Satellite antenna device

A satellite antenna device is provided. The satellite antenna device includes a body, a wave guide, and a dielectric member. The wave guide is connected to the body. The dielectric member is connected to the wave guide, wherein the dielectric member comprises a first portion and a second portion, the first portion has a protruding structure, the protruding structure is formed surrounding a central axis of the wave guide, the second portion has a concave structure, and the concave structure corresponds to the protruding structure, and is matched therewith.

CROSS REFERENCE TO RELATED APPLICATIONS

This Application claims priority of Taiwan Patent Application No. 98119676, filed on Jun. 12, 2009, the entirety of which is incorporated by reference herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a satellite antenna device, and in particular relates to a satellite antenna device for receiving satellite signals.

2. Description of the Related Art

FIG. 1ais a perspective view of a conventional satellite antenna device1, andFIG. 1bis an exploded view of the conventional satellite antenna device1. With reference toFIG. 1b, the conventional satellite antenna device1includes a body10, a wave guide20and a dielectric member30. The wave guide20is connected to the body10. The dielectric member30is connected to the wave guide20.

FIG. 1cis a cross-sectional view of conventional wave guide20and dielectric member30. A conventional dielectric member30comprises a radiator body31and a waterproof cover32. The waterproof cove32wedges an end of the wave guide20. The radiator body31is received in the waterproof cover32and the wave guide20. The radiator body31is formed by injection molding. However, air trap33is often formed in the radiator body31, and deteriorates the performance of the dielectric member30.

BRIEF SUMMARY OF THE INVENTION

A satellite antenna device is provided. The satellite antenna device includes a body, a wave guide, and a dielectric member. The wave guide is connected to the body. The dielectric member is connected to the wave guide, wherein the dielectric member comprises a first portion and a second portion, the first portion has a protruding structure, the protruding structure is formed surrounding a central axis of the wave guide, the second portion has a concave structure, and the concave structure corresponds to the protruding structure, and is matched therewith.

In the embodiment of the invention, the protruding structure matches the concave structure. Therefore, the material thickness of each portions of the dielectric member is substantially the same during injection molding. Accordingly the substantially same material thickness of each portion of the dielectric member prevents air trap from forming, and the performance of the dielectric member is improved.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 2ashows a satellite antenna device100of a first embodiment of the invention, including a body110, a wave guide120and a dielectric member130. The wave guide120is connected to the body110. The dielectric member130is connected to the wave guide120.

FIG. 2bis a cross-sectional view of the dielectric member130and the wave guide120. With reference toFIGS. 2aand2b, the dielectric member130is substantially a pillar, including a first portion131and a second portion132. The first portion131has a first protruding structure133. The first protruding structure133is formed surrounding a central axis101of the wave guide120. The second portion132has a concave structure134. The concave structure134corresponds to the protruding structure133, and is matched therewith.

In this embodiment, the protruding structure133includes a pillar1331and an annular structure1332. The pillar1331is located on the central axis101. The annular structure1332surrounds the pillar1331.

In the embodiment of the invention, the protruding structure133matches the concave structure134. Therefore, the material thickness of each portion of the dielectric member130is substantially the same during injection molding. Accordingly the substantially same material thickness of each portion of the dielectric member130prevents air trap from forming, and the performance of the dielectric member130is improved.

With reference toFIG. 2b, gaps135are formed between a front end of the second portion132and the first portion131. When the gaps135are formed symmetric to the central axis101, the performance of the dielectric member is not influenced. In other embodiment, the gaps135are infilled by sealant material.

The first portion131further includes a first wedging structure136, and the first wedging structure136is formed on an inner wall of the first portion131. The wave guide120further includes a second wedging structure121, and the second wedging structure121is formed on an end of the wave guide120. The first wedging structure136wedges the second wedging structure121. In this embodiment, the dielectric member130does not need an additional waterproof cover to repel water.

With reference toFIG. 2a, the first portion131further has positioning structures137, the wave guide120further has positioning structures122, the positioning structures137match the positioning structures122to prevent the dielectric member130from being twisted relative to the wave guide120and separated therefrom.

