Cuốn sách này trình bày một cuộc thảo luận bước theo bước của phương pháp tiếp cận tích hợp 3D cho sự phát triển của hệ thống-trên-gói nhỏ gọn (SOP) trước ví dụ của các khối xây dựng tích hợp hoàn toàn thụ động (khoang / microstip bộ lọc, bộ song công, ăng-ten), cũng như gốm đa lớp (LTCC) V-band midule thu phát front-end chứng minh hiệu ứng mang tính cách mạng của phương pháp này RF / đóng gói không dây và thu nhỏ đa chức năng. Thiết kế bao phủ được dựa trên ý tưởng mới và. | THREE-DIMENSIONAL ANTENNA ARCHITECTURES 87 Simulation and Measurement Results Figure a shows the simulated scattering parameters versus frequency for this design. The targeted frequency of operation was around GHz for channel 1 S11 and GHz for channel 2 S22 . The simulated return loss for channel 1 was close to -28 dB at fr GHz while for channel 2 the return loss was -26 dB at fr GHz. The simulated frequency for channel 1 was optimized in order to cover the desired band based on the antenna structure. Channel 2 has a slightly greater bandwidth than that of channel 1 primarily due to the right angle bend in the feedline that can cause small reflections to occur at neighboring frequencies near the resonance point of the lower band. The upper edge frequency fH of the lower band is GHz while the lower edge frequency fL of the higher band is GHz. Figure b shows the measured scattering parameters versus frequency for the design. The measured return loss for channel 1 -20 dB at fr GHz is worse than that obtained through the simulation -26 dB . Conversely the -40 dB of measured return loss atfr GHz obtained for channel 2 is significantly better than the simulated return loss of-28 dB. The diminished return loss of channel 1 is acceptable due to minor losses associated with measurement equipment cables connectors etc. . The enhanced return loss of channel 2 could result from measurement inaccuracies or constructive interference of parasitic resonances at or around the TM10 resonance. The asymmetry in the feeding structure may account for this difference in the measured return loss. Frequency shifts for both channels are present in the measured return loss plots. Additionally the bandwidths of the two channels are wider than those seen in simulations for channel 1 and for channel 2 . Small deviations in the dimensions of the fabricated design as well as measurement tolerances may have .
