This non-provisional application claims priority under 35 U.S.C. ยง119(a) on Patent Application No(s). 098209508 filed in Taiwan, R.O.C. on May 27, 2009, the entire contents of which are hereby incorporated by reference.
1. Field of Invention
The present invention relates to an antenna module, and more particularly to a high-gain omnidirectional antenna module.
2. Related Art
The telematic system is a technology that integrates information, communication, and electronics, in which antenna is an indispensable element. The antenna used in the telematic system must support the mobility of vehicles. As a directional antenna can transmit signals in only a fixed direction, when the position of the directional antenna is changed, the communication link established by the directional antenna is interrupted. Therefore, the telematic system uses an omnidirectional antenna. Thus, regardless of the direction in which the vehicle moves, the communication link established by the omnidirectional antenna can be maintained continuously, such that the information can be transmitted without interruption.
However, the antenna gain of the omnidirectional antenna in the prior art is low. In order to increase the transmission distance, a high-gain antenna is required. If the antenna gain is increased, the size of the antenna needs to be increased accordingly. However, in consideration of safe driving or appearance of the vehicle, the large-sized antenna is not suitable for being installed on a vehicle. Therefore, it is an important issue for researchers to design a high-gain antenna with a size suitable for being installed on a vehicle.
Accordingly, the present invention is a high-gain omnidirectional antenna module, which is capable of performing long-distance transmission. The high-gain omnidirectional antenna module has the characteristic of small size, and is suitable for being installed in a vehicle.
The high-gain omnidirectional antenna module of the present invention comprises a base, a radio frequency (RF) power amplifier, an omnidirectional antenna, a first signal line, and a second signal line. The base has a first surface and a second surface. The first signal line delivers a signal fed from outside to an input port of the RF power amplifier, and the second signal line connects an output port of the RF power amplifier and a feed portion of the antenna.
In an embodiment of the present invention, the RF power amplifier is disposed on a circuit board. The antenna module further comprises a case for supporting the omnidirectional antenna on the circuit board. The antenna module further comprises a plurality of support members, disposed between the circuit board and the first surface of the base. The material of the support members is preferably metal. The antenna module further comprises a cushion, disposed between the omnidirectional antenna and the case. The antenna module further comprises a housing. The first surface of the base comprises a groove, for fixing the housing on the base. The antenna module further comprises a waterproof joint disposed on the second surface. A frequency operating range of the RF power amplifier is between 2.4 GHz and 2.5 GHz.
The signal is amplified by the RF power amplifier, such that the gain of the omnidirectional antenna is increased significantly. Therefore, the high-gain omnidirectional antenna effectively increases the transmission distance without increasing the size of the omnidirectional antenna.
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:
The detailed features and advantages of the present invention are described below in great detail through the following embodiments, and the content of the detailed description is sufficient for those skilled in the art to understand the technical content of the present invention and to implement the present invention there accordingly. Based upon the content of the specification, the claims, and the drawings, those skilled in the art can easily understand the relevant objectives and advantages of the present invention. The following embodiments are intended to describe the present invention in further detail, but not intended to limit the scope of the present invention in any way.
In an embodiment of the present invention, the antenna module further comprises a circuit board 110. The RF power amplifier (not shown) is disposed on the circuit board 110. The RF power amplifier (not shown) uses an active device to amplify an RF signal, and is disposed on the circuit board 110 as metal circuit wiring. The circuit board 110 has a case 113 disposed thereon, for supporting the omnidirectional antenna 14 on the circuit board 110. The frequency operating range of the RF power amplifier (not shown) is 2.4 GHz-2.5 GHz. The RF power amplifier (not shown) may be a power amplifier of TM-5004 model or other power amplifiers having the same property.
In an embodiment of the present invention, the high-gain omnidirectional antenna further comprises a plurality of support members 16, for supporting the circuit board 110 on the first surface 101 of the base. The material of the support members 16 is preferably metal. The antenna module further comprises a cushion 17, for supporting the omnidirectional antenna 14 on the case 113. As the antenna module is disposed outside a vehicle, in order to prevent rain or sand from damaging the electronic elements in the antenna module, the antenna module further comprises a housing 18. The first surface of the base has a groove 103 for fastening the housing on the base 10.
By amplifying the RF signal with an active device (not shown) in the RF power amplifier, the gain of the omnidirectional antenna 14 is increased. Therefore, without increasing the size of the omnidirectional antenna, the high-gain omnidirectional antenna module effectively increases the transmission distance. Furthermore, as the module has the housing 18 and the base 10, the electronic elements may be covered in the housing 18 and the base 10. When the antenna module is disposed outside the vehicle in use, the electronic elements will not easily be damaged by sand or rain from outside. Therefore, the high-gain omnidirectional antenna module has a small size and good durability, and is suitable for being installed on a vehicle to serve as a wireless signal transceiver for the telematic system.
Number | Date | Country | Kind |
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098209508 | May 2009 | TW | national |