JPH0746961Y2 - Shared device - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention is applicable to the ultra high frequency band (UHF).
The present invention relates to a duplexer such as an antenna for a base station of a mobile communication system in a band.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view showing a common duplexer such as an antenna in a conventional ultra-high frequency band. 14 is a common shield case, 15 ₁ to 15 ₆ are rod-shaped inner conductors, and 16 ₄ is Common input or output terminals, 16 ₁ and 16 ₆ are output or input terminals,
Reference numeral 17 is a coupled line, which is provided between terminals 16 ₁ and 16 ₄ outside the common shield case 14. 18 ₂ and 18 ₃ branch point on the coupling line 17, 19 ₁ to 19 ₄ and 19 ₆ are coupling capacitance element, these 19 _1, 19 ₄ and 19 ₆ are terminals 16
₁ , 16 ₄ and 16 ₆ are individually connected to the inner conductors, and 19 ₂ and 19 ₃ are individually connected to branch points 18 ₂ and 18 ₃ of the coupling line 17. In this duplexer, the distance between the connection point of one end of the coupled line 17 and the terminal 16 ₁ , the branch points 18 ₂ and 18 ₃ , and the connection point of the other end of the coupled line 17 and the terminal 16 ₄ is set to the internal conductor. 15
₄ to form a _^1/4 of the guide wavelength corresponding to the center frequency of the passband configured bandpass wave filter by 15 _6,
The center frequency in the attenuation band of the band stop filter composed of the inner conductors 15 ₁ to 15 ₄ and the coupling line 17 and the center frequency in the pass band of the band pass filter composed of the inner conductors 15 ₄ to 15 ₆ . Are formed to match. Of the signals input to the common terminal 16 ₄ , the frequency signal within the pass band of the band pass filter is output from the terminal 16 ₆ and is not attenuated in the band stop filter and output from the terminal 16 ₁ Of the signals input to terminal 16 ₄ ,
The frequency signal in the attenuation band of the band pass filter is output from the terminal 16 ₁ without being output from the terminal 16 ₆ .

[0003]

[Problems to be Solved by the Invention]
Common sheet - Rudoke - to internal conductor 15 to the _first rod-shaped scan 14
15 ₆ is provided, and since the coupling line 17 is provided outside the common shield case 14, the overall configuration is complicated,
Further, it is impossible to avoid manufacturing error of each part and assembling error of each part, and therefore it is not possible to omit the adjustment work for providing the required electric characteristics.

[0004]

SUMMARY OF THE INVENTION The present invention is a band stop filter.
Centering frequency of the passband and the conductor for forming the container
Bandpass matching the center frequency of the attenuation band in the filter
A dielectric substrate provided with a conductor for forming a filter and an inner surface
Insert the peripheral edge of the dielectric substrate into the groove formed and
Equipped with a common shield case that internally supports the electric board
And a band stop filter provided on the dielectric substrate.
Forming conductor is provided on the surface of the dielectric substrate,
A plurality of lower ends of which are grounded to the common shield case
Inner conductor forming conductor and the surface of the dielectric substrate.
For forming a plurality of internal conductors whose lower ends are grounded
It is provided at a position that is appropriately spaced from each upper end of the conductor.
Coupling line whose edge is grounded to the common shield case
Of the formation ground conductor and the back surface of the dielectric substrate, the
The ground for forming the coupling line provided on the surface of the dielectric substrate
Provided at the location corresponding to the conductor, the entire length is
Of the guide wavelength corresponding to the center frequency in the attenuation range of the vessel
It is an integral multiple of / 4, with one end as the start end, and 1 of the guide wavelength.
/ 4 and coupling line forming conductor having a branch point for each interval, before
Note that a plurality of internal conductor forming conductors whose bottom ends are grounded
Of which, the upper end of the conductor for forming the first or last stage internal conductor,
Conductors for forming a coupling capacitance element facing each other through the dielectric substrate
The body and the conductor for forming the coupling capacitance element to form the coupling line
Conductor connected to one end of the conductor and a common input or output terminal
A body and a plurality of internal conductors whose lower ends are grounded
Of the conductors for forming the inner conductor of the final or first stage
Coupling capacitor element type with end portions facing each other through the dielectric substrate
The coupling conductor is formed by combining the production conductor and the coupling capacitor element forming conductor.
Conductor connected to the other end of the path forming conductor and the output or input terminal
A body and a plurality of internal conductors whose lower ends are grounded
Of the conductor for forming the inner conductor of the intermediate stage
Conductors for forming a coupling capacitance element facing each other through the dielectric substrate
The body and the conductor for forming the coupling capacitance element to form the coupling line
More it becomes a conductor connected to the branch point of use conductor, the induction
The conductor for forming the bandpass filter provided on the electric substrate is
It is provided on the surface of the dielectric substrate, and one end of each is the common shield.
A plurality of internal conductor forming conductors grounded to the shield case
And a plurality of internal conductors whose one end is grounded
Of the conductors, non-contact with the conductor for forming the inner conductor at the final stage or the first stage
Coupled capacitive element forming conductor facing the ground end and this coupling
Conductor for connecting the capacitive element forming conductor to the output or input terminal
This is intended to eliminate the conventional drawbacks by realizing a duplexer consisting of

