KR20060102062A - Antenna composition method for dual band communication and antenna therefor - Google Patents

Abstract

The present invention relates to a method for configuring an antenna for dual band communication and an antenna for the same. In order to simultaneously support several communication services using different frequency bands, separate antennas having individual characteristics are used and high frequency bands are used. In the case of a multi-band antenna, two antennas of small volume can be designed and combined using a short point of λ to have a single feed point, but the antenna for broadcasting reception using a relatively low frequency band Since it is very difficult to implement a mobile communication antenna using a frequency band as a combination of antenna structures of the same type, it is necessary to use antennas of a type suitable for each communication means individually, thereby increasing the size of the terminal and inconvenient design and use. To make it less esthetic There was a problem. In consideration of such a problem, the present invention combines a whip-type antenna for receiving a broadcast service using a low frequency band and a helical antenna for electrically supporting a mobile communication service using a high frequency band in a single structure. After the configuration, each feed point is connected to a dedicated communication module, so that the user feels as a single antenna, but in reality, two different antennas operate as if they were configured separately, so that the aesthetic and the actual mounting space and design can be used in many ways. It has the effect of bringing improvement.

Description

ANTENNA COMPOSITION METHOD FOR DUAL BAND COMMUNICATION AND ANTENNA THEREFOR}

1 to 2 is a perspective view showing a conventional general terminal antenna configuration.

Figure 3 is a perspective view showing the configuration of a conventional dual band terminal antenna.

4 is a perspective view illustrating an antenna structure of a terminal to which a separate broadcast receiving module is applied.

5 is a conceptual diagram showing an antenna configuration of an embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

1, 20: terminal structure 2, 5: helical antenna

3, 6: whip antenna 8, 9: dual-band helical antenna

4, 7, 10: antenna feeding point 21: antenna for mobile communication

25: antenna for receiving broadcast 22, 26: antenna feed point

100: helical antenna 110: whip antenna

f1, f2: antenna feed point

The present invention relates to a method for configuring an antenna for dual band communication and an antenna therefor. In particular, the present invention relates to a dual band antenna having a large band difference, thereby minimizing the antenna occupied space in a limited wireless device. The present invention relates to an antenna configuration method for dual band communication and an antenna therefor.

With the rapid development of analog and digital communication technology in the world, various kinds of mobile communication services such as cellular, PCS, GSM and Iridium services using satellites are being implemented. PCS and the like are in commercial service, and recently Digital Multimedia Broadcasting (DMB), which introduces the concept of personal multimedia, is also being tested.

The personal mobile terminal used for the mobile communication service has been developed with the aim of miniaturization, multifunction, light weight, and low power, and the antennas essential for the base station and the terminal are the core of the signal input / output and determine the call quality. Its importance is increasing day by day.

In particular, since the performance of the small antenna varies depending on the type and material of the terminal to be mounted, unlike other core components, there is a difficulty in that the design varies according to the terminal model in order to obtain optimal performance. Therefore, while researches have recently been made to integrate antennas inside a terminal, very few antennas provide satisfactory performance for all directivity angles.

In addition, unlike the mobile communication service using a single frequency band, a service that can communicate anywhere in the world is required, and a method for receiving a plurality of different services using a single terminal has been developed for this purpose. . Antennas and various components mounted on the multi-service terminal are required to operate normally in two or more frequency bands while satisfying existing size and electrical standards, and thus are difficult to develop and manufacture.

Especially for antennas, cellular (824 ~ 894MHz) and PCS (1750 ~ 1870MHz) have a center frequency of about 1GHz, and the antenna required for a terminal with a newly introduced digital multimedia broadcasting receiver module is 174 ~ 216MHz for terrestrial DMB. Because of the use of the band, the center frequency difference with the mobile communication service in the GHz band is enormous, making it difficult to construct a dual band single antenna.

Then, the antenna structures of the mobile communication terminals among the actual wireless devices will be described.

