without increasing the number of relays and micro base stations. 
     Yet another object of the present invention is to provide an augmented antenna having a wide frequency bandwidth through multi-coupling induction. 
     Another object of the present invention is to provide an augmented antenna having en antenna pattern for propagation environment improvement, which is formed on a plane, to be applicable to various products in the form of a sheet or sticker. 
     Still another object of the present invention is to provide an augmented antenna having an antenna pattern for propagation environment improvement, which is formed on a metal plate according to perforation to be applicable to the surfaces of various products in the form of a sheet, sticker or metal plate. 
     Technical Solution 
     To accomplish the above objects, according to an embodiment of the present invention, there is provided an augmented antenna, including: a plurality of radiation slots formed in parallel on a substrate in order of resonant frequency and operating with positive signal components; and a plurality of radiation slots formed in parallel on the same substrate in order of resonant frequency and operating with negative signal components, the plurality of radiation slots operating with positive signal components and the plurality of radiation slots operating with negative signal components being arranged in the form of a slot dipole antenna. 
     The radiation slots operating with positive signal components say be formed at a predetermined interval and electromagnetically connected to form multiple coupling regions between neighboring radiation slots, and the radiation slots operating with negative signal components may be formed at a predetermined interval and electromagnetically connected to form multiple coupling regions between neighboring radiation slots. 
     The radiation slots operating with positive signal components and the radiation slots operating with negative signal components may be formed in a line on the basis of power feeders. 
     The radiation slots operating with positive signal components and the radiation slots operating with negative signal components may be formed in a V shape on the basis of power feeders. 
     The radiation slots operating with positive signal components may include: a first radiation slot operating with a positive signal component; a third radiation slot formed at a predetermined distance from the first radiation slot and having a resonant frequency higher than that of the first radiation slot; a fifth radiation slot formed next to the third radiation slot, at a predetermined distance from the third radiation slot, and having a resonant frequency higher than that of the third radiation slot; a seventh radiation slot foraged next to the fifth radiation slot, at a predetermined distance from the fifth radiation slot, and having a resonant frequency higher than that, of the fifth radiation slot; and a ninth radiation slot formed next to the seventh radiation slot, at a predetermined distance from the seventh radiation slot, and having a resonant frequency higher than that of the seventh radiation slot. 
     The radiation slots operating with negative signal components may include: a second radiation slot operating with a negative signal component; a fourth radiation slot formed at a predetermined distance from the second radiation slot and having a resonant frequency higher than that of the second radiation slot; a sixth radiation slot termed next to the fourth radiation slot, at a predetermined distance from the fourth radiation slot, and having a resonant frequency higher than that of the fourth radiation slot; an eighth radiation slot formed next to the sixth radiation slot, at a predetermined distance from the sixth radiation slot, and having a resonant frequency higher than that of the sixth radiation slot; and a tenth radiation slot formed next to the eighth radiation slot, at a predetermined distance from the eighth radiation slot, and having a resonant frequency higher than that of the eighth radiation slot. 
     The radiation slots operating with positive signal components and the radiation slots operating with negative signal components may be formed in a V shape on the basis of power feeders to form a radiation slot pattern, wherein two radiation slot patterns are disposed such that ends of power feeders thereof are connected to each other to form an antenna pattern, the two radiation slot patterns being symmetrical. 
     The power feeders may be impedance-matched and electromagnetically connected to each other. 
     The two radiation slot patterns may include a first radiation slot pattern and a second radiation slot pattern, wherein a power feeder of the first radiation slot pattern, with respect to positive signal components, and a power feeder of the second radiation slot pattern, with respect to negative signal components, are impedance-matched and electromagnetically connected to each other, and a power feeder of the first radiation slot pattern, with respect to negative signal components, and a power feeder of the second radiation slot pattern, with respect to positive signal components, are impedance-matched and electromagnetically connected to each other. 
     The radiation slots operating with positive signal components and the radiation slots operating with negative signal components may be formed in a V shape on the basis of the power feeders to form a radiation slot pattern, wherein foot radiation slot patterns are disposed such that ends of power feeders thereof are connected to form an antenna pattern, the four radiation slot patterns and opposite radiation slot patterns thereof being symmetrical. 
     The power feeders may be impedance-matched and electromagnetically connected. 
     The four radiation slot patterns may include a first radiation slot pattern, a second radiation slot pattern, a third radiation slot pattern and a fourth radiation slot pattern, wherein a power feeder of the first radiation slot pattern, with respect to positive signal components, and a power feeder of the fourth radiation slot pattern, with respect to negative signal components, are impedance-matched and electromagnetically connected to each other, a power feeder of the second radiation slot pattern, with respect to positive signal components, and a power feeder of the first radiation slot pattern, with respect to negative signal components, are impedance-matched and electromagnetically connected to each other, a power feeder of the third radiation slot pattern, with respect to positive signal components, and a power feeder of the second radiation slot pattern, with respect to negative signal components, are impedance-matched and electromagnetically connected to each other, and a power feeder of the fourth radiation slot pattern, with respect to positive signal components, and a power feeder of the third radiation slot pattern, with respect to negative signal components, are impedance-matched and electromagnetically connected to each other. 