[0005]

1 is a front view showing an embodiment of the present invention, FIG. 2 is a side view, FIG. 3 is a sectional view taken along line AA of FIG. 1, and FIG. 4 is a sectional view taken along line BB of FIG. in each figure, 1 ₁ and 1 ₂ are common sheet -
Rudoke - scan sidewalls of, 1 ₃ and 1 ₄ is the end wall, 1 ₅ upper wall, 1 ₆ the lower wall, 2 ₄ is a common input or output terminal, 2 ₁ and 2 ₆ output or input terminal, these Shi, for example made of coaxial connector, although not shown in the figure each inner conductor of the coaxial connector 2 _1, 2 ₄ and 2 ₆ common - Rudoke - so as not to contact the scan, coaxial connector 2 _1, 2 ₄ and 2 ₆ each inner conductor and the common sheet of - Rudoke - scan or providing an air gap between, are an insulating layer interposed therebetween. Reference numeral 3 denotes a dielectric substrate, on the front and back surfaces of which a band-pass filter and a band-stop filter are provided.

[0006] FIG. 5 (a), the surface view of the dielectric substrate 3, in FIG. 5 (b) back view, _{4 1} to _{4 6} inner conductor, 5 denotes a ground conductor, 6 and 7 interstage coupling blocking A conductor 8 is an interference prevention conductor between the filters, and one end of each of the interstage coupling prevention conductors 6 and 7 and the interference prevention conductor 8 between the filters is connected to the ground conductor 5. The conductors are provided on the front surface (or the back surface) of the dielectric substrate 3 by a printed wiring method such as an etching method. 9 ₁ to 9 ₄ and 9 ₆ are conductors that form a coupling capacitance element, 10 ₁ to 10 ₄ and 10 ₆ are connection conductors, and 11 forms a coupling line together with the ground conductor 5 provided on the surface of the dielectric substrate 3. Conductors, connecting conductors 10 ₁ and 10
It is provided between _four . Reference numerals 12 ₂ and 12 ₃ denote branch points in the conductor 11 for forming a coupled line, which is the conductor 1 for forming a coupled line.
The length between one end of 1 and the branch point 12 ₂ , the branch point 12 ₂ and the branch point
The length between the points 12 _3, guide for the formation of the branch point 12 ₃ and the coupling line
The lengths between the other ends of the body 11 are λ _g / 4 (λ _g is
In the attenuation range of the band-stop filter that constitutes the duplexer
Configure the duplexer of the present invention with the guide wavelength corresponding to the center frequency.
Corresponding to the center frequency in the pass band of the band pass filter
It is also a guide wavelength. ) Is formed . The above conductors are also provided on the back surface (or front surface) of the dielectric substrate 3 by a printed wiring method such as an etching method. FIG inner conductor _{4 1} in 5 (a) to _{4 4} 及
Beauty 4 _6, the interstage coupling prevents conductors 6 and 7, the interference between the wave filter inhibitory
Between each lower end of the stop conductor 8 and the lower edge of the dielectric substrate 3,
There is a part of the dielectric substrate 3 where the background is exposed.
Body 4 upper portion ₅ and the upper edge of the ground conductor 5 and the dielectric substrate 3
The part where the background of the dielectric substrate 3 is exposed between the upper edge
5B, the connecting conductors 10 ₁ , 10 ₄ in FIG.
And between the upper ends of 10 ₆ and the upper edge of the dielectric substrate 3.
There is a portion where the background of the dielectric substrate 3 is exposed.
When assembling the proposed duplexer, the dielectric substrate
The lower edge of 3 is the inner surface of the lower wall ₁₆ of the common shield case.
And fitted into the groove 13 ₆ bored, internal guide in FIGS. 5 (a)
Bodies 4 ₁ to 4 ₄ and 4 ₆ , interstage coupling prevention conductor 6 and
7. Each lower end of the interference prevention conductor 8 between the filters is
With the bottom wall 1 ₆ electrically connected Rudokesu,
Dielectric wall upper edge on a common shield case of the substrate 3 1 _5
5 into the groove 135 formed on the inner surface of the
It takes the upper and the upper edge of the ground conductor 5 of the inner conductor 4 _5, FIG.
5 (b) the connection conductors ₁₀ 1 in 10 ₄ and 10 ₆
Each upper portion is electrically an upper wall 1 ₅ of the common shield case
Connected to .

