Dual band Doherty power amplifier using CRLH transmission lines.
Date Issued
2014
Date
2014
Author(s)
Lee, Chung-Lun
Abstract
This thesis presents a new design implementation and experimental results of a dual-band E-pHEMTs Doherty power amplifier (DPA) using composite right/left-handed transmission line (CRLH-TL). The transmission line incorporating CRLH-TL is designed to replace those realized by conventional transmission lines. Compared to T-shape network or dual-band coupled line, the proposed CRLH-TL DPA has more compact circuit structure.
In addition to the transmission line, the power divider and the PA unit cell also shall be in the dual-band operation. The proposed CRLH-TL is applied to implement a dual-band DPA for the frequency bands at 0.85 and 1.9 GHz. This thesis uses both surface mount devices and low temperature co-fired ceramic (LTCC) for the matching network and the CRLH-TL implementation. Simulation results for power added efficiency (PAE) are 35.7% and 52.7% for the two frequencies. The PAE at back-off output power exceeds 35% for both bands. The gains at the two frequencies are 10dB and 6.6dB, respectively. The output power can be achieved at average of 28dBm at both 0.85 and 1.9GHz.
Subjects
Doherty功率放大器
包絡峰/均功率比(PAPR)
左右手傳輸線
高速電子移動電晶體(HEMT)
Type
thesis
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