WO2005027366A1

WO2005027366A1 - A personal repeater using rf coupling

Info

Publication number: WO2005027366A1
Application number: PCT/KR2004/002343
Authority: WO
Inventors: Sung-Joon Song
Original assignee: Bluemax Comunication Co. Ltd
Priority date: 2003-09-16
Filing date: 2004-09-15
Publication date: 2005-03-24
Also published as: KR20050027961A

Abstract

Disclosed is a personal repeater using RF coupling. According to the personal repeater, a donor antenna which is a antenna facing to a base station is transmitting signal to the base station and receiving signal from the base station, and a loop antenna which is a service antenna facing to a terminal of a member is connected and fixed with an antenna of the terminal by wire in view of mechanism and is connected with it through RF coupling in view of signal, thereby repeating wireless communication service signal between the terminals of a number of mobile communication members. The loop antenna used for the repeater of the invention may have various loop antenna types such as a ring type or a patch type of PCB pattern. From the foregoing, it is convenient to install and use the repeater and a personal shadow area can be cleared with very low cost.

Description

A PERSONAL REPEATER USING RF COUPLING

TECHNICAL FIELD ^• The present invention relates to a repeater for clearing a shadow area by connecting a base station and a terminal in mobile radio communication network, and more particularly to a personal repeater using RF coupling, which everyone can easily install and use irrespective of a place by ensuring an isolation level between antennas using a service antenna of the repeater as a loop antenna.

BACKGROUND ART Recently, the number of users using a mobile radio communication network has been rapidly increased recently. The mobile radio communication network defines a service area as a cell unit which is formed around a base station. Due to a characteristic of frequency used in mobile communication, the inside of a building in the city or a tunnel, an underground space, an area among the mountains, or islands area makes it difficult for an electric wave to reach. There is a very high possibility of a shadow area existing in the above areas. In order to clear such a shadow area, it is necessary for the base station to be installed to the utmost limit. However, there are problems in that it requires a very high cost to install the base station, and interference between the base stations is severe. Thus, the shadow area is cleared by installing a repeater instead of the base station. Notwithstanding, in case of the personal shadow area where service coverage is narrow and the number of users is few, such as home and so on, since the price of the repeater and the cost for installing it happen excessively in a position of a service businessman, there has been a problem in that every shadow area can not be provided with a repeater. Further, a conventional repeater requires from the minimum gain of 50 dB to the gain of 55 dB or more even in case of a repeater with a small power, the isolation problem happens between a service antenna and a donor antenna when installing the repeater. If the isolation is not ensured, an oscillation is generated. Thus, because of the oscillation problem, a restriction according to the installing condition of the repeater happens. Fig. 1 is a diagrammatic view for explaining a conventional repeater. A conventional repeater 20, as shown in Fig. 1, comprises a processing amplifier 21, a donor antenna 30, and a service antenna 32. Referring to Fig. 1, the donor antenna 30 serves as a transmitting/receiving antenna facing to a base station 10. It receives signal emitted from the base station 10 and then transfers it the processing amplifier 21. Then, it receives signal outputted from the processing amplifier 21 and then transmits it to the base station 10. The service antenna 32 serves as a transmitting/receiving antenna facing to a member. It receives signal emitted from a mobile communication terminal 1 and then transfers it the processing amplifier 21. Then, it receives signal outputted from the processing amplifier 21 and then transmits it to the mobile communication terminal 1. The processing amplifier 21 comprises a first duplexer 22, a forwarding amplifier 24, a backward amplifier 26, and a second duplexer 28. The repeater 20 transmits the signal applied from the base station 10 to the mobile communication terminal 1, and, simultaneously, transmits the signal received from the mobile communication tenrtinal 1 to the base station 10. The signal that is transmitted to the mobile telecommunication terminal 1 through the service antenna 32 of the repeater 20 is reflected again. As a result, while the reflecting signal that is received to the donor antenna 30 exists, a reverse signal thereof also exists. The first duplexer 22 receives the signal received through the donor antenna 30 and then outputs to the forwarding amplifier 24. Further, it receives the signal outputted from the backward amplifier 26 and then transmits to the base station 10 through the donor antenna 30. At this time, the signal received through the donor antenna 30 comprises a reflecting signal applied from the service antenna 32 along with a signal outputted from the base station 10. The forwarding amplifier 24 amplifies a signal outputted from the first duplexer 22 and then outputs to the service antenna 32. The second duplexer 28 receives the signal amplified from the forwarding amplifier 24 and then transmits it to the member through the service antenna 32. Further, it receives the signal received through the service antenna 32 and then outputs it to the backward amplifier 26. The backward amplifier 26 amplifies a signal outputted from the second duplexer 28 and then outputs it to the donor antenna