     The radiation slots operating with positive signal components and the radiation slots operating with negative signal components may be formed on a substrate disposed on one side of a dielectric layer. 
     The dielectric layer may be a PCB. 
     The material of the substrate may be a metal, polysilicon, ceramic, carbon fiber, conductive ink, conductive paste, ITO (Indium Tin Oxide), CNT (carbon Nano Tube) or conductive polymer. 
     The substrate on which the radiation slots operating with positive signal components and the radiation slots operating with negative signal components are formed may be a metal layer. 
     The metal layer may be a metal plate. 
     The metal plate may be formed on the surface of electronics. 
     Advantageous Effects 
     An augmented antenna according to an embodiment of the present invention can simultaneously transmit and receive RF signals in a free apace having a poor propagation environment to contribute to expansion of the coverage of a wireless communication system. 
     An augmented antenna according to an embodiment of the present invention can improve propagation environment without exposing terminals to multi-path fading. 
     An augmented antenna according to an embodiment of the present invention can improve a propagation environment at a low cost without increasing the number of relays and micro base stations. 
     An augmented antenna according to an embodiment of the present invention can reradiate radio waves in a wide frequency bandwidth through multi-coupling induction. Accordingly, propagation environment can be improved in a wide frequency band. 
     In addition, an augmented antenna according to an embodiment of the present invention can be formed in such a manner that an antenna pattern for propagation environment improvement is formed flat on a dielectric layer. Accordingly, the augmented antenna can be manufactured in the form or a sheet or sticker and applied to various products to improve the propagation environment. 
     Furthermore, an augmented antenna according to an embodiment of the present invention can be formed in such a manner that an antenna pattern for propagation environment improvement is formed on a metal plate according to perforation. Accordingly, the augmented antenna can be manufactured in the form of a sheet, sticker or metal plate and applied to various products to improve propagation environment. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIGS. 1 ( a ) and ( b )  illustrates a configuration of a linear radiation slot pattern included in an augmented antenna according to an embodiment of the present invention. 
         FIG. 2  is a graph showing reflection coefficient characteristics of a linear single slot dipole antenna. 
         FIG. 3  is a graph showing reflection coefficient characteristics of the linear radiation slot pattern included in the augmented antenna according to an embodiment of the present invention. 
         FIGS. 4 ( a ) and ( b )  illustrates a configuration of a V-shaped radiation slot pattern included in an augmented antenna according to an embodiment of the present invention. 
         FIG. 5  is a graph showing reflection coefficient characteristics of a V-shaped single slot dipole antenna. 
         FIG. 6  is a graph showing reflection coefficient characteristics of the V-shaped radiation slot pattern included in the augmented antenna according to an embodiment of the present invention. 
         FIGS. 7 ( a ) and ( b )  illustrates a configuration of a double augmented antenna according to an embodiment of the present invention. 
         FIG. 8  is a graph showing reflection coefficient and transfer coefficient characteristics of the double augmented antenna according to an embodiment of the present invention. 
         FIG. 9  shows propagation and radiation characteristics of the double augmented antenna according to an embodiment of the present invention. 
         FIGS. 10 ( a ) and ( b )  illustrates a configuration of a quadruple augmented antenna according to an embodiment of the present invention. 
         FIGS. 11, 12  ( a ) and (b) and  13  ( a ) and ( b ) are graphs showing reflection coefficient characteristics of the quadruple augmented antenna according to an embodiment of the present invention. 
         FIGS. 14 and 15  ( a )-( c ) are graphs showing transfer coefficient characteristics of the quadruple augmented antenna according to an embodiment of the present invention. 
         FIG. 16  shows propagation and radiation characteristics of the quadruple augmented antenna according to an embodiment of the present invention. 
         FIG. 17  illustrates a quadruple augmented antenna implemented on a dielectric layer according to an embodiment of the present invention. 
     
    
    
     BEST MODE FOR INVENTION 
     An augmented antenna according to the present invention will be described in detail through preferred embodiments with reference to the accompanying drawings so that the present invention can be easily understood and realized by those skilled in the art. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The accompanying drawings illustrate exemplary embodiments of the present invention end provide a more detailed description of the present invention. However, the scope of the present invention should not be limited thereto. 
     A description will be given of a linear radiation slot pattern, which may be included in an augmented antenna according to an embodiment of the present invention with reference to  FIGS. 1, 2 and 3 . 
     Referring to  FIG. 1 , the linear radiation slot pattern  110  which may be included in the augmented antenna according to an embodiment of the present invention may include a plural icy of radiation slots  113 ,  115 ,  117 ,  119  and  121  which are formed on a substrate in order of resonant frequency and operate with positive signal components, and a plurality of radiation slots  114 ,  116 ,  118 ,  120  and  122  which are formed on the same substrate to constitute a slot dipole antenna with the radiation slots operating with positive signal components, are arranged in order of resonant frequency and operate with negative signal components. 
     The radiation slots  113 ,  115 ,  117 ,  119  and  121  operating with positive signal components are formed in parallel on the substrate in order of resonant frequency and arranged in a line with the radiation slots  114 ,  116 ,  118 ,  120  and  122  operating with negative signal, components. The radiation slots  113 ,  115 ,  117 ,  119  and  121  and the radiation slots  114 ,  116 ,  118 ,  120  and  122  are arranged in the form of a slot dipole antenna. 
