Abstract
Impedance-matched Planar-antenna-integrated High-efficiency Push-pull Power Amplifier with Center-tapped Transformer for 5 GHz Wireless Communication
Highlights
Increasing demand for wireless communication systems has promoted intensive development to realize high data rates with quadrature amplitude modulation (QAM) and low-power circuit components
The output impedance of the power amplifier (PA) is widely matched to 50 Ω using inductors and capacitors (LC impedance-matching network); the parasitic resistors in the LC impedance-matching network reduce the performance of the PA, i.e., the gain and power-added efficiency (PAE)
Because the output impedance of the proposed PA is not tuned to 50 Ω, the output impedance should be calculated from the measured S-parameter with impedance conversion owing to the 50 Ω input impedance of the measurement instrument
Summary
Increasing demand for wireless communication systems has promoted intensive development to realize high data rates with quadrature amplitude modulation (QAM) and low-power circuit components. An impedance-matching circuit is designed to have the input and output impedances of 50 Ω; it exhibits power loss that may reduce the efficiency of the transmitter. We propose a high-efficiency wireless transmitter with an impedance-matched antenna. We design a matching block of the antenna to maximize the efficiency of the transmitter. The transmitter including the proposed PA and antenna has a power-added efficiency (PAE) of 15.7% in linear operation and a maximum PAE of 30.7%. The simulated and measured results of the proposed transmission are explained in Sect. We describe the design of the proposed PA, the simulated results, and the results of a comparison with a conventional PA
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