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An X-band four-channel T/R module is designed and fabricated based on SICL(Substrate Integrated Coaxial Line). The module's transmitting channel has high gain and high power and the RF signal is transmitted through SICL to reduce signal leakage. Combined with the method of metal frame, it decreases the crosstalk between the input and output ports of transmitting channel, enhances the signal shielding ability, and reduces the risk of self excitation. Test results show that the dimension of the TR module is $110\text{mm}^{\ast}80\text{mm}^{\ast}10\text{mm}$ , with transmitting power ≥ 35W, receiving gain >35dB, noise figure < 3dB, phase consistency ≤± 15 ° and gain consistency ≤ 1dB.

RF microsystems are the development trend of the miniaturization of electronic devices in the future. As an important means to realize the efficient development of RF microsystems, high precision simulation technology is currently receiving extensive attention. Aiming at the RF microsystem in the Ku frequency band, this paper adopts the hardware-in-the-loop simulation method combining three-dimensional electromagnetic field modeling technology and MMICs cascaded circuit parameter extraction technology to realize the research and verification of the simulation method of the RF microsystem. After physical verification and testing, the simulation results are highly consistent with the test results. In the 6 ∼ 18 GHz frequency band, the simulation accuracy is better than 90%, which can meet the application requirements of high precision simulation of RF microsystems.

As a core part of the power amplifier, the power synthesis unit is concerned to meet the launch requirement of electromagnetic equipment. This paper present two kinds of design methods covering 6 to 18 GHz. One approach is adopt an unequal powder combination with a 1:2 between 2-way powder divider and impedance to realize odd equal power output by high and low impedance circuit matching; an alternate approach is a sector broadband synthesis circuit structure of multi-section to achieve higher power signal transmission through cavity or micro-strip circuit model. It can be seen from the simulation results that for both synthesis circuits, the interpolation loss is less than 0.5 dB and the out-put wave ratio is less than 1.3, which meets the high power synthesis demand of broadband power amplifier.

In order to meet the requirements of electromagnetic countermeasure and radar systems, a miniaturized variable frequency module from 8 to 16GHz is proposed. The module adopts the modular design idea, which is implemented by the vertical overlay assembly of two independent modules, which reduces the plane size. Using multi-layer media substrate combined with bare-chip micro-assembly process, the component size is reduced and circuit integration is improved. In order to realize the requirements of generalization, the module adopts a three-stage mixing scheme, integrates the functions of phase shift, attenuation, pre-selected filtering, and can be powered by a single point from +8 to +20V, making it convenient for use. The measured results show that the compact ultra-wide band down converter meets all the specifications, and can be widely used in various occasions.

A frequency multiplication chip is designed by system-in-package technology. In order to meet the requirements of high integration of components, the chip adopts silicon-based frequency multiplier and high suppression interdigital filter chip technology, and uses three-dimensional stacking and system-in-package technology to achieve small package of components. The test results show that the local fundamental wave and secondary harmonic suppression of the chip are greater than 50dBc, and the signal gain is 15dB, which meets the application requirements.

Sum-difference network is used as an important device for millimeter radar and electronic countermeasures system, this paper proposes a kind of design plan based on 90°coupling bridge and waveguide space transition planar sum-difference network, and utilize ADS & HFSS software to simulate and optimize design model to get a compact sum-difference network design circuit. By means of micro-package technology and wave guide shell processing accuracy control, creates two-way comparator object which dimension is 50mm × 25mm × 15mm, and analyzes the effects of port matching on design. Test result indicates that the two-way sum-difference network has the advantage of easy structure, good port amplitude consistency, low standing waves etc. meets direction finding demand which is based on phased array millimeter radar/ electronic countermeasures system.