FIGS. 3aand3bshow a satellite antenna device100′ of a second embodiment of the invention, including a body110, a wave guide120and a dielectric member130′. The wave guide120is connected to the body110. The dielectric member130′ is connected to the wave guide120.

The dielectric member130′ is substantially a pillar, including a first portion131′, a second portion132′ and a cover133′. The first portion131′ has a first protruding structure. The first protruding structure is formed surrounding a central axis101of the wave guide120. The second portion132′ has a concave structure. The concave structure corresponds to the protruding structure, and is matched therewith. The first portion131′ and the second portion132′ are received in the cover133′. The cover133′ has a first wedging structure134′, and the first wedging structure134′ is formed on an inner wall of the cover133′. The wave guide120further includes a second wedging structure121, and the second wedging structure121is formed on an end of the wave guide120. The first wedging structure134′ wedges the second wedging structure121.

FIG. 4ashows a detailed structure of the first portion131′ and the second portion132′, wherein a protruding structure140of the first portion131′ has a first annular structure141and a second annular structure142, the first annular structure141and the second annular structure142surround the central axis101, and the second annular structure142is located between the first annular structure141and a central axis101. The protruding structure140of the first portion131′ matches the concave structure150of the second portion132′. The cross-sections of the first annular structure141and the second annular structure142are circular.

FIG. 4bis a side view of the dielectric member130′, andFIG. 4cis a cross-sectional view of the dielectric member130′.

FIG. 5ashows a dielectric member210of a modified example of the second embodiment of the invention. Compared with the second embodiment, the cross-sections of the first annular structure211and the second annular structure212of the dielectric member210are rectangular.FIG. 5bis a cross-sectional view of the dielectric member ofFIG. 5a.

In the embodiments of the invention, the design of the dielectric member can be modified, and several examples are shown as follows.

FIGS. 6aand6bshow a dielectric member220of a third embodiment of the invention.FIG. 6bis a cross-sectional view of the dielectric member ofFIG. 6a. In this embodiment the protruding structure of the dielectric member220includes a plurality of ribs221. The ribs221surround the central axis101, and extend in radial directions from the central axis101. A plurality of slots are formed on a side wall of the protruding structure.

FIGS. 7aand7bshow a dielectric member230of a fourth embodiment of the invention.FIG. 7bis a cross-sectional view of the dielectric member ofFIG. 7a. In this embodiment, a first portion231, a second portion232and a third portion233is included in the dielectric member230. The first portion231is sandwiched between the second portion232and the third portion233. A protruding structure is formed on the first portion231, and concave structures are formed on the second portion232and the third portion233. The protruding structure has a first disk234and a second disk235. The central axis101passes through the center of the first disk234and the second disk235, and the first disk234and the second disk235are aligned along the central axis.

FIGS. 8aand8bshow a dielectric member240of a fifth embodiment of the invention.FIG. 8bis a cross-sectional view of the dielectric member ofFIG. 8a. In this embodiment, the protruding structure (241) of the dielectric member240is formed symmetric to a central plane (first plane)102of the wave guide. The protruding structure (241) has a plurality of planner structures241, and the planner structures241are parallel to the central plane102, and are arranged symmetric to the central plane102.

FIGS. 9aand9bshow a dielectric member250of a sixth embodiment of the invention.FIG. 9bis a cross-sectional view of the dielectric member ofFIG. 9a. In this embodiment, the protruding structure (251) of the dielectric member250is formed symmetric to a central plane102of the wave guide. The protruding structure (251) has a plurality of pillars251, and the pillars251are parallel to the central plane102, and are arranged in matrix symmetric to the central plane102.

FIGS. 10a,10band10cshow a dielectric member260of a seventh embodiment of the invention.FIG. 10ais an exploded view of the seventh embodiment,FIG. 10bis a side view of the seventh embodiment, andFIG. 10cis a front view of the seventh embodiment of the invention. The dielectric member260is substantially a pillar, having a first portion261and a second portion262, the first portion261is located on a central axis101of the wave guide, and the second portion262is telescoped on the first portion261. In this embodiment, the dielectric member is formed by a plurality of telescoping annular structures.