JP2004207979A - Multiplexer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiplexer that can be reduced in cost by reducing its size, and has a better electrical characteristics, as compared to conventional ones. <P>SOLUTION: By using k(k≥2) circulators, and distributing into k the output of a first group of m(m≥2) band-pass filters which pass transmission waves of an odd or even numbered channels, they are inputted to the first terminals of the k circulators. Along with it, the output of a second group of n(n≥2) band-pass filters for passing transmission waves of an even or odd numbered channels are distributed into k, and are inputted to the second terminals of the k circulators. Moreover, outputs from the third terminals are combined and outputted. Each circulator outputs power inputted to its first terminal from its second terminal, and along with it outputs power inputted to the second terminal from its third terminal. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００１８】
【数２】

【００１９】
前述の（２）式より、第１のサーキュレータ（ＣＩＲ１）の第２の端子Ｔ_２１３、並びに、第２のサーキュレータ（ＣＩＲ２）の第２の端子Ｔ_２２３には、それぞれ（−ｊＥ_ｉｉ／√２）の電圧が出力され、これらの電圧は、電力合成器（ＴＱ_２３）で合成されて端子Ｔ_２３から出力される。
この端子Ｔ_２３から出力される電圧は、下記（３）で求めることができ、端子Ｔ_２３からは、（−Ｅ_ｉｉ）の電圧が出力される。即ち、図５に示す端子Ｔ_２２に電圧を加えた時に、同じ電圧が、端子Ｔ_２３から出力される。
【００２０】
【数３】

【００２１】
図５に示す端子Ｔ_２１に入力される電圧は、第１の電力分配器（ＴＱ_２１）で２分配され、第１のサーキュレータ（ＣＩＲ１）の第１の端子Ｔ_２１１、並びに、第２のサーキュレータ（ＣＩＲ２）の第１の端子Ｔ_２２１に入力され、それぞれ第１のサーキュレータ（ＣＩＲ１）の第２の端子Ｔ_２１２、並びに、第２のサーキュレータ（ＣＩＲ２）の第２の端子Ｔ_２２２から出力される。
この出力電圧は、第２の電力分配器（ＴＱ_２２）で合成された後、第２群の帯域通過フィルタ（Ｂ２，Ｂ４，…，Ｂｎ−１）で反射され、再度第２の電力分配器（ＴＱ_２２）に入力され、前述と同様にして、端子Ｔ_２３から出力される。
即ち、図５に示す端子Ｔ_２１に電圧を加えた時に、同じ電圧（あるいは、電流）が、端子Ｔ_２３から出力される。
接続ケーブルの長さ、および、Ｑ変成器型の電力分配器（ＴＱ_２１，ＴＱ_２２）と電力合成器（ＴＱ_２３）の特性が同一特性であれば、図５に示すサーキュレータ（ＣＩＲ１，ＣＩＲ２）の並列運転は、１個のサーキュレータと等価になる。
【００２２】
しかしながら、図５に示すサーキュレータ（ＣＩＲ１，ＣＩＲ２）に入力される送信波の電圧（あるいは、電流）は、１／√２にすることができるので、各サーキュレータ（ＣＩＲ１，ＣＩＲ２）を通過する送信波の電力を、１／２にすることができる。
このことは、電力容量が２倍になること意味するので、相互変調波（ＩＭ３）が発生するレベルを、３ｄＢ増加させたことになる。
即ち、図１に示す合波器において、相互変調波（ＩＭ３）が発生する送信波の電力レベルをＰ（Ｗ）とすると、本実施の形態では、相互変調波（ＩＭ３）が発生する送信波の電力レベルを、２×Ｐ（Ｗ）とすることができ、入力される送信波の電力が大きい場合でも、相互変調波（ＩＭ３）の発生を低減することが可能となる。
