Low-loss microstrip patch frequency scanning antenna array capable of scanning by large angle in limited bandwidth

Abstract

The invention discloses a low-loss microstrip patch frequency scanning antenna array capable of scanning by a large angle in a limited bandwidth. The low-loss microstrip patch frequency scanning antenna array comprises an E-plane bend waveguide, a metal floor, a medium base plate, a waveguide gap microstrip patch mixed feeding structure and microstrip patch units, wherein one end of the E-plane bend waveguide is provided with a feeding port, and the other end of the E-plane bend waveguide is provided with a waveguide port which is connected with matched load; the metal floor is arranged on the E-plane bend waveguide; rectangular gaps are formed on the metal floor; the medium base plate is arranged on the metal floor; two rows of the microstrip patch units are arranged on the medium base plate; the number of each row of the microstrip patch units is as same as that of the gaps; all the microstrip patch units form the microstrip patch antenna array; a coupling microstrip patch is arranged on the medium base plate corresponding to each gap, on the medium base plate; microstrip transmission lines are symmetrically connected with the two sides of each coupling microstrip patch respectively; and the ports of the microstrip transmission lines are connected with the corresponding microstrip patch units respectively. The low-loss microstrip patch frequency scanning antenna array has the advantages of obviously reducing the loss of a frequency scanning slow wave line and improving the performance of the frequency scanning antenna.

Description

technical field [0001] The invention belongs to a frequency-scanning antenna array, in particular to a low-loss microstrip patch frequency-scanning antenna array for large-angle scanning within a limited bandwidth. Background technique [0002] Electronic scanning antenna overcomes the shortcomings of slow scanning speed in traditional mechanical scanning, and has been widely used in military and civilian fields such as radar, communication, and mobile TV, and has developed rapidly. There are four main types of antenna electronic scanning techniques: phase scanning, frequency scanning, time delay scanning and electronic feed switch scanning. Among them, phase sweep and frequency sweep are the most used. Phase scanning is to realize beam scanning by changing the phase of the input signal of the array elements; frequency scanning is to change the "intra-array phase difference" between antenna elements by changing the signal frequency, so as to realize beam scanning. In addit...

AI Technical Summary

Problems solved by technology

But their volume and weight are relatively large, and the profile is relatively high, thus limiting their application range

Since the end of the 1970s, microstrip antenna arrays with beam scanning capabilities have been proposed one after another, which are mainly divided into two categories. One is to use the leaky wave mode for frequency scanning. The leaky wave antenna has a simple structure and high efficiency, but the scanning angle It is limited and cannot achieve wide-angle scanning; the other is to use microstrip slow wave lines for scanning, but the loss of microstrip lines is large, which limits the performance of the antenna

The narrower the bandwidth, the longer the slow wave line used to achieve large-angle scanning, and the corresponding loss will increase

The traditional waveguide slow wave line loss is relatively low, but the frequency scanning array formed by it usually has the disadvantages of large volume and heavy weight

If the waveguide slow wave line is not used, it will face the disadvantages of complex structure and large loss, such as microstrip slow wave line

Due to the existence of dielectric loss, metal loss and radiation loss, the energy consumed on the microstrip slow wave line is huge

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