30. Here, the repeater 20 generally adopts a isotropic or omni directional antenna having a wide emission pattern for widely supporting the terminal 1 within a cell area. Fig. 2 is a view for illustrating a dipole antenna that is widely used as a service antenna in a conventional repeater. The dipole antenna 40, as shown in Fig.2, resonates according to a frequency with a wavelength that is twice as long as the length of a pole. That is, if transmitting and receiving a signal having a desired frequency wavelength of λ , the pole length of the dipole antenna 40 should have λ 12. For example, on the assumption that the wavelength in air of 1GHz has 30cm, if the length of the dipole antemia 40 has 15 cm, an antenna for 1GHz is formed. Fig. 3 is a view for illustrating a monopole antenna that is widely used as a service antenna in a conventional repeater. According to the monopole antenna 50, as shown in Fig. 3, since a ground thereof has an image effect, the monopole antenna 50 has a wavelength of λ I , which is reduced to half of that of the dipole antenna 40. For example, on the assumption that the wavelength in air of 1GHz has 30cm, if the length of the monopole antemia 50 has 7.5cm, an antenna for 1GHz is formed. Fig. 4 is a view for explaining signal transmission between a repeater and a mobile communication terminal in case of using a monopole antenna in a conventional repeater. Hereinafter, the same reference numerals are applied to corresponding members as shown in Fig. 1 so as to omit the repeated explanation thereof If the repeater 20 uses a monopole antemia 50 as a service antenna, it has an emission pattern as shown in Fig. 4, and a space loss between the repeater 20 and the terminal 1 has 40dB at the minimum. The signal intensity of the terminal 1 is determined according to the space loss between an antenna of the terminal 1 and the service antenna 32. Thus, a gain of the repeater 20 is changed according to output value and intensity of input signal. For example, the weaker the intensity of the input signal is or the higher the output setting value is, the higher the gain should be ampli ied. However, in case that the gain is highly amplified in the repeater 20, if the isolation level between the donor antemia 30 and the service antenna 32 is not ensured, the problem that the oscillation phenomenon is generated happens. Meanwhile, an antenna does not emit a signal only frontward due to the property of the emission thereof. Thus, a part of the signal emitted from an output antenna flows in an input antenna again. As s result, in a signal amplifying system, the signal of an output end flows in an input end. At this time, the system is in an endless circulating status by repeatedly amplifying and outputting its own signal until output of the system reaches the uppermost limit. Here, such a status is called the "o scillation phenomenon' ' . In order to prevent the above oscillation phenomenon, the intensity of the signal that flows from the output end to the input end should be 15dB or more lower than that of the original input signal. Specially, in case of a high gain system, since the output signal rises in proportion to a rise in the gain, the signal intensity that flows in the input side becomes higher. Thus, in order to reduce it, it is required that the distance between the antennas should be increased or the antenna should be installed so that the isolation level between the antennas may be 15dB or more higher that the system gain using a building which is able to decrease the signal intensity In the worst case, however, if the isolation level is not fully ensured by the adjustment of the installing condition, the system should be installed after decreasing the gain of the repeater not to generate the oscillation. Thus, since the installation of the conventional repeater is accompanied with a complicated process such as the isolation level security, an expert must install it using a measuring device. Therefore, there have been problems in that a conventional repeater requires professional manpower for installing the repeater, and the place for installing it should be selected well. Further, the installing procedure thereof is difficult, it takes many times to install it, and it costs a great deal.

DISCLOSURE OF THE INVENTION To solve the problems as mentioned above, therefore, it is an object of the invention to provide a personal repeater using RF coupling for decreasing gain of the repeater by minimizing space loss between a service antenna of the repeater and a mobile communication terminal, and for easily installing by minimizing electric field reaching range and restraining an oscillation phenomenon. It is another object of the invention to provide a personal repeater using RF coupling for having mechanically various shapes and connecting methods upon realizing the above personal repeater. In an embodiment, the above objects are accomplished by a repeater for repeating a wireless communication service signal between teiirrinals of a number of mobile communication members located in a base station and a shadow area, the repeater comprising: a first transmitting/receiving antenna for transmitting signal to the base station and receiving signal from the base station by wireless; a second transmitting/receiving antemia for transmitting signal to the mobile communication terminal and receiving signal from the mobile communication terminal by wireless through RF coupling; and a signal processing/amplifying section for receiving and amplifying the signal received through the first transmitting/receiving antenna from the base station and then transfemng it through the second transmitting/receiving antenna to the mobile communication terminal, and for receiving and amplifying the signal received through the second transmitting/receiving antenna from the mobile communication terminal and then transferring it through the first transmitting/receiving antenna to the base station. Here, the second transmitting/receiving antenna may be a loop antenna.

