KR100859149B1 - Filter having radiant heat portion and transmitter having the same - Google Patents

Abstract

A filter having a heat radiating unit and a transmitter having the same are provided to attach and detach the filter to and from a structure such as a heat sink without a separate fixing member. A filter(100) includes a heat sink, a casing, and a filter unit. The casing is coupled with the heat sink and has input/output terminals(113) at both ends. The filter unit is mounted inside the casing, connected to the input/output terminals, and has alternately arranged first and second elements(120,130). A surface of the casing, which is in contact with the heat sink, is flat to conduct heat generated by the filter unit. A region of the filter unit, which is in contact with a bottom of a receiving unit of the casing, is flat to conduct the heat. The second element is composed of an inductor. The inductor is coupled with a heat conductive member and connected to a region inside the case to conduct the heat.

Description

Filter with heat dissipation unit and transmitter with same {FILTER HAVING RADIANT HEAT PORTION AND TRANSMITTER HAVING THE SAME}

1A is a view showing the internal structure of a conventional filter.

FIG. 1B is a side view of the filter shown in FIG. 1A.

FIG. 2A is a view showing a cross-sectional structure cut along the line “A-A” of FIG. 1A, showing the structure of a device having a low impedance value. FIG.

FIG. 2B is a view showing a cross-sectional structure cut along the line “B-B” of FIG. 1A, showing the structure of a device having a high impedance value. FIG.

3A is a front view of a filter in accordance with an embodiment of the present invention.

3B is a side view of the filter shown in FIG. 3A.

Figure 4 is a front sectional view schematically showing the internal structure of the filter shown in Figure 3a.

FIG. 5A is a view showing a cross-sectional structure cut along the line “C-C” of FIG. 4, showing a structure of a device having a low impedance value. FIG.

FIG. 5B is a view showing a cross-sectional structure cut along the line “D-D” of FIG. 4, showing a structure of a device having a high impedance value. FIG.

6 is a graph illustrating insertion loss and reflection loss characteristics of each filter of the filter according to an embodiment of the present invention.

7 is a diagram schematically illustrating a configuration of a transmitter provided with a filter according to an embodiment of the present invention.

* Description of the main parts of the drawings *

100 ... filter 110 ... casing

111 ... Body 112 ... Cover

111a ... connection 113 ... input / output terminals

120 ... capacitors 121 ... conductor blocks

122 ... Dielectric 130 ... Inductor

131 ... coil section 132 ... thermally conductive member

300 ... amplifier 400 ... antenna

The present invention relates to a filter having a heat dissipation unit and a transmitter having the same.

In general, the filter is an electric circuit for passing a signal of one frequency band and blocking other band frequency signals.

This type of filter includes a high pass filter which passes a signal in a frequency band higher than a certain frequency based on the high / low range of a passing frequency, and a low pass filter, which is the opposite, Bandpass filters that pass a specific frequency band and vice versa.

Among these filters, a lowpass filter is used to remove the harmonic components generated in the amplifier. The amplifier generates unwanted harmonic frequency components in addition to the input frequency components during the amplification of the input signal. If harmonic frequency components generated as described above are radiated through the antenna without being attenuated below a predetermined signal level, they may affect other frequencies. For this reason, research is being conducted to apply a lowpass filter to the transmitter to remove the harmonic frequency components of the final amplified signal.

As an example of such a lowpass filter, as shown in FIGS. 1A to 2B, the element 10 having a low impedance value in the form of a circular coaxial line and the element 14 having a high impedance value are alternately arranged. It is configured to remove unnecessary harmonic frequency components.

The element 10 having a low impedance value is a structure in which a dielectric 13 is filled between an outer conductor 17 and an inner conductor 12 of a coaxial cylinder, so that the diameter of the inner conductor is very large so as to operate as a capacitor having a low impedance characteristic. It is composed. In addition, the element 14 having a high impedance value is a structure in which air or a dielectric 16 is filled between the outer conductor 17 and the inner conductor 15 of the coaxial cylinder, so that the diameter thereof is very small to operate as an inductor having a high impedance characteristic. It is configured to.

