1. Field of the Invention
The invention is related to a miniaturized microstrip antenna, more particularly to provide the microstrip antenna with a significantly lower resonant frequency.
2. The Prior Arts
The prior art of the microstrip antenna is formed by paving metal lines on a dielectric board to receive or transmit signal at a specific frequency band, and usually fabricated by the simple arrangements of strip-shaped transmission lines; the prior art also applies the transmission line theory to implement the design of the microstrip antenna. The operation frequency of a traditional microstrip antenna is determined by the size of the antenna; although increasing the dielectric coefficient of the dielectric board can reduce the area of the antenna significantly, it also greatly reduces the gain and bandwidth of the antenna; moreover, the cost for a high-dielectric coefficient material is usually higher than others too. In addition, carving grooves on the microstrip antenna can change the current flow path, which lengthens the current path when resonance, and thus reduces the area of antenna. Also, inserting a metal plate or a metal pin into an end of antenna, or cutting a microstrip antenna into two halves and then connect them with an inductance element, can both reduce the area of antenna, but all of these fabrication methods will increase the manufacturing complexity and cost for the microstrip antenna. Therefore, this invention is developed to solve the problems of the traditional microstrip antenna mentioned above.
This invention is related to a kind of miniaturized microstrip antenna, which actually removes one or more above-mentioned limitations or drawbacks of the related arts.
The main object of the miniaturized microstrip antenna of this invention is to provide a microstrip antenna which has longer electric length for current so as to shrink the size of microstrip antenna.
Another object of the miniaturized microstrip antenna of this invention is to try metallic patterns with various geometric grids or zigzags to obtain the optimum parameters on the microstrip antenna design.
One more object of the miniaturized microstrip antenna of this invention is to provide a feeding element to work with the microstrip antenna to output and input the antenna signal efficiently.
One more object of the miniaturized microstrip antenna of this invention is to provide an easy fabrication and a low-cost manufacturing for the microstrip antenna by using the simple geometric shapes on the microstrip antenna.
To achieve the aforementioned objects, the invention is related to a miniaturized microstrip antenna, which comprises: an antenna element made by paving a first wire pattern on the surface of a first dielectric layer, wherein the first wire pattern is a metal circuit for receiving and transmitting specific signals; and a feeding element to work with the antenna element for feeding specific signals to the antenna element to transmit, or capturing signals received by the antenna element; wherein the first wire pattern is the layout circuit which consists of a plurality of horizontal wires and vertical wires, and the geometric size defined by the first metal pattern determines the specific frequency band to be received or transmitted.
The objects and the functions of this invention can be further explained by referring the drawings below.
Please refer the attached drawings for further explanation on the preferred embodiments of the invention in the following. Some scales are exaggerated compared to others to provide clearer descriptions, which will thus help the reader to understand the invention.
Referring
The above-mentioned antenna element (10) working together with the feeding element (20) can receive and transmit signals. The feeding element (20) made by paving a second wire pattern (22) on the top and paving a third wire pattern (23) on the bottom of a second dielectric layer (21). The second dielectric layer (21) is a board made of FR4, Teflon, Duriod, fiberglass, aluminum oxide, ceramics or other dielectric materials. The second wire pattern (22) and the third wire pattern (23) are the wire circuits paved on the top and on the bottom of the second dielectric layer (21), respectively.
Every geometrical parameter of the above-mentioned antenna element (10) with the feeding element (20) in the miniaturized microstrip antenna of the invention including L, W, S, T, Lg, Wg, Lh, Wh, Lc and Wc can be optimized by numerical analysis method or simulation program. Furthermore, the relative locations of the hollow portion (22a) with respect to the first wire pattern (12), the second wire pattern (22), and the third wire pattern (23) are also the parameters to be adjusted for the invention.
The above mentioned is only to describe the preferred embodiments of the invention, which does not intend to limit the invention in any aspect; therefore, any ornament or modification with the spirit of the invention should be still within the scope of the protection claimed by the invention.