     The radiation slots  113 ,  111 ,  117 ,  119  and  121  operating with positive signal components are formed at a predetermined interval and electromagnetically connected to a power feeder  111 , and thus multi-coupling regions  123 ,  124 ,  125  and  126  are formed between neighboring radiation slots. 
     In addition, the radiation slots  113 ,  115 ,  117 ,  119  and  121  operating with positive signal components respectively have sequentially increasing resonant frequencies. Specifically, the radiation slots  113 ,  115 ,  117 ,  119  and  121  stay include the first radiation slot  113  operating with a positive signal component, the third radiation slot  115  which is formed at a predetermined distance free the first radiation slot and has a resonant frequency higher than that of the first radiation slot, the fifth radiation slot  117  which is formed nest to the third radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the third radiation slot, the seventh radiation slot  119  which is formed next to the fifth radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the fifth radiation slot, and the ninth radiation slot  121  which is formed next to the seventh radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the seventh radiation slot. 
     The radiation slots  114 ,  116 ,  118 ,  120  and  122  operating with negative signal components are formed in parallel on the substrate in order of resonant frequency and arranged, in a line with the radiation slots  113 ,  115 ,  117 ,  119  and  121  operating with positive signal components. The radiation slots  114 ,  116 ,  118 ,  120  and  122  and the radiation slots  113 ,  115 ,  117 ,  110  and  121  are arranged in the form of a slot dipole antenna. 
     The radiation slots  114 ,  116 ,  118 ,  120  and  122  operating with negative signal components are formed at a predetermined interval and electromagnetically connected to a power feeder  112 , and thus multiple coupling regions  127 ,  128 ,  129  and  130  are formed between neighboring radiation slots. 
     In addition, the radiation slots  114 ,  116 ,  118 ,  120  and  122  operating with positive signal components respectively have sequentially increasing resonant frequencies. Specifically, the radiation slots  114 ,  116 ,  118 ,  120  and  122  may include the second radiation slot  114  operating with a negative signal component, the fourth radiation slot  116  which is formed at a predetermined distance from the second radiation slot and has a resonant frequency higher than that of the second radiation slot, the sixth radiation slot  118  which is formed next to too fourth radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the fourth radiation slot, the eighth radiation slot  120  which is formed next to the sixth radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the sixth radiation slot, and the tenth radiation slot  122  which is formed next to the eighth radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the eighth radiation slot. 
     While the five radiation slots operating with positive signal components and the five radiation slots operating with negative signal components are shown in  FIG. 1 , the number of radiation slots is not limited to five and the radiation slot pattern may be formed in various manners using two or more radiation slots. 
     The linear radiation slot pattern  110  that may be included in the augmented antenna according to an embodiment of the present invention will now be described in more detail with reference to  FIG. 1 . The first radiation slot  113  operating with a positive signal component and the second radiation slot  114  operating with a negative signal component are formed in a line on oho basis of the power feeders  111  and  112 . The third radiation slot  115  having a resonant frequency higher than that of the first radiation slot  113  is formed at a predetermined distance from the first radiation slot  113  and electromagnetically connected to the first radiation slot  113  to form the proximity coupling region  123 . The fourth radiation slot  116  having a resonant frequency higher than that of the second radiation slot  114  is formed at a predetermined distance from the second radiation slot  114  and electromagnetically connected to the second radiation slot  114  to form the proximity coupling region  127 . 
     The fifth radiation slot  117  having a resonant frequency higher than that of the third radiation slot  115  is formed at a predetermined distance from the third radiation slot  115  and electromagnetically connected to the third radiation slot  115  to form the proximity coupling region  124 . The sixth radiation slot  118  having a resonant frequency higher than that of the fourth radiation slot  116  is formed at a predetermined distance from the fourth radiation slot  116  and electromagnetically connected to the fourth radiation slot  116  to form the proximity coupling region  128 . 
     The seventh radiation slot  119  having a resonant frequency higher than that of the fifth radiation slot  117  is formed at a predetermined distance from the fifth radiation slot  117  and electromagnetically connected to the fifth radiation slot  117  to form the proximity coupling region  125 . The eighth radiation slot  120  having a resonant frequency higher than that of the sixth radiation slot  118  is formed at a predetermined distance from the sixth radiation, slot  118  and electromagnetically connected to the sixth radiation slot  118  to form the proximity coupling region  129 . 
     In addition, the ninth radiation slot  121  having a resonant frequency higher than that of the seventh radiation slot  119  is formed at a predetermined distance from the seventh radiation slot  119  and electromagnetically connected to the seventh radiation slot  119  to form the proximity coupling region  126 . The tenth radiation slot  122  having a resonant frequency higher than that of the eighth radiation slot  120  is formed at a predetermined distance from the eighth radiation slot  120  and electromagnetically connected to the eighth radiation slot  120  to form the proximity coupling region  130 . 