The low pass filter configured as described above has an advantage of securing a wide stop band, but due to the structural characteristics of the internal components, the casing 17 has a circular structure, and thus the contact area with the heat sink 18. This very small, effective heat dissipation was difficult.

In particular, in the case of the high power low pass filter, the energy loss due to the output efficiency of the filter part is mostly converted to thermal energy. In the case of the high power low pass filter, since the input power is very high, a large amount of heat is generated. In this case, there is a cause of malfunction, deformation, failure or the like of the elements provided therein. On the other hand, a problem arises in that a signal is transmitted without the unnecessary harmonic frequency components to be removed by the filter.

In addition, since the conventional filter has a circular cross-sectional structure, a separate fixing member was required to be mounted on an apparatus such as a heat sink.

The present invention has been made in view of the above requirements, and an object of the present invention is to improve the heat dissipation structure so that it can be stably operated even in a high power input condition of KW (kilowatt) class in which high heat is generated.

Another object of the present invention is to improve the mounting structure of the filter to be easily attached / detached to a mechanism such as a heat sink without using a separate fixing member.

Another object of the present invention is to downsize the filter.

Yet another object of the present invention is to reduce the size of the filter and to increase the heat dissipation efficiency therein.

Yet another object of the present invention is to enable the application as a high-frequency low-pass filter for microwave and microwave.

The present invention provides a filter having a heat dissipation unit and a transmitter having the same in order to achieve at least one of the above objects.

Filter according to an embodiment of the present invention and the heat sink; A casing coupled to the heat sink and provided with input / output terminals at both ends; Mounted inside the casing, the first and second element parts are alternately arranged, and comprises a filter unit connected to the input / output terminals, the casing is in contact with the heat sink for the conduction of heat generated by the filter unit The flat part has a flat area, the area in contact with the bottom surface of the housing part of the casing for conduction of the generated heat, the second element part is composed of the inductor portion, the inductor portion is a thermal conductive member is coupled to the inside of the casing It may be configured to be connected for some areas and heat conduction.

According to another embodiment of the present invention, a transmitter includes an antenna; It is configured to include a filter connected to the antenna, the filter is a heat sink; A casing coupled to the heat sink and provided with input / output terminals at both ends; Mounted inside the casing, the first and second element parts are alternately arranged, and comprises a filter unit connected to the input / output terminals, the casing is in contact with the heat sink for the conduction of heat generated by the filter unit The flat part has a flat area, and the filter part has an area in contact with the bottom surface of the housing part of the casing for conduction of heat of generated heat. The second element part is composed of an inductor part, and the inductor part is coupled to a thermally conductive member. It can be configured to be connected for heat conduction with some regions of the.

Here, the first element portion may be composed of a capacitor portion. The capacitor unit may have a conductive block formed therein, a dielectric may be disposed outside the conductive block, and may have a cross-sectional structure in which a casing composed of a conductor is disposed outside the dielectric block. In this case, the bottom of the casing and / or the bottom of the dielectric in contact with the casing may be configured flat for thermal conduction.

In addition, the capacitor may have a cross section of a conductive block located therein, which may be formed of any one of a rectangle, a rectangle, a polygon, a semicircle, or a circle. In this case, when the cross section is formed of any one of a rectangle, a rectangle, or a polygon, the corner portion may be configured to be chamfered to prevent concentration of the electric field.

On the other hand, the second element portion may be composed of an inductor portion. The inductor may have a coil inductor made by winding a coil or a conductor block formed therein, and on the other hand, a dielectric may be disposed outside the conductor block and a casing formed of a conductor outside the dielectric block. It may be configured as. In addition, a thermally conductive member may be coupled to the inductor so as to be connected to a portion of the casing for thermal conductivity.

The casing may further include: a main body having an opening formed at one surface thereof and having a filter part accommodated therein; It may be configured to include a cover coupled to the opening so that the filter portion is sealed in the state accommodated therein. In this case, the fastening part may be further formed at a portion in contact with the heat sink.