The signal processing/amplifying section comprises a first duplexer for receiving input signal received through the first transmitting/receiving antenna and then transmitting output signal through the second transmitting/receiving antenna to the mobile communication terminal, and for receiving input signal received through the second transmitting/receiving antemia from the mobile communication teπninal and then transmitting output signal through the first transmitting/receiving antenna to the base station; a forwarding amplifier for amplifying input signal received from the first duplexer; a second duplexer for receiving input signal received through the forwarding amplifier and then transmitting output signal through the second transmitting/receiving antenna to the mobile communication terminal, and for receiving input signal received from the mobile communication terminal and then transmitting output signal through the first transmitting/receiving antenna to the base station; and a backward amplifier for amplifying input signal received from the second duplexer.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects and features of the invention will become apparent from the following description of preferred embodiments taken in conj nction with the accompanying drawings, in which: Fig. 1 is a diagrammatic view for explaining a conventional repeater; Fig. 2 is a view for showing a dipole antenna as an embodiment of a service antenna according to a conventional repeater; Fig. 3 is a view for showing a monopole antenna as another embodiment of a service antemia according to a conventional repeater; Fig. 4 is a view for explaining signal transmission between a repeater and a mobile communication terminal in case of using a monopole antenna in a conventional repeater; Fig. 5 is a view for explaining signal transmission of a personal repeater using a RF coupling according the invention. Fig. 6 is a diagrammatic view for showing a loop antenna used to a personal repeater using RF coupling according to the invention; Fig. 7 is a view for showing a first embodiment of a loop antenna used to a repeater using RF coupling according to the invention; Fig. 8 is a view for showing a second embodiment of a loop antenna used to a repeater using RF coupling according to the invention; Figs. 9 and 10 are views for showing examples that joins a second embodiment of a loop antenna of the invention and a terminal, respectively; Fig. 11 is a view for showing another example that joins a second embodiment of a loop antenna of the invention and a terminal; Fig. 12 is a view for showing another application status of a personal repeater according to the invention; Fig. 13 is a view for showing a first embodiment of a mechanical constitution of a repeater according to the invention; Fig. 14 is a view for showing an example that adds a pad to a loop antenna shown in Fig. 13; Fig. 15 is a view for showing an example that adds a cap to a donor antenna shown in Fig. 13; Fig. 16 is a view for showing a second embodiment of a mechanical constitution of a repeater according to the invention; Figs. 17 and 18 are views for showing a third embodiment of a mechanical constitution of a repeater according to the invention; Figs. 19 and 20 are views for showing a fourth embodiment of a mechanical constitution of a repeater according to the invention; Figs. 21 to 23 are views for showing a fifth embodiment of a mechanical constitution of a repeater according to the invention; Fig. 24 is a view for showing a sixth embodiment of a mechanical constitution of a repeater according to the invention; Figs. 25 to 30 are views for showing a seventh embodiment of a mechanical constitution of a repeater according to the invention; Fig. 31 is a view for showing an example of a repeater which Bluetooth is built in according to the invention; and Fig. 32 is a view for showing an example of a repeater which a plurality of loop antennas are built in according to the invention.

