JP2011193411A - Radio base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the need to change the design of an entire radio base station in accordance with requested characteristics, even while including a unit of which the shape is changed depending upon e.g., electrical requested characteristics. <P>SOLUTION: A radio base station (1) includes: a first unit (1100) of which the size is fixed regardless of requested characteristics; and a second unit (1200) of which the size is varied in accordance with the requested characteristics and which is externally mounted to the first unit. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technical field of a radio base station used in a radio communication system such as a mobile phone.

  As wireless base stations used in wireless communication systems such as mobile phone systems, outdoor wireless base stations installed outside buildings (outdoors) and indoor wireless base stations installed inside buildings (indoors) are known. It has been. An outdoor wireless base station is directly exposed to an external environment such as wind and rain, and is required to ensure waterproofness, corrosion resistance, and dustproofness.

  On the other hand, the radio base station incorporates a filter unit having a filter characteristic corresponding to the frequency of the radio wave used by the radio base station. The size and mass of the filter unit vary depending on electrical requirements such as frequency band and attenuation.

Special table 2003-522457 gazette

  The shape of the filter unit (for example, size, mass, etc.) changes depending on the electrical requirements such as frequency band and attenuation, so the radio base station The specifications are very different. Alternatively, since the shape of the filter unit changes depending on the electrical required characteristics, the specifications of the radio base station are greatly different for each characteristic required by the radio base station. More specifically, for example, since the shape of the filter unit is changed, the shape of the radio base station incorporating the filter unit is also greatly changed. For this reason, a radio base station will be redesigned for every provider or for every required characteristic.

  On the other hand, instead of redesigning the radio base station, preparing a radio base station that can incorporate filter units of various sizes can be considered as one countermeasure. However, in order to incorporate filter units of various shapes, the largest radio base station capable of incorporating the largest filter unit is prepared. For this reason, when a relatively small filter unit is built in, a useless space is generated inside the radio base station. That is, the size of the radio base station becomes larger than necessary. This may cause the wireless base station to lose its competitiveness (for example, cost competitiveness or competitiveness in terms of installation area / volume).

  In addition, the above-described problem applies not only to the filter unit but also to various units (or various devices) whose shapes change depending on electrical requirements.

  Examples of problems to be solved by the present invention include the above. An object of the present invention is to provide a radio base station that has a unit whose shape changes depending on, for example, electrical requirements, but can eliminate the need for a design change of the entire radio base station. To do.

  The above-described problem can be solved by a radio base station including a first unit and a second unit. The first unit is a unit whose shape is fixed regardless of required characteristics (for example, electrical characteristics such as frequency characteristics and attenuation). In other words, the first unit is a unit that does not need to change its shape even when required characteristics have changed. On the other hand, the second unit is a unit whose shape changes depending on required characteristics. In other words, the second unit is a unit that preferably changes (or needs to change) when the required characteristics change. The second unit is externally attached to the first unit. That is, the second unit is externally attached to the first unit so as to be located outside the first unit without being included in the first unit (in other words, being included).

  According to the radio base station described above, the second unit whose shape changes according to required characteristics can be externally attached to the first unit. Therefore, even if the shape of the second unit changes according to the required characteristics, it is not necessary to change the design of the first unit. In other words, even if the shape of the second unit changes according to the required characteristics, it is sufficient to change the design of the second unit alone.

  In addition, the second unit that can take various sizes need not be incorporated in the first unit. For this reason, it is not necessary to prepare the largest 1st unit which can incorporate the 2nd unit which can take various shapes. For this reason, the disadvantage that the size of the radio base station becomes larger than necessary can be suitably suppressed.