In addition, the first element portion may be configured as a capacitor portion, the second element portion may be configured as an inductor or a coaxial cable, and the capacitor portion and the inductor or coaxial cable may be configured to be connected by a connection portion.

The filter having various applications as described above may be configured as a high power low pass filter, and on the other hand, may be configured for microwave or microwave.

Such a filter may be provided in a transmitter, in which case an amplifier may be further connected to the filter.

The embodiments described below will be described based on the embodiments best suited for understanding the technical features of the present invention, and the technical features of the present invention are not limited by the described embodiments. Various modifications can be made within the technical scope of the present invention through the embodiments, and such modified embodiments will fall within the technical scope of the present invention.

In order to help the understanding of the embodiments described below, in the reference numerals described in the accompanying drawings, among the components that will perform the same function in each embodiment, the related components are denoted by the same or extension numerals.

In addition, the filter according to the embodiment to be described below will be described based on a rectangular tubular filter configured by alternately arranging an inductor formed by winding a distribution capacitor and a coil of a square coaxial form, but the technical features of the present invention Phosphorus mapping is not limited to this, but includes all the filter units constituted by combining the first and second element units.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the filter according to the present invention in detail. The filter 100 may be configured to receive a filter unit in the casing 110, and the filter unit may be electrically connected to an input / output terminal 113 provided at both ends of the casing 110. The casing 110 may be configured to be in contact with the heat sink 200 so that heat generated by the filter unit may be discharged. Here, the filter unit may be configured by a combination of the first element 120 and the second element 130 described below.

According to one embodiment, the filter 100 has a flat structure in the lower region, that is, the region of the casing 110 in contact with the heat sink 200 in order to configure the contact surface with the heat sink 200 has a sufficient area. It may be configured to have.

In this structure, the casing 110 may have a hexahedral structure as shown, or may have a hexagonal or polygonal cross-sectional structure, or may have a semicircular cross-sectional structure. That is, the casing 110 may be configured to have a structure in which a portion of the casing 110 in contact with the heat sink 200 may be secured to a predetermined area or more, so that the heat conduction amount may be more sufficiently secured.

On the other hand, the casing 110 is provided with a receiving portion in order to facilitate the mounting of the filter portion accommodated therein, the body 111 having an opening on one side (one side region) and the opening of the body 111 It may be configured to be provided with a cover portion 112 to be coupled. Through this configuration, the filter 100 may be easily repaired or replaced when a slight failure occurs in some elements of the filter unit accommodated therein. Therefore, the cover 112 and the main body 111 may be coupled by fasteners (screws, rivets, bolts, etc.). The main body 111 may be further provided with a fastening hole 114 for coupling the cover portion 112.

In addition, a lower portion of the casing 110, that is, a region in contact with the heat sink 200, may further include a fastening portion 111a for facilitating coupling and detachment with the heat sink 200. Meanwhile, a fastening hole 115 for coupling with the heat sink 200 may be further formed in the fastening part 111a by a fastener (screw, rivet, bolt, etc.). Here, the fastening part 111a provided in one region of the body 111 may be formed in a configuration similar to a flange. By such a configuration, even if a separate fixing mechanism block is not provided, the filter 100 can be easily fixed to a fixture such as a heat sink simply by a fastener alone.

The configuration of the filter unit mounted in the casing 110 may be provided as shown in FIG. 4. As mentioned above, the filter unit is configured by combining the first element 120 and the second element 130. In the embodiment described below, the first element 120 is configured as a capacitor, and the second element The configuration that configures 130 as an inductor will be described as an example. Thus, capacitors and inductors corresponding to each element will be described using the same reference numerals, but each element is not limited to the capacitor and inductor described below.

The capacitor 120 may be configured as a distributed capacitor in the form of a square coaxial line inside the square metal tube. This is to correspond to the structure inside the receiving portion of the main body 111 of the casing 110 to increase the heat dissipation efficiency as mentioned above. That is, to ensure a sufficient thermal conductive surface. In addition, the inductor 130 may be provided as a coil type inductor. The filter unit formed of a combination of the capacitor 120 and the inductor 130 may be mounted inside the main body 111 to be connected to an input / output terminal 113 provided at both ends of the casing 110. .

