An ultra-wideband multiplexer

Abstract

This invention relates to an ultra-wideband multiplexer. The first input covers a first low-frequency band (1695-1780MHz) and a first high-frequency band (2110-2200MHz). A second common cavity, a first common cavity, and a first low-pass filter are coupled out to the first low-frequency band and the first high-frequency band, respectively, through a first band-pass filter and a second band-pass filter. The second input covers a second frequency band (1850-2000MHz) and is coupled to the output through a third band-pass filter, the first common cavity, and a first low-pass filter. The third input covers a third low-frequency band (2300-2700MHz) and a third high-frequency band (3300-4200MHz & 5100-6000MHz). The third low-frequency band is coupled to the output through a second low-pass filter, a fourth band-pass filter, the first common cavity, and the first low-pass filter. The third high-frequency band is coupled to the output through a fifth band-pass filter. This multiplexer has a small size.

Description

Technical Field

[0001] This invention relates to a combiner, and more particularly to an ultra-wideband multiplexer. Background Technology

[0002] 5G communication is a communication technology currently under full-scale construction. Its high frequency and wide operating bandwidth place high demands on the design of each port tap. The current combiner market is highly competitive, with numerous small-size designs emerging. Many manufacturers are continuously researching designs that meet customer performance specifications with minimal dimensions. However, existing tapped combining methods can no longer achieve small-size structures. Summary of the Invention

[0003] To address the above problems, this invention provides an ultra-wideband multiplexer capable of realizing a small-size combiner. The specific technical solution is as follows:

[0004] An ultra-wideband multiplexer includes an output terminal and further includes: a first input terminal covering a first low-frequency band of 1695-1780MHz and a first high-frequency band of 2110-2200MHz, wherein the first low-frequency band is coupled to the output terminal through a second common cavity, a first bandpass filter, and a first low-pass filter, and the first high-frequency band is coupled to the output terminal through the second common cavity, a second bandpass filter, the first common cavity, and the first low-pass filter; and a second input terminal covering a second frequency band of 1850MHz. -2000MHz, the second frequency band is coupled to the output terminal through the third bandpass filter, the first common cavity and the first low-pass filter; the third input terminal covers the third low frequency band 2300-2700MHz and the third high frequency band 3300-4200MHz & 5100-6000MHz, the third low frequency band is coupled to the output terminal through the second low-pass filter, the fourth bandpass filter, the first common cavity and the first low-pass filter, and the third high frequency band is coupled to the output terminal through the fifth bandpass filter.

[0005] Preferably, the first bandpass filter comprises five bandpass filters connected in sequence; the second bandpass filter comprises four bandpass filters connected in sequence.

[0006] Preferably, the third bandpass filter comprises six bandpass filters connected in sequence.

[0007] Preferably, the fourth bandpass filter comprises six bandpass filters connected in sequence; the fifth bandpass filter comprises eight bandpass filters connected in sequence.

[0008] Preferably, the input tap structure is a capacitive probe structure.

[0009] Preferably, reinforcing ribs are added between the resonators of the filter, the resonators are irregular squares, and the two resonators form a surface coupling.

[0010] A combining method for an ultra-wideband multiplexer involves combining one bandpass filter and a lowpass filter, and then connecting the output port of the lowpass filter in series with another bandpass filter.

[0011] Preferably, when implementing coupling between resonators in an ultra-wideband bandpass filter, the resonator spacing is brought closer, reinforcing ribs are added between the resonators, and the resonators are designed as irregular squares to allow the two resonators to form surface coupling.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The present invention provides an ultra-wideband multiplexer that is small in size, light in weight, high in power, and has low intermodulation and low loss. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an ultra-wideband multiplexer;

[0015] Figure 2 This is a magnified view of a specific area;

[0016] Figure 3 This is a schematic diagram of an internal tap. Detailed Implementation

[0017] The present invention will now be further described with reference to the accompanying drawings.

