A filter input and output structure and dielectric duplexer

Abstract

The present invention provides a filter input-output structure and a dielectric duplexer, wherein the filter input-output structure comprises a common tap cavity, a frequency modulation structure is provided on one surface of the common tap cavity, the frequency modulation structure is in the shape of a slot, a protrusion is provided in the middle of the frequency modulation structure, a feeding hole is provided on the surface of the common tap cavity opposite to the frequency modulation structure, the vertical projection of the feeding hole falls within the vertical projection range of the protrusion, the feeding hole is a blind hole, a feeding ring is provided around the opening of the feeding hole, the common tap cavity, the frequency modulation structure and the feeding hole surface are all covered with a conductive layer, and the feeding ring area is not covered with a conductive layer. The present invention changes the existing frequency modulation blind hole into a slot shape and provides a protrusion in the frequency modulation structure, so that the feeding hole can extend into the frequency modulation structure. By changing the depth of the feeding hole or the spacing between the feeding hole and the frequency modulation blind hole, the input and output coupling size can be adjusted, so that it can be suitable for large bandwidth applications and strong coupling occasions.

Description

Technical Field

[0001] The invention relates to dielectric filter technology, and in particular to a filter input and output structure and a dielectric duplexer. Background Art

[0002] With the development of mobile communication technology, communication equipment is moving towards miniaturization and integration. Ceramic dielectric filters have become one of the mainstream choices for 5G filters due to their small size and light weight. At present, the working bandwidth of ceramic dielectric filters is around 150MHz to 250MHZ, and the corresponding input and output structure is a coupled blind hole. Figure 1 As shown, the principle is that electric field coupling (capacitive coupling) is formed between the coupling blind hole 101 and the FM blind hole 102 on the tap cavity 104, and the feeding ring 103 around the opening of the coupling blind hole 101 is used to input and output signals. When the FM blind hole 102 remains unchanged, the shallower the coupling blind hole 101 and the larger the gap between the coupling blind hole 101 and the FM blind hole 102, the weaker the electric field coupling, and vice versa. In some applications that require large bandwidth, such as dielectric duplexers, the operating bandwidth can be as high as 400 to 800 MHz, and stronger input and output coupling is required. Figure 1 The solution shown will result in a gap between the coupling blind hole and the tuning blind hole being too small, which is difficult to implement. Summary of the invention

[0003] The object of the present invention is to provide a filter input-output structure which is suitable for a large working bandwidth and can achieve stronger input-output coupling.

[0004] Another object of the present invention is to provide a dielectric duplexer with the above-mentioned input and output structure.

[0005] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0006] According to one aspect of the present invention, there is provided a filter input-output structure, comprising a common tap cavity, a frequency modulation structure being provided on one surface of the common tap cavity, the frequency modulation structure being in a groove shape, a protrusion being provided in the middle of the frequency modulation structure, a feeding hole being provided on the surface of the common tap cavity opposite to the frequency modulation structure, the vertical projection of the feeding hole falling within the vertical projection range of the protrusion, the feeding hole being a blind hole, a feeding ring being provided around the opening of the feeding hole, the common tap cavity, the frequency modulation structure and the feeding hole surface being all covered with a conductive layer, and the feeding ring region being not covered with a conductive layer.

[0007] In one embodiment, the frequency modulation structure of the filter input-output structure is an annular groove, the protrusion is cylindrical, and the frequency modulation structure is coaxial with the protrusion.

[0008] In one embodiment, the feeding hole of the filter input-output structure is coaxial with the protrusion.

[0009] In one embodiment, the common tap cavity of the filter input-output structure is a cylinder or a polygonal column.

[0010] In one embodiment, the conductive layer of the filter input-output structure is a silver layer.

[0011] According to another aspect of the present invention, a dielectric duplexer is provided, comprising a dielectric substrate, the dielectric substrate being provided with a frequency hole, an RX receiving port, a TX transmitting port, an ANT port and a coupling slot, the ANT port adopting the filter input and output structure as described in any one of claims 1 to 5.

[0012] In one embodiment, the surface of the dielectric substrate, the inner surface of the frequency hole, and the side surfaces of the coupling slots of the dielectric duplexer are all covered with a conductive layer.

[0013] In one embodiment, the operating frequency band of the dielectric duplexer is 1805 MHz to 1880 MHz or 2110 MHz to 2170 MHz.

[0014] In one embodiment, the ANT port of the dielectric duplexer covers a frequency band of 1805-2170 MHz, and the operating bandwidth of the ANT port is 365 MHz.

[0015] The beneficial effect of the embodiment of the present invention is that the existing frequency modulation blind hole is changed into a slot shape, and a protrusion is provided in the frequency modulation structure, so that the feed hole can extend into the frequency modulation structure. By changing the depth of the feed hole or the spacing between the feed hole and the frequency modulation blind hole, the input and output coupling size can be adjusted, so that it can be applied to large bandwidth applications and strong coupling occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] The above features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily drawn to scale, and components with similar related properties or features may have the same or similar reference numerals.

