Microstrip patch antenna with adjustable frequency

Abstract

The invention belongs to the field of a microwave device, and specifically relates to a microstrip patch antenna with adjustable frequency. The microstrip patch antenna comprises a radiation patch, a dielectric plate, a feed port and an excitation source port, wherein the radiation patch is arranged on the upper surface of the dielectric plate; the excitation source port is connected with the feed port for excitation; an even number of patch small holes with the same dimensions are symmetrically formed in the opposite edges of the radiation patch; the patch small holes are in array arrangement, and the center of the array is positioned on the midline of the corresponding opposite edges; and each patch small hole is rectangular. By setting the patch small holes in the radiation patch, the antenna bandwidth can be expanded; and meanwhile, when the processed microstrip patch antenna has frequency deviation proved by a test, the radiation patch can be cut conveniently along the patch small holes so as to effectively correct the frequency deviation of the microstrip patch antenna.

Description

technical field [0001] The invention belongs to the field of microwave devices, in particular to a frequency-tunable microstrip patch antenna. Background technique [0002] With the development of science and technology, the miniaturization of devices has become the most important technical point in practical research and application. The microstrip antenna can work at 100MHz-100GHz. The advantages of using a dielectric plate as a radiation unit and simple design make it widely used in modern microwave transceivers. The system field is an indispensable part of today's microwave devices. Microstrip antennas have the following advantages: 1. Small size, light weight, low profile, and conformal to carriers such as aircraft and mobile communication terminals; 2. Low manufacturing cost, easy to mass produce, and linear polarization and Circular polarization; 3, small scattering cross-section, easy to make dual-frequency, dual-polarized antennas; 4, can be easily integrated with ...

AI Technical Summary

Problems solved by technology

However, it also has practical application defects, the most important of which is that there will be certain errors between the processed physical test results and the theoretical results of the software simulation; the reason for these errors is: the design of the microstrip antenna is to use the plate as the radiation unit, Usually, due to the processing and production of the plates we actually use, the production of different batches of the same model will lead to changes in the dielectric constant, loss tangent, thickness, etc. of the plates themselves, and we set these indicators of the plates during software simulation They are all set according to the ideal situation, which leads to a certain error between the processed physical test results and the theoretical results of the software simulation.

Among these errors, the most deadly is the frequency offset. The size of the frequency is related to the length and width of the patch on the dielectric board. The frequency offset is divided into high and low. According to microwave theory, if it is low , then it is only necessary to reduce the size. At this time, the length and width of the microstrip antenna can be cut in equal proportions by physical methods, and the frequency of the antenna can be changed to high frequencies; but if the processed antenna frequency is too high, In order to reduce the frequency, we need to increase the size, and the length of the processed antenna patch has been processed according to the simulated size, which cannot be increased. This will directly affect the actual engineering process and require redesign and processing, causing great harm to actual research and application. troubled

Images