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Three-Dimensional Integration and Modeling Part 9

Tham khảo tài liệu 'three-dimensional integration and modeling part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CAVITY-TYPE INTEGRATED PASSIVES 71 Frequency GHz FIGURE 5.24 Measured and simulated S-parameters of the quasielliptic dual-mode cavity filter with a rectangular slot for inter coupling between cavities. upper side 3 GHz. A study of the dual-mode coupling in each cavity on the basis of the initial determination of the cavity size resonating at a desired center frequency 66 GHz is performed first. Then the final configuration of the three-pole dual-band filter can be obtained through the optimization of the intercoupling slot size and offsets via simulation. All the design parameters for the filters are summarized in Table 5.6. Figure 5.24 shows the measured performance of the designed filters with a rectangular slot along with a comparison to the simulated results. It can be observed that the measured results in the case of a rectangular slot produce a center frequency of 66.2 GHz with the bandwidth of 1.2 GHz 1.81 and the minimum insertion loss in the passband around 2.9 dB. The simulation showed a minimum insertion loss of 2.5 dB with a slightly wider 3-dB bandwidth of 1.7 GHz 2.58 around the center frequency of 65.8 GHz. The center frequency shift is caused by XY shrinkage of 3 . The two measured transmission zeros with a rejection better than 34 dB and 37 dB are observed within 1.55 GHz and 2.1 GHz respectively away from the center frequency at the lower band than the passband. One transmission zero is observed within 1.7 GHz at the higher band than the passband. The discrepancy of the zero positions and rejection levels between the measurement and the simulation can be attributed to the fabrication tolerances as explained in Section 5.4.1.5. Still it can be observed that the behavior of transmission zeros shows a good correlation of measurements and simulations. 72 THREE-DIMENSIONAL INTEGRATION M34 FIGURE 5.25 Multicoupling diagram for the vertically stacked multipole dual-mode cavity filter with a rectangular slot for intercoupling between two cavities. This .