Integrated active Doherty antenna transmitter
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsChristian Fager, William Hallberg, Oleg Iupikov, Marianna Ivashina, Rob Maaskant
Life of this patent
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Abstract
System including a dual-fed antenna element is designed to present 2×2 port impedances that guarantee high efficiency operation of the main- and auxiliary transistors at peak- and backed off power. The proposed solution eliminates the need for lossy power combining, such as PCB based circuit combining or impedance matching networks between the antenna element and the main- and auxiliary amplifiers. The power from the main- and auxiliary transistors are combined at the circuit level by the antenna element.
Claims9
A transmitter comprising a Doherty amplifier and an antenna element (AN),
- the Doherty amplifier comprising an input splitter, for splitting an input signal to a main amplifier having an output and to a phase delay connecting again to an auxiliary amplifier having an output,
- wherein the antenna element is a dual-fed antenna element (AN) having first and second antenna parts (A1, A2),
- the first antenna part (A1) having a first feed (F1),
- the second antenna part (A2) having a second feed (F2),
- the output of the main amplifier connecting to the first feed (F1) of the dual feed antenna element,
- the output of the auxiliary amplifier connecting to the second feed (F2) of the dual feed antenna element,
- wherein the dual-fed antenna element (AN, 43′) implements lossy two-port parameters of a combiner derivation such that the antenna element (AN, 43′) simultaneously is acting as a radiator, impedance matching network, and Doherty combiner.
A method of constructing a transmitter including a Doherty amplifier and an antenna element (AN), the method comprising:
- providing the Doherty amplifier comprising an input splitter, for splitting an input signal to a main amplifier having an output and to a phase delay connecting again to an auxiliary amplifier having an output,
- providing an antenna element that is a dual-fed antenna element (AN) having first and second antenna parts (A1, A2), the first antenna part (A1) having a first feed (F1), the second antenna part (A2) having a second feed (F2),
- arranging the output of the main amplifier connecting to the first feed (F1) of the dual feed antenna element,
- arranging the output of the auxiliary amplifier connecting to the second feed (F2) of the dual feed antenna element,
- forming the dual-fed antenna element (AN, 43′) such that it implements lossy two-port parameters of a combiner derivation such that the antenna element (AN, 43′) simultaneously is acting as a radiator, impedance matching network, and Doherty combiner.
Dependencies are inferred from the claim text.