It is a perspective view which shows the external appearance of the wireless base station of this embodiment. FIG. 2 is a perspective view showing an appearance of the radio base station when the radio base station shown in FIG. 1 is observed from the direction of arrow A. It is a perspective view which shows the external appearance of the housing | casing of a basic unit. FIG. 2 is a part of an I-I ′ sectional view of the radio base station shown in FIG. 1. It is a perspective view which shows the external appearance of an external unit. 6 is a plan view showing an external appearance of the external unit when the external unit shown in FIG. 5 is observed from the direction of arrow B. FIG. FIG. 6 is a V-V ′ sectional view of the external unit shown in FIG. 5. It is a perspective view which shows the external appearance of the radio base station of a modification. It is a perspective view which shows the external appearance of the radio base station of a modification.

  Hereinafter, an embodiment of the radio base station 1000 will be described as an example of the best mode for carrying out the present invention with reference to the drawings.

  With reference to FIG.1 and FIG.2, the radio base station 1000 of this embodiment is demonstrated. Here, FIG. 1 is a perspective view showing the appearance of the radio base station 1000 of the present embodiment, and FIG. 2 is a radio base station 1000 when the radio base station 1000 shown in FIG. It is a perspective view which shows the external appearance.

  As shown in FIGS. 1 and 2, the radio base station 1000 includes a basic unit 1100 that is an example of a “first unit” and an external unit 1200 that is an example of a “second unit”. ing. The radio base station 1000 is a radio base station that performs radio communication with a communication terminal such as a mobile phone or a PHS, for example.

  The basic unit 1100 is a base station unit that does not need to change its size (or its physical shape) regardless of the electrical characteristics required for the radio base station 1000. In other words, the basic unit 1100 is a base station that does not need to change the size or the like (or need not change) even when the electrical characteristics required for the radio base station 1000 change. Is a unit. The basic unit 1100 is a basic processing circuit 1110 including various circuit components necessary for performing predetermined wireless processing or signal processing (however, it is not shown in FIGS. 1 and 2 because it is covered with a heat sink 1130, 4), and a housing 1120 that houses the basic processing circuit 1110, and a heat sink 1130 that releases heat generated in the basic processing circuit 1110 to the outside of the housing 1120.

  It is preferable (or needs to change) the size (or physical shape, etc.) of the external unit 1200 according to the electrical characteristics required for the radio base station 1000. It is a base station unit. In other words, the external unit 1200 preferably changes (or needs to change) the size or the like when the electrical characteristics required for the radio base station 1000 change. It is. The external unit 1200 includes an external processing circuit 1210 including various circuit components necessary for performing predetermined wireless processing or signal processing (however, in FIG. 1 and FIG. And a housing 1220 for housing the external processing circuit 1210. FIG. An example of the external unit 1200 is a filter unit that performs a filtering process. In this example, the external unit 1200 performs a filtering process on the signal transferred from the basic unit 1100, and sends the filtered signal to a signal not shown via a cable (not shown) connected to the antenna connector 1228. Transfer to the antenna shown. Similarly, the external unit 1200 performs a filtering process on a signal transferred from an antenna (not shown) via a cable (not shown) connected to the antenna connector 1228 and outputs the signal subjected to the filtering process to the basic unit. Transfer to 1100. Of course, as the external unit 1200, any processing unit that performs processing other than the filtering processing may be employed.

  In addition, as the radio base station 1000 of the present embodiment, a radio base station in which a radio device (RE: Radio Equipment) and a radio control device (REC: Radio Equipment Controller) are separated may be employed. In this case, for example, the entire radio base station 1000 illustrated in FIGS. 1 and 2 may be configured to correspond to, for example, a radio apparatus. Specifically, for example, the basic unit 1100 may be configured to perform wireless processing (for example, amplification processing) other than filtering processing while the external unit 1200 performs filtering processing of wireless processing. . Alternatively, for example, the external unit 1200 includes a wireless processing circuit whose size or the like changes according to electrical characteristics as the external processing circuit 1210, while the basic unit 1100 does not depend on electrical characteristics. A wireless processing circuit that does not need to change in size or the like may be included as the basic processing circuit 1110.