BEST MODES FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 5 is a view for explaining signal transmission of a personal repeater using a RF coupling according the invention, and Fig. 6 is a diagrammatic view for showing a loop antenna used to a personal repeater using RF coupling according to the invention. Referring to Fig. 5, a personal repeater 200 using RF coupling according to the invention comprises a signal processing/amplifying section 21, a donor antenna 30, and a loop antenna 100 which serves as a service antenna. The personal repeater 200 receives a wireless signal of low output sent from the wireless base station 10 shown in Fig.1 and a mobile communication terminal 1 and then selects and amplifies a frequency of a desired band, thereby resending the RF signal to the mobile communication terminal 1 and the base station 10, in order to accomplish smooth communication between the base station 10 and the mobile communication terminal 1. The signal processing/amplifying section 21 comprises a first duplexer 22, a forwarding amplifier 24, a backward amplifier 26, and a second duplexer 28. The first duplexer 22 receives the signal received through the donor antenna 30 and then outputs to the forwarding amplifier 24. Further, it receives the signal outputted from the backward amplifier 26 and then transmits to the base station 10 through the donor antenna 30. The forwarding amplifier 24 amplifies input signal outputted from the first duplexer 22 and then transmits output signal to the loop antenna 100. The second duplexer 28 receives the signal amplified from the forwarding amplifier 24 and then transmits it to a member through the loop antenna 100. Further, it receives the signal received through the loop antenna 100 and then outputs it to the backward amplifier 26. The backward amplifier 26 amplifies input signal outputted from the second duplexer 28 and then transmits output signal to the donor antenna 30. The donor antenna 30 serves as a transmitting/receiving antenna facing to the base station 10. It receives signal emitted from the base station 10 and then transfers it the signal processing/ amplifying section 21. Then, it receives input signal outputted from the signal processing/amplifying section 21 and then transmits it to the base station 10. The loop antenna 100 serves as a transmitting/receiving antenna facing to the member terminal 1, and is connected to the signal processing/amplifying section 21 with a feeder line. Further, the loop antenna 100 is connected to an antenna of the mobile communication terminal 1 by RF coupling method. That is, since the loop antenna 100 has a shape of a ring, the antenna of the mobile communication terminal 1 is inserted in the ring to be coimected each other. As a result, the loop antenna 100 and the antenna of the mobile communication terminal 1 are coupled by wireless through RF coupling. Here, although the method for connecting the loop antenna 100 and the antenna of the mobile communication teπninal 1 may have various types as described hereinafter, it uses a general method, and it is not limited to a specified method. As such, the loop antenna 100 connected with the antenna of the mobile communication terminal 1 by RF coupling method receives the signal emitted foπn the mobile communication teπninal 1 and then transfers it to the signal processing/amplifying section 21, thereby receiving the signal outputted from the signal processing/amplifying section 21 and then transmitting it the mobile communication terminal 1. The loop antenna 100, as shown in Fig. 6, is made of wire that is wound into a series of loops. It has a characteristic that electric power is closed up to the inside of the loop. Further, it has a very great secure direction property. Coils of the wire are inserted within a cover that is molded with aluminum alloy and has a streamlined shape, and, simultaneous, it clears a generating mutual interference. Fig. 7 is a view for showing a first embodiment of a loop antenna used to a repeater using RF coupling according to the invention. The loop antenna 100 according to the invention, as shown in Fig. 7, may be realized by joining a PCB 104 which is foraied with a hole 104a for inserting the antennal of the terminal in the center thereof and a pair of rubber molding members 102 and 106 which have the same shape for attaching to upper and lower sides of the PCB 104, respectively. Fig. 8 is a view for showing a second embodiment of a loop antenna used to a repeater using RF coupling according to the invention, Figs. 9 and 10 are views for showing examples that joins a second embodiment of a loop antenna of the invention and a terminal, respectively, and Fig. 11 is a view for showing another example that couples a second embodiment of a loop antenna of the invention and a terminal. Since the first embodiment of the loop antenna 100 adopts the method for inserting the antenna of the terminal 1 into the loop antenna, an inner diameter of the loop antenna has a proper size according to the size of the antemia of the terminal. For example, in case that the loop antenna 100 is manufactured so that the inner diameter thereof is much more large than the inner antenna of the antenna of the terminal, the distance between the center of the antenna of the terminal and the loop antenna 100 is remote, and, thus, a coupling loss between the antennas is increased. As a result, a pad such as a rubber and the like should be added to the inside of the loop antenna to maintain a physical join. However, a small sized folder type terminal has a problem in that the folder thereof cannot be fully opened due to the loop antenna with the addition. To resolve this problem, there is provided another loop antenna 100^' which is made by forming a loop pattern on a PCB plate which is not formed with a hole as shown in Fig. 8. The loop antenna 100' , as shown in Figs. 9 and 10, is adjacent to the antenna of the terminal 1 and then is joined to it. At this time, to physically join the second embodiment of the loop antenna 100' to the antenna la of the terminal, the loop antenna 100' , as shown in Fig. 11, may be joined in a manner of pick up the antenna la of the terminal by embodying the loop antemia 100' as a shape of tongs 108. Here, in case that the loop antenna 100' is realized as the shape of tongs, since there is no need for adding the rubber mold or a plastic member, and, thus, the loop antenna 100' can be joined without interference. As such, according to the invention, since the loop antenna 100 of the repeater and the antenna of the mobile communication terminal are adjacent together mechanically, it can be efficiently used in a limited place such as a personal shadow area. Further, since the signal transmission between the loop antenna 100 and the antenna of the mobile communication terminal 1 is performed by wireless through

RF coupling, the space loss between the repeater 200 and the mobile communication terminal 1 is reduced to -lOdB or less. As a result, since the invention can provide the repeater 200 having a low amplifying gain, the repeater can be made compactly. Further, since the gain of the repeater can be reduced, the required isolation level is also reduced. Further, since, in the loop antenna 100, the electric power is concentrated into the inside of the loop thereof, a signal from the donor antenna 30 is not flown in the loop antenna 100 or a signal is not transferred to the donor antenna 30. As a result, it is not affected according to a distance between two antennas 30 and 100 or a joined type. Therefore, the invention allows everybody to easily install the repeater 200, and can enhance communication quality. Fig. 12 is a view for explaining signal transmission between a repeater using a loop antenna of the invention and a mobile communication teπninal. Compared to Fig. 5, a repeater in Fig. 12 further comprises a forwarding path that is provided with an amplifier 24^' and a retarder 25, and a wireless handset 300 connected to the mobile communication terminal 1. As such, in case of dividing one forwarding path into two and passing through the retarding element 25 such as SAW, the variance of the signal of the base station is minimized by maximizing the performance of a rake receiver, thereby enhancing the perfoπnance of the repeater. In case of using the repeater 200 of the invention, since the installation of the repeater is completed by inserting the antenna of the mobile communication terminal 1 into the loop of the loop antenna 100 using the loop antemia 100 as the service antenna of the repeater 200, everybody can easily install it without regard to the isolation level between the service antenna and the donor antemia. At this time, since the loop antenna 100 of the repeater 200 and the antenna of the mobile communication teπninal 1 are adjacent together physically, a user should use the terminal 1 in the limited place, that is, in the vicinity of the repeater 200, like a wire telephone. However, as shown in Fig. 12, in case of using the mobile communication terminal 1 having a wireless hands free function, since a wireless hands free 300 and the mobile communication teπninal 1 are connected in a manner of Bluetooth, ZigBee or IrDA, a user may speak by telephone while freely moving at home or in the office. That is, the mobile communication teπninal 1 transmits the signal received from the base station 10 to the hands free 300 by wireless through the repeater 200 in a manner of Bluetooth, ZigBee or IrDA. Further, it receives the signal outputted from the hands free 300 in a manner of Bluetooth, ZigBee or IrDA by wireless and then transmits it through the repeater 200 to the base station. The wireless hands free 300 receives the signal outputted from the mobile communication terminal 1 in a manner of Bluetooth, ZigBee or IrDA by wireless and then outputs it through a speaker to the user. Further, it transmits the voice signal transferred from the user by wireless in a manner of Bluetooth, ZigBee or IrDA by wireless through a microphone and then outputs it to the mobile communication terminal 1. As such, according to the invention, since the hands free 300 and the mobile communication terminal 1 are connected by wireless in a manner of Bluetooth, ZigBee or IrDA without using a wire, the user can speak by telephone while freely moving. Fig. 13 is a view for showing a first embodiment of a mechanical constitution of a personal repeater according to the invention, wherein a donor antenna and a service antenna are connected to a signal processing/amplifying section using a feeder line. Referring to Fig. 13, the signal processing/amplifying section is realized in a body 72, a donor antenna is realized as a monopole antemia 71 which stands vertically on a supporting plate, and a service antemia is realized as a loop antenna