     The linear radiation slot pattern  110  that may be included in the augmented antenna according to an embodiment of the present invention has the following characteristics. As shown in  FIG. 3 , reflection coefficient S 11  of less than −10 dB of the radiation slot of pattern  110  corresponds to a bandwidth of 400 MHz ranging from 2.2 GHz to 2.6 GHz. Such bandwidth is double the bandwidth of a single slot dipole antenna pattern  100  shown in  FIG. 2 . Such bandwidth improvement is achieved according to multi-coupling obtained by the radiation slots of the radiation slot pattern  110 . 
     A description will be given of a V-shaped radiation slot pattern which may be included in the augmented antenna according to an embodiment of the present invention with reference to  FIGS. 4, 5 and 6 . 
     Referring to  FIG. 4 , the V-shaped radiation slot pattern  210  which may be included in the augmented antenna according to an embodiment of the present invention may include a plurality of radiation slots  213 ,  215 ,  217 ,  219  and  221  which are formed on a substrate in order of resonant frequency and operate with positive signal components, and a plurality of radiation slots  214 ,  216 ,  218 ,  220  and  222  which are formed on the same substrate to constitute a slot dipole antenna with the radiation slots operating with positive signal components, are arranged in order of resonant frequency and operate with negative signal components. 
     Here, while the radiation slot pattern  210  may be formed in various V shapes, the V-shape radiation slot pattern  210  is preferably formed in a V shape having a right angle between two sides thereof. Precisely, the radiation slots do not form a V shape having a right angle between two sides thereof. Rather, extension lines of the radiation slots in the length direction can form a V shape having a right angle between two sides thereof. 
     The radiation slots  213 ,  215 ,  217 ,  219  and  221  operating with positive signal components are formed in parallel on the substrate in order of resonant frequency. The radiation slots  213 ,  215 ,  217 ,  219  and  221  and the radiation slots  214 ,  216 ,  218 ,  220  and  222  are arranged in the form of a slot dipole antenna in a V shape. 
     The radiation slots  213 ,  215 ,  217 ,  219  and  221  operating with positive signal components are formed at a predetermined interval and electromagnetically connected to a power feeder  211 , and thus multiple coupling regions  223 ,  224 ,  225  and  226  are formed between neighboring radiation slots. 
     In addition, the radiation slots  213 ,  215 ,  217 ,  219  and  221  operating with positive signal components respectively have sequentially increasing resonant frequencies. Specifically, the radiation slots  213 ,  215 ,  217 ,  219  and  221  may include the first radiation slot  213  operating with a positive signal component, the third radiation slot  215  which is formed at a predetermined distance from the first radiation slot and has a resonant frequency higher than that of the first radiation slot, the fifth radiation slot  217  which is formed next to the third radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the third radiation slot, the seventh radiation slot  219  which is formed next to the fifth radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the fifth radiation slot, and the ninth radiation slot  221  which is formed next to the seventh radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the seventh radiation slot. 
     The radiation slots  214 ,  216 ,  218 ,  220  and  222  operating with negative signal components are formed in parallel on the substrate in order of resonant frequency. The radiation slots  214 ,  216 ,  218 ,  220  and  222  and the radiation slots  213 ,  215 ,  217 ,  219  and  221  are arranged in the form of a slot dipole antenna in a V shape. 
     The radiation slots  214 ,  216 ,  218 ,  220  and  222  operating with negative signal components are formed at a predetermined interval and electromagnetically connected to a power feeder  212 , and thus multiple coupling regions  227 ,  228 ,  229  and  230  are formed between neighboring radiation slots. 
     In addition, the radiation slots  214 ,  216 ,  218 ,  220  and  222  operating with positive signal components respectively have sequentially increasing resonant frequencies. Specifically, the radiation slots  214 ,  216 ,  218 ,  220  and  222  may include the second radiation slot  214  operating with a negative signal component, the fourth radiation slot  216  which is formed at a predetermined distance from the second radiation slot and has a resonant frequency higher than that of the second radiation slot, the sixth radiation slot  218  which is formed next so the fourth radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the fourth radiation slot, the eighth radiation slot  220  which is formed next to the sixth radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the sixth radiation slot, and the tenth radiation slot  222  which is formed next to the eighth radiation slot, at a predetermined distance therefrom, and has a resonant frequency higher than that of the eighth radiation slot. 
     While the five radiation slots operating with positive signal components and the five radiation slots operating with negative signal components are shown in  FIG. 4 , the number of radiation slots is not limited to five and the radiation slot pattern may be formed in various manners using two or more radiation slots. 
     The V-shaped radiation slot pattern  210  that may be included in the augmented antenna according to an embodiment of the present invention will now be described in more detail with reference to  FIG. 4 . The first radiation slot  213  operating with a positive signal component and the second radiation slot  214  operating with a negative signal component are perpendicular to each other on the basis of the power feeders  211  and  212 . The third radiation slot  215  having a resonant frequency higher than that of the first radiation slot  213  is formed at a predetermined distance from the first radiation slot  213  and electromagnetically connected to the first radiation slot  213  to form the proximity coupling region  223 . The fourth radiation slot  216  having a resonant frequency higher than that of the second: radiation slot  214  is formed at a predetermined distance from the second radiation slot  214  and electromagnetically connected to the second radiation slot  214  to form the proximity coupling region  227 . 
