JPS6216003Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a duplexer that improves the demultiplexing characteristics by effectively utilizing the differences in the characteristics of two types of band-pass waveformers using different coupling methods.

A conventional duplexer is composed of a combination of bandpass duplexers that use the same coupling method. In other words, conventional duplexers are configured by a combination of band-pass waveformers in which the coupling between the input and output parts and the coupling between the resonant elements are all magnetic field coupling by a loop, or the coupling between the input and output parts and the coupling between the resonant elements is All of these configurations were composed of a combination of open-ended coupling wires or band-pass waveforms for electric field coupling using capacitive plates or the like. In these duplexers, in order to obtain a large amount of attenuation in the frequency range to be demultiplexed, the number of stages of the duplexer is increased or a notch filter is added to secure the necessary amount of attenuation. However, in such a connection configuration, the insertion loss in the passband increases accordingly, making the entire duplexer large and inconvenient to handle, and leading to higher costs due to increased material and processing costs. Ta.

This idea was created in view of the above circumstances, and its purpose is to reduce the amount of attenuation in the frequency domain to be demultiplexed, increase the insertion loss in the passband, and further increase the overall configuration of the demultiplexer. The object of the present invention is to provide a duplexer with high demultiplexing efficiency that can be increased without causing problems.

An embodiment of this invention will be described below with reference to the drawings. First, before explaining a specific configuration example, an outline of this invention will be explained. This device combines a bandpass waver in which the coupling between the input and output parts and the coupling between the resonant elements is all based on electric field coupling, and a bandpass waver in which the coupling between the input and output parts and the coupling between the resonant elements is all based on magnetic field coupling. to configure a duplexer. In other words, as shown in FIG. 1a, the band-pass waver using electric field coupling has a steeper attenuation characteristic (excellent rise characteristic) on the lower side of the passing frequency, that is, on the low-frequency side. As shown in Figure b, a bandpass waveform using electric field coupling has an attenuation characteristic on the high pass frequency side, that is, on the high frequency side.
This method focuses on the steepness of the waveform, and effectively utilizes the characteristics of each waveform to achieve frequencies ₁ , 2, and 3.
₂ ( ₁ < ₂ ), by using a bandpass waver using electric field coupling _{for 2} and a bandpass waver using magnetic field coupling for ₁ , it is possible to obtain good demultiplexing characteristics with a higher degree of separation. A duplexer can be realized.

Next, a specific embodiment of this invention will be described with reference to FIGS. 2 and 3. Figure 2 shows the configuration of a duplexer in one embodiment.
Reference numerals A and 20B designate bandpass wavers having different coupling methods, and reference numeral 21 represents a two-way divider that distributes the signal supplied to the input terminal 22 to each of the bandpass waveformers 20A and 20B. 1 to 9 are each component of the bandpass waver 20A, and 1 is 1/1 of frequency ₂ .
A resonant element in the shape of a round bar with a length of four wavelengths, 2 a case which is the outer conductor of the wave generator 20A, 3 a partition plate between each resonator, 4 a coupling window provided in this partition plate 3, 5 is the coupling plate (or coupling line) of the input/output section, 6,
7 is a coupling plate (or coupling line) between the resonators, 8 is an input connector, and 9 is an output connector. As is clear from this configuration, the bandpass waver 20A has an input section,
The output section and the coupling between each resonator are all provided by coupling plates (or coupling wires) 5 to 7, which are provided at a position of each resonator where the electric field is strong, and are all electrically coupled. As described above, the bandpass waveform generator 20A using such electric field coupling has excellent bandpass attenuation characteristics on the low frequency side. That is, as shown in FIG. 1a, the rise characteristics on the low frequency side are excellent. Also, in Figure 2, 11
to 19 are each component of the upper orbit bandpass transducer 20B, and 11 is 1/1 of frequency ₁ ( ₁ < ₂ ).
A resonant element in the shape of a round bar with a length of four wavelengths, 12 a case which is the outer conductor of the wave transmitter 20B, 13 a partition plate between each resonator, 14 a coupling window provided in this partition plate 13, 15 16 is a coupling loop between the resonators, 18 is an input connector, and 19 is an output connector. As is clear from this configuration, in the band-pass waveform generator 20B, the input section, the output section, and the coupling between each resonator are all due to the coupling loops 15 and 16, and these coupling loops are located at the positions where the magnetic field of each resonator is strong. They are all magnetically coupled. As described above, the band-pass wave generator 20B using such magnetic field coupling has excellent band-pass attenuation characteristics on the high frequency side. That is, as shown in FIG. 1b, the rising characteristics on the high frequency side are excellent. Therefore, the bandpass wave generator 2 by electric field coupling
When 0A is used for frequency ₂ and the bandpass waver 20B by magnetic field coupling is used for frequency ₁ , and these are combined with the 2-way divider 21 to configure a duplexer for frequencies ₁ and ₂ , the pass characteristics from the input end 22 are as follows. Third
The characteristic will be as shown by the dotted line in the figure. In other words, the attenuation characteristics of the _first side of the bandpass waveform generator 20A for frequency ₂ and _{the second} side of the bandpass waveform generator 20B for frequency ₁ are both steep, and a large amount of attenuation can be obtained, so that the degree of separation between frequencies ₁ and ₂ is This is significantly improved compared to characteristic A of the conventional configuration shown by the solid line in FIG. 3 above.

In the above embodiment, the coupling between each resonator and the input/output section is all electric field coupling or magnetic field coupling, but even if the coupling method between each resonator and the coupling method between the input/output section are different, the The effect can be obtained.
For example, there is a bandpass waver in which the coupling between each resonator is electric field coupling and the coupling in the input/output part is magnetic field coupling, and the other is a band pass waver in which the coupling between each resonator is magnetic field coupling and the coupling in the input/output part is electric field coupling. A certain degree of effect can also be obtained by combining it with a passing wave device. Further, although the above embodiment uses a coaxial element, the shape of the element is not limited to this, and may be of any type, such as a helical type, a stripline type, or a dielectric type. Moreover, the duplexer in the above embodiment can also be used as a mixer.

As detailed above, according to this invention, the coupling between the input/output section and each resonator is entirely based on electric field coupling, and the coupling between the input/output section and each resonator is entirely based on magnetic field coupling. By configuring a duplexer by combining it with a pass waver, there is no need to increase the number of stages as in conventional duplexers.
Furthermore, the degree of separation can be easily improved without adding a notch filter or the like. In other words, it is possible to improve the characteristics of the duplexer without increasing insertion loss or increasing the overall configuration of the duplexer, and therefore it is possible to realize a duplexer that is economically advantageous and easy to handle. .

[Brief explanation of the drawing]

Figure 1a is a diagram showing the characteristics of a bandpass waver using electric field coupling, Figure 1b is a diagram showing the characteristics of a bandpass waver using magnetic field coupling, and Figure 2 is a diagram showing the configuration of an embodiment of this invention. FIG. 3 is a diagram showing the characteristics of the duplexer in the above embodiment in comparison with the characteristics of a duplexer with a conventional configuration. 1, 11... Resonant element, 2, 12... Case,
3, 13... Partition plate, 5, 6, 7... Connection plate (or connection line), 8, 18... Input connector, 9, 19...
...output connector, 20A, 20B...bandpass filter, 21...2 divider, 22...input end.

Claims (1)

[Scope of utility model registration request] A duplexer characterized in that it is constructed by combining a band-pass waveformer in which all resonators are electrically coupled and a band-pass waveform in which all resonators are magnetically coupled.