[0018] Figure 1 It is a schematic diagram of the coupling structure of the input and output of the dielectric filter in the prior art;

[0019] Figure 2 It is a schematic diagram of the input and output structure of the filter according to an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a dielectric duplexer according to an embodiment of the present invention;

[0021] Among them: 101-coupling blind hole; 102-FM blind hole; 103-feeding ring; 104-tap cavity; 201-common tap cavity; 202-FM structure; 203-protrusion; 204-feeding hole; 205-feeding ring; 301-dielectric duplexer; 302-RX receiving port; 303-TX transmitting port; 304-ANT port; 305-common tap cavity; 306-FM structure; 307-coupling partition slot; 308-frequency hole. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0023] like Figure 2 As shown, an embodiment of the present application provides a filter input-output structure, including a common tap cavity 201. The common tap cavity 201 can be made of dielectric materials such as ceramics, and can be a multi-prism such as a cylinder or a cube. A frequency modulation structure 202 is provided on the upper surface of the common tap cavity 201. The frequency modulation structure 202 can be a groove shape such as a circular groove or a square groove. A protrusion 203 is provided in the middle of the frequency modulation structure 202. Similarly, the protrusion 203 can also be a cylinder or a multi-prism. A feeding hole 204 is provided on the lower surface of the common tap cavity 201. The vertical projection of the feeding hole 204 falls within the vertical projection range of the protrusion 203, so that when the feeding hole 204 is deep, it can extend into the protrusion 203 and will not be connected to the frequency modulation structure 202. The feeding hole 204 is a blind hole, and a feeding ring 205 is arranged around the opening of the feeding hole 204. The surfaces of the common tap cavity 201, the frequency modulation structure 202 and the feeding hole 204 are all covered with a metal conductive layer of silver or other materials. The feeding ring 205 area is not covered with a conductive layer, exposing the dielectric material of the common tap cavity 201, and electromagnetic wave signals can be input or output through the feeding ring 205.

[0024] The above structure can adjust the input and output coupling by changing the depth of the feeding hole 204 or the distance between the feeding hole 204 and the frequency modulation structure 202. The deeper the depth of the feeding hole 204, the stronger the coupling, and vice versa; the smaller the distance between the feeding hole 204 and the frequency modulation structure 202, the stronger the coupling, and vice versa. The distance between the feeding hole 204 and the frequency modulation structure 202 can be adjusted by changing the position of the feeding hole 204 or the radius of the feeding hole 204, thereby reducing the difficulty of processing and being able to produce stronger input and output coupling.

[0025] In a possible embodiment, the frequency modulation structure 202 is an annular groove, the protrusion 203 is cylindrical, and the frequency modulation structure 202 is coaxial with the protrusion 203. This structure is more convenient to process and groove.

[0026] Furthermore, the feeding hole 204 is coaxially arranged with the protrusion 203. At this time, the distances from each point on the side wall of the feeding hole 204 to the inner wall of the frequency modulation structure 202 are the same, and the distance between the feeding hole 204 and the frequency modulation structure 202 is only related to the radius of the feeding hole 204, so it is easier to control and adjust.

[0027] like Figure 3 As shown, another embodiment of the present application further provides a dielectric duplexer 301, including a dielectric substrate, on which a frequency hole 308, an RX receiving port 302, a TX transmitting port 303, and an ANT port 304 are provided, and a coupling partition 307 that runs through the dielectric substrate is provided. The ANT port 304 adopts the above-mentioned filter input and output structure, and a virtual common tap cavity 305 is formed around the ANT port 304, and a frequency modulation structure 306 is provided on the upper surface of the common tap cavity 305. The surface of the dielectric substrate, the inner surface of the frequency hole 308, and the side of the coupling partition 307 are all covered with a conductive layer.

[0028] Due to the use of the filter input and output structure, the working frequency band of the dielectric duplexer 301 can reach 1805MHz to 1880MHz or 2110MHz to 2170MHz. The ANT port 304 covers the frequency band of 1805 to 2170MHz, and the working bandwidth of the ANT port 304 is 365MHz.

[0029] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0030] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

[0031] The above description is only a preferred example of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A filter input and output structure, characterized in that: It includes a common tap cavity, a frequency modulation structure is provided on one surface of the common tap cavity, the frequency modulation structure is in a groove shape, a protrusion is provided in the middle of the frequency modulation structure, a feeding hole is provided on the surface of the common tap cavity opposite to the frequency modulation structure, the vertical projection of the feeding hole falls within the vertical projection range of the protrusion, the feeding hole is a blind hole, a feeding ring is provided around the opening of the feeding hole, the common tap cavity, the frequency modulation structure and the feeding hole surface are all covered with a conductive layer, and the feeding ring area is not covered with a conductive layer.

2. The filter input-output structure according to claim 1, characterized in that: The frequency modulation structure is an annular groove, the protrusion is cylindrical, and the frequency modulation structure is coaxial with the protrusion.

3. The filter input-output structure according to claim 2, characterized in that: The feeding hole is coaxial with the protrusion.

4. The filter input-output structure according to claim 1, characterized in that: The common tap cavity is a cylinder or a polygonal column.

5. The filter input-output structure according to claim 1, characterized in that: The conductive layer is a silver layer.

6. A dielectric duplexer, characterized in that: The invention comprises a dielectric substrate, on which a frequency hole, an RX receiving port, a TX transmitting port, an ANT port and a coupling slot are provided, and the ANT port adopts the filter input and output structure as claimed in any one of claims 1 to 5.

7. The dielectric duplexer according to claim 6, characterized in that: The surface of the dielectric substrate, the inner surface of the frequency hole and the side surface of the coupling slot are all covered with a conductive layer.

8. The dielectric duplexer according to claim 6, characterized in that: The working frequency band of the dielectric duplexer is 1805 MHz to 1880 MHz or 2110 MHz to 2170 MHz.

9. The dielectric duplexer according to claim 6, characterized in that: The ANT port covers a frequency band of 1805 to 2170 MHz, and the operating bandwidth of the ANT port is 365 MHz.

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