入力される送信波の電力が、より大電力の場合には、並列運転させるサーキュレータの数を、３，４，…，ｎと成し、それに合わせて、第１の電力分配器（ＴＱ_２１）と第２の電力分配器（ＴＱ_２２）での分配数、および電力合成器（ＴＱ_２３）での合波数を設定すればよい。
【００２３】
本発明の実施の形態において、並列運転させるサーキュレータの数を４とした場合の、サーキュレータ（ＣＲ１〜ＣＲＩ４）、第１の電力分配器（ＴＱ_４１）、第２の電力分配器（ＴＱ_４２）、および電力合成器（ＴＱ_４３）の構成を図６に示す。
図６に示す合波器では、電力容量が４倍になるので、相互変調波（ＩＭ３）が発生するレベルを、６ｄＢ増加させることができる。
また、分配数がｎの場合の、電力分配器（ＴＱ_４１，ＴＱ_４２）、および電力合成器（ＴＱ_４３）の〔Ｓ〕マトリクス（〔Ｓｎ〕）を下記（４）式に示す。
【００２４】
【数４】

【００２５】
以上、本発明者によってなされた発明を、前記実施の形態に基づき具体的に説明したが、本発明は、前記実施の形態に限定されるものではなく、その要旨を逸脱しない範囲において種々変更可能であることは勿論である。
【００２６】
【発明の効果】
本願において開示される発明のうち代表的なものによって得られる効果を簡単に説明すれば、下記の通りである。
本発明によれば、従来の合波器に比して、小型化を図り、コストを低減するとともに、良好な電気的特性が得られる合波器を提供することが可能となる。
【図面の簡単な説明】
【図１】本発明の基本となる合波器の概略構成を示すブロック図である。
【図２】図１に示す第２群の帯域通過フィルタ（Ｂ２，Ｂ４，Ｂ６）の減衰特性と、反射減衰量を示すグラフである。
【図３】図１に示す第１群の帯域通過フィルタ（Ｂ１，Ｂ３，…，Ｂｎ）の減衰特性を示すグラフである。
【図４】図１に示す各入力端子（Ｔ_１〜Ｔ_ｎ）と、図１に示す出力端子（Ｔ_００）との間の伝送特性を示すグラフである。
【図５】本発明の実施の形態の合波器の概略構成を示すブロック図である。
【図６】本発明の実施の形態において、並列運転させるサーキュレータの数を４とした場合の、サーキュレータ、第１の電力分配器、第２の電力分配器、および電力合成器の構成を示すブロック図である。
【図７】従来のＣＩＢ型合波器の概略構成を示すブロック図である。
【図８】従来のスターポイント型合波器の概略構成を示すブロック図である。
【符号の説明】
Ｈ１１，Ｈ１２，Ｈ２１，Ｈ２２，Ｈｎ１，Ｈｎ２…ハイブリッド回路、ＣＩＲ，ＣＲＩ１〜ＣＲＩ４…サーキュレータ、ＴＱ_２１，ＴＱ_２２，ＴＱ_４１，ＴＱ_４２…電力分配器、ＴＱ_２３，ＴＱ_４３…電力合成器、Ｂ１〜Ｂｎ，ＢＦ１１、ＢＦ１２，ＢＦ２１，ＢＦ２２，ＢＦｎ１，ＢＦｎ２…帯域通過フィルタ、Ｒ…無反射終端器。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multiplexer, and more particularly to a multiplexer used for multiplexing transmission power in the field of mobile communication such as terrestrial digital television and WCDMA.
[0002]
[Prior art]
As a conventionally used multiplexer (also referred to as an antenna sharing device), a CIB type multiplexer shown in FIG. 7 is known.
As shown in FIG. 7, in the conventional CIB type multiplexer, the fourth terminal (T ₄ ) and the first terminal (T ₁ ) of each adjacent second hybrid circuit (H12, H22,..., Hn2). ) Are connected to each other, the first terminal (T ₁ ) of one second hybrid circuit (H12) at both ends is connected to the non-reflection terminator (R), and the other second hybrid circuit at both ends is connected. A fourth terminal (T ₄ ) of the circuit (Hn2) serves as an output terminal and is connected to, for example, an antenna (not shown).