[0018] Example 1

[0019] like Figures 1 to 3As shown, an ultra-wideband multiplexer includes a ground terminal 85, an output terminal 84, a first input terminal 81, a second input terminal 82, and a third input terminal 83. The first input terminal 81 covers a first low-frequency band of 1695-1780MHz and a first high-frequency band of 2110-2200MHz. The first low-frequency band is coupled to the output terminal 84 through a second common cavity 62, a first bandpass filter 1, a first common cavity 61, and a first low-pass filter 71. The first high-frequency band is coupled to the output terminal 84 through the second common cavity 62, a second bandpass filter 2, a first common cavity 61, and a first low-pass filter 71. The second input terminal 82 covers a second frequency band of 1850-2000MHz. The two frequency bands are coupled to the output terminal 84 through the third bandpass filter 3, the first common cavity 61 and the first low-pass filter 71; the third input terminal 83 covers the third low frequency band 2300-2700MHz and the third high frequency band 3300-4200MHz & 5100-6000MHz. The third low frequency band is coupled to the output terminal 84 through the second low-pass filter 72, the fourth bandpass filter 4, the first common cavity 61 and the first low-pass filter 71, and the third high frequency band is coupled to the output terminal 84 through the fifth bandpass filter 5.

[0020] The first bandpass filter 1 comprises five bandpass filters 11-15 connected in sequence; the second bandpass filter 2 comprises four bandpass filters 21-24 connected in sequence; the third bandpass filter 3 comprises six bandpass filters 31-36 connected in sequence; the fourth bandpass filter 4 comprises six bandpass filters 41-46 connected in sequence; and the fifth bandpass filter 5 comprises eight bandpass filters 51-58 connected in sequence.

[0021] The input tap structure is a capacitive probe structure. Reinforcing ribs are added between the resonators of the filter; the resonators are irregularly square, and two resonators form a surface coupling.

[0022] An ultra-wideband multiplexer is a three-way multiplexer:

[0023] Port1:1695-1780MHz&2110-2200MHz;

[0024] Port2: 1850-2000MHz;

[0025] Port3:2300-2700MHz&3300-4200MHz&5100-6000MHz;

[0026] Because the bandwidth from Port1 to Port3 is 4300MHz, it is no longer possible to couple these passbands using a single common cavity. The coupling between the common cavity and the first cavity is also very strong, which makes it difficult to implement product layout.

[0027] Therefore, a portion of Port3's frequency band (3300-4200MHz & 5100-6000MHz) is implemented using an eight-stage bandpass filter. The taps utilize a capacitive probe structure, connected in parallel to a first low-pass filter 71. The passband of the first low-pass filter 71 covers portions of Port1, Port2, and Port3 (2300-2700MHz). The first low-pass filter 71 provides some suppression in the 3300-4200MHz & 5100-6000MHz range. The output of the first low-pass filter 71 is connected to the first common cavity 61, covering the frequency band of Port1. Ports 1, 2, and 3 (2300-2700MHz) are coupled from the first common cavity 61 to Port 2 (1850-2000MHz) and Port 1 (1695-1780MHz & 2110-2200MHz). The two filters at Port 1 are combined together through the second common cavity 62. At Port 3 (2300-2700MHz), the second low-pass filter 72 is used to combine the 3300-4200MHz & 5100-6000MHz frequencies in parallel, similar to the method used for the ANT port.

[0028] This combiner is an outdoor type with an IP67 protection rating. The combiner consists of a housing, waterproof cover, inner cover, resonant rod, low-pass filter, connector, and other components.

[0029] An ultra-wideband multiplexer is a standard coaxial bandpass filter structure. The ANT is directly coupled to the Port3 band (3300-4200MHz & 5100-6000MHz) via capacitive probes. A first low-pass filter 71 is connected in parallel to the inner conductor of the ANT, and its output is connected to a first common cavity 61. The bandpass filter for the Port3 band (3300-4200MHz & 5100-6000MHz) consists of eight stages and has no transmission zero. The Port2 band (1850-2000MHz) is coupled out through the first common cavity 61, and its bandpass filter consists of six stages with one capacitive transmission zero. The Port1 band (1695-1780MHz & 211MHz) is also supported. The 0-2200MHz band is coupled out through the first common cavity 61. The 1695-1780MHz band consists of a four-stage bandpass filter with an inductive transmission zero. The 2110-2200MHz band consists of a five-stage bandpass filter without a transmission zero. Finally, they are combined together through the second common cavity 62. The 2300-2700MHz band of Port3 is coupled out through the first common cavity 61. The 2300-2700MHz band consists of a six-stage bandpass filter with a capacitive transmission zero. The filter output is connected to the inner conductor of Port3 through the second low-pass filter 72, with a connection method similar to that of the ANT port.

