Inductive coupling structure reinforced antenna cavity combiner

Abstract

The utility model belongs to the technical field of communication, and relates to an inductive coupling structure reinforced antenna cavity combiner, which comprises a cavity, a front cover plate and a rear cover plate, the cavity comprises an outer frame, a plurality of filters and a plurality of linear connecting ribs which are integrally formed, each filter comprises an independent support column and an independent resonator, and the front cover plate and the rear cover plate are integrally formed. The linear connecting ribs are connected with the adjacent supporting columns; at least one linear connecting rib is replaced by a stepped connecting rib with equal resistance values, the stepped connecting rib comprises a first transverse part, a longitudinal part and a second transverse part, the lower end of the longitudinal part is integrally connected to the lower edge of the outer frame, and the two ends of the first transverse part are connected to the longitudinal part and one supporting column respectively; the two ends of the second transverse part are connected to the longitudinal part and the other supporting column respectively. According to the utility model, the stepped connecting ribs can enable the structural strength of the filter to be higher under the condition that the resistance value is not changed, the gap tolerance dimension requirement of adjacent resonators is met, the electrical performance of the antenna cavity combiner is ensured, and the manufacturing difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of communications, and in particular to an antenna cavity combiner with an inductive coupling structure reinforcement. Background Art

[0002] With the development of mobile communications, antenna combiners need to be lightweight and have high electrical performance requirements. It is well known that the coupling window inside the existing antenna cavity combiner achieves bandwidth by capacitive plus inductive coupling, and the layout mostly adopts a comb-type structure. The overall processing method of the product adopts aluminum die-casting in one step. The existing combiner coupling window structure is achieved by reducing the distance between resonators and adding connecting ribs, and the height of the connecting ribs is adjusted to meet the electrical performance indicators.

[0003] Chinese patent CN116666930A discloses a three-band antenna combiner, where the filter is arranged in a comb shape inside the cavity, and adjacent resonators are connected by connecting ribs, but the height of the connecting ribs is different. Some connecting ribs are close to the bottom of the cavity, resulting in the resonator being suspended too high. There are the following problems:

[0004] 1. The downlink frequency band of the combiner is mainly capacitive coupling. The height of the inductive coupling ribs is gradually reduced, and the suspended length of the support column under the resonator will gradually increase. The support column structure becomes unstable and easy to break;

[0005] 2. The cavity is mostly formed by aluminum die-casting in one step, but the support column without side support is too slender, which makes it difficult to control the die-casting accuracy and is difficult to process;

[0006] 3. When the capacitive coupling structure realizes the suppression zero point of the downlink frequency band, the distance between two adjacent resonators is very close, and the capacitance is sensitive to the change of distance, resulting in high tolerance requirements for the gap size. However, the long suspended length of the support column will amplify the tolerance of the gap, which has a great impact on the electrical performance of return loss and out-of-band suppression.

[0007] 4. The instability of the resonator intermodulation test value affects the pass rate, resulting in small production margin, difficult debugging, extended working hours, and additionally increased manufacturing costs.

[0008] Therefore, it is necessary to design a new antenna cavity combiner to avoid the above problems. Utility Model Content

[0009] The main purpose of the utility model is to provide an antenna cavity combiner with an inductively coupled structure reinforcement, which can improve the structural strength of the combiner, reduce the difficulty of forming, avoid the risk of breakage, control the gap difference between adjacent resonators, and ensure the electrical performance of the antenna cavity combiner.

[0010] The utility model achieves the above-mentioned purpose through the following technical solutions: an inductive coupling structure reinforced antenna cavity combiner, comprising a cavity and a front cover plate and a rear cover plate fixed on both sides of the cavity, the cavity comprising an integrally formed outer frame, a plurality of filters and a plurality of straight connecting ribs, the inner side surface of the front cover plate, the inner side surface of the rear cover plate and the inner side surface of the outer frame form an inner cavity, each filter comprises an independent support column and an independent resonator, the resonator is located on the lower side of the outer frame through a corresponding support column, and the straight connecting ribs connect adjacent support columns; at least one straight connecting rib is replaced by a stepped connecting rib with equal resistance value, the stepped connecting rib comprises a first transverse portion, a longitudinal portion and a second transverse portion, the lower end of the longitudinal portion is integrally connected to the lower side of the outer frame, the two ends of the first transverse portion are respectively connected to the longitudinal portion and a support column, and the two ends of the second transverse portion are respectively connected to the longitudinal portion and another support column.

[0011] Specifically, the distance between each linear connecting rib and the lower edge of the outer frame is not less than a set distance a, and different linear connecting ribs are not located at the same distance.

[0012] Furthermore, a distance b from the first transverse portion to the lower edge of the outer frame and a distance c from the second transverse portion to the lower edge of the outer frame satisfy the relationship b>a>c.

[0013] The beneficial effects of the technical solution of the utility model are:

[0014] 1. Replace the straight connecting bars with complex stepped connecting bars to make the filter structurally stronger without changing the resistance value;

[0015] 2. The support column structure is more stable, the die-casting precision is easy to control, and the processing difficulty is low;

[0016] 3. The gap tolerance requirements of adjacent resonators of the downlink frequency band suppression zero point are met, ensuring the electrical performance of the antenna cavity combiner;

[0017] 4. The resonator post-adjustment test value is stable, the debugging is simple, the debugging time is short, and the debugging cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 An exploded view of an antenna cavity combiner of an embodiment;

[0019] Figure 2 It is a front view of the antenna cavity combiner cavity of the embodiment.