1 and 2 illustrate an antenna structure of a general mobile communication terminal, which is the most widely adopted form in the world, and the basic structure has a helical antenna having a length of λ / 4, respectively. ) And a monopole whip antenna (3, 6). When the signal standby state and the propagation environment are mainly good, the helical antennas 2 and 5 operate alone, and in the poor propagation environment, the two antennas operate simultaneously while the whip-type antenna units 3 and 6 are drawn out. As shown, there are two types according to the positions of the helical antennas 2 and 5, and there are many variations depending on the signal feeding and the coupling method of the two antennas. In essence, however, they use a single feed point (4, 7), and recently, when only the helical antennas (2, 5) are used alone without the whip type antenna parts (3, 6) due to the improvement of the high efficiency antenna and the communication part. There are many.

In addition, research has been conducted to incorporate a planar antenna such as PIFA (Planar Inverted F Antenna) inside the terminal. Further research is still needed to apply to telecommunication services.

In addition, chip-type antennas that form monopoles and helical antennas on high-k dielectric ceramic substrates by applying advanced multilayer substrates and dielectric manufacturing techniques are also being developed, and products that improve chip antenna performance through improved pattern technology have been developed. Due to the directivity characteristic when mounted on the main body of the terminal, it is difficult to apply it directly to the currently used communication network.

Therefore, until now, the method of protruding the helical antenna to the outside may be referred to as the antenna structure which is most used.

Recently, terminals to support various communication schemes have been developed to expand the usage of the terminals, such as multi-band terminals for overcoming compatibility limitations between services using different frequency bands. Since it can provide the best among different mobile communication services according to the signal condition and region, it is receiving favorable response in the area where various communication methods are mixed (Europe, USA, China, etc.), and rapid demand increase is expected in the future. . Accordingly, researches on small antennas suitable for this purpose are being actively conducted. As one of the methods, a dual band helical antenna having the same size as a conventional small antenna and having a dual structure has emerged.

3 shows two conventional helical antennas 8 and 9, in which two helical antennas 8 and 9 each having a different resonant frequency are wound in the same direction while having the same axis on the top of the terminal 1. Form. The feed point 10 is made by a coaxial line at the same point under the antenna, and the loops of the helical antenna are electrically separated using an insulation coating.

The integrated dual band antenna, which looks like one antenna externally, makes it possible to use a desired service among different mobile communication services. However, this case is limited to the case where the resonant frequency is somewhat high and similar bands such as CDMA, TDMA, PCS, GPS, and the like. That is, it is very difficult to integrate a communication antenna using such a high resonance frequency band and a communication antenna using a relatively very low frequency band into one. That is, since the antenna for obtaining a high band frequency uses a length of λ / 4, the size of the antenna can be reduced by using a helical antenna type because the length of the required antenna is relatively short, but when the frequency band is lower than that, There is no choice but to use a long whip antenna.

4 illustrates an antenna structure of a terminal 20 to which a digital multimedia broadcasting (DMB) receiving module has recently been in the spotlight. As shown in FIG. 4, a mobile communication antenna 21 and a DMB antenna 25 and 26 are separately provided. It is installed and used. Naturally, the feed point of each antenna is also configured separately, sharing user interface resources such as the display unit and the input / output unit of the terminal, but having complete independence in communication.

The DMB is classified into a satellite DMB and a terrestrial DMB, and is a system for receiving multimedia information or data through a terminal while moving. The DMB broadcasts video, audio, and data through a plurality of channels, and through a predetermined local transmitter. The terminal receiving the data selects and receives some of the provided broadcast channels. That is, the receiving terminal may receive broadcast information of a desired channel and provide the content as audiovisual information to the user, and may store some of the digital broadcast information, and thus, has been in the spotlight as a personalized multimedia device.