Further, each of the second hybrid circuit (H12, H22, ..., Hn2 ) and a second terminal of the _{(T 2),} the first hybrid circuit (H11, H21, ..., Hn1 ) a second terminal of the _(T 2) , BFn1, BF11, BF21,..., BFn1 for passing transmission waves of the respective channels, and third terminals of the second hybrid circuits (H12, H22,..., Hn2). _{(T 3)} and the first hybrid circuit (H11, H21, ..., Hn1 ) between the third terminal of _{(T 3),} band pass filter for passing a transmission wave of each channel, respectively (BF12, BF22 , BFn2) are connected.
Further, a first terminal (T ₁ ) of each first hybrid circuit (H11, H21,..., Hn1) is connected to a transmitter that outputs a transmission wave of each channel, and each first hybrid circuit (H11, H11, H21,. The fourth terminals (T ₄ ) of H21,..., Hn1) are respectively connected to the reflectionless terminators (R).
Here, each of the first and second hybrid circuits and each band-pass filter constitute a constant impedance band-pass filter that allows transmission waves of each channel to pass.
[0003]
Hereinafter, the operation of the CIB type multiplexer shown in FIG. 7 will be briefly described.
The transmission wave of the channel CH1 input from the first terminal (T ₁ ) of the first hybrid circuit (H11) passes through the band-pass filters (BF11, BF12) and is input to the second hybrid circuit (H12). , From the fourth terminal (T ₄ ) of the second hybrid circuit (H12).
The transmission wave of the channel CH1 output from the second hybrid circuit (H12) is input to the second hybrid circuit (H22), and is totally reflected by the band-pass filters (BF21, BF22). H22) is output from the fourth terminal (T ₄ ). Hereinafter, similarly, the signal is output from the fourth terminal (T ₄ ) of the second hybrid circuit (Hn2).
As a conventionally used multiplexer (also referred to as an antenna sharing device), a star point type multiplexer shown in FIG. 8 is known.
As shown in FIG. 8, the conventional star point type multiplexer is configured such that bandpass filters (B1, B2,..., Bn) for transmitting transmission waves of respective channels are connected in parallel to an output terminal To. You.
[0004]
Prior art document information related to the present invention includes the following.
[Patent Document 1]
Japanese Patent Application No. 2001-186833
[Problems to be solved by the invention]
In the CIB type multiplexer shown in FIG. 7 described above, n sets (n × 2) of high-performance band-pass filters (that is, high-selectivity type band-pass filters) and hybrid circuits are required. There is a problem that the size of the whole wave device is increased and the product cost is increased.
On the other hand, the star point type multiplexer shown in FIG. 8 described above requires n band-pass filters, so that the overall size of the multiplexer can be reduced as compared with the CIB type multiplexer shown in FIG. In addition, the product cost can be reduced.
However, when multiplexing signals of adjacent channels, even if a high-performance bandpass filter is used, there is a problem that interference between circuits occurs due to a small guard band, and good electrical characteristics cannot be obtained. is there.
[0006]
The present invention has been made in order to solve the problems of the prior art, and an object of the present invention is to reduce the size, reduce the cost, and improve the cost as compared with the conventional multiplexer. An object of the present invention is to provide a multiplexer capable of obtaining electrical characteristics.
The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.
[0007]
[Means for Solving the Problems]
The following is a brief description of an outline of typical inventions disclosed in the present application.
That is, the present invention includes a circulator that outputs the power input to the first terminal from the second terminal and outputs the power input to the second terminal from the third terminal. A first group of m (m ≧ 2) band-pass filters of a first group for transmitting a transmission wave of an odd or even channel is connected to a first terminal, and a transmission wave of an even or odd channel is connected to the second terminal. Is basically connected to a second group of n (n ≧ 2) band-pass filters that pass through.
In the basic multiplexer, a high-selectivity type band-pass filter is used as the second group of n (n ≧ 2) band-pass filters, so that the first group of m (m ≧ m) 2) As the bandpass filters, a low-selectivity type (passband having a wide bandwidth) band-pass filter can be used.