[0030] A bandpass filter in an ultra-wideband multiplexer has a bandwidth of around 800MHz, and the reflection delay of each bandpass filter needs to be less than 0.6ns. The bandpass filters need to be combined at the antenna port.

[0031] Example 2

[0032] A combining method for an ultra-wideband multiplexer involves combining two ultra-wideband bandpass filters. First, one bandpass filter and a low-pass filter are combined. Then, the output port 84 of the low-pass filter is connected in series with another bandpass filter. This facilitates the easy combining of two ultra-wideband bandpass filters. The low-pass filter primarily functions as an impedance transformer. The first inductor of the low-pass filter easily matches the capacitive tap of the bandpass filter. The tap strength of the bandpass filter can be designed to achieve a very wide bandwidth. This method can achieve 2700MHz (3300-6000MHz). The low-pass filter also provides mutual suppression and improves port isolation. This is because low-frequency bandpass filters, after passing through the capacitive transfer zero, easily generate high-order harmonics within 6000MHz, which the low-pass filter can suppress.

[0033] When implementing coupling between resonators in an ultra-wideband bandpass filter, the spacing between the resonators is brought closer, reinforcing ribs are added between the resonators, and the resonators are designed as irregular squares to allow the two resonators to form surface coupling.

[0034] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the claims of the present invention.

Claims

1. An ultra-wideband multiplexer, comprising an output terminal (84), characterized in that, Also includes: The first input terminal (81) covers a first low frequency band of 1695-1780MHz and a first high frequency band of 2110-2200MHz. The first low frequency band is coupled to the output terminal (84) through a second common cavity (62), a first bandpass filter (1), a first common cavity (61) and a first low pass filter (71). The first high frequency band is coupled to the output terminal (84) through the second common cavity (62), a second bandpass filter (2), a first common cavity (61) and a first low pass filter (71). The second input terminal (82) covers the second frequency band 1850-2000MHz, and the second frequency band is coupled to the output terminal (84) through the third bandpass filter (3), the first common cavity (61) and the first low-pass filter (71). The third input terminal (83) covers the third low frequency band 2300-2700MHz and the third high frequency band 3300-4200MHz & 5100-6000MHz. The third low frequency band is coupled to the output terminal (84) through the second low-pass filter (72), the fourth band-pass filter (4), the first common cavity (61) and the first low-pass filter (71). The third high frequency band is coupled to the output terminal (84) through the fifth band-pass filter (5). The filter has reinforcing ribs added between its resonators, which are irregular square shapes, and the two resonators are coupled in a surface.

2. The ultra-wideband multiplexer according to claim 1, characterized in that, The first bandpass filter (1) comprises five bandpass filters connected in sequence; the second bandpass filter (2) comprises four bandpass filters connected in sequence.

3. The ultra-wideband multiplexer according to claim 1, characterized in that, The third bandpass filter (3) comprises six bandpass filters connected in sequence.

4. The ultra-wideband multiplexer according to claim 1, characterized in that, The fourth bandpass filter (4) comprises six bandpass filters connected in sequence; the fifth bandpass filter (5) comprises eight bandpass filters connected in sequence.

5. The ultra-wideband multiplexer according to claim 1, characterized in that, The tap structure of the first input terminal (81), the second input terminal (82) and the third input terminal (83) is a capacitive probe structure.

6. A combining method for an ultra-wideband multiplexer, used in the ultra-wideband multiplexer as described in claim 1, characterized in that, When combining two ultra-wideband bandpass filters, first combine one bandpass filter and one lowpass filter, and then connect the output port (84) of the lowpass filter in series with another bandpass filter.

7. The combining method of an ultra-wideband multiplexer according to claim 6, characterized in that, When implementing coupling between resonators in an ultra-wideband bandpass filter, the spacing between the resonators is brought closer, reinforcing ribs are added between the resonators, and the resonators are designed as irregular squares to allow the two resonators to form surface coupling.

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