Load-modulation technique without using quarter-wavelength transmission line

Ahmed M. Abdulkhaleq*, Maan A. Yahya, Naser O. Parchin, Yasir Al-Yasir, Maryam Sajedin, Issa Elfergani, Neil J. McEwan, Raed A. Abd-Alhameed, Ashwain Rayit, Jonathan Rodriguez

*Awdur cyfatebol y gwaith hwn

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

2 Dyfyniadau (Scopus)

Crynodeb

A proposed method for achieving active load-modulation technique without using a quarter-wavelength transmission line is discussed and evaluated. The theoretical analysis shows that the active load-modulation can be achieved without using a quarter-wavelength line, where the main amplifier sees a low impedance when the input signal level is low, and this impedance increases in proportion to the amount of current contributed from the peaking amplifier. The peaking amplifier sees an impedance decreasing from infinity to the normalized impedance. To validate the method, a circuit was designed, simulated and fabricated using two symmetrical gallium nitride (GaN) transistors (6 W) to achieve a peak power of 12 W and 6 dB output backoff efficiency. The design operates with 400 MHz bandwidth at 3.6 GHz and showed an average efficiency of 50% at 6 dB backoff and an efficiency of 75% at peak power. The designed circuit was tested with CW and modulated signals, the amplifier showed an Adjacent Channel Power Ratio (ACPR) of 31-35.5 dB when tested with a wideband code division multiple access signal of 6 dB peak-average-power ratio (PAPR) at 35.5 dBm average power. Additional 20 dB of linearity improvement was achieved after adding a lineariser.

Iaith wreiddiolSaesneg
Rhif yr erthygl0957
Tudalennau (o-i)1209-1215
Nifer y tudalennau7
CyfnodolynIET Microwaves, Antennas and Propagation
Cyfrol14
Rhif cyhoeddi11
Dyddiad ar-lein cynnar12 Meh 2020
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 9 Medi 2020
Cyhoeddwyd yn allanolIe

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