An antenna system for providing identification functionality comprising: • two antenna structures (11, 111), wherein each antenna structure (11, 111) comprises at least one antenna element (12, 112), • a transceiver module configured to generate a sum interrogation signal and a delta interrogation signal, • a signal processing means, wherein the signal processing means is configured to process provided sum and delta interrogation signals into transmission signals, • at least two transmit-receive modules (40, 140), wherein each of the transmit-receive modules (40, 140) is configured to transmit a transmission signal provided by the signal processing means by means of a respective one of the antenna structures (11,111), wherein when in operation the transceiver module is connected to the signal processing means, the signal processing means is connected to the transmit-receive modules (40, 140), and the transmit-receive modules (40,140) are connected to the antenna structures (11, 111), and wherein each transmit-receive module (40, 140) is provided with an amplifying circuitry (50, 150), the antenna system being characterized in that each amplifying circuitry (50, 150) comprises: a splitter node (51, 151), wherein the splitter node (51, 151) is configured to split the transmission signal in at least a first and a second amplifier signal, a main power amplifier circuit (55, 155), wherein the main power amplifier circuit (55, 155) comprises a main amplifier (53, 153), wherein the main amplifier (53, 153) is configured to amplify the first amplifier signal, an auxiliary power amplifier circuit (56, 156), wherein the auxiliary power amplifier circuit (56, 156) comprises an auxiliary amplifier (54, 154), wherein the auxiliary amplifier (54, 154) is configured to amplify the second amplifier signal, and a power combiner node (52, 152), wherein the power combiner node (52, 152) is configured to combine the first and the second amplifier signal of the main power amplifier circuit (55, 155) and of the auxiliary power amplifier circuit (56, 156), and wherein the main power amplifier circuit (55, 155) and the auxiliary power amplifier circuit (56, 156) are provided in parallel between the power splitter node (51, 151) and the power combiner node (52, 152). • two antenna structures (11, 111), wherein each antenna structure (11, 111) comprises at least one antenna element (12, 112), • a transceiver module configured to generate a sum interrogation signal and a delta interrogation signal, • a signal processing means, wherein the signal processing means is configured to process provided sum and delta interrogation signals into transmission signals, • at least two transmit-receive modules (40, 140), wherein each of the transmit-receive modules (40, 140) is configured to transmit a transmission signal provided by the signal processing means by means of a respective one of the antenna structures (11,111), a splitter node (51, 151), wherein the splitter node (51, 151) is configured to split the transmission signal in at least a first and a second amplifier signal, a main power amplifier circuit (55, 155), wherein the main power amplifier circuit (55, 155) comprises a main amplifier (53, 153), wherein the main amplifier (53, 153) is configured to amplify the first amplifier signal, an auxiliary power amplifier circuit (56, 156), wherein the auxiliary power amplifier circuit (56, 156) comprises an auxiliary amplifier (54, 154), wherein the auxiliary amplifier (54, 154) is configured to amplify the second amplifier signal, and a power combiner node (52, 152), wherein the power combiner node (52, 152) is configured to combine the first and the second amplifier signal of the main power amplifier circuit (55, 155) and of the auxiliary power amplifier circuit (56, 156), and wherein the main power amplifier circuit (55, 155) and the auxiliary power amplifier circuit (56, 156) are provided in parallel between the power splitter node (51, 151) and the power combiner node (52, 152).