[0008]
Therefore, according to the basic multiplexer, the first group of m (m ≧ 2) band-pass filters and the second group of n (n ≧ 2) band-pass filters are the same. For example, when m = n, the number of the high-selectivity type band-pass filters having a high cost may be n / 2, so that the size can be reduced as compared with the CIB type multiplexer shown in FIG. It is possible to reduce costs.
Further, each of the m (m ≧ 2) bandpass filters of the first group and the n (n ≧ 2) bandpass filters of the second group is every other odd number or even number. Since the transmission wave of the channel is transmitted, there is no occurrence of inter-circuit interference between adjacent channels unlike the conventional star point type multiplexer, so that good electrical characteristics can be obtained.
[0009]
However, when the input power is large in this basic multiplexer, the combined transmission wave output from the third terminal of the circulator is added to the intermodulation wave (IM3 ) Occurs.
Therefore, in the multiplexer according to the present invention, k (k ≧ 2) circulators are used, and outputs of the m (m ≧ 2) band-pass filters of the first group are distributed to k, and the k Circulators, and outputs k of the second group of n (n ≧ 2) band-pass filters to k, and inputs the resulting signals to the second terminals of the k circulators. Further, the output from the third terminal is synthesized and output.
That is, the multiplexer of the present invention is characterized in that k circulators are operated in parallel.
Generally, the intermodulation wave is proportional to the square of the input power. Therefore, in the above-described basic multiplexer, when the input power is doubled, the intermodulation wave is quadrupled. In this case, by operating two circulators in parallel, even if the input power is doubled, the power input to each circulator becomes (1/2). [0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In all the drawings for describing the embodiments, components having the same function are denoted by the same reference numerals, and repeated description thereof will be omitted.
[Configuration of a multiplexer as a basis of the present invention]
FIG. 1 is a block diagram showing a schematic configuration of a multiplexer which is the basis of the present invention. Incidentally, in FIG. 1, CH1 through CHn indicates the channel number of consecutive television _signals, f 1 ~f _n indicates the center frequency of each bandpass filter.
In the figure, a circulator (CIR) outputs power input to a first terminal (T ₀₁ ) to a second terminal (T ₀₂ ), and outputs power input to a second terminal (T ₀₂ ). Output to the third terminal (T ₀₀ ).
Further, a first group of band-pass filters (B1, B3,..., Bn) connected in a star point manner are connected to the first terminal (T ₀₁ ), and the second terminal (T ₀₂ ) is connected to the first terminal (T ₀₁ ). , A second group of band-pass filters (B2, B4,..., Bn-1) connected in a star point manner.
Each band-pass filter (B1, B3,..., Bn) of the first group of band-pass filters transmits the transmission waves of the odd-numbered channels, so that the band-pass filters between the adjacent channels (for example, the channel CH1 and the channel CH3) ) Does not cause inter-circuit interference.
[0011]
Each of the band-pass filters (B2, B4,..., Bn-1) of the band-pass filters of the second group allows transmission waves of even-numbered channels to pass therethrough, and therefore, is transmitted between adjacent channels (for example, channel CH2 and channel CH4). ) Does not cause inter-circuit interference.
Note that the first group of band-pass filters (B1, B3,..., Bn) allow transmission waves of even-numbered channels to pass, and the second group of band-pass filters (B2, B4,. Alternatively, transmission waves of odd-numbered channels may be passed.
In the multiplexer shown in FIG. 1, the transmission wave of each channel that has passed through the second group of band-pass filters (B2, B4,..., Bn-1) is transmitted to a second terminal (T ₀₂ ) of a circulator (CIR). And output from the third terminal (T ₀₀ ).
The transmission wave of each channel that has passed through the first group of band-pass filters (B1, B3,..., Bn) is input to a first terminal (T ₀₁ ) of a circulator (CIR), and is transmitted to a second terminal (TIR). T ₀₂ ), is reflected by the second group of band-pass filters (B 2, B 4,..., Bn−1), is again input to the second terminal (T ₀₂ ), and is input to the third terminal (T ₀₂ ). ₀₀ ).
