CA2080934C - Antenna for a radio base station - Google Patents
Antenna for a radio base stationInfo
- Publication number
- CA2080934C CA2080934C CA002080934A CA2080934A CA2080934C CA 2080934 C CA2080934 C CA 2080934C CA 002080934 A CA002080934 A CA 002080934A CA 2080934 A CA2080934 A CA 2080934A CA 2080934 C CA2080934 C CA 2080934C
- Authority
- CA
- Canada
- Prior art keywords
- antenna
- base station
- radio base
- attaching portions
- base plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000005855 radiation Effects 0.000 claims abstract description 25
- 238000010586 diagram Methods 0.000 description 9
- 230000001413 cellular effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
Classifications
-
- Y02B60/50—
Landscapes
- Aerials With Secondary Devices (AREA)
Abstract
An antenna for a radio base station comprising a base plate having a limited length; attaching portions provided in the base plate and arranged in a longitudinal direction and a transverse direction of the base plate at intervals of approximately a quarter of a wavelength of an electromagnetic wave; radiation elements provided at first selected ones of the attaching portions; and stick-like non-power-feeding reflectors or directors attached to second selected ones of the attaching portions surrounding the radiation elements, thereby providing a desired directivity thereof.
Description
- 2~8~93~
TITLE OF THE INVENTION
ANTENNA FOR A RADIO BASE STATION
BACKGXOUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to an antenna for a radio base station as in a mobile radio communication.
DISCUSSION OF BACKGROUND
Figure 11 designates a construction diagram showing an example of a conventional antenna for a radio base station. In Figure 11, notations 4a to 4c designate antennae having an omni-directionality with respect to a hori~ontal plane, which are connected to power feeding circuits 5a to 5c for exciting the antennae. Notations lS 6a to 6c designate phase shifters, for varying excitation phases of the respective antennae 4a to 4c, which are connected to the power feeding circuits 5a to 5c and to a connecting and distributing circuit 7 which performs connection and distribution of RF (radio frequency carrier wave) signalsO A phase controlling circuit 8 controls the phases of the signals to be fed to the respective antennae 4a to 4c, which is connected to the respective phase shifters 6a to 6c.
The operation is as follows. In Figure 11, the antennae 4a to 4c are excited by the respective feeding circuits Sa to Sc. As shown in Figure 12, two pieces of antennae ~aving the same characteristic, are arranged at ;. ;. - : : :
. . I .. .
.... , ~, . . ..
.: . ' ~ :,, :
. :~. ~ . .
: , 9 ~ ~ :
an interval of A/2 (m) in a phase relationship under which the respective antennae are excited~ A figure-8 type characteristic can be obtained by feeding powers of the same phase to the respective antennae. As shown in an Example of Figure 12, the antennae 4a and 4b having the same characteristic are arranged at a pertinent interval, for instance, A/2 (m), the phase relationship of the signals to be fed to the respective antennae 4a and 4b to provide an aimed directivity, is varied by the phase shifters thereby obtaining various directivities.
In Figure 11, the phaae shifters 6a to 6c are installed in accordance with the respective antennae 4a to 4c, the phase shifting amounts of the phase shifters 6a to 6c are controlled by the phase controlling ~ircuit 8, thereby obtaining various directivities. The connecting and distributing circuit 7 is a distributor for connecting powers received by the antennae 4a to 4c, or conversely, supplying a transmitting radio carrier wave to the antennae 4a to 4c, which may include switching portions for selecting the antennae in accordance with the necessity.
Since the conventional antennae for a radio base station is constructed as above, in case of providing a directivity to the antennae in a desired single direction or a plurality of directions, it is necessary to install the phase shifters 6a to 6c, the power feeding circuits 5a to 5c and the phase controlling circuit 8 respectively . ' .
, -3 ~
to the antennae 4a to 4c for excitation. Therefore, there is a hazard against the downsizingr the price reduction and the low power consumption of equipments~
SUMMARY OF THE INVENTION
It is an o~ject of the present invention to solve the above problems and to provide an antenna for a radio base station capable of providing desired various directivities and realizing the downsizingr the price reduction and the low power consumption of equipments.
