JPH0247605Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to an antenna duplexer for sharing transmitting signals and receiving signals having different frequencies with one antenna.

b. Prior Art An antenna duplexer for transmitting and receiving two frequencies at the same time from a mobile object such as a car by sharing one antenna is small, low cost, vibration resistant and
There is a demand for materials with excellent impact resistance. Generally, as this type of antenna duplexer, one that combines a band-pass type resonator or one that combines a polarized band-elimination type resonator has been proposed, but if the transmitting frequency and receiving frequency are close to each other, It is advantageous to use a band-elimination type duplexer in order to obtain the same electrical characteristics and to achieve miniaturization in both cases.

FIG. 1 shows the configuration of a conventional band elimination type duplexer, and this duplexer is composed of a filter A and a coupled line section B. In FIG. Filter part A
are notch-shaped high-pass filters 1a, 1b, 1c and a low-pass filter 2 arranged in a horizontal row.
a, 2b, 2c, and the coupled line section B is composed of filter output terminals 3a, 3b, 3c, 3d, 3e, 3
f, four branch connection terminals 4a, 4b, 4c, 4d,
4e, 4f and coupled lines 5a, 5b, 5c, 5d
and distributed reactance lines 6a and 6 for high and low frequencies.
b, 6c, 6d, 6e, 6f, output combining coaxial lines 7a, 7b, and an antenna terminal 8.

c. Problems to be solved by the invention As mentioned above, the conventional duplexer includes the coupling lines 5a to 5d between the four-branch connection terminals, the distributed reactance lines 6a to 6f for high and low frequencies, and the output combining line 7a,
7b etc., when the transmission power is large, a coaxial cable having connection terminals at both ends is usually used. In this case, since there are many connection terminals and therefore many connection points, there are disadvantages of poor workability and poor reliability.

Also, since it is necessary to adjust the line length,
When manufacturing a shared device, material costs, processing costs,
There was a problem that the production cost and therefore the product cost increased.

Moreover, the coupled lines 5a~ made of coaxial cables
5d and the output combining lines 7a and 7b require a large amount of accommodation space, resulting in a problem that the duplexer becomes large.

The present invention was developed by focusing on the various problems mentioned above, and the coupling line between each filter element, the distributed reactance line for high and low frequencies, and the output combining line are installed in the groove of the line storage part. By arranging the line storage and using the line storage part as the outer conductor, it is possible to reduce the number of parts and connection points, and it is extremely easy to manufacture, has high circuit reliability, is small, and is low cost. By arranging high-pass filters and low-pass filters every other stage, the distance between the high-pass filters and the distance between the low-pass filters can be made longer, and the electrical connection length between the filters in the low frequency band can be increased. To provide an antenna duplexer having the advantage of being able to accommodate a line of sufficient length even in long lines.

d. Means for Solving the Problems In order to solve the various problems mentioned above, the present invention uses an antenna duplexer constructed by combining a notch-shaped high-pass filter and a low-pass filter. , a line storage part is connected to a filter part in which the high-pass filter and the low-pass filter are arranged alternately at every other stage, and a grid-shaped groove is formed in the line storage part, and the conducting wire is insulated. The coupling line between each filter element consists of
A low-frequency distributed reactance line and an output synthesis line are housed in the groove as inner conductors, respectively, and the line housing portion is used as an outer conductor for each line.

e Example The following is an example of the present invention shown in Figures 2 and 3.
This will be explained with reference to the figures.

2 and 3, reference numeral 11 denotes a six-stage filter section, and this filter section 11 includes notch-shaped high-pass filters 12a, 1
2b, 12c and notch-shaped low-pass filters 13a, 13b, 13c are arranged in alignment with each other at every other stage.

Reference numeral 14 denotes a plate-shaped line storage section integrally connected to the filter section 11, and high-pass filters 12a to 12a are provided on the surface side of the line storage section 14.
12c coupled lines 15a, 15b, output composite line 16 and high frequency distributed reactance lines 17a, 1
7b and 17c are housed, and low-pass filters 13a to 13 are also arranged on the back side (not shown).
A coupled line, an output combination line, and a low-frequency distributed reactance line are housed.

That is, the high pass filters 12a to 12c
The coupling loops 18a, 18b, 18c of the insulator 1
9a, 19b, 19c, respectively, to the surface side of the line storage section 14, while the coupling loops 18d, 1 of the low-pass filters 13a to 13c are
8e and 18f are drawn out to the back side of the line storage portion 14 via insulators 19d, 19e, and 19f, respectively. On the other hand, the line storage portion 14 is provided with grooves 20 of an appropriate shape on its front and back surfaces, and a coupled line 15 made of an insulating coated copper wire 30.
a, 15b, the output synthesis line 16 and the distributed reactance lines 17a to 17c for high and low frequencies are connected to the groove 2.
It is housed inside 0. In addition, the track storage section 1
4, input terminals 23, 27 and an antenna output terminal 26 are provided in a protruding manner.