[0012]
FIG. 2 is a graph showing the attenuation characteristics and return loss of the second group of band-pass filters (B2, B4, B6) shown in FIG. The solid line in the figure shows the attenuation characteristic, and the two-dot chain line shows the return loss.
As can be seen from the attenuation characteristics in FIG. 2, the band-pass filters (B2, B4, B6) of the second group have attenuation characteristics in which the pass band is narrower than the channel width and the fall is steep, that is, the high selection A degree bandpass filter is used.
In the present embodiment, the channel width is 6 MHz, and the pass band of the band-pass filter is 5.6 MHz.
A bandpass filter having such characteristics can be realized using an HE mode dielectric resonator, a TE _01δ mode dielectric resonator, a rectangular waveguide resonator, or a circular waveguide resonator. , The cost will be higher.
[0013]
FIG. 3 is a graph showing the attenuation characteristics of the first group of bandpass filters (B1, B3,..., Bn) shown in FIG.
As can be seen from the attenuation characteristics of FIG. 3, the bandpass filters (B1, B3,..., Bn) of the first group have attenuation characteristics in which the pass band is wider than the channel width and the fall is gentle, that is, A low selectivity band pass filter is used.
A bandpass filter having such characteristics can be realized using a coaxial resonator or a _TM01δ mode dielectric resonator, and can be manufactured relatively small and inexpensively.
The transmission wave of each channel that has passed through the first group of band-pass filters (B1, B3,..., Bn) is input to a first terminal (T ₀₁ ) of a circulator (CIR), and is transmitted to a second terminal (T _02). ) And reflected by the second group of band-pass filters (B2, B4,..., Bn-1).
At this time, according to the return loss characteristics shown in FIG. 2, the transmission wave of each channel that has passed through the first group of band-pass filters (B1, B3,. It is absorbed by the pass filters (B2, B4,..., Bn-1).
[0014]
For example, the channel CH2 component of the transmission wave of the channel CH1 that has passed through the band-pass filter B1 is absorbed by the band-pass filter B2.
Similarly, the channel CH2 component in the transmission wave of the channel CH3 is absorbed by the band-pass filter B2, and the channel CH4 component in the transmission wave of the channel CH3 is absorbed by the band-pass filter B4.
Therefore, as shown in FIG. 4, the transmission waves of the respective channels output from the third terminal (T ₀₀ ) of the circulator and passing through the first group of band-pass filters (B1, B3,..., Bn) are: The pass band is narrower than the channel width, and has a steep fall attenuation characteristic.
FIG. 4 is a graph showing the transmission characteristics of the multiplexer according to the present embodiment. The input terminals (T _{1 to} T _n ) shown in FIG. 1 and the output terminals (T ₀₀ ) shown in FIG. 6 is a graph showing transmission characteristics during the period of FIG.
In the present embodiment, the first group of band-pass filters (B1, B3,..., Bn) having the attenuation characteristics shown in FIG. 2 may be used.
However, as in the present embodiment, the bandpass filters having high selectivity are used by using the first group of bandpass filters (B1, B3,..., Bn) having the attenuation characteristics shown in FIG. This embodiment is more advantageous in reducing the cost because the number of uses can be halved.
[0015]
[Configuration of the multiplexer according to the embodiment of the present invention]
In the multiplexer shown in FIG. 1 described above, when the input power is large, the combined transmission output from the third terminal (T ₀₀ ) of the circulator (CIR) due to the minute nonlinearity of the circulator (CIR). An intermodulation wave (IM3) is generated in the wave.
In order to solve this problem, the multiplexer according to the present invention is characterized in that a plurality of circulators are operated in parallel.
FIG. 5 is a block diagram showing a schematic configuration of the multiplexer according to the embodiment of the present invention.
Multiplexer of the present embodiment, the first power divider and _{(TQ 21),} a second power divider and _{(TQ 22),} a first circulator (CIR1), a second circulator (CIR2) And a power combiner (TQ ₂₃ ).
The first power distributor (TQ ₂₁ ) branches the output of the first group of band-pass filters (B1, B3,..., Bn) into two, and the second power distributor (TQ ₂₂ ) , The output of the band-pass filter (B2, B4,..., Bn-1) is branched into two.