According to a first aspect of the present invention, there is provided an antenna for a radio base station compri 5 ing:
a base plate having a limited length;
attaching portions provided in the base plate and arran9ed in a longitudinal direction and a transverse direction of the base plate at intervals of approximately a ~uarter of a wavelength of an electromagnetic wave;
radiation elements provided at first selected ones of the attaching portions; and stick-like non-power-feeding reflectors or directors attached to second selected ones of the attaching portions surrounding the radiation elements, thereby providing a desired directivity thereof.
According to a second aspect of the present invention, there is provided the antenna for a radio base station according to the first aspect, wherein the attaching portions are formed in a sleeve antenna.
.. ~,.
2 ~ 3 ~
According to the antenna for a radio base station of the first aspect, by setting the attaching portions of the non-power-feeding reflectors 9 or the directors 10 surrounding the radiation elements at predetermined positions, a directivity in accordance with the positions, can be provided.
According to the antenna for a radio base station of the second aspect, by setting the attaching positions of the non-power-feeding reflectors or the directors arranged ~round the radiation elements in the sleeve antenna, to predetermined positions a directivity of the sleeve antenna in accordance with the positions, can be obtained~
BRI~F DESCRIPTION OF THE DRAWINGS
Figure l is a construction diagram showing an embodiment of an antenna for a radio base station according to the present invent.ion;
Figure 2 is a sectional diagram showing an example of an attaching portion according to the present invention;
Figure 3 i5 a diagram for explaining operations of a non-power-feeding reflector and a director according to the present invention;
Figure 4 is a plane showing an example of a single lobe directivity;
Figure 5 is a plane showing an example of a figure-8 type characteristic;
Figure 6 is a plane showing an example of a petal '. ~ :' , .
, 3 ~
like characteristic;
Figure 7 is a diagram for explaining an installation place of a radio base station of this kind;
Figure 8 is a plane showing another embodiment of an antenna for a radio base station according to the present invention;
Figure 9 is a sectional diagram showing another example of an antenna for a radio base station according to the present invention;
Figure 10 is a sectional diagram showing another example oE an attaching portion according to the present invention;
Figure 11 is an outline construction diagram showing an example of a conventional antenna for a radio base lS station; and Figure 12 is a diagram for explainin~ operation of the conventional antenna for a radio base station~
~ E~TT.~n DESCRIPrTION OF THE PREFERRED EMBODIMENT~
Figure 1 shows an embodiment of an antenna for a radio base station according to the present invention.
In Figure 1, a reference numeral 1 designates a radiation element, which is connected to a power feeding circuit 3.
A numeral 2 designates a tapped hole as an attachiny ;
portionr which .is formed in a base plate 33, as shown in Figure 2. By these tapped holes, non-power-feeding reflectors 9 or directors 10 can arbitrarily be f.ixed to positions for providing an aimed directivity.
, - -~
, - ~ .
2~93~
Furthermore, these tapped holes 2 are arranged in the longitudinal direction and in the transverse direction of the base plate at intervals of about A/4 (m). The non-power-feeding reflectors 9 and the directors 10 are provided with male screws 29 as fixing portions to be screwed in the tapped holes 2. Furthermore, the base plate 33 is provided with a size of a limited length.
Furthermore, the radiation element 1 is also provided with the male screw 29 which is to be screwed in the attaching poxtion 2. ~owever, the radiation element 1 may be welded to the base plate 33.
The operation is as ~ollows. Explanation will be given to the operations of the reflector 9 such as the non-power-feeding reflector and the director 10 by referring to ~igure 3. Generally, the reflector 9 is provided with a length having an inductive reactance (for instance, about A/2. The electromagnetic wave is radiated from the radiation element 1 in the radial direction~ A distance between the radiation element 1 and the reflector 9 is A/4. Therefore, the radiated electromagnetic wave proceeds by A/4, and xeaches the reflector 9 while the phase angle thereof lags by 90~.
Furthermore, a voltage of which phase lags by 90~, is induced at the reflector 9 by the arriving electromagnetic wave. The phase of a current induced by the voltage further lags by 90~. Accordingly, the electromagnetic wave, the phase of which lags by 270~
~ .