73 which is provided with a hole 73a in the center thereof and has a shape of a hexahedron. Further, the service antenna, as shown in Fig. 14, is provided with a member

74 in the hole of the loop antemia having a shape of the hexahedron. It causes the antenna of the terminal to be tightly joined to the loop antenna and causes the antenna of the teπninal to be easily detachably mounted to the loop antenna. At this time, preferably, the member 74 may be made of soft material such as rubber or plastic. Further, the donor antenna, as shown in Fig. 15, is provides with a cap 75 which is larger than the hole 73a of the service antenna at an upper end thereof to prevent the service antenna from inserting into the donor antemia. That is, if the service antenna is fixed to the donor antenna, it is feared that the parts are damaged by the oscillation. Thus, the safety cap 75 which is made of plastic or πibber is installed on the upper end of the donor antenna to prevent the service antenna from fixing to the donor antenna. Further, although it is not shown in the drawings, RF switch may be added to the connection portion of the donor antenna to connect to another alien antenna. Further, the comiection portion of the donor antenna is realized as a connector that is joined by a screw to replace with another high gain antemia. Fig. 16 is a view for showing a second embodiment of a mechanical constitution of a personal repeater according to the invention, wherein a service antenna is integral to a body of a signal processing/amplifying section, and a donor antenna is connected to the body by a feeder line. Referring to Fig. 16, in the second embodiment of the invention, the signal processing/amplifying section is realized within a box 82. The service antenna is consisted of a projection 84 having a hole 84a for inserting the antemia of the mobile communication teπninal, which is integrally installed on a portion of the body 82. Further, the donor antenna is realized as a monopole antenna 71 which stands vertically on a supporting plate, and then is connected to the body 82 by the feeder line. According to the constitution of the second embodiment, since the service antenna is integral to the body 82, it is convenient to place the mobile communication terminal 1 on the body 82. At this time, the body 82 is provided with a magnet and the terminal 1 has an iron plate, thereby fixing the teπninal 1 to the body by magnetic force. Figs. 17 and 18 are views for showing a third embodiment of a mechanical constitution of a personal repeater according to the invention, wherein a donor antenna and a service antemia is integral to a body of a signal processing/amplifying section. Refeπing to Fig. 17, the personal repeater of the invention is provided with the service antenna which is formed with a hole 94a for inserting an antenna of a mobile communication teπninal on an upper side of a body 93 having a signal processing/amplifying section. Further, the donor antenna having a shape of a pole