First circulator (CIR1) is the first terminal _{(T 211),} power divider One output of _{(TQ 21)} is input, the power divider to the second terminal _{(T 212) (TQ 22)} Is output.
[0016]
Second circulator (CIR2) is the first terminal _{(T 221),} power divider other output of _{(TQ 21)} is input, the power divider to the second terminal _{(T 222) (TQ 22)} Is output.
The power combiner (TQ ₂₃ ) transmits the transmission wave output from the third terminal (T ₂₁₃ ) of the first circulator (CIR 1) and the third terminal (T ₂₂₃ ) of the second circulator (CIR 2). The output transmission wave is combined and output.
Here, the first power distributor (TQ ₂₁ ), the second power distributor (TQ ₂₂ ), and the power combiner (TQ ₂₃ ) are composed of, for example, a λ / 4 type Q transformer.
The [S] matrix of the first power distributor (TQ ₂₁ ), the second power distributor (TQ ₂₂ ), and the power combiner (TQ ₂₃ ) is obtained by the following equation (1).
Further, when the input voltage of E _ii is applied to the terminal T ₂₂ shown in FIG. 5, the output voltages (E ₁₁ , T ₁₁ ) output from the terminals (T ₂₁₃ , T ₂₂₃ ) of the second power distributor (TQ ₂₂ ). E ₁₂ ) can be obtained by the following equation (2).
[0017]
(Equation 1)

[0018]
(Equation 2)

[0019]
From the above equation (2), (−jE _ii / √2) is applied to the second terminal T ₂₁₃ of the first circulator (CIR1) and the second terminal T ₂₂₃ of the second circulator (CIR2), respectively. ) Are output, and these voltages are combined by the power combiner (TQ ₂₃ ) and output from the terminal T ₂₃ .
Voltage output from the terminal _{T 23} may be determined by the following (3), from the terminal _{T 23,} - voltage _{(E ii)} is outputted. That is, when the voltage plus the terminal T ₂₂ shown in FIG. 5, the same voltage is output from the terminal T _23.
[0020]
[Equation 3]

[0021]
Voltage input to the terminal _{T 21} of FIG. 5 is 2 distributed at a first power divider _{(TQ 21),} the first terminal _{T 211} of the first circulator (CIR1), and a second circulator (CIR2) is input to the first terminal T ₂₂₁ and output from the second terminal T ₂₁₂ of the first circulator (CIR1) and the second terminal T ₂₂₂ of the second circulator (CIR2), respectively. .
This output voltage is synthesized by a second power divider (TQ ₂₂ ), reflected by a second group of band-pass filters (B2, B4,..., Bn−1), and again returned to the second power divider. (TQ ₂₂ ) and output from the terminal T ₂₃ in the same manner as described above.
That is, when the voltage plus the terminal T ₂₁ shown in FIG. 5, the same voltage (or current) is output from the terminal T _23.
The length of the connecting cable, and, Q transformer type power divider _(TQ 21, TQ ₂₂₎ and power combiner if the same characteristic properties of _{(TQ 23),} the circulator shown in Fig. 5 (CIR1, CIR2) In parallel operation is equivalent to one circulator.
[0022]
However, since the voltage (or current) of the transmission wave input to the circulators (CIR1, CIR2) shown in FIG. 5 can be reduced to 1 / 、 2, the transmission wave passing through each circulator (CIR1, CIR2) can be reduced. Can be halved.
Since this means that the power capacity is doubled, the level at which the intermodulation wave (IM3) is generated is increased by 3 dB.
That is, in the multiplexer shown in FIG. 1, if the power level of the transmission wave where the intermodulation wave (IM3) is generated is P (W), in the present embodiment, the transmission wave where the intermodulation wave (IM3) is generated Can be set to 2 × P (W), and the generation of the intermodulation wave (IM3) can be reduced even when the power of the input transmission wave is large.