_ 7 _ 2~
compared with that radiated from the radiation element 1, is radiated from the reflector 9. Since the phases of the electromagnetic waves in a range between of the radlation element 1 and the reflector 9 are mutually reversed, they cancel each other. The elect~omagnetic wave which is reflected by the reflector, is added to that radiated from the radiation element both in the same phase with respect to the right hand side direction of the radiation element. Furthermore, the director 10 is provided with a length having a capacitative reactance (for instance, not more than A/2). Therefore, a voltage of which phase angle lags by 180~ is induced in the director 10 as above, by the electromagnetic wave radiated from the radiation element 1. Since the director 10 is capacitative, the phase of the flowing current advances by 90~ (A/4-)~ Accordingly, since the electromagneti~ wave radiated from the director 10 shares ~:
the same phase with the electromagnetic wave radiated from the radiation element 1, the electromagnetic wave is strengthened in the right hand side direction. As stated above, when the single reflector 9 and the single director 10 are arranged respectively at the right hand side and the left hand side of the radiation element 1, the electromagnetic wave i9 provided with a single lobe characteristic as shown in Figure 4. When the number of the directors 10 is increased, a sharper directivity can be provided. As shown in Figure 5, when the directors 10 ":
, ~;
"
" :
"
:
2 ~
are arranged on the left hand side and the right hand side of the radiation element 1, and the reflectors 9 are arranged on the top side and on the bottom side thereof the figure-8 type characteristic can be obtained~ As S shown in Figure 6, when the directors 10 are arranged on the top side, on the bottom side, on the left hand side, and on the right hand side of the radiation element and the reflectors 9 are arran~ed between the respective directors, a petal-like characteristic can be obtained.
A mobile radio base station mounted with the antenna of this kind, is used in a cellular system of which service area is provided with a size of 100 to 200 m. As shown in Figure 7, a base station 34 is often installed at a telegraph poles 35 or at an edge portion of a building the height of which is about 3 to 5 m above the ground. Therefore, the electromagnetic wave is apt to be shielded by a building 36 or the like. The arriving direction of the electromagnetic wave is more or less limited by the positional environment. Therefore, when the mobile radio base station is provided with a directivity in accordance with the place thereof, a directivity gain based on the directivity enlarges the service area.
In the antenna for a radio base station according to the first aspect of the present invention, various directivities can be achieved by a combination of the non-power-feeding reflectors 9 and the directors 10 in ~ .
3 ~
g accordance with the installation place of the radio base stationr by attaching the ends of the stick-like non-power-feeding reflectors 9 or the directors 10 at selected ones of the attaching portions 2 as shown in Figure 1 and the enlarging of the service area in a fixed area of the cellular system can be achieved. Compared with the conventional example, the antenna of this invention can be achieved, for instance, by a single antenna having omni-directionality with respect to a horizontal plane, as the radiation element 1 and a single power-feeding circuit. Furthermore, the installation of the phase shifters 6a to 6c, the phase controlling circuit 8 or the like is not necessary, thereby achieving the downsizing, the cost reduction and the low consumption of power of the equipments.
Figures 8 and 9 show another embodiment of an antenna for a radio base station according to the present invention. In Figures 8 and 9, a reference numeral 24 designates a sleeve antenna haviny a skirt 24s. A
numeral 21 designates a radiation element which is integrated with an electronic circuit 26. Numerals 22a and 22b designate directors and 23a and 23b, non-power feeding reflectors. A numeral 27 designates an interface with a telephone network. A numeral 25 deslgnates an inner conductive body of the sleeve antenna, which achieves the weather resistance and the integration of the antenna and the circuit by incorporating the , " ' '' ~8~,93~
electronic circuit 26. Around the radiation element 21 of the sleeve antenna 24, tapped holes 28 are formed as attaching portions. As in the embodiment of Figure 1, the non-power-feeding reflectors 23a and 23b and the directors 22a and 22b are provided with male screws 29 as fixing portions to be screwed in the tapped holes 28.
Since the operation of this embodiment i5 the same with that in the embodiment of Figure 1, explanation thereof will be omitted. By arranging the non-power-feeding reflectors 23a and 23b and the directors 22a and22b as in Figure 8, the figure-8 type characteristic shown in Figure 5, is provided. Furthermore, when the tapped holes 28 as attaching portions are arranged on a circle as in Figure 6, the petal-like characteristic shown in Figure 6 ca~ be obtained.