  Alternatively, as the radio base station 1000 of this embodiment, a radio base station in which the radio device and the radio control device are not separated may be employed. In this case, for example, the external unit 1200 may correspond to a wireless device, and the basic unit 1100 may correspond to a wireless control device. Specifically, the external unit 1200 performs wireless processing including filtering processing and amplification processing, while the basic unit 1100 performs various signal processing (for example, baseband processing, modulation processing, etc.), wireless device control processing, and the like. It may be configured to do.

  Of course, the configuration of the above-described wireless base station 1000 associated with the wireless device and the wireless control device is an example, and it goes without saying that any configuration may be adopted. However, while the basic unit 1100 does not have to change its size according to the electrical characteristics required for the radio base station 1000, the external unit 1200 is required for the radio base station 1000. It is still preferable to change the size according to the electrical characteristics.

  Next, the housing 1120 of the basic unit 1100 will be described with reference to FIG. FIG. 3 is a perspective view showing the appearance of the housing 1120 of the basic unit 1100.

  As shown in FIG. 3, the housing 1120 of the basic unit 1100 has a box-shaped structure including a gap 1121 in which the basic processing circuit 1110 is housed, and an overhanging portion 1122 for attaching the external unit 1200. It has a structure provided at the left and right ends of the box structure. However, the shape of the housing 1120 illustrated in FIG. 3 is an example, and a housing of an arbitrary shape may be employed. The housing 1120 includes connector through holes 1123 for connecting signal lines from the outside of the radio base station 1000 to various connectors 1128 included in the basic processing circuit 1110.

  An opening 1124 for connecting the signal line from the external processing circuit 1210 included in the external unit 1200 to the basic processing circuit 1110 is formed in the overhang portion 1122.

  Further, a screw hole 1125 for fixing the external unit 1200 to the basic unit 1100 is formed in the peripheral portion of the overhang portion 1122. FIG. 3 shows an example in which six screw holes 1125 are formed in each overhang portion 1122. The plurality of screw holes 1125 (or two screw holes 1125 of the plurality of screw holes 1125) are formed on the plane that forms the overhang portion 1122 (in other words, the opening 1124 formed in the overhang portion 1122. It is preferable that it is formed vertically symmetrical or horizontally symmetrical with respect to the plane to be formed). In other words, the plurality of screw holes 1125 (or two screw holes 1125 of the plurality of screw holes 1125) are formed in line symmetry with respect to a line passing through the center of the plane forming the overhang portion 1122. It is preferable.

  Further, a packing groove 1126 in which a later-described packing 1227 is installed is provided around the periphery of the overhang 1122 so as to form a closed loop including an opening 1124 inside the loop. The packing 1227 is installed so as to fit in the packing groove 1126 when the external unit 1200 is fixed to the basic unit 1100.

  Next, the external unit 1200 will be described in more detail with reference to FIGS. 4 to 7. 4 is a part of a cross-sectional view taken along the line II ′ of the radio base station 1000 shown in FIG. 1, FIG. 5 is a perspective view showing the external appearance of the external unit 1200, and FIG. 5 is a plan view showing the external appearance of the external unit 1200 when the external unit 1200 shown in FIG. 5 is observed from the direction of arrow B, and FIG. 7 is a cross-sectional view of the external unit 1200 shown in FIG. is there.

  As shown in FIGS. 4 to 7, the casing 1220 of the external unit 1200 has a substantially rectangular parallelepiped box in which one surface facing the basic unit 1100 is an opening 1224 and the other five surfaces are covered with a fixed wall. Has the shape of a mold. However, the shape of the housing 1220 illustrated in FIGS. 4 to 7 is an example, and a housing having an arbitrary shape including the opening 1224 may be employed.

