| The T/R component,which determines the realization of various functions and indicators in the phased array radar,occupies an important position in the array radar and is closely related to the high-performance implementation of the millimeter-wave phased array radar.This paper starts with the key technologies of T/R components.Based on the hybrid microwave multilayer board technology and multi-chip assembly technology(MCM),this paper uses microwave monolithic integrated circuit(MMIC)for circuit design to complete the miniaturization of the 16-channel Ku-band.Design of phased array T/R module.The main research contents are as follows:First of all,this paper investigates the domestic and foreign developments of miniaturized phased array T/R modules,and introduces transmission line theory,multilayer board technology and process implementation methods.At the same time,the paper introduces the traditional structure of common phased array T/R modules and puts forward the system's index requirements.Then,the system is designed according to the requirements of the index,including the detailed design of the public branch,the transmitting branch and the receiving branch.At the same time,Advanced Design System is used to perform the link simulation of the receiving and transmitting channels.Secondly,the paper completes the chip selection of the active chips involved in the Ku-band 16-phase miniaturized phased array T/R components,followed by the design of passive circuits,mainly including the selection of multilayer boards and RF microwave stacks,the design of the layer structure,the vertical structure in the multilayer board and the simulation design of the waveguide-microstrip transition structure,the optimization design of the stripline power divider and the microstrip power divider.Among them,The wave performance is better than 1.1.The microstrip power divider adopts a cascade of multiple two-way power dividers to achieve a sixteen-divided microstrip power divider.When the working frequency range is 15.5GH?16.5GHz,the return loss of the input port is greater than19.5d B while the return loss of the output port is greater than 21 d B.The insertion loss is less than 13.2d B and the isolation between the input and output ports is greater than 20 d B.After processing tests,the results prove that the design is feasible.Finally,the Ku-band sixteen-unit miniaturized phased array T/R components are arranged in a three-dimensional circuit structure and the planar circuits of the sixteen transmit-receive channels are designed.The control circuits and electrical signals are embedded in the baseband system.The hybrid microwave multilayer board technology is used to realize the sixteen stacked circuit structure,which improves the integration degree of the entire sixteen joint T/R modules and the thickness of the board is only 1.6mm.In addition,the baseband board is used as the ground of the microwave circuit and a single-point grounding method is used to improve the reliability of the module.Through the cavity design,especially the design of the sixteen transmit-receive channel compartments,the resonance points and ten are effectively avoided.Signal crosstalk between six transmit and receive channels.This design realizes the integrated design of the 16-unit miniaturized phased array T/R module of15.5GHz?16.5GHz.The final overall size is 158.15mm×105mm×20mm.After processing and testing,the gain of the receiving channel reaches more than 18 d B(of which the line loss is about 1d B),the input 1d B compression point is-27 d Bm,the transmit saturation output power is greater than 33 d Bm,the phase characteristics and the control accuracy of the receiving and transmitting directions meet the requirements. |
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