However, the terrestrial DMB service, which is currently being used in the pilot service, uses 174 to 216 MHz bands, and thus, a difference in use bands occurs between the cellular (824 to 894 MHz) and the PCS (1750 to 1870 MHz). Therefore, as shown in FIG. 3, it is very difficult to form an antenna for DMB reception in the same structure as the antenna for mobile communication, and then combine them to form a single antenna supporting dual bands. Therefore, as shown in Fig. 4, each antenna is mounted and used in the terminal. The same applies to a mobile communication terminal in which a module for watching a general over-the-air TV is integrated. It is very difficult to integrate a broadcasting reception antenna using a relatively low frequency band and a mobile communication antenna using a high frequency band.

As described above, in order to simultaneously support several communication services using different frequency bands, separate antennas for individual characteristics are used, and in the case of a multi-band antenna using high frequency bands, the short length of λ is used. Although two small-volume antennas could be designed and combined to form a single feed point, a combination of antenna structures of the same type may be used for broadcasting reception antennas using a relatively low frequency band and mobile communication antennas using a high frequency band. Since it is very difficult to implement, there is a problem that the size of the terminal, the design and use becomes inconvenient, and the aesthetics are deteriorated because the antennas of the type suitable for each communication means cannot be used individually.

In view of the above problems, the present invention provides a single structure by electrically combining a whip antenna for receiving a broadcast service using a low frequency band and a helical antenna for supporting a mobile communication service using a high frequency band. After the configuration, the user can feel each one as a single antenna by connecting each feed point with a dedicated communication module, but in practice, the antenna configuration method for dual-band communication to operate as if two different antennas are each configured and It is an object to provide an antenna for.

According to the present invention for achieving the above object, a first antenna for corresponding to a predetermined frequency band and a second antenna for corresponding to a lower frequency band than the first antenna are structurally coupled to each other to form a single antenna shape. Configuring the appearance of each antenna to be able to; Coupling the first and second antennas to be electrically isolated; And individually designating the first antenna feed point and the second antenna feed point to connect the antennas to predetermined communication means, respectively.

One of the first antenna and the second antenna may be a helical antenna having an empty interior, and the other may be a whip antenna passing through the helical antenna.

In addition, the present invention includes a first antenna for corresponding to a predetermined frequency band; A second antenna structurally coupled with the first antenna to share a mounting position and corresponding to a lower frequency band than the first antenna; Characterized in that the feed points formed in each of the first antenna and the second antenna.

The first antenna is in the form of a helical antenna having a hollow cylindrical structure, the second antenna is in the form of a whip antenna extending through an empty cylinder of the first antenna, and each feed point is electrically separated. It is characterized by.

When described in detail with reference to the accompanying drawings an embodiment of the present invention as follows.

5 is a conceptual view showing the configuration of an embodiment of the present invention, by combining the two antennas on the left as shown on the right as shown on the right to implement on a terminal as a structure, to mount the antenna with a minimum space only Not only can it be done, but it can also pursue better aesthetics in design.

Looking at the individual antennas on the left side, the left side is a helical antenna 100 having a feed point f1 at the lower end, and the right side is a whip-type antenna 110 having a feed point f2 at the lower end. Likewise, the antennas 100 and 110 having different structures are to be integrated into one structure. In particular, when the antennas 100 and 110 of such an integrated structure are used in a wireless communication device that can use such different types of antennas, it is possible to minimize the number of visible antennas and the antenna mounting space, and thus a high effect can be expected. . An example of a wireless device using a plurality of antennas having a different structure is a mobile communication terminal to which a broadcast receiving module is applied for listening to a broadcast. In this case, a relatively long whip antenna 110 is required as shown on the right side. In order to use a general mobile communication service, a helical antenna 100 as shown on the left side is required.

Hereinafter, an antenna applied when the DMB receiving module is added to the mobile communication terminal will be described as an example. In the case of a mobile communication terminal, a frequency band in GHz (cellular: 824 to 894 MHz and PCS: 1750 to 1870 MHz) is used, so that a short length helical antenna can be realized due to a high resonance frequency, but in the case of the terrestrial DMB, a kind of DMB, Because of the relatively low band of 174 ~ 216MHz, the length of the antenna is inevitably long. Therefore, it is effective to implement the long whip type antenna 110 in two or three stages in a retractable structure.