If the power of the input transmission wave is higher, the number of circulators to be operated in parallel is 3, 4,..., N, and the first power distributor (TQ ₂₁ ) And the number of distributions in the second power divider (TQ ₂₂ ) and the number of multiplexes in the power combiner (TQ ₂₃ ).
[0023]
In the embodiment of the present invention, in the case of a 4 number of circulators for parallel operation, circulator (CR1~CRI4), the first power divider _{(TQ 41),} a second power divider _(TQ 42), FIG. 6 shows the configuration of the power combiner (TQ ₄₃ ).
In the multiplexer shown in FIG. 6, since the power capacity is quadrupled, the level at which the intermodulation wave (IM3) is generated can be increased by 6 dB.
Further, when the number of distributions is n, the [S] matrix ([Sn]) of the power distributors (TQ ₄₁ , TQ ₄₂ ) and the power combiner (TQ ₄₃ ) is shown in the following equation (4).
[0024]
(Equation 4)

[0025]
As described above, the invention made by the inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and can be variously modified without departing from the gist of the invention. Needless to say,
[0026]
【The invention's effect】
The following is a brief description of an effect obtained by a representative one of the inventions disclosed in the present application.
According to the present invention, it is possible to provide a multiplexer capable of achieving downsizing, lowering costs, and obtaining good electrical characteristics as compared with a conventional multiplexer.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a multiplexer which is a basis of the present invention.
FIG. 2 is a graph showing attenuation characteristics and return loss of a second group of band-pass filters (B2, B4, B6) shown in FIG.
FIG. 3 is a graph showing attenuation characteristics of a first group of band-pass filters (B1, B3,..., Bn) shown in FIG.
FIG. 4 is a graph showing transmission characteristics between each input terminal (T _{1 to} T _n ) shown in FIG. 1 and an output terminal (T ₀₀ ) shown in FIG. 1;
FIG. 5 is a block diagram illustrating a schematic configuration of a multiplexer according to the embodiment of the present invention.
FIG. 6 is a block diagram showing a configuration of a circulator, a first power distributor, a second power distributor, and a power combiner when the number of circulators operated in parallel is four in the embodiment of the present invention. FIG.
FIG. 7 is a block diagram showing a schematic configuration of a conventional CIB type multiplexer.
FIG. 8 is a block diagram showing a schematic configuration of a conventional star point type multiplexer.
[Explanation of symbols]
H11, H12, H21, H22, Hn1, Hn2 ... hybrid circuit, CIR, CRI1~CRI4 ... _{circulator, TQ 21, TQ 22, TQ} 41, TQ 42 ... power _{distributor, TQ 23, TQ 43 ...} power synthesizer, B1 Bn, BF11, BF12, BF21, BF22, BFn1, BFn2: band-pass filter, R: non-reflection terminator.

Claims (3)

A first power divider having an input terminal and k (k ≧ 2) output terminals, distributing k power input to the input terminal, and outputting the k power from the k output terminals;
A first group of m (m ≧ 2) bandpass filters that are connected in parallel to the input terminal of the first power divider and allow transmission of odd or even channel transmission waves;
A second power divider having an input terminal and k output terminals, distributing k power input to the input terminal, and outputting from the k output terminals;
A second group of n (n ≧ 2) band-pass filters connected in parallel to the input terminal of the second power divider and transmitting even or odd channel transmission waves;
A second terminal having a first terminal, a second terminal, and a third terminal, wherein the first terminal is connected to each output terminal of the first power divider, K circulators each having the second terminal connected to each output terminal of
k input terminals and an output terminal, the k input terminals are respectively connected to the third terminals of the circulators, and the powers input to the k input terminals are combined, and A power combiner that outputs from an output terminal,
Each of the circulators outputs power input to the first terminal from the second terminal, and outputs power input to the second terminal from the third terminal. Combiner. 2. The multiplexer according to claim 1, wherein the first and second power dividers and the power combiner are configured by a λ / 4 type Q transformer. 3. Each band-pass filter of the first group is constituted by a low-selectivity band-pass filter,
3. The multiplexer according to claim 1, wherein each of the bandpass filters of the second group includes a bandpass filter of a high selectivity type. 4.

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