     The fifth radiation slot  217  having a resonant frequency higher than that of the third radiation slot  215  is formed at a predetermined distance from the third radiation slot  215  and electromagnetically connected to the third radiation slot  215  to form the proximity coupling region  224 . The sixth radiation slot  218  having a resonant frequency higher than that of the fourth radiation slot  215  is formed at a predetermined distance from the fourth radiation slot  216  and electromagnetically connected to the fourth radiation slot  216  to form the proximity coupling region  228 . 
     The seventh radiation slot  219  having a resonant frequency higher than that of the fifth radiation slot  217  is formed at a predetermined distance from the fifth radiation slot  217  and electromagnetically connected to the fifth radiation slot  217  to form the proximity coupling region  225 . The eighth radiation slot  220  having a resonant frequency higher than that of the sixth radiation slot  218  is formed at a predetermined distance from the sixth radiation slot  218  and electromagnetically connected to the sixth radiation slot  218  to form the proximity coupling region  229 . 
     In addition, the ninth radiation slot  221  having a resonant frequency higher than that of one seventh radiation slot  219  is formed at a predetermined distance from the seventh radiation slot  219  and electromagnetically connected to the seventh radiation slot  219  to form the proximity coupling region  226 . The tenth radiation slot  222  having a resonant frequency higher than that of the eighth radiation slot  220  is formed at a predetermined distance from the eighth radiation slot  220  and electromagnetically connected to the eighth radiation slot  220  to form the proximity coupling region  230 . 
     The V-shaped radiation slot pattern  210  that may be included in the augmented antenna according to an embodiment of the present invention has the following characteristics. As shown in  FIG. 6 , reflection coefficient S 11  of less than −10 dB of the radiation slot pattern  210  corresponds to a bandwidth of 400 MHZ ranging from 2.2 GHz to 2.6 GHz. Such bandwidth is double the bandwidth of a V-shaped single slot dipole antenna pattern  200 , shown in  FIG. 5 . Such bandwidth improvement is achieved according to multi-coupling obtained by the radiation slots of the radiation slot pattern  210 . 
     A description will be given of a double augmented antenna according to an embodiment of the present invention with reference to  FIGS. 7, 8 and 9 . 
     Referring to  FIG. 7 , the double augmented antenna  310  according to an embodiment of the present invention may include two radiation slot patterns  311  and  112  which are symmetrically formed in such a manner that ends of power feeders thereof are connected to each other. 
     Each of the radiation slot patterns  311  and  312  may include a plurality of radiation slots operating with positive signal components and a plurality of radiation patterns operating with negative signal components, which are formed in a V shape on the basis of the power feeders. The radiation slot patterns  311  and  312  face each other in a symmetrical form on one basis of the power feeders and are electromagnetically connected to each other to form the double augmented antenna. While the double augmented antenna may be formed in various V shapes, the double augmented antenna is preferably formed in a V shape having a right angle between two sides thereof (precisely, the radiation slots do not form a V shape having a right angle between two sides thereof, and extension lines of the radiation slots in the length direction can form a V shape having a right angle between two sides thereof). 
     After formation of the two radiation slot patterns  311  and  312  in a symmetrical form, the radiation slot patterns  311  and  312  are electromagnetically connected to each other according to electromagnetic connection of the power feeders thereof. The power feeders are preferably connected to each other while being impedance-matched. Specifically, the power feeder of the first radiation slot pattern  311 , which relates to positive signal components, and the power feeder of the second radiation slot pattern  312 , which relates to negative signal components, are preferably impedance-matched and electromagnetically connected to each other ( 333 ), and the power feeder of the first radiation slot pattern  311 , which relates to negative signal components, and the power feeder of the second radiation slot pattern  312 , which relates to positive signal components, are preferably impedance-matched and electromagnetically connected to each other ( 334 ). 
     In addition, the two radiation slot patterns  311  and  312  are preferably formed on a substrate disposed on one side of a dielectric layer. Here, the dielectric layer may be a PCB. 
     The substrate on which the radiation slot patterns  311  and  312  are formed may be made of various materials. Preferably, the substrate may be formed of a metal, polysilicon, ceramic, carbon fiber, conductive ink, conductive paste, ITO (Indium Tin Oxide), CNT (Carbon Nano Tube) or conductive polymer. 
     When the radiation slot patterns  311  and  312  are formed on a metal layer, the metal layer is preferably formed from a metal plate. The radiation slot patterns  311  and  312  can be formed on the metal plate and applied to the surfaces of various products. Accordingly, the radiation slot patterns  311  and  312  can be applied to the surface of electronics made of a metal to improve propagation environment around the electronics. 
     The double augmented antenna according to an embodiment of the present invention will now be described in more detail with reference to  FIG. 7 . The double augmented antenna is formed in a symmetrical form on the basis of the power feeders  333  and  334  and may include the two radiation slot patterns  311  and  312  which are impedance-matched and reradiate radio waves. 