Each antenna having such structures can be combined in one structure because of the structural characteristics of the helical antenna. Since a general helical antenna is implemented in a form in which a coil is wound around a direction perpendicular to the mounting surface, Since the helical antenna 100 having a cylindrical structure can be manufactured and the thickness of the whip-type antenna 110 can be reduced due to the development of the material, the whip-type antenna 110 can be inserted into the center portion of the cylindrical helical antenna 100. Combinations of methods can be applied. At this time, since at least a coil portion of the helical antenna 100 is protected by the protective case, the whip-type antenna 110 may be electrically isolated from the inside of the helical antenna 100. In addition, the method of drawing out / retracting the flexible antenna located inside the helical antenna 100 has been used in the conventional single mode terminal, and thus there is no objection to its operation.

Therefore, the whip-type antenna 110 is configured to pass inside the helical antenna 100 having an empty inside as shown on the right side, and the whip-type antenna 110 can be pulled in / out of the terminal as needed. In addition, when the feed points f1 and f2 for each antenna 100 and 110 are individually designated and connected to the internal communication unit, a single structure antenna of a so-called dual body dual feeding method may be obtained. do. That is, in terms of electrical signals for communication, antennas that are isolated from each other, but antennas that can be configured as a structure can be obtained. Applicable when integrated in the terminal.

In particular, as shown in FIG. 4, when a separate antenna is mounted on each of portable communication devices, serious problems such as volume increase of the entire terminal and limitation of design may occur, as well as an aesthetic point of view. The unacceptable architecture allows the receiver to maintain high reception performance for both bands while minimizing the increase in handset volume and design difficulty.

As described above, the present invention provides a method for configuring an antenna for dual band communication, and an antenna for the same. A whip antenna for receiving a broadcast service using a low frequency band and a helical antenna for supporting a mobile communication service using a high frequency band are provided. By combining them in a separate structure to form a single structure, and then connecting each feed point with a dedicated communication module, the user feels as a single antenna, but in reality it acts as if two different types of antennas are each configured There is an effect that can bring a lot of improvements in terms of perspective and actual mounting space and design.

Claims (8)

Configuring an external shape of each antenna such that a first antenna corresponding to a predetermined frequency band and a second antenna corresponding to a lower frequency band than the first antenna are structurally coupled to each other to form a single antenna shape; Coupling the first antenna and the second antenna to be electrically isolated; And separately designating the first antenna feed point and the second antenna feed point to connect the antennas to predetermined communication means, respectively. The method of claim 1, wherein one of the first antenna and the second antenna is a helical antenna having an empty interior, and the other is a whip antenna passing through the helical antenna. . The method of claim 1, wherein the resonant frequency of the first antenna is at least several times the resonant frequency of the second antenna. 4. The method of claim 3, wherein the helical antenna is an antenna for a mobile communication terminal, and the whip antenna is a broadcast reception antenna. A first antenna corresponding to a predetermined frequency band; A second antenna structurally coupled with the first antenna to share a mounting position and corresponding to a lower frequency band than the first antenna; The antenna for dual band communication, characterized in that consisting of feed points formed in each of the first antenna and the second antenna. The antenna of claim 5, wherein the first antenna is in the form of a helical antenna having an empty cylindrical structure, and the second antenna is in the form of a whip antenna extending through an empty cylinder of the first antenna. The point is an antenna for dual band communication, characterized in that it is electrically separated. 6. The antenna of claim 5, wherein the second antenna has a retractable structure so that the user can draw in and out of the terminal when necessary. 6. The antenna of claim 5, wherein the first antenna is a helical antenna for mobile communication in a GHz band, and the second antenna is a whip antenna for broadcast reception in a few hundred MHz band.

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