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This paper proposes a novel and easily-implemented method for Class-J power amplifiers. The 2nd harmonic impedance matching networking is designed and realized by using microstrip stub networks. To prove the concept, a PA prototype operating at the frequency range from 1.7 GHz to 2.24 GHz is implemented. In the field experimental results, it achieves the drain efficiency of above 62% at a fractional...
This study constructs stepped-impedance coupled-lines for a dual-band coupler design over a frequency ratio range of 1.8-3.0. The proposed structure demonstrates good dual-band performance and compact size due to the centric arrangement of the excitation ports, which allows a more space-efficient circuit configuration. The developed synthesis method utilizes stepped impedance coupled-line to achieve...
A novel low cost radiated emission measurement system by using current probe has been proposed in this paper. Compared with conventional anechoic chamber measurement method, this new method could reduce test cost and save developing time efficiently. In order to improve the accuracy, a transfer function has been built for mapping the relationship between current probe method and anechoic chamber method...
A novel shunt-fed triband printed two-element collinear dipole array is presented in this letter. The planar dipole array configuration is designed using two shunt-fed back-to-back dipole elements with omnidirectional pattern. The motivation for this work was to devise a novel feed structure that has an advantage of structural simplicity with good performance. The proposed antenna can provide the...
A frequency reconfigurable hexagonal patch antenna with switchable slot is proposed in this paper. By changing the slot status, two resonant frequency bands at 2.29GHz and 2.46GHz respectively can be obtained without special matching network, and the radiation patterns at the two frequency bands are very similar to each other. The simulated and measured results are presented to validate this concept,...
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