For a more detailed description of the example of the capacitor 120, the distributed capacitor 120 is configured in a square coaxial form has a low characteristic impedance to operate as a capacitor, as shown in Figure 5a dielectric 122 ) And a rectangular cross-sectional structure therein is provided with a rectangular conductor block 121, the dielectric 122 may be configured such that at least one or more surfaces are in close contact with the body 111 and the cover 112.

In this case, the capacitance value of the distribution type capacitor having a square coaxial line shape depends on the length of the transmission line (coaxial line), the cross-sectional structure of the transmission line (coaxial line), and the dielectric constant value of the dielectric 122. Therefore, in order to obtain the capacitance value required for implementing the filter (e.g., lowpass filter, filter with high power input condition, filter for ultra high frequency (VHF) or ultra high frequency (UHF), etc.) according to the type of transmitter applied, Coaxial square cross-sectional structure, the dielectric constant value of the internal dielectric can be adjusted.

On the other hand, the cross-sectional structure of the conductive block 121 is not limited to a quadrangle as mentioned above, it may be configured in a hexagonal, polygonal or semi-circular shape. At this time, the corner portion (that is, the corner portion) in the cross-sectional structure may be a process such as chamfering or rounding to prevent the electric field from being concentrated.

The inductor 130 configured to have the high impedance value may be configured as a coil type inductor. In this case, the inductance value of the inductor 130 may be adjusted by adjusting the radius, length, and number of times of winding of the coil type inductor. You can get it. Therefore, the radius of the inductor to secure the value of inductance required to implement the filter (e.g., lowpass filter, filter with high power input condition, filter for ultra high frequency (VHF) or ultra high frequency (UHF), etc.) according to the type of transmitter applied. And length, the number of turns can be adjusted. In this configuration, when the inductor 130 is configured as a coil type inductor, the size of the filter 100 may be reduced.

Meanwhile, when the inductor 130 is configured as a coil type inductor, the coil inductor as shown in FIG. 5B to more efficiently discharge heat generated because the inductor 130 generates more heat during operation. A thermally conductive material (member) may be applied to the periphery 130 to form a heat transfer path between the inductor 130 and the casing 110. By such a configuration, heat generated by the inductor 130 can be transferred to the casing 110 to which the heat sink 200 is coupled through the thermally conductive member, thereby achieving a stable operation. On the other hand, in the case of the high power low pass filter, a high power signal is applied, so that a higher heat is generated in the coil type inductor. Therefore, for the stable operation of the low-pass filter for high power it can be expected more stable operation through the configuration as described above.

On the other hand, if the size of the filter is applied to a system that is not limited, the inductor 130 applied to the filter may be implemented as an inductor having a coaxial structure. In this case, a heat transfer path between the inductor 130 and the casing 110 may be formed by applying a thermally conductive member to the inductor having the coaxial structure as described above.

Capacitor 120 and inductor 130 having the above configuration may be configured to be alternately arranged inside the casing 110, in which case the capacitor 120 and the inductor 130 by the connection unit 140 The electrical connection between the two may be made easier. The connection unit 140 may be implemented as a metal (or electric component) having excellent conductivity generally known to enable electrical connection between two devices.

As described above, it can be seen that the heat dissipation effect is increased by the configuration of the capacitor 120 and / or the inductor 130, so that it is easy to apply to a filter that can operate in a high power input condition, and the microwave (VHF) and the microwave (UHF) It can be seen that it is easy to apply to the low pass filter.

Meanwhile, when the inner accommodating part of the casing 110 is formed in a circular shape, the cross-sectional structure of the capacitor 120 and / or the inductor 130 constituting the filter part may be formed in a circular shape.

The graph of FIG. 6 shows the lowpass characteristics of the lowpass filter as a result of simulation of insertion loss and return loss for each frequency of the filter according to the embodiment. It can be seen that the filter according to the embodiment can be stably operated.

