BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given herein below for illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 is a schematic view of the appearance of an antenna substrate according to the first embodiment of the present invention.
FIG. 2A is a front view of the first surface of the antenna substrate according to the first embodiment of the present invention.
FIG. 2B is a front view of the second surface of the antenna substrate according to the first embodiment of the present invention.
FIG. 2C is a schematic view of the appearance of an antenna substrate according to the second embodiment of the present invention.
FIG. 2D is a front view of the first surface of the antenna substrate according to the third embodiment of the present invention.
FIG. 2E is a front view of the first surface of the antenna substrate according to the fourth embodiment of the present invention.
FIG. 2F is a front view of the first surface of the antenna substrate according to the fifth embodiment of the present invention.
FIG. 2G is a front view of the first surface of the antenna substrate according to the sixth embodiment of the present invention.
FIG. 2H is a front view of the first surface of the antenna substrate according to the seventh embodiment of the present invention.
FIG. 2I is a front view of the first surface of the antenna substrate according to the eighth embodiment of the present invention.
FIG. 3A is an H-polarized radiation pattern of the first frequency band according to the first embodiment of the present invention.
FIG. 3B is an H-polarized radiation pattern of the first frequency band according to the first embodiment of the present invention.
FIG. 3C is an H-polarized radiation pattern of the first frequency band according to the first embodiment of the present invention.
FIG. 3D is an E-polarized radiation pattern of the first frequency band according to the first embodiment of the present invention.
FIG. 3E is an E-polarized radiation pattern of the first frequency band according to the first embodiment of the present invention.
FIG. 3F is an E-polarized radiation pattern of the first frequency band according to the first embodiment of the present invention.
FIG. 4A is an H-polarized radiation pattern of the second frequency band according to the first embodiment of the present invention.
FIG. 4B is an H-polarized radiation pattern of the second frequency band according to the first embodiment of the present invention.
FIG. 4C is an H-polarized radiation pattern of the second frequency band according to the first embodiment of the present invention.
FIG. 4D is an E-polarized radiation pattern of the second frequency band according to the first embodiment of the present invention.
FIG. 4E is an E-polarized radiation pattern of the second frequency band according to the first embodiment of the present invention.
FIG. 4F is an E-polarized radiation pattern of the second frequency band according to the first embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, it is a schematic view of the appearance of an antenna substrate according to a first embodiment of the present invention. The antenna substrate 100 is provided with a diplexer loop portion 10, two single-frequency radiation units 20 and two dual-frequency radiation units 30.
The diplexer loop portion 10 includes two signal feed portions, i.e., a first signal feed portion 10a and a second signal feed portion 10b (as shown in FIG. 2A). The first signal feed portion 10a and the second signal feed portion 10b are respectively connected to a corresponding meandering microstrip line section 10c for providing a signal transmitting path and a signal receiving path, and filtering out a transmitting signal and a receiving signal through a filtering line (not shown).
The two single-frequency radiation units 20 are respectively disposed on two sides of the diplexer loop portion 10 and connected to the diplexer loop portion 10 through a microstrip line for receiving and radiating a feed signal, wherein the single-frequency radiation unit 20 is of a dipole antenna structure.
The two dual-frequency radiation units 30 are connected to the single-frequency radiation units 20 through a microstrip line, for receiving and radiating a feed signal, wherein the dual-frequency radiation unit 30 is of a dipole antenna structure.
Furthermore, the antenna feeds a signal by means of central feed characterized in a symmetrical radiation pattern and relatively reduces the feed loss, so as to enhance the receiving/sending gains of the antenna. In addition, the single-frequency radiation unit 20 and the dual-frequency radiation unit 30 are connected in series and the receiving/sending gains can be regulated by altering the quantity of the seriesly-connected single-frequency radiation units 20 or dual-frequency radiation units 30.
Referring to FIG. 2A, it is a front view of the first surface of the antenna substrate according to the first embodiment of the present invention. The first surface 101 of the antenna substrate 100 is provided with the first signal feed portion 10a, the second signal feed portion 10b, the meandering microstrip line section 10c, a single-frequency radiation signal portion 21 and a dual-frequency radiation signal portion 31.
The first signal feed portion 10a and the second signal feed portion 10b are respectively connected to the corresponding meandering circuit section 10c for providing a signal transmitting path and a signal receiving path and filtering out a transmitting signal and a receiving signal through a filtering line (not shown). The two side edges of the meandering circuit section 10c of the diplexer loop portion 10 are respectively connected to a single-frequency radiation signal portion 21.
The single-frequency radiation signal portions 21 are respectively disposed on two sides of the diplexer loop portion 10 and connected to the diplexer loop portion 10 through a microstrip line 11 for receiving and radiating a feed signal. In addition, each single-frequency radiation signal portion 21 includes a first frequency band radiation signal portion 21a for radiating a radio-frequency signal of the first frequency value (for example, 5 GHz).
The dual-frequency radiation signal portions 31 are connected to the single-frequency radiation portions 20 through the microstrip line 11 for receiving and radiating a feed signal. Each dual-frequency radiation signal portion 31 includes a first frequency band radiation signal portion 31a and a second frequency band radiation signal portion 31b respectively for radiating radio-frequency signals of the first frequency value (for example, 5 GHz) and the second frequency value (for example, 2.4 GHz).
Referring to FIG. 2B, it is a front view of the second surface of the antenna substrate according to the first embodiment of the present invention. The second surface 102 of the antenna substrate 100 is a ground-plane line with a line pattern corresponding to the shape of the first surface 101, which includes a diplexer loop ground portion 10d, single-frequency radiation ground portions 22 and dual-frequency radiation ground portions 32.