  The external processing circuit 1210 is installed in the space 1221 inside the housing 1220. The external processing circuit 1210 is an adjustment screw 1230 for adjusting characteristics (for example, filter characteristics) in the external processing circuit 1210 (however, not shown in FIG. 4 and shown in FIGS. 5 to 7). Have). The adjustment screw 1230 is attached to the outside of the housing 1220 (in other words, the adjustment screw 1230 can be operated from the outside of the external unit 1200 through the opening 1224). The circuit 1210 is provided. The external processing circuit 1210 includes an input / output connector 1231 for attaching a signal line from the basic unit 1100. Therefore, the space 1224 of the housing 1220 preferably has a size that can accommodate the input / output connector 1231 and signal lines attached to the input / output connector in addition to the external processing circuit 1210.

  The housing 1220 is formed with an overhang (flange) 1222 for attaching the external unit 1200 to the basic unit 1100 so as to surround the opening 1224. The housing 1220 includes a connector through-hole for connecting a signal line to a connector (for example, an antenna connector 1228 or a monitor connector 1229) included in the external processing circuit 1210.

  A screw hole 1225 for fixing the external unit 1200 to the basic unit 1100 is formed in the overhang portion 1222 of the housing 1220. The screw hole 1225 is formed in the overhanging portion 1222 so as to correspond to the screw hole 1125 provided in the housing 1120 of the basic unit 1100 (in other words, the position coincides). Note that the plurality of screw holes 1225 are formed vertically symmetrically or horizontally symmetrically with respect to a plane that forms the overhanging portion 1222 (in other words, a plane that forms the opening 1224 formed in the overhanging portion 1222). It is preferable. In other words, the plurality of screw holes 1225 are preferably formed symmetrically with respect to a line passing through the center of the plane that forms the overhang portion 1222.

  The overhanging portion 1222 is provided with a packing 1227 in a circular shape (in other words, so as to form a closed loop including the opening 1224 inside). The packing 1227 is a pressure-bonding member for ensuring waterproofness, dustproofness, anticorrosiveness, and the like inside the housing 1220 (that is, the gap 1221 in which the filter processing circuit 1210 is installed). The packing 1227 is made of, for example, rubber or resin. In addition, the groove for packing in which the packing 1227 is installed may or may not be provided in the overhanging portion 1222 in a circular shape.

  However, in addition to or instead of the packing 1227, an adhesive resin may be used to ensure waterproofness, dustproofness, corrosion resistance, and the like inside the housing 1220. Alternatively, in addition to or instead of the packing 1227, strong adhesion between the overhanging portion 1122 of the basic unit 1100 and the overhanging portion 1222 of the external unit 1200 (for example, strong adhesion by screwing using a mounting screw) ) To ensure waterproofness, dustproofing, anticorrosion and the like inside the housing 1220. In any case, as long as waterproofness, dustproofness, corrosion resistance, and the like inside the housing 1220 can be secured (in other words, unless the inside of the housing 1220 is directly exposed to an external environment such as wind and rain, solar radiation). Any configuration may be adopted in addition to or instead of the packing 1227.

  Further, as shown in FIG. 7, the top of the adjustment screw 1230 (particularly, the top in the direction toward the outside of the housing 1220) is a plane constituted by the opening 1224 (or a plane constituted by the overhanging portion 1222). ) From the outside to the outside. Alternatively, the top portion of the structure of the external processing circuit 1210 is not limited to the adjustment screw 1230, and the top portion of the structure of the external processing circuit 1210 does not protrude outward from the plane configured by the opening 1224 (or the plane configured by the projecting portion 1222). Is preferred. That is, it is preferable that the external processing circuit 1210 is configured not to interfere with the fixing operation when the external unit 1200 is fixed to the basic unit 1100.

  The basic unit 1100 and the external unit 1200 are physically fixed by mounting screws using a screw hole 1125 provided in the basic unit 1100 and a screw hole 1225 provided in the external unit 1200. Further, signal lines attached to the input / output connector 1231 provided in the external unit 1200 are attached to various connectors of the basic processing circuit 1110 provided in the basic unit 1100 through the openings 1124 and 1224.