91 that has a universal joint axis 92 at an end thereof to rotate up and down or right and left is integrally installed on the side of the body 93. Refeπing to Fig. 18, the service antenna has a loop pattern fonned on a PCB, which is projected at the position corresponding to an antemia of a teπninal. This projected loop antemia 96, when placing the terminal 1 on the body 93, can compensate for the difference of coupling loss generated when the height of a battery of the terminal is different. That is, the loop antenna 96 is constituted so that the height thereof which is projected may be automatically adjusted according to the height of the antemia of the terminal. Specifically, since the height of the loop antenna 96 is varied up and down, when the terminal is fixed to the body using a magnet and a steel plate, the height of the loop antenna 96 may be automatically adjusted. As such, according to the third embodiment, the installation and the placement is more convenient since the service antenna and the donor antemia is integral to the body 93. Specially, the connection portion of the donor antenna is constituted in a manner of the universal joint to adjust the rotation angle thereof up and down or right and left, and, thus, the donor antenna can be adjusted to face to a base station. At this time, in case of requiring a direction adjustment in a vertical direction of the antenna, the adjustment for facing to the base station can be easily made using a helical typed antenna which is not shown here as the donor antenna. Fig. 19 is a view for showing a fourth embodiment of a mechanical constitution of a personal repeater according to the invention, wherein a donor antemia and a service antemia are integral to a body having a signal processing/amplifying section, and the donor antenna is realized as a PCB typed patch antenna on the side surface or the rear side of the body. Referring to Fig. 19, the personal repeater of the invention is provided with the service antenna which is formed with a hole 94a for inserting an antemia of a mobile communication terminal on an upper side of a body 93 having the signal processing/amplifying section. Further, the donor antenna that is formed as the PCB typed patch antenna 95 is installed on the side or the rear side of the body 93. Referring to Fig. 20, the service antenna has a loop pattern foπned on a PCB, which is projected at the position corresponding to an antenna of a terminal. The loop antenna 96, as shown in Fig. 18, is constituted so that the height thereof may be automatically adjusted according to the height of the antenna of the teπninal. That is, since the height of the loop antenna 96 is varied up and down, when the teπninal is fixed to the body using a magnet and a steel plate, the height of the loop antenna 96 may be automatically adjusted. As such, according to the fourth embodiment, the installation and the placement are more convenient since the service antenna and the donor antenna is integral to the body 93. Specially, since the donor antennal is constituted as the PCB typed patch antenna, there are advantages in that the manufacturing cost of the repeater can be saved, it is more convenient to handle, and its outer appearance is beautiful. Fig. 21 is a view for showing a fifth embodiment of a mechanical constitution of a personal repeater according to the invention, wherein a donor antenna and a service antemia are integral to a body 110 of a signal processing/amplifying section, and the donor antenna is realized as a PCB typed patch antenna 12 on the side or the rear side of the body 110. Further, the service antenna is realized by various typed PCB patterns 114 on an upper side of the body 5 1 10 without projecting on the body 110. The fifth embodiment is proper for a PCB pattern (micro strip) type that a antenna of a mobile communication terminal is not projected. Re fening to Fig. 21, the repeater of the invention is provided with a donor antenna that is made as a PCB typed patch antenna 112 within a body 1 10 having a O signal processing/amplifying section and a service antenna that is foraied as a loop pattern 114 on a PCB on an upper surface of the body 110. At this time, the pattern of the service antemia may have various shapes such as a circle shown in Fig. 22 or a square shown in Fig. 23. As such, according to the fifth embodiment, while the service antenna and5 the donor antemia are integral to the body, they are not projected from the body. Thus, the outer appearance of the body is beautiful, and, also, the body may have various designs. Further, the installation and the placement are more convenient. Specially, according to the fifth embodiment, the PCB pattern type that the antenna of the mobile communication terminal is not projected is proper. If placing the 0 mobile communication teπninal on the upper surface of the body 110, the service antenna of PCB pattern type and the antenna of the mobile communication terminal are coupled by wireless. Although it is not shown in the drawings, if the first embodiment to the fifth embodiments adopt a type that the mobile communication terminal can be connected 5 to a hands free by wireless through Bluetooth, ZigBee or IrDA, after installing the repeater and the mobile communication terminal at the fixed places, respectively, a user may speak by telephone using the hands free while freely moving. Further, since the personal repeater of the invention has a small size, it is portable joined with the mobile communication terminal, and, thus, the user may O speak by telephone while freely moving without the hands free. To do this, in case of an integral type, it is preferable that a magnet for attaching the terminal to the body may be added. That is, the terminal and the antenna may be fixed together using the magnet and a steel plate attached to the rear side of the terminal. Fig. 24 is a view for showing a sixth embodiment of a mechanical 5 constitution of a personal repeater according to the invention, wherein the repeater is realized as a subsidiary pack or a case 120 for receiving a mobile communication terminal 1. That is, the repeater of the sixth embodiment adopts the subsidiary pack or a holder 120 for receiving the terminal as well as for integrally constituting a signal processing/amplifying section, a donor antemia and a service antenna. At this time, the donor antenna and the service antenna are realized in a shape of micro strip formed on a PCB. Further, for a power supply of the repeater, the power of the mobile communication teπninal 1 may be used or a separate battery may be used built in the repeater itself. As such, according to the constitution of