The diplexer loop ground portion 10d has an approximately rectangular-shaped ground plane including two ground feed points respectively corresponding to the positions of the first signal feed portion 10a and the second signal feed portion 10b, for providing a ground loop of radio-frequency signals.
The single-frequency radiation ground portions 22 are respectively disposed on two sides of the diplexer loop ground portion 10d and connected to the diplexer loop ground portion 10d through the microstrip line 11. In addition, each single-frequency radiation ground portion 22 includes a first frequency band radiation ground portion 22a which is symmetrical with the first frequency band radiation signal portion 21a.
The dual-frequency ground portions 32 are connected to the single-frequency ground portions 22 through the microstrip line 11. Each dual-frequency ground portion 32 includes a first frequency band radiation ground portion 32a and a second frequency band radiation ground portion 32b respectively corresponding to the first frequency band radiation signal portion 31a and the second frequency band radiation signal portion 31b. Moreover, the first frequency band radiation signal portion 31a and the first frequency band ground portion 32a together form a first frequency band radiation portion, and the second frequency band radiation signal portion 31b and the second frequency band ground portion 32b together form a second frequency band radiation portion.
Referring to FIG. 2C, it is a front view of the appearance of the antenna substrate according to a second embodiment of the present invention. The antenna substrate 100 is provided with a diplexer loop portion 10 and two dual-frequency radiation portions 30.
The diplexer loop portion 10 includes two signal feed portions, i.e., a first signal feed portion 10a and a second signal feed portion 10b, wherein the first signal feed portion 10a and the second signal feed portion 10b are respectively connected to a corresponding meandering microstrip line section 10c for providing a signal transmitting path and a signal receiving path, and filtering out a transmitting signal and a receiving signal through a filtering line (not shown).
The dual-frequency radiation units 30 are connected to the diplexer loop portion 10 through the microstrip line for receiving and radiating a feed signal. Each dual-frequency radiation unit 30 includes a first frequency band radiation portion 30a and a second frequency band radiation portion 30b respectively for radiating radio-frequency signals of the first frequency value (for example, 2.4 GHz) and the second frequency value (for example, 5 GHz).
Furthermore, the signal receiving/sending characteristics of the antenna can be modified by altering the quantity of the radiation units. Referring to FIG. 2D, it is a front view of the first surface of the antenna substrate according to a third embodiment of the present invention, which has a diplexer loop portion 10 connected to four dual-frequency radiation units 31, but a part of the structure is the same as that in the first embodiment, and the details will not be described herein again. Referring to FIG. 2E, it is a front view of the first surface of the antenna substrate according to a fourth embodiment of the present invention, which has a signal feed portion 11a disposed at the center of the antenna substrate 100, and connected to four dual-frequency radiation units 31 through a microstrip line 11, but a part of the structure is the same as that in the first embodiment, and the details will not be described herein again. Referring to FIG. 2F, it is a front view of the first surface of the antenna substrate according to a fifth embodiment of the present invention, which has a signal feed portion 11a disposed at the center of the antenna substrate 100, and connected to two single-frequency radiation units 21 and two dual-frequency radiation units 31 through a microstrip line 11, but a part of the structure is the same as that in the first embodiment, and the details will not be described herein again. Referring to FIG. 2C; it is a front view of the first surface of the antenna substrate according to a sixth embodiment of the present invention, which has a signal feed portion 11a disposed at the center of the antenna substrate 100, and connected to two dual-frequency radiation units 31 through a microstrip line 11, but a part of the structure is the same as that in the second embodiment, and the details will not be described herein again. Referring to FIG. 2H, it is a front view of the first surface of the antenna substrate according to a seventh embodiment of the present invention, which has a signal feed portion 11a disposed at the center of the antenna substrate 100, and connected to two single-frequency radiation units 21 through a microstrip line 11, but a part of the structure is the same as that in the second embodiment, and the details will not be described herein again. Referring to FIG. 2I, it is a front view of the first surface of the antenna substrate according to an eighth embodiment of the present invention, which has a signal feed portion 11a disposed at the center of the antenna substrate 100, and connected to two single-frequency radiation units 21 through a microstrip line 11, but a part of the structure is the same as that in the second embodiment, and the details will not be described herein again.
Referring to FIGS. 3A to 3C, they are H-polarized radiation patterns according to the first embodiment of the present invention, respectively taking frequencies 2.4 GHz, 2.45 GHz and 2.5 GHz in the first frequency band for different tests. Referring to FIGS. 3D to 3F, they are E-polarized radiation patterns according to the first embodiment of the present invention, respectively taking frequencies 2.4 GHz, 2.45 GHz and 2.5 GHz in the first frequency band for different tests. Referring to FIGS. 4A to 4C, they are H-polarized radiation patterns according to the first embodiment of the present invention, respectively taking frequencies 4.9 GHz, 5.5 GHz and 5.9 GHz in the second frequency band for different tests. Referring to FIGS. 4D to 4F, they are V-polarized radiation patterns according to the first embodiment of the present invention, respectively taking frequencies 4.9 GHz, 5.5 GHz and 5.9 GHz in the second frequency band for different tests.
With the dual-frequency high-gain antenna, a radio-frequency signal is transmitted and received through the diplexer loop portion, so as to provide the antenna with the characteristics of receiving/sending a signal, and the design of a single-frequency radiation section and a dual-frequency radiation section also enhances the signal receiving/sending gains of the antenna.
The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
Patent Application
20080074340
