High reliability is essential for spaceborne antenna, however PCB feeder and solder joint are usually lacking of guarantee in reliability. Therefore, a integrative and solderless design of cable, balun and spital is proposed using improved balun, intensifying the cooperative design idea of electricity, structure and technology. As a example, a UWB conical spiral antenna is designed. The simulated results show that the antenna achieves a wide-angle coverage with high gain and low axial ratio, as same as high front-to-back ratios.

In this study, we propose an approach to design large depth of field (DOF) millimeter wave (MMW) lens antenna based on Bessel beam. The Bessel beam is generated by using axicon. And the MMW dielectric lens antenna based on Bessel beam or Gaussian beam are designed respectively to satisfy the requirement of imaging. Further, the simulation experiment and analysis are conducted in the 3mm band. The results of simulation indicate that the 3dB beam-width is 3.23mm and the achievable DOF is around 228mm.Compared with the traditional MMW dielectric lens antenna based on Gaussian beam, the achievable DOF can be improved more than five times by MMW dielectric lens antenna based on Bessel beam.

The next generation communication base station antennas represented by the phased array antennas are developing towards high frequency, high gain, high density and high pointing accuracy. The influence of mechanical structure factors on the channel quality of communication system is becoming more and more obvious, and the electromechanical coupling problem is becoming increasingly prominent. In order to ensure the realization of 5G/6G communication capacity in complex working environment, the electromechanical coupling model of channel capacity was established in terms of the electromechanical-thermal coupling problem of the communication base station phased array antenna. Several factors such as the positional shift, deflection of the antenna element and temperature distributions were considered in this model, which can be used to assess the degradation of communication indicators in the heating environment of RF devices. A sensitivity model of the array antenna's electric field strength and channel capacity to the random position error of the antenna element was constructed, and the effect of random position error of each antenna element on the communication indicators under different working conditions was analyzed.s

In the electromagnetic compatibility analysis and signal integrity analysis, it is difficult to do full-wave electromagnetic simulation of system-in-package (SiP) due to its complex, multi-scale and multi-material characteristics. Here, we present a high-performance program JEMS-CDS developed on parallel infrastructure JAUMIN and its high-efficiency algorithms in SiP electromagnetic simulations. A positive definite matrix is constructed by analyzing the FEM matrix built for SiP simulation. Numerical results show that better convergence performance than traditional ones can be achieved, as well as a high parallel efficiency when scaling to hundreds of CPU cores with nearly one hundred millions unknowns. Finally, a practical product is simulated to acquire the high-resolution distribution of electromagnetic, supporting the analysis of electromagnetic compatibility and signal integrity.

As a super-low frequency communication technology, mechanical antenna is a new research field attracting international attention. It has a wide application prospect in long-distance communication and underwater communication. In order to realize the miniaturization and low power consumption of the super-low frequency mechanical antenna, the structure and communication model of the rotating dipole type mechanical antenna are proposed. In view of the proposed communication topology and the radiation intensity of communication signals, a three-axis orthogonal coil is developed as a signal receiving unit. A sensitivity normalized characterization method based on the ratio of thermal noise voltage to induced voltage is proposed. The sensitivity and working condition of the developed coil are tested. The experimental results show that the sensitivity theoretical model can be used in the design of high sensitivity coils and the hollow coil developed can be used in the reception of mechanical antenna signals. The presence of iron products affects the receiving performance of coils. The experimental study provides a theoretical reference for the optimal design of the receiving coil of super-low frequency mechanical antenna.

The multi-antenna eavesdropper scenario based on a mixed-precision analog-to-digital converter massive MIMO (Multiple Input Multiple Output) relay system is studied, where the relay amplifies and forwards the received signal. Using maximum ratio to combine the received signals at the base station, the expressions of spectral efficiency of legitimate users and eavesdroppers are derived, and the expression of secrecy spectral efficiency of the system is obtained. Based on the definition of energy efficiency, a power consumption model is established. The expression of secrecy energy efficiency is derived. And the tradeoff between the secrecy spectral efficiency and the secrecy energy efficiency is analyzed. It further reveals the influence of parameters such as the number of base station antennas and the number of ADC (Analog-to-Digital Converter) quantization bits on the physical layer security performance. The simulation results show that as the number of eavesdropper antennas increases and eavesdropping energy increases, the secrecy spectral efficiency will decrease. When the number of ADC quantization bits is 4, it can also obtain a higher secrecy energy efficiency, while ensuring the secrecy spectral efficiency.