[0007] inner conductor 4 ₁ is coupled to one end and the terminal 2 _first through a forming conductor 9 ₁ and the connection conductors 10 ₁ coupling capacitance element coupling line forming conductor _11, formed conductor 9 ₂ and the connection of the coupling capacitance element Branching of the coupling line forming conductor 11 via the inner conductor 4 ₂ coupled to the branch point 12 ₂ of the coupling line forming conductor 11 via the conductor 10 ₂ , the coupling capacitance element forming conductor 9 ₃ and the connecting conductor 10 _3. The inner conductor 4 ₃ coupled to the point 12 ₃ , the forming conductor 9 ₄ of the coupling capacitive element and the connecting conductor 10
₄ through the other end and the common terminal of the coupling line forming conductor 11
The second inner conductors 4 connected ₄ to ₄ and a common shield case, the band-stop filtering unit guide wavelength corresponding to the central frequency in the attenuation band is lambda _g is formed. Via the inner conductor 4 ₄ and the inner conductor 4 ₅ which are coupled to the common terminal 2 ₄ via the formation conductor 9 ₄ of the coupling capacitance element and the connection conductor 10 ₄ and the formation conductor 9 ₆ of the coupling capacitance element and the connection conductor 10 _6. the inner conductor 4 ₆ and a common shielding case that is coupled to terminal 2 _6, the band-pass device guide wavelength corresponding to the center frequency in the pass band is lambda _g is formed. Although the drawings are to illustrate the case of forming the interdigital bandpass wave filter by an internal conductor 4 ₄ to 4 _6, to the inner conductor 4 ₄ not to form a comb-line band-pass wave filter 4 ₆ May be provided.

[0008] Common sheet - Rudoke - scan of the end wall 1 ₃ and 1 ₄ in the groove 13 ₃ and 13 ₄ bored (Fig. 3), the upper wall 1 ₅ and the lower wall grooves 13 ₅ bored in 1 ₆ and 13 ₆ (Figure 4), fitted the edge of the dielectric substrate 3, common sheet - Rudoke - scan sidewalls of 1 ₁ and 1 _2, end walls 1 ₃ and 1 _4, the top wall 1 ₅ and the lower wall 1 ₆ by binding together the dielectric substrate 3 is common sheet - Rudoke - fixed to the desired position in the scan, the inner conductor 4 ₁ to 4 ₆ each short end and the grounding conductor of which is provided on the surface of the dielectric substrate 3 5 is common - Rudoke - Graphics and electrically connected with the connection conductors 10 ₁ provided on the rear surface of the dielectric substrate 3, 10 ₄ and 10 ₆ are coaxial connector
2 _1, is connected to the 2 ₄ and the inner conductors of the two ₆ to each other. In addition,
If necessary, the thin metal layer deposited on the edge of the dielectric substrate 3, in common with the edge of the dielectric substrate 3 - Rudoke - between to the groove 13 ₃ no bored to scan the wall surface 13 ₆ by fixing by means such as soldering, to the inner conductor 4 ₁ formed in the dielectric substrate 3 and each short end and the ground conductor 5 4 ₆ common sheet - to ensure electrical connection between the scan - Rudoke At the same time, the mechanical coupling between the dielectric substrate 3 and the common shield case can be strengthened.

