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This paper focuses on the communication effectiveness (CE) of VHF frequency-hopping (FH) radio when threatened by the barrage jamming (BJ) in actual environment. First, a FH radio simulation model is built on the Simulink platform based on VHF FH radio's operating principle. Then, the jamming signals are quantified classified by their threat level and simulations of jamming signal from typical paths...
This paper introduces a method of estimating the airborne equipment radiation interference and calculating radiation emission limit. According to the uniqueness theorem of electromagnetic field, the model of the radiation source are described, which is theoretically proved that it is equivalent to the radiation source. The method is present with a practical engineering example,which establish a platform...
Trailing Wire Antenna on aircraft is used to transmit VLF/LF messages to submarines. It has two types including Single Trailing Wire Antenna(STWA) and Dual Trailing Wire Antenna(DTWA). STWA is a long wire which is half of wavelength; DTWA consists of a short wire and a long wire, and the total length of DTWA is half of wavelength. Both of two antennas are about more than 5000 meters. This paper presents...
In order to effectively suppress the radiated interference from wires during the EMC design, it is significant to predict the strongest frequency point of radiated emission. Based on the former research, this paper simplifies the formula of differential-mode current radiation model and common-mode current radiation model, defines the concept of radiation ratio between differential-mode and common-mode,...
Reducing mutual coupling between antennas of electrical equipment and system is one of the main topics in electronics design. In this paper, a standard U-shaped corrugated surface was designed and measured for improving the isolation between two antennas. The design is based on numerical method-finite element method (FEM). Detailed optimization on corrugated surface is presented. Both numerical and...
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