The filter described above is applicable to the transmitter as shown in FIG.

The filter 100 as described above is disposed between the amplifier 300 and the antenna 400 so that the signal amplified by the amplifier 300 is transmitted to the filter 100. At this time, the amplifier 300 generates unnecessary harmonic frequency components 2 * f1, 3 * f1, ... in addition to the input frequency component f1 in the process of amplifying the input signal. The unwanted harmonic frequency components thus generated are transmitted to the filter 100 together with the necessary signals amplified.

The filter 100 controls the unnecessary harmonic frequency components of the transmitted signals to the antenna 400. At this time, the heat generated by the filter part of the filter 100 during operation for the removal of unnecessary harmonic frequency components can be easily released by the configuration as described above.

The filter provided with the heat dissipation unit described above and the transmitter having the same are not limited to the configuration of the above-described embodiment, but the embodiments may include various modifications within the scope of the technical idea of the present invention. It may be optionally mixed.

As described above, according to the present invention, it is possible to operate stably even in a high power input condition of KW (kilowatt) class in which high heat is generated by the improved heat dissipation structure.

In addition, according to the present invention, it is possible to easily attach / detach to a mechanism such as a heat sink without using a separate fixing member.

In addition, according to the present invention, the size of the filter can be miniaturized, and the internal heat dissipation efficiency can be increased.

In addition, according to the present invention, it can be applied as a high power low pass filter for microwave and microwave.

Claims (12)

A heat sink; A casing coupled to the heat sink and having input / output terminals at both ends thereof; It is mounted inside the casing, the first and second element parts are arranged alternately, and comprises a filter unit connected to the input / output terminal, The casing has a flat surface in contact with the heat sink for conduction of heat generated by the filter unit, The filter portion is configured to flatten the area in contact with the bottom surface of the receiving portion of the casing for conduction of the generated heat, And the second element portion comprises an inductor portion, wherein the inductor portion is configured such that a thermally conductive member is coupled and connected to a portion of the casing for thermal conductivity. The cross-section of claim 1, wherein the first element portion comprises a capacitor portion, the capacitor portion having a conductive block formed therein, a dielectric disposed outside the conductor block, and a casing disposed outside the dielectric block. And the casing lower portion and / or the lower dielectric portion in contact with the casing are flat for heat conduction. 3. The filter according to claim 2, wherein the capacitor has a cross section of a conductive block positioned therein in one of a rectangle, a rectangle, a polygon, a semicircle or a circle. 4. The filter of claim 3, wherein the capacitor has a cross section formed of one of a rectangle, a rectangle, and a polygon, and the corner portion is chamfered or rounded to prevent concentration of an electric field. delete 2. The casing of claim 1, wherein the casing includes: a main body having an opening formed at one surface thereof, and the filter part accommodated therein; And a cover coupled to the opening such that the filter part is sealed in a state accommodated therein. 7. The filter according to claim 6, wherein the main body further includes a fastening portion at a portion contacting the heat sink. The filter according to claim 1, wherein the first element portion comprises a capacitor portion, the second element portion comprises an inductor portion, and the capacitor portion and the inductor portion are connected to each other by a metal connection portion. 9. The filter according to any one of claims 1, 2, 3, 4, 6, 7, or 8, wherein the filter is a low pass filter. 10. The filter of claim 9, wherein the filter is for microwave or microwave. An antenna; It is configured to include a filter connected to the antenna, The filter is A heat sink; A casing coupled to the heat sink and having input / output terminals at both ends thereof; It is mounted in the casing, the first and second element parts are arranged alternately, and comprises a filter unit connected to the input / output terminal, The casing has a flat surface in contact with the heat sink for conduction of heat generated by the filter unit, The filter portion has a flat area that is in contact with the bottom surface of the receiving portion of the casing for conduction of heat generated heat And the second element portion includes an inductor portion, and the inductor portion is configured such that a thermally conductive member is coupled and connected to a portion of the casing for heat conduction. 12. The transmitter of claim 11, wherein an amplifier is further connected to the filter.

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