the sixth embodiment, since the repeater is portable because of a compact size thereof, the user may use it while moving. Figs. 25 to 30 are views for showing a seventh embodiment of a mechanical constitution of a personal repeater according to the invention, wherein the repeater is realized in a shape of a cap 130 that receives a mobile communication terminal. At this time, there are various types such as a band type, a rubber cap type, a locking type having a shape of a hinge, a sliding cap type, and a tongs type according to a method for joining the repeater with the teπninal. That is, it is provided the method for fixing the repeater with the terminal using a fixture having a shape of the cap formed on an upper side of a loop antenna to increase an attaching force of a magnet. Fig. 25 shows a method for fixing a terminal 1 using a repeater 130 having a shape of a cap that is made of a material having contractibility, such as a rubber or a rubber band according to the invention. Although mounting and detaching of the teπninal is convenient, fixing force between the teπninal 1 and the repeater 130 is weak. Fig. 26 shows a repeater for complimenting a fixing status of the repeater using a rubber cap according to the invention. That is, Fig. 26 shows a method for fixing a repeater to a terminal 1 by using a rubber cap 140 made by injection molding and then pressing it on an antenna part of the terminal 1. Fig. 27 shows a method for pressing and fixing a repeater 150 to a teπninal using the repeater 150 having a hinge typed lock according to the invention. Although manufacturing of the repeater 150 is convenient, in case that the lock is made of a hard plastic, it may be broken by a shock generated when the repeater 150 is drop. Fig. 28 shows a method for intensifying a pressing strength according to the invention. That is, Fig. 28 shows a repeater 160, in which a part for fixing the antenna of the terminal is manufactured in a shape of a sliding cap which is made of rubber, silicon or plastic, and the cap has an inlet and an end having a different size compared to the inlet so that a pressing force becomes stronger with the antenna moving. Referring to Fig. 29, a repeater 170 and the teπninal are fixed together by installing a fixing tongs 172 on a portion of the repeater 170. The tongs and the loop antenna are provided with an attachment made of silicon or rubber at pressing surfaces of the tongs and on an upper surface of the loop antenna, respectively, thereby preventing slip and intensifying fixing strength. Fig. 30 shows a method for decreasing a size of a cap typed repeater 180 according to the invention, wherein the repeater 180 has a battery of the terminal 1 in common with the tenninal 1. That is, electric power is supplied to the repeater 180 using a cable 182 which is connected with a charging port of the teπninal 1. Fig. 31 is a view for showing an example of a repeater which Bluetooth is built in according to the invention, wherein a Bluetooth module 192 is added within a repeater 190, and, thus, even though a mobile phone 1 does not have the Bluetooth module, a wireless hands free 100 which adopts a method of Bluetooth may be used. The repeater 190 of the invention has the Bluetooth module 192 as well as the repeater circuit 21 as mentioned above, wherein the Bluetooth module 192 is connected to a LED 193 for displaying an operational status, an antenna 194 which is built in the repeater 190 to communicate with another Bluetooth module, and a jack of EAR/MIC 195 for inputting and outputting a voice signal. Further, in order to use the repeater 190 of the invention, the antenna of the mobile communication terminal 1 is connected to a loop antenna of the repeater, and the jack of EAR/MIC of the terminal is connected through a connection cable 196 to a the jack of EAR/MIC 195 of the Bluetooth module. Therefore, the wireless hands free 300 having the Bluetooth module is connected by wireless to the Bluetooth module 192, the mobile communication terminal 1 is connected by wire to the jack of EAR/MIC 195, and the mobile communication terminal 1 and the repeater 190 are connected each other through the loop antenna 100. As a result, even in case of the mobile communication tenninal 1 having a function of Bluetooth, the hands free 300 can be used through the Bluetooth module 192 of the repeater. Fig. 32 is a view for showing an example of a repeater which a plurality of loop antennas are built in according to the invention, wherein a projecting typed loop antenna 94 and a PCB pattern typed loop antenna 114 is realized in the repeater, respectively, and one of them can be selected by an RF switch 198. That is, as the mobile phone has recently had various kinds, an antenna of a mobile phone also has had various types such as a projecting type or a built-in type. Thus, one of the loop antenna 94 which is projected to be suited for the antenna of the mobile phone and 5 the pattern typed antenna 114 can be selected and then be used. A user can select one of the antennas by manipulating the RF switch 108 by hand. Further, such a selection of the antenna can be mechanically constituted so that, if the user pushes backward the projecting typed antenna 94 and then folding it, the pattern typed antenna 114 may be automatically selected. 0 The personal repeater using RF coupling according to the invention may be changed and applied to various shapes within the scope of technical spirit of the invention, and is not limited the above prefeπed embodiments. Further, the above embodiments and drawings are for the puipose of explaining in detail the concepts of the invention, and are not for the puipose of limiting the scope of teclinical spirit of 5 the invention. Accordingly, since any and all substitutions, variations or changes may accrue to those skilled in the art without departing from the teclinical spirit of the invention, it will be appreciated that they are not limited to the above embodiments and appended drawings. That is, although, in the above prefeπed embodiment, the loop antenna 100 O and the mobile communication teπninal 1 are connected each other by wire in view of mechanism and they are connected by RF coupling in view of signal, the invention is not limited thereto. For example, the output of the second duplexer 28 of the repeater 20 may be directly connected to the antenna of the mobile communication 1 in view of mechanism and signal. Further, the repeater according to the invention 5 may be built in the mobile communication terminal 1. Since such a constitution may be easily worked or used by those skilled in the art, the detailed description is omitted hereinafter.

