Miniaturization Design Of Passive Components Of Phased Array Feed Network

With the space electromagnetic environment becoming more serious and thecontinuous development of communication technology，phased array is appliedmore and more widely in the civil and the military aspect. The feed network, as anecessary part of the radar system, plays an important role in phased-array radarfield. The feed network is complicated, and it can realize many significant functionsin phased-array radar. such as electronic scanning, beamforming, and the side lobelevel control. As the technology demand is higher and higher, the miniaturization offeed network also becomes an important research field. In this paper, microstrippower divider and sum and difference network have been studied respectively. Andthe theory model about the DGS and CRLH TL have been discussing. At the sametime, the technology of DGS and CRLH are employed to miniaturized the feednetwork. The main contents of this paper are as follows:First, this paper researches the basic theory model of the DGS technology andCRLH TL technology, introduces the development of DGS technology and CRLHtechnology, builds and analyzes the basic equivalent circuit, and then discusses theapplication of this two kinds of technology in the miniaturization of power divider.Second, depending on the Wilkinson divider，this paper designs a miniaturizingdivider by the DGS and CRLH TL technology. First of all, a novel DGS structure isdesigned. Its performance is studied with simulation analysis. Then, applied thenovel DGS to the power divider for miniaturization design, the simulation andmachining test results are showed. The test results show that the relative bandwidthis34%, port isolation is more than20dB in bandwidth range, and the size of powerdivider is decreased33%.Similarly, employed the technology of CRLH to minimizepower divider. The test results show that port isolation is greater than20dB and therelative bandwidth is only10%, but the size of power divider is decreased63%.Finally, the sum and difference network is made by two different methods.Considering the actual application and the space, the network is designed by the3dB microstrip bridge and microstrip hybrid ring. Then, the two forms of sum anddifference network all use the DGS technology for the design of miniaturization.The experiment results are basically consistent with the simulation. The relative bandwidth is more than10%, the port isolation is greater than20dB, the phase ofthe sum signal and difference signal all meet the requirements, and the size ofpower divider is decreased25%and30%, respectively.