  As described above, according to the radio base station 1000 of the present embodiment, the basic unit 1100 and the external unit 1200 are physically separated, and the external unit 1200 is externally attached to the basic unit 1100. be able to. For this reason, even if the shape of the external unit 1200 changes depending on the electrical requirements, the design of the basic unit 1100 need not be changed. In other words, even if the shape of the external unit 1200 changes depending on the electrical requirement characteristics, it is sufficient to change the design of the external unit 1200 alone. Therefore, if the external unit 1200 is changed, it is possible to easily cope with detailed specification changes of various operators using the radio base station 1000.

  In addition, according to the radio base station 1000 of this embodiment, since the external unit 1200 can be externally attached to the basic unit 1100, the basic unit 1100 can be used regardless of whether or not the design of the external unit 1200 is changed. The casing 1120 can be manufactured using a common mold. In other words, according to the radio base station 1000 of the present embodiment, the casing 1120 of the basic unit 1100 can be diverted regardless of whether or not the design of the external unit 1200 is changed. For example, the housing 1120 of the common basic unit 1100 can be used for each of a radio base station using a frequency of 1.5 GHz band and a radio base station using a frequency of 2.0 GHz band. Therefore, the cost (for example, cost and manufacturing process cost) of the radio base station 1000 as a whole can be relatively reduced.

  In addition, according to the radio base station 1000 of the present embodiment, since the external unit 1200 can be externally attached to the basic unit 1100, the housing of the basic unit 1100 according to the maximum size of the external unit 1200. 1120 may not be manufactured. For this reason, it is possible to reduce the size of the basic unit 1100 (further, the radio base station 1000 including the basic unit 1100).

  In addition, according to the radio base station 1000 of the present embodiment, since the external unit 1200 can be fixed outside the basic unit 1100, an antenna connector provided in the external unit 1200 with a signal line from an antenna (not shown). Can be attached directly to 1228. For this reason, the transmission loss in the signal transmission from the antenna can be relatively reduced.

  Further, according to the radio base station 1000 of the present embodiment, by using the packing 1227 or the like, it is possible to suitably ensure waterproofness, dustproofness, corrosion resistance, and the like inside the housing 1220 of the external unit 1200. Therefore, even if the external unit 1200 including the external processing circuit 1210 is externally attached to the basic unit 1100, the external processing circuit 1210 is provided with a housing 1220 that is waterproof, dustproof, anticorrosive, and the like. Installed in the inner part. For this reason, the external processing circuit 1210 itself is not directly exposed to the external environment such as wind and rain. For this reason, even if the external unit 1200 is externally attached to the basic unit 1100, there is little or no adverse effect on the operation of the external processing circuit 1210.

  Further, according to the radio base station 1000 of the present embodiment, the top of the structure of the external processing circuit 1210 is located on the inner side of the housing 1220 than the plane formed by the opening 1224. For this reason, when the external unit 1200 is fixed to the basic unit 1100, the external processing circuit 1210 has little or no interference with the fixing operation.

  Further, according to the radio base station 1000 of the present embodiment, the screw holes 1125 and 1225 used when fixing the external unit 200 to the basic unit 1100 are formed so as to be vertically symmetric or horizontally symmetric. The For this reason, even if the direction of the external unit 1200 is reversed upside down or horizontally reversed, the position of the screw hole 1225 as a whole does not change. Therefore, even if the orientation of the external unit 200 is reversed upside down or left and right, the external unit 1200 can be suitably fixed to the basic unit 1100. More specifically, for example, in the radio base station 1000 shown in FIGS. 1 and 2, the antenna connector 1228 of the external unit 1200 and the various connectors 1128 of the basic unit 1100 are oriented in the same direction. On the other hand, in the radio base station 1001 of the modification shown in FIG. 8, the external unit 1200 is turned upside down compared to the radio base station 1000 shown in FIGS. That is, in the radio base station 1001 shown in FIG. 8, the antenna connector 1228 of the external unit 1200 and the various connectors 1128 of the basic unit 1100 are oriented in opposite directions. Thus, since the orientation of the external unit 1200 can be changed as appropriate, it is possible to easily cope with detailed specification changes of various operators using the wireless base station 1000 while using the common external unit 1200. it can.