As clearly shown in FIG. 3, on the surface side of the line storage section 14, the output point 22a of the coupling loop 18a is housed in the coupling line section 15a, the high-frequency distributed reactance line 17a, and the groove 20. The other end of the line 24 is connected to the input terminal 23.
Further, the output point 22b of the coupling loop 18b is connected to the coupling lines 15a, 15b and the high frequency distributed reactance line 17b, respectively, and the coupling loop 18
The output point 22c of c is connected to the coupling line 15b, the high-frequency distributed reactance line 17c, and the output combining line 16, respectively. Further, the output composite line 16 is inserted into a through hole 31 provided approximately at the center of the line storage portion 14, and is connected to the antenna output terminal 26 together with the output composite line 16 from the back side. On the other hand, on the back side of the line storage section 14, as on the front side, a coupled line, a low-frequency distributed reactance line, and an output synthesis line are housed in the grooves and connected.

As shown in FIG. 3, lids 28a and 28b are fastened to the front and back sides of the track storage section 14 with mounting screws 29.

According to this embodiment, the coupled lines 15a, 15b,
Distributed reactance lines 17a to 17 for high and low frequencies
c and the output composite line 16 are housed in a housing made up of the groove 20 of the line storage part 14 and the lids 28a and 28b, so this housing is used as the outer conductor of these lines. be able to. A coaxial cable is composed of an inner conductor such as a copper wire, an insulator that covers the inner conductor, and an outer conductor that surrounds the insulator. By doing so, only the insulated copper wire 30 can be used equivalently to a coaxial cable, and connection terminals at connection points are not required.

Therefore, the structure becomes simple and the connection line can be easily attached. In addition, distributed reactance lines 17a to 17c for high and low frequencies and coupled lines 15
a, 15b becomes easy to adjust, and costs such as material costs, processing costs, assembly costs, and parts costs can be reduced. In addition, since no connection terminals are used, there are fewer connection points, which improves the overall reliability of the antenna duplexer and enables stable operation.
Adjustment time can be shortened. Furthermore, since each line is accommodated on the front side and the back side of the line storage section 14, it is possible to downsize the shared device.

Further, FIG. 4 shows a modification of the track storage portion 14, and in this example, the grooves 20 are arranged in a checkerboard pattern. With this configuration, the coupled lines 15a, 15b, the output composite line 16, and the distributed reactance lines 17a to 17c for high and low frequencies.
By appropriately changing the arrangement within the groove 20,
The length of these lines can be changed arbitrarily, and the time for adjusting the line length can be shortened.

In addition, in the above embodiment, an antenna duplexer using three stages of high-pass filters 12a to 12c and three stages of low-pass filters 13a to 13c was described, but the number of stages of each filter is limited to this. However, other number of stages may be used. In addition, in the embodiments described above, the case where a semi-coaxial type filter was used was explained as an example.
The resonant element is not limited to a semi-coaxial type, but any type such as a stripline type, helical type, dielectric type, etc. can be applied.

f. Effects of the invention As described above, in the present invention, each line is housed in a grid-shaped groove formed in a line storage part, and this line storage part is used as an outer conductor for each line. Therefore, it can be used equivalently to a coaxial cable simply by using an inner conductor such as an insulated copper wire. Therefore, the connection terminals required at both ends of the coaxial cable can be omitted, reducing the number of parts and connection points, improving circuit reliability, and making the antenna duplexer easy to manufacture, compact, and inexpensive. can be provided.

Further, according to the antenna duplexer according to the present invention, the outer wall of the groove formed in the line storage portion is used as the outer conductor of the coaxial line, and the groove is configured in a checkerboard pattern, so that the conductor coated with insulation By appropriately selecting a wiring route (for example, a copper wire) from among the grooves extending in a grid pattern, the line length can be arbitrarily set with an extremely easy operation. Furthermore, since high-pass filters and low-pass filters are arranged every other stage, the distance between high-pass filters and low-pass filters becomes longer, and the distance between filters in low frequency bands becomes longer. Even lines with long electrical connection lengths can accommodate lines of sufficient length.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing the configuration of a conventional antenna duplexer, Figs. 2 and 3 show an embodiment of the present invention, and Fig. 2 is a schematic plan view of the antenna duplexer; FIG. 3 is an exploded perspective view of the same as the above, and FIG. 4 is a plan view of essential parts showing a modification of the groove of the track storage section. 11... Filter section, 12a, 12b, 12
c...High pass filter, 13a, 13b, 1
3c...Low pass filter, 14...Line storage section as outer conductor of coaxial cable, 15a, 15
b... Combined line section, 16... Output composite line, 17
a, 17b, 17c...distributed reactance line for high frequency, 18a, 18b, 18c...coupling loop,
20... Groove, 28a, 28b... Lid body, 30...
Copper wire as the inner conductor of a coaxial cable.

Claims (1)

[Claims for Utility Model Registration] 1. In an antenna duplexer constructed by combining a notch-shaped high-pass filter and a low-pass filter, the high-pass filter and the low-pass filter are arranged alternately at every other stage. A line storage section is connected to the filter section arranged in the filter section, and a checkerboard-shaped groove is formed in the line storage section, and a coupled line between each filter element consisting of an insulated conductive wire, and a distribution for high and low frequencies. An antenna duplexer characterized in that a reactance line and an output combination line are housed in the groove as inner conductors, and the line housing is used as an outer conductor of each line. 2. Claims for registration of a utility model characterized in that the coupled line of the high-pass filter is arranged on the surface of the line storage section, and the coupled line of the low-pass filter is arranged on the back side of the line storage section. The antenna duplexer described in paragraph 1.