An antenna, comprising: multiple feeders, a microstrip antenna array, and at least one energy attenuation circuit, wherein the microstrip antenna array comprises multiple array elements, wherein each of the multiple array elements is connected to a cable feeding port by using one of the multiple feeders; each of the at least one energy attenuation circuit is located at a to-be-attenuated feeder and divides the to-be-attenuated feeder into two segments, wherein the to-be-attenuated feeder is a feeder that is of the multiple feeders and that is connected to a to-be-attenuated array element, and the to-be-attenuated array element is an array element located at a periphery of the multiple array elements; a first end of the energy attenuation circuit is connected to the cable feeding port by using one segment of the to-be-attenuated feeder, a second end of the energy attenuation circuit is connected to the to-be-attenuated array element by using the other segment of the to-be-attenuated feeder, and a third end of the energy attenuation circuit is grounded; and the energy attenuation circuit comprises a resistor, wherein the resistor is grounded, and the resistor is configured to consume a part of energy in the to-be attenuated feeder in a grounded manner characterised in that: the at least one energy attenuation circuit is located at an entrance feeder of a to-be-attenuated array element, the entrance feeder being a branch feeder connecting only to the to-be-attenuated array element, wherein each of the at least one energy attenuation circuit is a symmetric resistive attenuator being a T-type resistive attenuator comprising a first resistor, a second resistor and a third resistor, wherein a first end of the first resistor is a first end of the energy attenuation circuit, a second end of the first resistor is connected to a first end of the second resistor, a second end of the second resistor is a second end of the energy attenuation circuit, a first end of the third resistor is connected to the second end of the first resistor, and a second end of the third resistor is a third end of the energy attenuation circuit; and resistances of the first resistor, the second resistor, and the third resistor are respectively: R 1 = R 2 = 1 + A 1 − A R − R 3; and R 3 = 2 R A 1 − A; wherein R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, R3 is the resistance of the third resistor, A is an energy attenuation coefficient, and R is a characteristic impedance of the to-be-attenuated feeder. the at least one energy attenuation circuit is located at an entrance feeder of a to-be-attenuated array element, the entrance feeder being a branch feeder connecting only to the to-be-attenuated array element, wherein each of the at least one energy attenuation circuit is a symmetric resistive attenuator being a T-type resistive attenuator comprising a first resistor, a second resistor and a third resistor, wherein a first end of the first resistor is a first end of the energy attenuation circuit, a second end of the first resistor is connected to a first end of the second resistor, a second end of the second resistor is a second end of the energy attenuation circuit, a first end of the third resistor is connected to the second end of the first resistor, and a second end of the third resistor is a third end of the energy attenuation circuit; and resistances of the first resistor, the second resistor, and the third resistor are respectively: R 1 = R 2 = 1 + A 1 − A R − R 3; and R 3 = 2 R A 1 − A; wherein R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, R3 is the resistance of the third resistor, A is an energy attenuation coefficient, and R is a characteristic impedance of the to-be-attenuated feeder.