  The above description shows the radio base station 1000 in which the external unit 1200 is fixed to the left and right ends of the basic unit 1100. However, as long as the waterproofness, dustproofness, corrosion resistance, and the like of the external processing circuit 1210 installed in the housing 1220 of the external unit 1200 are ensured, the external unit 1200 becomes the basic unit 1100 in other modes. It may be attached to. For example, as shown in FIG. 9, even if the single external unit 1200 is a radio base station 1002 fixed on one surface of the basic unit 1100, the above-described various effects can be enjoyed. Thereby, it can respond appropriately by the detailed specification change of the various operators who use the wireless base station 1000.

  Regarding the embodiment described above, the following additional notes are disclosed.

(Appendix 1)
A first unit having a fixed size regardless of the required characteristics; and a second unit having a variable size according to the required characteristics and externally attached to the first unit. A wireless base station characterized by.

(Appendix 2)
The second unit includes a casing part including an outer edge part that contacts the first unit when attached to the first unit, and a circuit installed in an inner part of the casing part located inside the outer edge part. The wireless base station according to supplementary note 1, wherein a crimping member that crimps the outer edge portion and the first unit is installed on the outer edge portion.

(Appendix 3)
The crimping member is formed on the outer edge portion so as to form a closed loop, and connects the circuit unit and the circuit unit included in the first unit at a position corresponding to the inside of the closed loop of the housing unit. The radio base station as set forth in appendix 2, wherein an opening is formed.

(Appendix 4)
The second unit is a housing part in which an opening is formed, and a housing part attached to the first unit so that the opening faces the first unit, and an inner side of the housing part And (i) the inner part of the casing part in which the circuit part is installed is not directly exposed to the external environment, and (ii) the circuit part is provided with a circuit part installed in the part. The radio base station according to appendix 1, wherein an outer portion of the casing portion on the side opposite to the installation side is directly exposed to an external environment.

(Appendix 5)
The housing portion forms an outer edge of the opening and is in contact with the first unit when attached to the first unit, and is installed on the outer edge portion and the outer edge portion and the first unit. The radio base station according to appendix 4, further comprising: a crimping member that crimps.

(Appendix 6)
The radio base station according to any one of appendices 3 to 5, wherein a top portion of the circuit portion on the opening portion side is located in the inner portion with respect to a plane including the opening portion.

(Appendix 7)
The housing portion includes a plurality of attachment portions for attaching the housing portion to the first unit so that the opening portion faces the first unit, and at least of the plurality of attachment portions. The radio base station according to any one of appendices 3 to 6, wherein the two attachment portions are provided at positions symmetrical with respect to the center of the opening.

(Appendix 8)
The radio base station according to any one of appendices 1 to 7, wherein the second unit includes a filter unit that performs a filtering process.

(Appendix 9)
The first unit includes: a first housing portion including a first outer edge portion that contacts the second unit when the second unit is attached; and a first housing portion positioned inside the first outer edge portion. A second circuit portion including a second outer edge portion that contacts the first outer edge portion when attached to the first unit; and A crimping member that crimps the first outer edge portion and the second outer edge portion, and a second circuit portion that is installed in an inner portion of the second housing portion located inside the outer edge portion. The radio base station according to appendix 1, wherein the radio base station is installed on at least one of the first outer edge portion and the second outer edge portion.

(Appendix 10)
The crimping member is formed on at least one of the first outer edge portion and the second outer edge portion so as to constitute a closed loop, and is positioned at a position corresponding to the inner side of the closed loop of the first housing portion. A first opening for connecting the circuit unit and the second circuit unit is formed, and the first circuit unit and the second circuit are located at a position corresponding to the inside of the closed loop of the second housing unit. The radio base station according to appendix 9, wherein a second opening for connecting the first and second sections is formed.