An effect can be obtained in the above construction which is the same as that in the embodiment of Figure 1.
Furthermore, as shown in Figure 10, the tapped hole can be substituted by a through hole 30. Retaining pieces 31a and 31b having hooks 32a and 32b provided at ends of the non-power-feeding reflector 9 and the director 10 may be inserted into the through hole 30, in a single motion.
In the antenna for a radio base station of the first aspect oE the present invention, since a desired directivity can be obtained by attaching the stick like non-power-feeding reflectors or directors to selected ., .
.... .
;
2a~93~
attaching portions, this antenna can be constructed by a single radiation element and a single power-feeding circuit. It is not necessary to provide the phase shifter, the phase controlling circuit and the likeO The invention can achieve the downsizin~, the cost reduction and the low consumption of power of equipments, and capable of providing various directivities in accordance with the installation place of the radio base station and enlarging the service area of the mobile radio base station of a small cellular system, or the like.
In the antenna for a radio base station of the second aspect of the present invention, since the attaching portions are formed in the sleeve antenna, various directivities can be provided also ~y the sleeve antenna, and the service area of the mobile radio base station in a small cellular system, or-the like can be enlarged.
; , ~,
TITLE OF THE INVENTION
ANTENNA FOR A RADIO BASE STATION
BACKGXOUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to an antenna for a radio base station as in a mobile radio communication.
DISCUSSION OF BACKGROUND
Figure 11 designates a construction diagram showing an example of a conventional antenna for a radio base station. In Figure 11, notations 4a to 4c designate antennae having an omni-directionality with respect to a hori~ontal plane, which are connected to power feeding circuits 5a to 5c for exciting the antennae. Notations lS 6a to 6c designate phase shifters, for varying excitation phases of the respective antennae 4a to 4c, which are connected to the power feeding circuits 5a to 5c and to a connecting and distributing circuit 7 which performs connection and distribution of RF (radio frequency carrier wave) signalsO A phase controlling circuit 8 controls the phases of the signals to be fed to the respective antennae 4a to 4c, which is connected to the respective phase shifters 6a to 6c.
The operation is as follows. In Figure 11, the antennae 4a to 4c are excited by the respective feeding circuits Sa to Sc. As shown in Figure 12, two pieces of antennae ~aving the same characteristic, are arranged at ;. ;. - : : :
. . I .. .
.... , ~, . . ..
.: . ' ~ :,, :
. :~. ~ . .
: , 9 ~ ~ :
an interval of A/2 (m) in a phase relationship under which the respective antennae are excited~ A figure-8 type characteristic can be obtained by feeding powers of the same phase to the respective antennae. As shown in an Example of Figure 12, the antennae 4a and 4b having the same characteristic are arranged at a pertinent interval, for instance, A/2 (m), the phase relationship of the signals to be fed to the respective antennae 4a and 4b to provide an aimed directivity, is varied by the phase shifters thereby obtaining various directivities.
In Figure 11, the phaae shifters 6a to 6c are installed in accordance with the respective antennae 4a to 4c, the phase shifting amounts of the phase shifters 6a to 6c are controlled by the phase controlling ~ircuit 8, thereby obtaining various directivities. The connecting and distributing circuit 7 is a distributor for connecting powers received by the antennae 4a to 4c, or conversely, supplying a transmitting radio carrier wave to the antennae 4a to 4c, which may include switching portions for selecting the antennae in accordance with the necessity.
Since the conventional antennae for a radio base station is constructed as above, in case of providing a directivity to the antennae in a desired single direction or a plurality of directions, it is necessary to install the phase shifters 6a to 6c, the power feeding circuits 5a to 5c and the phase controlling circuit 8 respectively . ' .
, -3 ~
to the antennae 4a to 4c for excitation. Therefore, there is a hazard against the downsizingr the price reduction and the low power consumption of equipments~
SUMMARY OF THE INVENTION
It is an o~ject of the present invention to solve the above problems and to provide an antenna for a radio base station capable of providing desired various directivities and realizing the downsizingr the price reduction and the low power consumption of equipments.