[0020] The numbers in the figure represent:

[0021] 1- cavity, 11- outer frame, 12- filter, 121- support column, 122- resonator, 13- straight connecting rib, 14- stepped connecting rib, 141- first transverse portion, 142- longitudinal portion, 143- second transverse portion;

[0022] 2-Front cover;

[0023] 3-Rear cover. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below in conjunction with specific embodiments.

[0025] Example:

[0026] like Figure 1 and Figure 2 As shown, an inductive coupling structure reinforced antenna cavity combiner of the utility model includes a cavity 1 and a front cover plate 2 and a rear cover plate 3 fixed on both sides of the cavity 1, the cavity 1 includes an integrally formed outer frame 11, a plurality of filters 12 and a plurality of linear connecting ribs 13, the inner side surface of the front cover plate 2, the inner side surface of the rear cover plate 3 and the inner side surface of the outer frame 11 form an inner cavity, each filter 12 includes an independent support column 121 and an independent resonator 122, and the resonator 122 is located on the corresponding support column 121. On the lower side of the outer frame 11, a straight connecting rib 13 connects adjacent support columns 121; at least one straight connecting rib is replaced by a stepped connecting rib 14 with equal resistance value, the stepped connecting rib 14 includes a first transverse portion 141, a longitudinal portion 142 and a second transverse portion 143, the lower end of the longitudinal portion 142 is integrally connected to the lower side of the outer frame 11, the two ends of the first transverse portion 141 are respectively connected to the longitudinal portion 142 and a support column, and the two ends of the second transverse portion 143 are respectively connected to the longitudinal portion 142 and another support column.

[0027] Compared with the adjacent straight connecting ribs 13, the stepped connecting ribs 14 here, although with more materials, form a bridge circuit with the outer frame 11 part between the adjacent support columns 121, which is equivalent to a whole formed by five resistors connected in series and parallel, replacing the parallel circuit formed by the direct connecting ribs 13 and the outer frame 11 part between the adjacent support columns 121. Therefore, under reasonable design, the total resistance value of this bridge circuit can be equal to the resistance value of the parallel circuit. And this stepped connecting rib 14 constitutes a bracket structure with more turns, so it greatly improves the structural strength of the filter 12. Because the structure of the support column 121 is more stable, the die-casting precision is easy to control, and the processing difficulty is low. The electrical performance of the antenna cavity combiner is guaranteed. The test value of the resonator 122 is stable after adjustment, the debugging is simple, the debugging time is short, and the debugging cost is saved.

[0028] like Figure 2As shown, the distance between each linear connecting rib 13 and the lower side of the outer frame 11 is not less than the set distance a, and different linear connecting ribs 13 are not located at the same distance.

[0029] The set distance a depends on the total length of the support column 121. Because the support column 121 is connected to the outer frame 11 below the highest straight connecting rib 13, the structure is stable, and the upper part is suspended, so the suspended length cannot account for too much. Here, the distance a is generally set to about 30% of the length of the support column 121.

[0030] like Figure 2 As shown, a distance b from the first transverse portion 141 to the lower side of the outer frame 11 and a distance c from the second transverse portion 143 to the lower side of the outer frame 11 satisfy the relationship b>a>c.

[0031] Because the distance c from the second transverse portion 143 to the lower side of the outer frame 11 is definitely smaller than the distance between the straight connecting rib 13 and the lower side of the outer frame 11, the heights of the two are staggered. This structure is applicable to the case where the height of the second transverse portion 143 of the downlink frequency band suppression zero point must be lower than the set distance a, but the support column 121 on the other side cannot be suspended for too long, so the connection height of the first transverse portion 141 must still meet the requirement of being longer than the set distance a, thereby ensuring the structural strength of the support column 121.

[0032] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An inductive coupling structure reinforced antenna cavity combiner, comprising a cavity and a front cover and a rear cover fixed on both sides of the cavity, the cavity comprising an integrally formed outer frame, a plurality of filters and a plurality of straight connecting ribs, the inner side surface of the front cover, the inner side surface of the rear cover and the inner side surface of the outer frame enclose an inner cavity, each filter comprises an independent support column and an independent resonator, the resonator is located on the lower side of the outer frame through a corresponding support column, and the straight connecting ribs connect adjacent support columns; characterized in that: At least one straight connecting bar is replaced by a stepped connecting bar with equal resistance value, wherein the stepped connecting bar includes a first transverse portion, a longitudinal portion and a second transverse portion, wherein the lower end of the longitudinal portion is integrally connected to the lower side of the outer frame, the two ends of the first transverse portion are respectively connected to the longitudinal portion and a support column, and the two ends of the second transverse portion are respectively connected to the longitudinal portion and another support column.

2. The inductive coupling structure reinforced antenna cavity combiner according to claim 1, characterized in that: The distance between each linear connecting rib and the lower edge of the outer frame is not less than the set distance a, and different linear connecting ribs are not located at the same distance.

3. The inductively coupled structure-enhanced antenna cavity combiner according to claim 2, characterized in that: A distance b from the first lateral portion to the lower side of the outer frame and a distance c from the second lateral portion to the lower side of the outer frame satisfy the relationship b>a>c.

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