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A novel design of tri-band branch-line couplers using tri-band transmission lines is presented in this paper. The proposed tri-band transmission line employs a Pi-type line with open- and short-ended stubs. The line with Pi-type structure is applied to realize the dual-band operation at the first two frequencies (f2/f1). To achieve the third operating frequency ratio (f3), the open- and short-ended...
A general method for designing a 3 dB 180° directional coupler with arbitrary branch lengths is proposed. Full wave electromagnetic simulation is conducted to verify the design theory. An experimental prototype of a 1.06λ-ring rat-race coupler with arm lengths λ/12, 7λ/12, λ/5, and λ/5 has been fabricated. The measurement results validate the proposed design method.
In this letter, two types (Type-I and Type-II) of microwave baluns with generalized structures are presented. Different from the conventional transmission-line-based baluns where transmission lines or microstrip lines are used, the proposed baluns are constructed by transmission lines with arbitrary electrical lengths. Both of the two types of baluns are designed based on a symmetric...
This paper carries out a summary and analysis on the observation result of induced voltage waveforms caused by nearby natural lightning on 220-V rated low-voltage overhead distribution lines in Guangzhou Field Experiment Site for Lightning Research and Testing (GFESLRT) during Summer 2008. It can be observed that when surge protective device (SPD) is not connected, the maximum peak value of induced...
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