Codesign of Electrically Short Antenna–Electronics Interfaces in the Receiving Mode

Abstract

The aim of this brief is to point out the importance of co-designing electrically-short antenna-electronics interfaces as a way to improve the system performance. This can be achieved if both the antenna and electronic circuit designer have a common optimization target. In this brief, the co-design principles are presented for antenna systems in the receiving mode, which includes reception of wireless information and wireless power. A general interface analysis is carried out, suggesting that the choice of interface impedance plays a crucial role in the optimization procedure and depends on the preferred signal quantity of the electronic circuit. This allows to effectively improve design criteria such as noise figure, power efficiency and sensitivity without increasing the power consumption. Finally, two examples are treated to demonstrate the antenna-electronics co-design for the reception of wireless information (LNA) and wireless power (RF energy harvesting).

Energy-Efficient Low-Power Circuit Techniques for Wireless Energy and Data Transfer in IoT Sensor Nodes

“…An optimum choice of antenna impedance Z A and load impedance Z L allows us to increase the voltage or current at the antenna load for the same available power at the antenna. As addressed in [8], one needs to design the electronic circuit for the largest quality factor of Z L possible and subsequently co-design the antenna impedance for conjugate matching. This conclusion is a key point that needs to be considered during a codesign procedure.…”

Reputation detection based on incomplete β distribution for mobile agent in wireless sensor networks

“…Mobile agent server needs to carry out a series of security operations, such as access control, privilege allocation. These measures are based on the identity verification mechanism, and the code signature proposed by Stoopman et al 1 is the most common method. This method is that the owners of the mobile agent make the digital signature in the mobile agent information and code.…”

“…Therefore, we only consider the one-degree and two-degree indirect reputation. The comprehensive reputation of a mobile agent is derived from the direct reputation and indirect reputation weighted sum, as shown in formula (1). a 1 and a 2 are the correlation coefficients, a 1 + a 2 = 1.…”

“…According to the security threats of mobile agent server, researchers put forward some solutions, such as code signing, 1 state verification, 2 historical path recording method, 3 and sandbox mechanism 4 . In the security of mobile agent transfer process, researchers put forward some solutions, such as asymmetric encryption method, 5 a mixed variety of encryption mechanisms, 6 and pretty good privacy (PGP) encryption algorithm 7 .…”

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