JPS635283Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a band wave generator having a 1/4 wavelength resonator, and aims to provide a small band wave wave generator that uses a flanged bobbin to reduce the number of turns. It is.

The first example of this type of conventional bandpass filter is a helical filter with three 1/4 wavelength resonators.
This will be explained with reference to FIG. Here, FIG. 1 shows a partially cutaway perspective view, and FIG. 2 shows a partial vertical cross-sectional view.
1, 1', 1'' are 1/4 polyurethane-coated copper wires, etc., spirally wound around a cylindrical plastic bobbin 2.
A wavelength resonator is installed on the insulating substrate 3, and the above 1/4
One end of the winding of the wavelength resonators 1, 1', 1'' is in an open state, and the other end is connected to a ground terminal implanted on an insulating substrate 3. 4 indicates each quarter wavelength resonator 1,
The 1/4 wavelength resonators 1, 1', 1'' are housed in a metal shield case made of aluminum or the like and has a coupling window 5 for controlling the coupling of the 1/4 wavelength resonators 1', 1''. Furthermore, the plastic bobbin 2 of the 1/4 wavelength resonators 1 and 1" at both ends is provided with an input coil 6 and an output coil 6' which are electromagnetically coupled to the 1/4 wavelength resonators 1 and 1". . Note that 7 is a core for adjusting the resonance frequency. In such a configuration,
By determining the frequency used, the length of the copper wire that resonates at 1/4 wavelength is inevitably determined, so if you want to lower the height of the helical filter, increase the diameter a of the plastic bobbin 2 and increase the winding length. Although it is possible to reduce the width b, the helical filter becomes large in the vertical and horizontal directions. On the other hand, if it is desired to make the helical filter smaller in the longitudinal and lateral directions, the diameter a of the plastic bobbin 2 may be reduced and the winding width b may be increased. However, this time it became taller, making it impossible to achieve overall miniaturization.

The present invention aims to eliminate the above-mentioned conventional drawbacks and to enable miniaturization. Embodiments of the present invention will be described below with reference to FIGS. 3 and 4. FIG. 3 shows a partially cutaway perspective view, and FIG. 4 shows a partial vertical cross-sectional view. Reference numeral 8 denotes a bobbin having a plurality of flanges 9 made of plastic and spaced at regular intervals, and this plastic bobbin 8 is divided into windings, with polyurethane-coated copper wire or the like being transferred several turns or several tens of turns for each flanges. and constitute resonance coils 10, 10', 10''.Furthermore, these resonance coils 10, 1
The resonant coils 10, 10', 10'' are placed upright on the insulating substrate 11, and one end of the resonant coils 10, 10', 10'' is open, and the other end is connected to a ground terminal planted on the insulating substrate 11. 12 is each resonance coil 10,1
The resonant coils 10, 10', 10'' are housed in a metal shield case made of aluminum or the like and has a coupling window 13 for controlling the coupling of the coils 0', 10''. Furthermore, the plastic bobbin 8 of the resonance coils 10, 10'' at both ends has the resonance coils 10, 10''.
10'' and an input coil 14 and an output coil 1 for signal injection and extraction.
4' is wound.

This is a core made of ferrite or the like provided to adjust the equivalent inductance value of the winding. FIG. 5 is an equivalent circuit diagram of the embodiment shown in FIGS. 3 and 4. FIG. L ₀ ,
C ₀ is the equivalent inductance and equivalent capacitance of each resonant coil 10, 10', 10''. L ₁ is the equivalent inductance of the input coil 14 and output coil 14', and C ₁ is the equivalent inductance of each resonant coil 10, 10', 10''. 10″
is the equivalent coupling capacitance. Note that C ₀ includes the winding distributed capacitance of each resonant coil 10, 10', 10'' and the distributed capacitance between the resonant coil 10, 10', 10'' and the shield case 12. By equipping the plastic bobbin 8 with flanges 9 at regular intervals, the equivalent capacitance C ₀ of the resonant coils 10, 10', 10'' can _be greatly increased. Coils 10, 10', 10'' can now be formed.
In other words, it is possible to significantly reduce the number of turns of the resonant coils 10, 10', 10''.Accordingly, as the number of turns decreases, the diameter d of the bobbin 8 is reduced, the vertical and horizontal directions are reduced, and the bobbin 8 is The height can also be lowered, making it possible to downsize the entire bandpass device.Furthermore, the frequency characteristics are exactly the same as the conventional example, and there is no deterioration.
Copper wire with a thicker wire diameter can also be used to improve reliability. Furthermore, as usual,
By controlling the size of the coupling window 13, the coupling state can be changed and the bandwidth can also be controlled, which has the same advantages as the conventional method.

If the input coil 14 and the output coil 14' have a large number of turns, they may be divided and wound in the same manner as the resonant coils 10, 10', and 10'' to reduce the size.Here, we have described an example composed of three elements. , other 2
The same effect can be obtained by configuring the elements and those having four or more elements in the same manner.

As described above, according to the present invention, the bandwidth can be stabilized, and the equivalent capacitance C of the resonant coil can be reduced compared to the conventional single solenoid winding or space solenoid winding. can be significantly increased, thereby reducing the equivalent inductance L. It is possible to realize a resonant coil with a small one, and it is possible to significantly reduce the number of turns of the resonant coil, resulting in the effect that it can be made smaller in the vertical and horizontal directions.

[Brief explanation of drawings]

Figure 1 is a partially cutaway perspective view of a conventional bandpass wave generator.
FIG. 2 is a partial longitudinal cross-sectional view of the conventional band wave generator, FIG. 3 is a partially cutaway perspective view of an embodiment of the band wave generator according to the present invention, FIG. 4 is a partial vertical cross-sectional view of the same, and FIG. is an equivalent circuit diagram. 8...Plastic bobbin, 9...Tsuba, 10,
10', 10''... Resonance coil, 11... Insulating board, 12... Shield case, 13... Coupling window,
14...Input coil, 14'...Output coil, 1
5...Core.

Claims (1)

[Claims for Utility Model Registration] (1) Two resonant coils formed by dividing a bobbin with a plurality of flanges at regular intervals and winding the windings in such a way that each divided winding section has a plurality of turns. The above resonant coils are installed upright on an insulating substrate, one end of which is connected to a ground terminal embedded on the insulating substrate, and the other end is left open, and the plurality of resonant coils are installed in a metal shield case having a coupling window. Store and
A band wave generator comprising an input coil and an output coil electromagnetically coupled to the resonant coil. (2) The bandpass wave device according to claim 1, wherein the input coil and the output coil are divided windings in the same manner as the resonant coil.