FIG. 6 is an equivalent circuit diagram of the duplexer of the present invention, in which T ₄ is a common input or output terminal, T ₁ and T ₆ are output or input terminals, R ₁ to R ₆ are resonant circuits, and CC is a coupled line. , M ₄₅ and M
₅₆ is a magnetic field coupling coefficient. Thus constituted merits duplexer, of the input signal to the common terminal 2 _4, inner conductors 4 ₄
The frequency signal in the pass band of the band pass filter consisting of 4 to 4 ₆ is output from the terminal _26, and the band stop filter formed by the inner conductors 4 ₁ to 4 ₄ and the coupled line consisting of the conductor 11 and the ground conductor 5. not be output from the terminal 2 ₁ attenuated in duplexer. Common terminal 2 ₄ of the input signal into a frequency signal attenuation region in the inner conductor 4 ₄ to the band-pass unit consisting of _4-6, without outputting from the terminal 2 _6, terminal
2 Output from ₁ . Bandpass filter consisting of inner conductors 4 ₄ to 4 ₆ , inner conductors 4 ₁ to 4 ₄ and conductor 11 and ground conductor 5
The interference prevention conductor 8 interposed between the filter and the band stop filter formed by the coupling line prevents the interference between the two filters, and the frequency corresponding to the pass band of the band pass filter. The components of the signal that are reflected or under-attenuated in the band stop filter are blocked by the interstage coupling stop conductors 6 and 7. When the blocking effect of the interstage coupling prevention conductors 6 and 7 may be insufficient, a common shield cable corresponding to the installation position of the interstage coupling prevention conductors 6 and 7 may be provided.
Either by projecting blocking conductor from the inner wall surface plate of the scan, or common sheet - Rudoke - between scan the inner wall surface of the dielectric substrate 3 in the inner conductor 4 ₁ and 4 ₂ and between the inner conductor 4 ₂ with at a location corresponding to between 4 _3, it may be provided blocking conductor parallel to the rod-like inner conductor 4 ₁ to 4 _3. In the above, the case where the band-stop filter is composed of four-stage inner conductors and the band-pass filter is composed of three-stage inner conductors has been exemplified, but the present invention is implemented by appropriately increasing or decreasing the number of stages. can do.

[0010]

EFFECTS OF THE INVENTION In the duplexer of the present invention, each element constituting the band stop filter and the band pass filter is formed by a thin metal layer adhered to the front and back surfaces of the dielectric substrate. The coupling line forming the filter is provided inside the common shield case without being provided outside the common shield case as in the conventional case, and therefore the overall configuration is simple and compact. Moreover, it is easy to exactly match the dimensions and arrangement relationship of the conductors forming each element with required values, and further,
It is easy to assemble because it is formed so that the edge of the dielectric substrate fits into the groove formed in the inner wall of the common shield case.
It is possible to strengthen the mechanical coupling between the common shield case and the dielectric substrate, and the common shield case and input / output terminals with the constituent elements provided on the front and back surfaces of the dielectric substrate. The electrical connection can be ensured, which is suitable for mass production.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view showing an embodiment of the present invention.

FIG. 3 is a sectional view showing an embodiment of the present invention.

FIG. 4 is a sectional view showing an embodiment of the present invention.

FIG. 5 is a view showing the main part of an embodiment of the present invention.
5A is a front view and FIG. 5B is a back view.

FIG. 6 is an equivalent circuit diagram of the duplexer of the present invention.

FIG. 7 is a cross-sectional view showing a conventional duplexer.