     The first radiation slot pattern  311  may include a radiation pattern  313  operating with a positive signal component and a radiation slot  318  which is perpendicular to the radiation slot  313  on the basis of the power feeders and operates with a negative signal component. In addition, a plurality of radiation slots  314 ,  315 ,  316  and  317  respectively having sequentially increasing resonant frequencies, which are higher than the resonant frequency of the radiation slot  313 , are sequentially formed next to the radiation slot  313  at a predetermined interval and electromagnetically connected. A plurality of radiation slots  319 ,  320 ,  321  and  322  respectively having sequentially increasing resonant frequencies, which are higher than the resonant frequency of the radiation slot  318 , are sequentially formed next to the radiation slot  318  at a predetermined interval and electromagnetically connected. 
     The second radiation slot of pattern  312  may include a radiation pattern  338  operating with a positive signal component and a radiation slot  323  which is perpendicular to the radiation slot  328  on the basis of the power feeders and operates with a negative signal component. In addition, a plurality of radiation slots  329 ,  330 ,  331  and  332  respectively having sequentially increasing resonant frequencies, which are higher than the resonant frequency of the radiation slot  328 , are sequentially formed next to the radiation slot  328  at a predetermined interval and electromagnetically connected. A plurality of radiation slots  324 ,  325 ,  326  and  327  respectively having sequentially increasing resonant frequencies, which are higher than the resonant frequency of the radiation slot  323 , are sequentially formed next to the radiation slot  323  at a predetermined interval and electromagnetically connected. 
     The first radiation slot pattern  311  and the second radiation slot pattern  312  are connected to each other in such a manner that one end of the power feeders  333  and  334  of the first radiation slot pattern  311  and one end of the power feeders  333  and  334  of the second radiation slot pattern  312  are connected to each other in a symmetrical form, impedance-matched and electromagnetically connected to each other. 
     Since the double augmented antenna can receive radio waves in a wide frequency band and reradiate the radio waves, the double augmented antenna can be used to improve the propagation environment of a wireless communication system and extend the coverage thereof according to such characteristics. 
     Specifically, a radio signal received by the first radio slot pattern  311  included in the double augmented antenna is transmitted to the second radiation slot pattern  312  with maximum efficiency according to impedance matching and radiated and, simultaneously, a radio signal received by the second radiation slot pattern  312  is transmitted to the first radiation slot pattern  311  with maximum efficiency according to impedance matching and radiated. Accordingly, a radio signal can be received and reradiated with maximum efficiency according to impedance matching to augment waves around the augmented antenna. 
     Referring to  FIG. 8 , reflection coefficient S 11  and transfer coefficient S 21  at the power feeders  333  and  334  with respect to the first radiation slot pattern  311  and the second radiation slot pattern  312  of the double augmented antenna  310  can be confirmed. Referring to  FIG. 9 , the form of a radio wave radiated from the double augmented antenna  310  can be confirmed. 
     As described above, since the double augmented antenna  310  according to an embodiment of the present invention forms multiple coupling regions using a plurality of radiation slots, the double augmented antenna  310  can transmit and receive radio signals in a wider bandwidth than an antenna pattern  300  shown in the upper part of  FIG. 7 , thereby improving propagation environments. 
     A description will be given of a quadruple augmented antenna according to an embodiment of the present invention with reference to  FIG. 10 to 17 . 
     Referring to  FIGS. 10 to 17 , the quadruple augmented antenna  410  according to an embodiment of the present invention may include four radiation slot patterns  421 ,  422 ,  423  and  424  which are symmetrically formed in such a manner that ends of power feeders thereof are connected. 
     Each of the four radiation slot patterns  421 ,  422 ,  423  and  424  may include a plurality of radiation slots operating with positive signal components and a plurality of radiation patterns operating with negative signal components, which are formed in a V shape on the basis of the power feeders. The four radiation slot patterns  421 ,  422 ,  423  and  424  are symmetrically formed on the basis of the power feeders and electromagnetically connected to form the quadruple augmented antenna. While the quadruple augmented antenna may be formed in various V shapes, the quadruple augmented antenna is preferably formed in a V shape having a right angle between two sides thereof (precisely, the radiation slots do not form a V shape having a right angle between two sides thereof, and extension lines of the radiation slots in the length direction can form a V shape having a right angle between two sides thereof). 
     The four radiation slot patterns  421 ,  422 ,  423  and  424  are symmetrically formed with the vortexes of the v shapes thereof gathered at the center of the quadruple augmented antenna  410 . In this case, one radiation slot pattern and a radiation slot pattern opposite thereto are symmetrical, and one radiation slot pattern and each of radiation slot patterns arranged on both sides thereof are symmetrical. Accordingly, when the V shape of each radiation pattern has a right angle between two sides thereof, the four radiation slot patterns can be arranged in the form of a cross or X according to the aforementioned symmetrical formation, as shown in  FIG. 10 . 
