Design Of Dual-Band Dual-Polarization Missile-Borne AESA Antennas

AESA(Active Electronically Scanned Array)antennas have been widely used in military guidance because of its advantages such as fast scanning,easy beam formation and multi-functions.In this field,the performance of the missile-borne AESA antenna directly determines the effectiveness of the missile.With the development of information technology,radar systems have pushed the antenna toward the direction of dual-frequency dual-polarization,beam full coverage and shared aperture.Dual-frequency dual-polarization antenna can realize the sharing of transmission and reception,expand the communication capacity,improve the detection and identification probability of the target,and enhance the anti-interference ability.The shared aperture technology plays an important role in achieving multi-functionality,reducing the volume of the antenna,realizing miniaturization and cutting cost.The purpose of this article is to study dual-frequency dual-polarization missile-borne AESA antennas.The main content includes two parts:The first part is the S-band dual-frequency dual circularly polarized missile-borne AESA antenna.First,an S-band dual-frequency dual circularly polarized antenna has designed.The antenna is a double-fed laminated microstrip antenna,which uses a loop bridge to feed power to broaden the antenna bandwidth.In addition,in order to widen the antenna lobe width,metal pillars and ring-shaped metal bands have added around the antenna patch.Then a small planar array with five elements in the missile has studied.There are three pairs of the small array,which have mounted on different sides of the missile body to maximize the beam coverage.Finally,the experimental results show that the simulation and measured results are in good agreement.It lays the foundation for the application of missile-borne satellite communications.The second part is the Ku/Ka dual-frequency dual-polarization shared aperture missile-borne AESA antenna.The Ku antenna in the shared aperture array is a dual line polarized larger planar rectangular array.The Ka antenna is sparse array around the Ku antenna.The Ka antenna polarization is vertically polarized.The array elements of Ku and Ka antenna are the same.First,Ku and Ka antennas have designed to meet the shared aperture conditions.All antennas are broadband microstrip antennas.The slot-coupled feed and the air cavity have designed to broaden the antenna bandwidth.In addition,metallized shielding holes have adopted around the antenna patch and feeder to reduce the effect of antenna mutual coupling.Then the array synthesis algorithms have designed,including Ku rectangular array low side lobe algorithm and Ka sparse array algorithm.Finally,a small array of Ku/Ka shared aperture array has used for full-wave electromagnetic simulation and proofing verification.The verification results show that the antenna meets the requirements of engineering application.It lays the foundation for the engineering application of the dual-frequency dual-polarization shared aperture missile-borne AESA antenna.