According to a first aspect of the present invention, there is provided an antenna for a radio base station compri 5 ing:
a base plate having a limited length;
attaching portions provided in the base plate and arran9ed in a longitudinal direction and a transverse direction of the base plate at intervals of approximately a ~uarter of a wavelength of an electromagnetic wave;
radiation elements provided at first selected ones of the attaching portions; and stick-like non-power-feeding reflectors or directors attached to second selected ones of the attaching portions surrounding the radiation elements, thereby providing a desired directivity thereof.
According to a second aspect of the present invention, there is provided the antenna for a radio base station according to the first aspect, wherein the attaching portions are formed in a sleeve antenna.
.. ~,.
2 ~ 3 ~
According to the antenna for a radio base station of the first aspect, by setting the attaching portions of the non-power-feeding reflectors 9 or the directors 10 surrounding the radiation elements at predetermined positions, a directivity in accordance with the positions, can be provided.
According to the antenna for a radio base station of the second aspect, by setting the attaching positions of the non-power-feeding reflectors or the directors arranged ~round the radiation elements in the sleeve antenna, to predetermined positions a directivity of the sleeve antenna in accordance with the positions, can be obtained~
BRI~F DESCRIPTION OF THE DRAWINGS
Figure l is a construction diagram showing an embodiment of an antenna for a radio base station according to the present invent.ion;
Figure 2 is a sectional diagram showing an example of an attaching portion according to the present invention;
Figure 3 i5 a diagram for explaining operations of a non-power-feeding reflector and a director according to the present invention;
Figure 4 is a plane showing an example of a single lobe directivity;
Figure 5 is a plane showing an example of a figure-8 type characteristic;
Figure 6 is a plane showing an example of a petal '. ~ :' , .
, 3 ~
like characteristic;
Figure 7 is a diagram for explaining an installation place of a radio base station of this kind;
Figure 8 is a plane showing another embodiment of an antenna for a radio base station according to the present invention;
Figure 9 is a sectional diagram showing another example of an antenna for a radio base station according to the present invention;
Figure 10 is a sectional diagram showing another example oE an attaching portion according to the present invention;
Figure 11 is an outline construction diagram showing an example of a conventional antenna for a radio base lS station; and Figure 12 is a diagram for explainin~ operation of the conventional antenna for a radio base station~
~ E~TT.~n DESCRIPrTION OF THE PREFERRED EMBODIMENT~
Figure 1 shows an embodiment of an antenna for a radio base station according to the present invention.
In Figure 1, a reference numeral 1 designates a radiation element, which is connected to a power feeding circuit 3.
A numeral 2 designates a tapped hole as an attachiny ;
portionr which .is formed in a base plate 33, as shown in Figure 2. By these tapped holes, non-power-feeding reflectors 9 or directors 10 can arbitrarily be f.ixed to positions for providing an aimed directivity.
, - -~
, - ~ .
2~93~
Furthermore, these tapped holes 2 are arranged in the longitudinal direction and in the transverse direction of the base plate at intervals of about A/4 (m). The non-power-feeding reflectors 9 and the directors 10 are provided with male screws 29 as fixing portions to be screwed in the tapped holes 2. Furthermore, the base plate 33 is provided with a size of a limited length.
Furthermore, the radiation element 1 is also provided with the male screw 29 which is to be screwed in the attaching poxtion 2. ~owever, the radiation element 1 may be welded to the base plate 33.
The operation is as ~ollows. Explanation will be given to the operations of the reflector 9 such as the non-power-feeding reflector and the director 10 by referring to ~igure 3. Generally, the reflector 9 is provided with a length having an inductive reactance (for instance, about A/2. The electromagnetic wave is radiated from the radiation element 1 in the radial direction~ A distance between the radiation element 1 and the reflector 9 is A/4. Therefore, the radiated electromagnetic wave proceeds by A/4, and xeaches the reflector 9 while the phase angle thereof lags by 90~.
Furthermore, a voltage of which phase lags by 90~, is induced at the reflector 9 by the arriving electromagnetic wave. The phase of a current induced by the voltage further lags by 90~. Accordingly, the electromagnetic wave, the phase of which lags by 270~
~ .