     After formation of the four radiation slot patterns  421 ,  422 ,  423  and  424  in a symmetrical form, the radiation slot patterns  421 ,  422 ,  423  and  424  are electromagnetically connected according to electromagnetic connection of the power feeders thereof. The power feeders are preferably connected while being impedance-matched. Specifically, the power feeder of the first radiation slot pattern  421 , which relates to positive signal components, and the power feeder of the fourth radiation, slot pattern  424 , which relates to negative signal components, are preferably impedance-matched and electromagnetically connected to each other ( 474 ), and the power feeder of the second radiation slot pattern  422 , which relates to positive signal components, and the power feeder of the first radiation slot pattern  421 , which relates to negative signal components, are preferably impedance-matched and electromagnetically connected to each other ( 471 ). In addition, the power feeder of the third radiation slot pattern  423 , which relates to positive signal components, and the power feeder of the second radiation slot pattern  422 , which relates to negative signal components, are preferably impedance-matched and electromagnetically connected to each other ( 472 ), and the power feeder of the fourth radiation slot pattern  424 , which relates to positive signal components, and the power feeder of the third radiation slot pattern  423 , which relates to negative signal, components, are preferably impedance-matched and electromagnetically connected to each other ( 473 ). 
     In addition, the four radiation slot pattern  421 ,  422 ,  423  and  424  are preferably formed on a substrate disposed on one side of a dielectric layer. Here, the dielectric layer may be a PCB. 
     The substrate on which the radiation slot patterns  421 ,  422 ,  423  and  424  are formed may be made of various materials. Preferably, the substrate may be formed of a metal, polysilicon, ceramic, carbon fiber, conductive ink, conductive paste, ITO (Indium Tin Oxide), CNT (Carbon Nano Tube) or conductive polymer. 
     When the radiation slot patterns  421 ,  422 ,  423  and  424  are formed on a metal layer, the metal layer is preferably formed from a metal plate. The radiation slot patterns  421 ,  422 ,  423  and  424  are formed on the metal plate and applied to the surfaces of various products. Accordingly, the radiation slot patterns  421 ,  422 ,  423  and  424  can be applied to the surface of electronics made of a metal to improve propagation environment around the electronics. 
     The quadruple augmented antenna according to an embodiment of the present invention will now be described in more detail with reference to  FIG. 10 . The quadruple augmented, antenna has a symmetrical form on the basis of the power feeders  471 ,  472 ,  473  and  474  and may include the four radiation slot patterns  421 ,  422 ,  423  and  424  which are impedance-matched and reradiate radio waves. 
     The first radiation slot pattern  421  may include a radiation pattern  466  operating with a positive signal component and a radiation slot  430  which is perpendicular to the radiation slot  466  on the basis of the power feeders and operates with a negative signal component. In addition, a plurality of radiation slots  467 ,  468 ,  469  and  470  respectively having sequentially increasing resonant frequencies, which are higher than the resonant frequency of the radiation slot  466 , are sequentially formed next to the radiation slot  466  at a predetermined interval and electromagnetically connected. A plurality of radiation slots  431 ,  432 ,  433  and  434  respectively having sequentially increasing resonant frequencies, which are higher than the resonant frequency of the radiation slot  430 , are sequentially formed next to the radiation slot  430  at a predetermined interval and electromagnetically connected. 
     The second radiation slot pattern  422  may include a radiation pattern.  435  operating with a positive signal component and a radiation slot  440  which is perpendicular to the radiation slot  433  on the basis of the power feeders and operates with a negative signal component. In addition, a plurality of radiation slots  436 ,  437 ,  438  and  439  respectively having sequentially increasing resonant frequencies, which are higher than the resonant frequency of the radiation slot  435 , are sequentially formed next to the radiation slot  435  at a predetermined interval and electromagnetically connected. A plurality of radiation slots  441 ,  442 ,  443  and  444  respectively having sequentially increasing resonant frequencies, which are higher than one resonant frequency of the radiation slot  440 , are sequentially formed next to the radiation slot  440  at a predetermined interval and electromagnetically connected. 
     The third radiation slot pattern  423  may include a radiation pattern  445  operating with a positive signal component and a radiation slot  450  which is perpendicular to the radiation slot  445  on the basis of the power feeders and operates with a negative signal component. In addition, a plurality of radiation slots  446 ,  447 ,  448  and  449  respectively having sequentially increasing resonant frequencies, which are higher then the resonant frequency of the radiation slot  445 , are sequentially formed next to the radiation slot  445  at a predetermined interval and electromagnetically connected. A plurality of radiation slots  451 ,  452 ,  453  and  454  respectively having sequentially increasing resonant frequencies, which are higher than the resonant frequency of the radiation slot  450 , are sequentially formed next to the radiation slot  450  at a predetermined interval and electromagnetically connected. 
     The fourth radiation slot pattern  424  may include a radiation pattern  456  operating with a positive signal component and a radiation slot  461  which is perpendicular to the radiation slot  456  on the basis of the power feeders and operates with a negative signal component. In addition, a plurality of radiation slots  457 ,  458 ,  459  and  460  respectively having sequentially increasing resonant frequencies, which are higher than the resonant frequency of the radiation slot  456 , are sequentially formed next to the radiation slot  456  at a predetermined interval and electromagnetically connected. A plurality of radiation slots  462 ,  463 ,  464  and  465  respectively having sequentially increasing resonant frequencies, which are higher than the resonant frequency of the radiation slot  461 , are sequentially formed next to the radiation slot  461  at a predetermined interval and electromagnetically connected. 
