JPS6216564B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a duplexer composed of a combination of a low-pass type notch filter, a high-pass type notch filter, and a bandpass waver.

Conventional duplexers of this type employ a configuration in which a low-pass type notch filter, a high-pass type notch filter, and each bandpass waveform are each constructed separately (or with some exceptions), and a cable is connected between them. Ta. FIG. 1 is a block diagram showing the configuration of a conventional duplexer in this case. In the figure, 1 is an input terminal into which the demultiplexed signal is input, 2 and 3 are output terminals that output the demultiplexed signals, 4 is a high-pass type notch filter, 5 is a low-pass type notch filter, and 6 is tuned to frequency ₂ . 7 is a normal interdigital type bandpass waver, which also has a frequency _{of 1} (
₁ < ₂ ).
8 converts the input signal of input terminal 1 into bandpass waveforms 6 and 7.
T-branch type distributor for distributing and supplying
. . . is a connection cable that connects each of the above-mentioned components (1 to 8).

Here, the characteristics of the high-pass type notch filter 4 are as shown in FIG. 2a, and the characteristics of the low-pass type notch filter 5 are as shown in FIG. 2b.
However, the characteristics of this duplexer, as shown by the solid line A in FIG. 3, have points where the attenuation is maximum at frequencies ₁ and ₂ , that is, attenuation poles P ₁ and P ₂ . This means that the degree of separation between the signals of frequencies ₁ and ₂ is improved. In other words, these notch filters 4 and 5 are used to increase the degree of separation of the duplexer. Conventionally, there are devices in which some of the components shown in FIG. 1 are integrated. A duplexer with an integrated overall configuration does not have many technical problems. However, conventional duplexers of this type always include connection cables, which cause a large insertion loss, which has been a problem, especially in high frequency bands. In addition, since a duplexer is constructed by connecting several duplexers with cables, adjustment is difficult, and the overall configuration becomes large and heavy.
There are many accidents caused by poor contact at cable connections, etc.
Therefore, various inconveniences have occurred, such as inconvenience in handling, high cost, and lack of reliability.

The present invention has been made in view of the above-mentioned circumstances, and is compact in that it integrates low-pass type, high-pass type notch filters, and bandpass waveformers, and configures the coupling methods of the demultiplexed output sections to be different from each other. The present invention aims to provide a duplexer that is lightweight, has excellent performance, and has an economically advantageous configuration.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a cross-sectional view showing the configuration of a turnout in one embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line X-X' in FIG. In the figure, 30 and 3
Reference numerals 2 and 33 respectively designate interdigital band-pass resonator sections each having a three-stage configuration, and reference numerals 31 and 33 each indicate an additional resonator section having a one-stage configuration. １１…………
is a resonant element of the bandpass wave generator section 30, which is shaped like a round bar and has a length of 1/4 wavelength of frequency ₂ . 12... is a resonant element of the bandpass wave generator section 32, which has a round bar shape and has a frequency
It is constructed with a length of 1/4 wavelength of ₁ ( ₁ < ₂ ). Reference numeral 13 designates a resonant element of the additional resonator section 31 serving as a high-pass type notch filter, which is shaped like a round bar and has a length of 1/4 wavelength of frequency ₁ . Reference numeral 14 designates a resonant element of the additional resonator section 33 serving as a low-pass type notch filter, which is shaped like a round bar and has a length of 1/4 wavelength of frequency ₂ . Reference numeral 15 indicates a partition plate between the band-pass wave generator section 30 and the additional resonator section 31, 16 indicates a partition plate between the band-pass wave generator sections 30 and 32, and 17 indicates a partition plate between the band-pass wave generator section 32 and the additional resonator section 33. Partition plate between 1
8 is a case of a duplexer which becomes the outer conductor of the waveform. 19a and 19b are coupling loops, and the coupling loop 19a connects the output connector 24 and the bandpass wave generator section 3.
2, and the coupling loop 19b couples the bandpass wave generator section 32 and the additional resonator section 33. 20a,
20b is also a coupling loop, and the input connector 23
and bandpass waveform units 30 and 32. 21
a and 21b are coupling wires (or coupling plates), and the coupling wire 21a connects the output connector 22 and the bandpass wave generator section 3.
0, the coupling line 21b couples the bandpass wave generator section 30 and the additional resonator section 31, respectively. 25, 26,
27 is the center conductor of each input/output connector 22, 23, 24. However, in FIGS. 4 and 5, three resonant elements 11, ......, partition plate 1
5, 16, and part of case 18, the frequency
_Similarly , three resonant elements 1
2,……, partition plates 16, 17, and case 1
8 constitutes a three-stage interdigital bandpass waveform unit 32 for frequency ₁ . Further, the resonant element 13, the partition plate 15, and a part of the case 18 constitute an additional resonator section 31 which becomes a high-pass type notch filter for frequency ₁ , and the resonator element 14, the partition plate 17, and a part of the case 18 constitute an additional resonator section 31 which becomes a high-pass type notch filter for frequency 1. Additional resonator section 3 serving as a low-pass notch filter for frequency ₂
3. The input connector 23 is provided so that the center conductor 26 is located in the coupling notch of the partition plate 16, and between the center conductor 26 and the case 18, as shown in the figure, there are band-pass transducer sections 30, 32.
A coupling loop 20a, 20b is provided between the two. The output connector 22 is provided so that the center conductor 25 is located in the coupling notch of the partition plate 15, and the coupling line between the bandpass wave generator section 30 and the additional resonator section 31 is connected to the center conductor 25. 21a and 21b are provided. The output connector 24 is provided so that the center conductor 27 is located in the coupling notch of the partition plate 17, and between the center conductor 27 and the case 18, the band-pass wave generator 32 and the additional resonator are connected. Coupling loops 19a and 19b with the vessel portion 33 are provided.