_ 7 _ 2~
compared with that radiated from the radiation element 1, is radiated from the reflector 9. Since the phases of the electromagnetic waves in a range between of the radlation element 1 and the reflector 9 are mutually reversed, they cancel each other. The elect~omagnetic wave which is reflected by the reflector, is added to that radiated from the radiation element both in the same phase with respect to the right hand side direction of the radiation element. Furthermore, the director 10 is provided with a length having a capacitative reactance (for instance, not more than A/2). Therefore, a voltage of which phase angle lags by 180~ is induced in the director 10 as above, by the electromagnetic wave radiated from the radiation element 1. Since the director 10 is capacitative, the phase of the flowing current advances by 90~ (A/4-)~ Accordingly, since the electromagneti~ wave radiated from the director 10 shares ~:
the same phase with the electromagnetic wave radiated from the radiation element 1, the electromagnetic wave is strengthened in the right hand side direction. As stated above, when the single reflector 9 and the single director 10 are arranged respectively at the right hand side and the left hand side of the radiation element 1, the electromagnetic wave i9 provided with a single lobe characteristic as shown in Figure 4. When the number of the directors 10 is increased, a sharper directivity can be provided. As shown in Figure 5, when the directors 10 ":
, ~;
"
" :
"
:
2 ~
are arranged on the left hand side and the right hand side of the radiation element 1, and the reflectors 9 are arranged on the top side and on the bottom side thereof the figure-8 type characteristic can be obtained~ As S shown in Figure 6, when the directors 10 are arranged on the top side, on the bottom side, on the left hand side, and on the right hand side of the radiation element and the reflectors 9 are arran~ed between the respective directors, a petal-like characteristic can be obtained.
A mobile radio base station mounted with the antenna of this kind, is used in a cellular system of which service area is provided with a size of 100 to 200 m. As shown in Figure 7, a base station 34 is often installed at a telegraph poles 35 or at an edge portion of a building the height of which is about 3 to 5 m above the ground. Therefore, the electromagnetic wave is apt to be shielded by a building 36 or the like. The arriving direction of the electromagnetic wave is more or less limited by the positional environment. Therefore, when the mobile radio base station is provided with a directivity in accordance with the place thereof, a directivity gain based on the directivity enlarges the service area.
In the antenna for a radio base station according to the first aspect of the present invention, various directivities can be achieved by a combination of the non-power-feeding reflectors 9 and the directors 10 in ~ .
3 ~
g accordance with the installation place of the radio base stationr by attaching the ends of the stick-like non-power-feeding reflectors 9 or the directors 10 at selected ones of the attaching portions 2 as shown in Figure 1 and the enlarging of the service area in a fixed area of the cellular system can be achieved. Compared with the conventional example, the antenna of this invention can be achieved, for instance, by a single antenna having omni-directionality with respect to a horizontal plane, as the radiation element 1 and a single power-feeding circuit. Furthermore, the installation of the phase shifters 6a to 6c, the phase controlling circuit 8 or the like is not necessary, thereby achieving the downsizing, the cost reduction and the low consumption of power of the equipments.
Figures 8 and 9 show another embodiment of an antenna for a radio base station according to the present invention. In Figures 8 and 9, a reference numeral 24 designates a sleeve antenna haviny a skirt 24s. A
numeral 21 designates a radiation element which is integrated with an electronic circuit 26. Numerals 22a and 22b designate directors and 23a and 23b, non-power feeding reflectors. A numeral 27 designates an interface with a telephone network. A numeral 25 deslgnates an inner conductive body of the sleeve antenna, which achieves the weather resistance and the integration of the antenna and the circuit by incorporating the , " ' '' ~8~,93~
electronic circuit 26. Around the radiation element 21 of the sleeve antenna 24, tapped holes 28 are formed as attaching portions. As in the embodiment of Figure 1, the non-power-feeding reflectors 23a and 23b and the directors 22a and 22b are provided with male screws 29 as fixing portions to be screwed in the tapped holes 28.