FNDUSTRIAL APPLICABILITY O From the foregoing, the invention provides a personal repeater that an individual can simply install and carry in order to clear a limited shadow area (for example, personal shadow area) contrary to a conventional repeater that a number of people use in common by realizing a service antemia of the repeater as a loop antenna. 5 According to the invention, since the output of the repeater and the output of the mobile communication tenninal are made simultaneously, the invention has a function of a diversity of transmission of the mobile communication terminal. Further, since the repeater receives a backward signal using the loop antenna, any signal other than the signal of the mobile communication terminal in the loop antemia is not amplified without using a filter such as SAW (Surface Acoustic Wave), witch has a superior detection property. Therefore, there are effects in that a cost of the repeater can be cut down and the communication quality can be enhanced due to the reduction in space loss between the repeater and the mobile communication teπninal and the reduction in gain o f the rep eater.

Claims

1. A repeater for repeating a wireless communication service signal between terminals of a number of mobile communication members located in a base station and a shadow area, the repeater comprising: a first transmitting/receiving antenna for transmitting signal to the base station and receiving signal from the base station by wireless; a second transmitting/receiving antenna for transmitting signal to the mobile communication terminal and receiving signal from the mobile communication terminal by wireless through RF coupling; and a signal processing/amplifying section for receiving and amplifying the signal received through the first transmitting/receiving antemia from the base station and then transfemng it through the second transmitting/receiving antemia to the mobile communication tenninal, and for receiving and amplifying the signal received through the second transmitting/receiving antemia from the mobile communication terminal and then transferring it through the first transmitting/receiving antemia to the base station.

2. A repeater according to claim 1, wherein the second transmitting/receiving antenna is a loop antemia.

3. A repeater according to claim 2, the loop antemia has a shape of a hexahedron which is fonned with a hole for inserting the antenna of the mobile communication teπninal in the inside thereof.

4. A repeater according to claim 3, the hole is provided with a member made of rubber or plastic in the inner side thereof.

5. A repeater according to claim 2, the loop antenna is a patch typed loop antenna having a loop pattern formed on a PCB.

6. A repeater according to claim 5, the patch typed loop antenna has a shape of tongs, thereby joining with the mobile communication tenninal in a manner of picking up the antenna of the tenninal.

7. A repeater according to claim 2, wherein the signal processing/amplifying section is built in a body, the loop antenna being constituted as a projection fonned on a part of the body, which is fonned with a hole for inserting the antenna of the mobile communication tenninal, to thereby be integral to the body.

8. A repeater according to claim 2, wherein the signal processing/amplifying section is built in a body, the loop antenna being fonned as a PCB pattern on a part of the body.

9. A repeater according to claim 8, wherein the loop antenna is projected that the height thereof may be varied according to a position corresponding to the antemia of the mobile communication terminal, the loop antenna being actuated upward by an elastic force, whereby the loop antemia is moved up and down according to a force pressed by the antenna of the mobile communication tenninal.

10. A repeater according to claim 1, wherein the first transmitting/receiving antenna has a shape of a monopole which stands vertically on a supporting plate.

11. A repeater according to claim 10, wherein the monopole is provided with a cap made of a rubber or a plastic at an upper end thereof.

12. A repeater according to claim 1, wherein the signal processing/amplifying section is built in a body, the first transmitting/receiving antenna is a pole typed antenna which is connected to a part of the body in a manner of universal joint.

13. A repeater according to claim 1 , wherein the signal processing/amplifying section is built in a body, the first transmitting/receiving antenna is constituted as a PCB typed patch antemia on a part of the body, whereby the first transmitting/receiving antenna is integral to the body.

14. A repeater according to claim 1, wherein the repeater is provided with a cap, a subsidiary pack or a case for receiving the mobile communication tenninal.

15. A repeater according to claim 14, wherein the repeater and the service antenna of the teπnmal are fixed each other by any one type selected from the group consisting of a rubber cap type, a hinge shaped locking type, a sliding cap type, and a tongs type.

16. A repeater according to claim 1, wherein the signal processing/amplifying section comprises: a first duplexer for receiving input signal received through the first transmitting/receiving antemia and then transmitting output signal through the second transmitting/receiving antenna to the mobile communication terminal, and for receiving input signal received through the second transmitting/receiving antemia from the mobile communication tenninal and then transmitting output signal through the first transmitting/receiving antemia to the base station; a forwarding amplifier for amplifying input signal received from the first duplexer; a second duplexer for receiving input signal received through the forwarding amplifier and then transmitting output signal through the second transmitting/receiving antemia to the mobile commimication tenninal, and for receiving input signal received from the mobile communication tenninal and then transmitting output signal through the first transmitting/receiving antemia to the base station; and a backward amplifier for amplifying input signal received from the second duplexer.

17. A repeater according to claim 16, wherein the repeater further comprises: a second forwarding amplifier for amplifying input signal received from the first duplexer; and a retarder for retarding output of the second forwarding amplifier and then outputting to the second duplexer.

18. A repeater according to any one of claims 1 to 16, wherein the mobile communication tenninal is com ected to a hands free be wireless.