TAILIEUCHUNG - Microstrip Antennas Part 18

Tham khảo tài liệu 'microstrip antennas part 18', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Integration of 60-GHz Microstrip Antennas with CMOS Chip 499 by selecting the lengths of the patch and slot that enhance the coupling between the patch and ground plane. Further improvement of impedance matching can be achieved by adjusting the patch width. Utilisation of wire bond Interconnection in antenna design The antenna with wire bond interconnections can be designed without a wire bond compensation network if the wire bond interconnection is understood as a high impedance T-line extension of the antenna structure and is then included in the design. Therefore the input impedance seen at 50 Q input source is Z Z ZA jZ0tan pl in 0 Z jZa tan pl 1 where ZA is the antenna input impedance Z0 is the characteristic impedance of the T-line wire bond interconnection p 2nA and l is the length of the T-line. The assumption is that the T-line is lossless. As the overall electrical length of the antenna-feed line structure is now increased by p X the input impedance resonance moves to lower frequencies. The reflection coefficient at the wire bond antenna junction is ZZ p _ ZA Z0 A Z Z ZA Z0 while the overall reflection at 50 Q source input is r Zin - 50Q Zin 50Q 2 3 Under the view of conjugate matching the maximum power transfer from 50 Q source is achieved when Rin 50 Q and Xin 0. Therefore for a fixed wire bond interconnection Z0 the reflections defined in 2 and 3 and impedance matching can be improved by adjusting the input impedance Zin and antenna impedance ZA. These impedances can can be adjusted by decreasing the length of the patch or by increasing the length of the slot. Moreover by properly selecting the length of the patch and the length of the slot a wide bandwidth operation can be achieved. The antenna structure without wire bond interconnection shown in Fig. is designed for 50 Q input impedance matching of better than -10 dB from 57 to 66 GHz. The antenna uses a single layer of Rogers RT Duroid 5880 substrate with relative permittivity equal to

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