Since the operation of this embodiment i5 the same with that in the embodiment of Figure 1, explanation thereof will be omitted. By arranging the non-power-feeding reflectors 23a and 23b and the directors 22a and22b as in Figure 8, the figure-8 type characteristic shown in Figure 5, is provided. Furthermore, when the tapped holes 28 as attaching portions are arranged on a circle as in Figure 6, the petal-like characteristic shown in Figure 6 ca~ be obtained.
An effect can be obtained in the above construction which is the same as that in the embodiment of Figure 1.
Furthermore, as shown in Figure 10, the tapped hole can be substituted by a through hole 30. Retaining pieces 31a and 31b having hooks 32a and 32b provided at ends of the non-power-feeding reflector 9 and the director 10 may be inserted into the through hole 30, in a single motion.
In the antenna for a radio base station of the first aspect oE the present invention, since a desired directivity can be obtained by attaching the stick like non-power-feeding reflectors or directors to selected ., .
.... .
;
2a~93~
attaching portions, this antenna can be constructed by a single radiation element and a single power-feeding circuit. It is not necessary to provide the phase shifter, the phase controlling circuit and the likeO The invention can achieve the downsizin~, the cost reduction and the low consumption of power of equipments, and capable of providing various directivities in accordance with the installation place of the radio base station and enlarging the service area of the mobile radio base station of a small cellular system, or the like.
In the antenna for a radio base station of the second aspect of the present invention, since the attaching portions are formed in the sleeve antenna, various directivities can be provided also ~y the sleeve antenna, and the service area of the mobile radio base station in a small cellular system, or-the like can be enlarged.
; , ~,
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An antenna for a radio base station comprising:
a base plate having a limited length;
attaching portions provided in the base plate and arranged in a longitudinal direction and a transverse direction of the base plate at intervals of approximately a quarter of a wavelength of an electromagnetic wave, wherein the attaching portions are formed in a sleeve antenna;
radiation elements provided at first selected ones of the attaching portions; and stick-like non-power-feeding reflectors or directors attached to second selected ones of the attaching portions surrounding the radiation elements, thereby providing a desired directivity thereof.
a base plate having a limited length;
attaching portions provided in the base plate and arranged in a longitudinal direction and a transverse direction of the base plate at intervals of approximately a quarter of a wavelength of an electromagnetic wave, wherein the attaching portions are formed in a sleeve antenna;
radiation elements provided at first selected ones of the attaching portions; and stick-like non-power-feeding reflectors or directors attached to second selected ones of the attaching portions surrounding the radiation elements, thereby providing a desired directivity thereof.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3350329A JP2605197B2 (en) | 1991-12-09 | 1991-12-09 | Wireless base station antenna |
| JP350329/1991 | 1991-12-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2080934A1 CA2080934A1 (en) | 1993-06-10 |
| CA2080934C true CA2080934C (en) | 1997-09-30 |
Family
ID=18409748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002080934A Expired - Fee Related CA2080934C (en) | 1991-12-09 | 1992-10-20 | Antenna for a radio base station |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2605197B2 (en) |
| CA (1) | CA2080934C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0601576B1 (en) * | 1992-12-09 | 1999-09-01 | Matsushita Electric Industrial Co., Ltd. | Antenna system for mobile communication |
| JP4563616B2 (en) * | 2001-06-04 | 2010-10-13 | マスプロ電工株式会社 | Antenna device |
| JP4405514B2 (en) * | 2003-09-15 | 2010-01-27 | エルジー テレコム， リミテッド | Beam switching antenna system for mobile communication terminal and control method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5515376Y2 (en) * | 1973-03-08 | 1980-04-09 | ||
| JPS60218907A (en) * | 1984-04-13 | 1985-11-01 | Ueda Nippon Musen Kk | Correction method of directional pattern of horizontal plane radiation electric field of antenna |
| CA1239223A (en) * | 1984-07-02 | 1988-07-12 | Robert Milne | Adaptive array antenna |
| JPH0411374Y2 (en) * | 1985-02-27 | 1992-03-23 |
-
1991
- 1991-12-09 JP JP3350329A patent/JP2605197B2/en not_active Expired - Lifetime
-
1992
- 1992-10-20 CA CA002080934A patent/CA2080934C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2605197B2 (en) | 1997-04-30 |
| JPH05160629A (en) | 1993-06-25 |
| CA2080934A1 (en) | 1993-06-10 |
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