Here, the coupling between the bandpass wave generator section 30, the additional resonator section 31, and the output plug 22 is made by coupling lines 21a, 2
1b, and these bonding lines 21a, 21
b has one end connected to the center conductor 25 of the output plug 22 and the other end open, and is located in the open part of the resonant elements 11 and 13, that is, in a place where the electric field is strong.
It forms an electric field coupling. However, the characteristics of the wave transmitter in which the additional resonator section ₃₁ is coupled to the band-pass wave transmitter section 30 by electric field coupling are as follows:
Since it is more steep (that is, the rise characteristics are excellent), it exhibits the characteristics shown in FIG. 6a.

Next, the bandpass wave generator section 32 and the additional resonator section 3
3 and the output connector 24 are connected by the coupling loops 19a and 19b connecting the center conductor 27 of the output connector 24 and the case 18, as described above, and the resonant element 1
2 and 14 are fixed to the case 18, that is, located at a location where the magnetic field is strong, and are magnetically coupled. However, the characteristic of the wave transmitter in which the additional resonator section 33 is coupled to the band-pass wave transmitter section 32 by magnetic field coupling is that the rise on the high side (high frequency side) of frequency ₁ is steeper in the attenuation characteristic. (In other words, the rise characteristic is excellent), and therefore exhibits the characteristics shown in FIG. 6b.

Therefore, two bandpass waveform sections 30 and 32 having mutually contradictory characteristics as shown in FIG. 6a and b are used.
The characteristics of the duplexer combining the above are as shown by the dotted line curve B in FIG. In other words, the insertion loss caused by connection cables, etc., which was a problem in the past, is eliminated.
The rise of the attenuation curve also becomes steeper,
The separation characteristics are improved.

In the above embodiment, a duplexer is explained in which a one-stage low-pass or high-pass notch filter is added to a three-stage interdigital bandpass waver, but the number of stages of each waver is It is not limited to this, and other number of stages may be used. Furthermore, in the above embodiment, an interdigital type coupling circuit using coaxial elements and a coupling circuit in which the input circuit is branched into two has been explained as an example, but the circuit type is not limited to the interdigital type. The circuit system may also be used. Moreover, the resonant element 1
The shapes of 1 to 14 are not limited to the coaxial type, and can be applied to any of the stripline type, helical type, dielectric type, etc. In addition, the coupling circuit is not limited to a coupled line branched into two, and as long as the coupling with the resonant element to obtain the attenuation pole is electric field coupling on one side and magnetic field coupling on the other, other coupling circuits may be used. It may be a method. Moreover, the duplexer in the above embodiment can also be used as a mixer.

As detailed above, according to the duplexer of the present invention,
A low-pass type notch filter, a high-pass type notch filter, and a bandpass waver are all integrated, and one side of the output part is coupled with an electric field and the other with a magnetic field, thereby eliminating losses caused by connection cables, etc., and eliminating the frequency to be demultiplexed. can increase the degree of separation. Furthermore, the entire duplexer can be made smaller and lighter, reducing costs, and making handling and adjustment easier.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of a conventional duplexer, Figures 2a and b are diagrams showing the characteristics of high-pass type and low-pass type notch filters, and Figure 3 is the characteristic of a duplexer in the conventional configuration. FIG. 4 is a cross-sectional view showing an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line X-X' in FIG. 4 above. The arrow view and FIGS. 6a and 6b are diagrams showing partial characteristics of the duplexer in the above embodiment, respectively. 11,…………,12,…………,13,14
... Resonance element, 15, 16, 17 ... Partition plate, 1
8...Case, 19a, 19b, 20a, 20b
...Coupling loop, 21a, 21b...Coupling wire (coupling plate), 22, 24...Output connector, 23...Input connector, 25, 26, 27...Center conductor, 30,3
2...Bandpass resonator section, 31, 33...Additional resonator section.

Claims (1)

[Claims] 1. A duplexer characterized in that a low-pass type notch filter, a high-pass type notch filter, and a bandpass waver are integrally constructed, and one side of the demultiplexing output section is electric field coupled and the other side is magnetic field coupled.