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Three-Dimensional Integration and Modeling Part 11

Tham khảo tài liệu 'three-dimensional integration and modeling part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 91 CHAPTER 7 Fully Integrated Three-Dimensional Passive Front-Ends In this chapter two examples featuring the compact integration of antennas and filters for TDD and FDD 60 GHz applications will be used as the closing statement of the very high potential of the multilayer integration approach especially in the mm-wave frequency range. 7.1 PASSIVE FRONT-ENDS FOR 60 GHz TIME-DIVISION DUPLEXING TDD APPLICATIONS In the 60 GHz front-end module development the compact and efficient integration of the antenna and filter is a crucial issue in terms of real estate efficiency and performance improvement in terms of high level of band selectivity reduced parasitic problems and low filtering loss. Particularly when the integration is constructed in a high-er material such as low temperature cofired ceramic LTCC the excitation of strong surface waves causes unwanted coupling between the antenna and the rest of the components on the board. Using quasi-elliptic filters and the series-fed array antenna it is now possible to realize a V-band compact integrated front-end. 7.1.1 Topologies The three-dimensional 3D overview and cross-sectional view of the topology chosen as the benchmark for the efficient compact integration are shown in Fig. 7.1 a and b respectively. The four-pole quasielliptic filter and the 1 X 4 series fed array antenna are located on the top metallization layer metal1 in Fig. 7.1 b and are connected together with a tapered microstrip transition 61 as shown in Fig. 7.1 a . The design of the tapered microstrip transition aims to annihilate the parasitic modes from the 50 microstrip lines discontinuities between the two devices and to maintain a good impedance matching 20 dB bandwidth 10 . The ground planes of the filter and the antenna are located on metal 3 and 7 respectively. The ground plane of the filter is terminated with a 175 xm extra metal pad from the edge of the antenna feedline due to LTCC design rules and the two ground planes on metal 3 and 7 are .