[Explanation of symbols]

1 ₁ Side wall of common shield case 1 ₂ Side wall of common shield case 1 ₃ End wall of common shield case 1 ₄ End wall of common shield case 1 ₅ Common Upper wall of shield case 1 ₆ Lower wall of common shield case 2 ₁ Output or input terminal 2 ₄ Common input or output terminal 2 ₆ Output or input terminal 3 Dielectric substrate 4 ₁ Inner conductor 4 ₂ Inner conductor 4 ₃ Inner conductor 4 ₄ Inner conductor 4 ₅ Inner conductor 4 ₆ Inner conductor 5 Ground conductor 6 Interstage coupling prevention conductor 7 Interstage coupling inhibition conductor 8 Interference interference prevention conductor 9 ₁ Coupling element forming conductor 9 ₂ Forming conductor of coupling capacitance element 9 ₃ Forming conductor of coupling capacitance element 9 ₄ Forming conductor of coupling capacitance element 9 ₆ Forming conductor of coupling capacitance element 10 ₁ Connection conductor 10 ₂ Connection conductor 10 ₃ Connection conductor 10 ₄ Connection conductor 10 ₆ connection conductors 11 coupled line forming conductor 12 ₂ branch point 12 ₃ branch point 13 _third groove 13 ₄ grooves 13 ₅ grooves 13 ₆ grooves 14 common sheet - Rudoke - scan 15 ₁ inner conductor 15 ₂ Conductor 15 _third inner conductor 15 ₄ inner conductor 15 ₅ inner conductor 15 ₆ internal conductor 16 _{and one} output or input terminal 16 ₄ common input or output terminal 16 ₆ output or input terminal 17 coupling line 18 ₂ branch points 18 ₃ branch point 19 ₁ Coupling capacitance element 19 ₂ Coupling capacitance element 19 ₃ Coupling capacitance element 19 ₄ Coupling capacitance element 19 ₆ Coupling capacitance element

Claims (1)

[Scope of utility model registration request] 1. A conductor for forming a band stop filter and a pass band
The center frequency is the center of the attenuation band in the band stop filter.
And a conductor for forming a bandpass filter matching the frequency
The dielectric substrate and the groove formed in the inner surface by fitting the peripheral edge of the dielectric substrate.
A common shield case that internally supports the dielectric substrate.
And a conductor for forming a band stop filter provided on the dielectric substrate.
A body is provided on the surface of the dielectric substrate, and each lower end is the common
For forming multiple internal conductors that are grounded to the shield case of
Of the conductor and the surface of the dielectric substrate, each of the lower ends is grounded.
The upper end of each of the multiple inner conductor forming conductors
It is installed in the place where it is separated, and the upper edge is the common shield case.
A grounding conductor for forming a coupled line that is grounded to the ground, and a backside of the dielectric substrate on the front surface of the dielectric substrate.
Location corresponding to the provided ground conductor for forming the coupled line
Is provided in the attenuation band of the band-stop filter.
It is an integer multiple of 1/4 of the guide wavelength corresponding to the center frequency,
Starting from the end, branch points at intervals of ¼ of the guide wavelength
For forming a coupled line, and a plurality of conductors for forming an internal conductor whose lower ends are grounded
Of the inner conductor forming conductor in the first or last stage
And forming a capacitive coupling element facing each other through the dielectric substrate
And a conductor for forming the coupling capacitance element,
Connect to one end of forming conductor and common input or output terminal
Conductors and a plurality of inner conductor forming conductors whose lower ends are grounded
The upper end of the inner or inner conductor forming conductor
Conductors for forming a coupling capacitance element facing each other through the dielectric substrate
The body and the conductor for forming the coupling capacitance element to form the coupling line
A conductor connected to the other end of the conductor for output and an output or input terminal, and a plurality of conductors for forming internal conductors whose lower ends are grounded
Of the inner conductor forming conductor in the middle stage
A conductor for forming a coupling capacitance element facing each other through an electric substrate, and
The conductor for forming the coupling capacitance element is the conductor for forming the coupling line.
Of a conductor connected to the branch point of, and a conductor for forming a bandpass filter provided on the dielectric substrate.
A body is provided on the surface of the dielectric substrate, and one end of each body is connected to the common shield.
A plurality of internal conductor forming conductors grounded to the shield case
And a plurality of internal conductor forming conductors each of which is grounded
Of the above, the non-grounded end of the conductor for forming the final or first stage internal conductor
For forming a coupling capacitance element facing the section and this coupling capacitance
A conductor that connects the element forming conductor to the output or input terminal
Duplexer characterized by comprising Ri.