     The first to fourth radiation slot patterns  421 ,  422 ,  423  and  424  are symmetrically formed with the vortexes of the V shapes thereof gathered at the center of the quadruple augmented antenna. In this case, one radiation slot pattern and a radiation slot patters opposite thereto are symmetrical, and one radiation slot pattern and each of radiation slot patterns arranged on both sides thereof are symmetrical. For example, the first radiation slot pattern  421  and the third radiation slot pattern  423 , which is formed opposite to the first radiation slot pattern  421  on the basis of the power feeders, are symmetrical. In addition, the first radiation slot pattern  421  and each of the second and fourth radiation slot patterns  422  and  424  formed on both sides of the first radiation slot pattern  421  are symmetrical. Accordingly, when the V shape of each radiation pattern has a right angle between two sides thereof, the four radiation slot patterns can be arranged in the form of a cross or X according to the aforementioned symmetrical formation, as shown in  FIG. 10 . 
     Since the quadruple augmented antenna can receive radio waves in a wide frequency band and reradiate the radio waves, the quadruple augmented antenna can be used to improve the propagation environment of a wireless communication system and extend the coverage thereof according to such characteristics. 
     Specifically, a radio signal received by the first radio slot pattern  421  is transmitted to the third radiation slot pattern  423  with maximum efficiency according to impedance matching and radiated and, simultaneously, a radio signal received by the third radiation, slot pattern  423  is transmitted to the first radiation slot pattern  421  with maximum efficiency according to impedance matching and radiated. A radio signal received by the second radiation slot pattern  422  is transmitted to the fourth radiation slot pattern  424  with maximum efficiency according to impedance matching and radiated and, simultaneously, a radio signal received by the fourth radiation slot pattern  424  is transmitted to the second radiation slot pattern  422  with maximum efficiency according to impedance matching and radiated. 
     Radio signals received through the first, second, third and fourth radiation slot patterns  421 ,  422 ,  423  and  424  may be applied to not only opposite radiation slot patterns but also neighboring radiation slot patterns on both sides of the radiation slot patterns. Part of a radio signal received by the first radiation slot pattern  421  is applied to the second and fourth radiation slot patterns  422  and  424  and radiated therefrom and part of a radio signal received by the second radiation slot pattern  422  is applied to the first and third radiation clot patterns  421  and  423  and radiated therefrom. In addition, part of a radio signal received by the third radiation slot pattern  423  is applied to the second and fourth radiation slot patterns  422  and  424  and radiated therefrom and part of a radio signal received by the fourth radiation slot pattern  424  is applied to the first and third radiation slot patterns  421  and  423  and radiated therefrom. 
     Consequently, the quadruple augmented antenna receives radio signals and reradiates the radio signals with maximum efficiency according to impedance matching through the aforementioned process, to thereby augment waves around the augmented antenna. 
     Referring to  FIGS. 11, 12 and 13 , reflection coefficients S 11 , S 22 , S 33  and S 44  respectively at the power feeders  471  and  474 , the power feeders  471  and  472 , the power feeders  472  and  473  and the power feeders  473  and  474  with respect to the first, second, third and fourth radiation slot patterns  421 ,  422 ,  423  and  424  of the quadruple augmented antenna  410  can be confirmed. 
     Referring to  FIGS. 14 and 15 , transfer coefficients S 21 , S 31  and S 41  at she power feeders  471  and  474 , the power feeders  471  and  472 , power feeders  472  and  473  and the power feeders  473  and  474  with respect to the first, second, third and fourth radiation slot patterns  421 ,  422 ,  423  and  424  of the quadruple augmented antenna  410  can be confirmed. 
     Referring to  FIG. 16 , the form of a radio wave radiated from the quadruple augmented antenna  410  can be confirmed. The quadruple augmented antenna radiates radio waves in a spherical form in which radio waves are uniformly radiated in every direction. Radio wave radiation characteristics of the quadruple augmented antenna are improved compared to those of the double augmented antenna, shown in  FIG. 9 . 
     As described above, since the quadruple augmented antenna  410  according to an embodiment of the present invention forms multiple coupling regions using a plurality of radiation slots, the quadruple augmented antenna  410  can transmit and receive radio signals in a wider bandwidth than an antenna pattern  400  shown in the upper part of  FIG. 10 , thereby improving propagation environments. 
     The aforementioned augmented antennas according to embodiments of the present invention can extend the coverage of a wireless communication system by simultaneously transmitting and receiving radio signals in a free space having a poor propagation environment. 
     Furthermore, the augmented antennas according to embodiments of the present invention can improve propagation environments without exposing terminals to multi-path fading. 
     Moreover, the augmented antennas according to embodiments of the present invention can improve the propagation environments at a low cost without increasing the number of relays or micro base stations. 
     In addition, the augmented antennas according to embodiments of the present invention can reradiate radio waves in a wide frequency bandwidth through multi-coupling induction, thereby improving propagation environments in a wide frequency band. 
     Furthermore, an antenna pattern for propagation environment improvement in the augmented antennas according to embodiments of the present invention, can be formed flat on a dielectric layer. Accordingly, the augmented antennas can be manufactured in the form of a sheet or sticker and applied to the surface of various products to improve propagation environments. 
     The present invention may, however, be embodied in many alternate forma and should not be construed as limited to the embodiments set forth herein. Accordingly, while the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intent to limit the invention to the particular forms disclosed, but on the contrary, the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the claims.