tailieunhanh - Microstrip Antennas Part 16

Tham khảo tài liệu 'microstrip antennas part 16', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | DBDP SAR Microstrip Array Technology 439 Fig. 8. S X-band interlaced dipole with patches -10 -20 -10 co -15 w_ frequency GHz frequency GHz a b Fig. 9. Measured S parameter of S X-band array. a X-band element b S-band element The feed array consists of 8 Ku-band elements linear arrays and 16 Ka-band elements linear arrays and top view of the half-model 4 Ku- and 8 Ka-band elements linear arrays is shown in where a Ku-band linear array includes 2 cross slots and a Ka-band one includes 4 microstrip patches. shows the cross-sectional view. Since the slot is bidirectional 4 mm-thick reflector ground plane is used at a distance of about X 4 behind the cross slot. This design has achieved satisfactory performances in both bands verifying the validity for the millimeter wave band application. 440 Microstrip Antennas amplitude dB amplitude dB 0 -10 -20 -30 -40 -50 -60 -90 -60 -30 0 30 60 90 angle deg a b c d Fig. 10. Measured radiation pattern of S X-band array. a H-polarization of X-band b V-polarization of X-band c H-polarization of S-band d V-polarization of S-band DBDP SAR Microstrip Array Technology 441 a Ka-band patches and feed network Ka-band ground plane with Ku-band slots Layer 1 Layer 2 Layer 3 b Fig. 11. Ka Ku array of interlaced cross-slots with patches 17 a Top view b crosssectional view Interlaced ring with patches A DBDP array consisting of interlaced ring with patches for airborne applications is presented in 18 . The S-band antenna elements sit on the top layer and the X-band antennas are on the bottom layer. These two planar arrays with thin substrates are integrated to provide simultaneous operation at S-band 3 GHz and X-band 10 GHz as shown in . The X-band antenna elements are circular patches. They are combined to form a 4x8 array with a gain of dBi using the 4 element series-fed resonant type arrays to save the space of the feeding line network as shown in Fig. 12b. The S-band element is a large .