(Appendix 11)
The first unit is a first housing part in which a first opening is formed, and the first housing part to which the second unit is attached so that the first opening faces the second unit. And a first circuit portion installed in an inner portion of the first housing portion, wherein the second unit is a second housing portion in which a second opening is formed and the second opening. A second housing portion attached to the first unit so that a portion faces the first opening, and a second circuit portion installed in an inner portion of the second housing portion, With the opening as a boundary, (i) the inner part of the second casing part where the second circuit part is installed is not directly exposed to the external environment, and (ii) the side where the second circuit part is installed The radio base station according to appendix 1, wherein an outer portion of the second casing portion on the opposite side is directly exposed to an external environment. .

(Appendix 12)
The first housing portion includes a first outer edge portion that forms an outer edge of the first opening and contacts the second unit when the second unit is attached, and the second housing portion includes the second housing portion. A second outer edge portion that forms an outer edge of the opening and contacts the first unit when attached to the first unit, wherein at least one of the first housing portion and the second housing portion is the first The radio base station according to claim 11, further comprising a crimping member that crimps an outer edge portion and the second outer edge portion.

(Appendix 13)
13. The radio according to any one of appendices 10 to 12, wherein a top portion of the second circuit portion on the second opening side is located in the inner portion with respect to a plane including the second opening. base station.

(Appendix 14)
The second housing portion includes a plurality of attachment portions for attaching the second housing portion to the first unit so that the second opening portion faces the first unit, and the plurality of attachment portions 14. The radio base station according to any one of appendices 10 to 13, wherein at least two of the attachment portions are provided at positions symmetrical with respect to a center of the second opening.

1000 Radio base station 1100 Basic unit 1110 Basic processing circuit 1120 Housing 1122 Overhang 1124 Opening 1125 Screw hole 1126 Packing groove 1200 External unit 1210 External processing circuit 1220 Housing 1222 Overhang 1224 Opening 1225 Screw hole 1227 Packing 1230 Adjustment screw

Claims (8)

A first unit whose shape is fixed regardless of the required characteristics;
A radio base station comprising: a second unit that changes shape according to required characteristics and is externally attached to the first unit. The second unit includes a casing part including an outer edge part that contacts the first unit when attached to the first unit, and a circuit installed in an inner part of the casing part located inside the outer edge part. With
The radio base station according to claim 1, wherein a crimping member that crimps the outer edge portion and the first unit is installed on the outer edge portion. The crimping member is formed on the outer edge portion to form a closed loop;
The opening part for connecting the said circuit part and the circuit part with which the said 1st unit is provided is formed in the position corresponding to the inside of the said closed loop of the said housing | casing part, The Claim 2 characterized by the above-mentioned. Wireless base station. The second unit is a housing part in which an opening is formed, and a housing part attached to the first unit so that the opening faces the first unit, and an inner side of the housing part A circuit part installed in the part,
With the opening as a boundary, (i) the inner part of the casing part where the circuit part is installed is not directly exposed to the external environment, and (ii) the casing on the side opposite to the side where the circuit part is installed The radio base station according to claim 1, wherein an outer part of the body part is directly exposed to an external environment.   The housing portion forms an outer edge of the opening and is in contact with the first unit when attached to the first unit, and is installed on the outer edge portion and the outer edge portion and the first unit. The radio base station according to claim 4, further comprising: a crimping member that crimps the base station.   6. The radio base station according to claim 3, wherein a top portion of the circuit portion on the opening portion side is located in the inner portion with respect to a plane including the opening portion. The housing portion includes a plurality of attachment portions for attaching the housing portion to the first unit such that the opening portion faces the first unit.
The radio base station according to claim 3, wherein at least two of the plurality of attachment portions are provided at positions symmetrical with respect to a center of the opening. .   The radio base station according to claim 1, wherein the second unit includes a filter unit that performs a filtering process.

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