volume | PIER Journals

Abstract

A compact microstrip Rotman lens is proposed in this paper. The microstrip Rotman lens consists of a lens body and Chebyshev impedance transformers. The Chebyshev impedance transformers are used as beam ports, array ports and dummy ports. Compared to the traditional linear tapered transition, the Chebyshev impedance transformer is shorter, which leads to the size reduction and insertion loss improvement for the Rotman lens. An X-band 4×7 Rotman lens using Chebyshev impedance transformers is designed and fabricated. Compared to a traditional Rotman lens, the proposed Rotman lens shows a size reduction of about 56% and an insertion loss improvement at 10 GHz. The measured results demonstrate that better than 15 dB return loss throughout the bandwidth from 8 to 12 GHz is obtained.

1. Sinha, Nirmalendu Bikas, R.-N. Bera, and M. Mitra, "Digital array MIMO radar and its performance analysis," Progress In Electromagnetics Research C, Vol. 4, 25-41, 2008.
doi:10.2528/PIERL08050205 Google Scholar

2. Hong, T., M.-Z. Song, and X.-Y. Sun, "Design of a sparse antenna array for communication and direction finding applications based on the Chinese remainder theorem," Progress In Electromagnetics Research, Vol. 98, 119-136, 2009.
doi:10.2528/PIER09091703 Google Scholar

3. Rotman, W. and R. F. Turner, "Wide-angle microwave lens for line source applications," IEEE Transactions on Antennas Propagation, Vol. 11, No. 6, 623-632, Nov. 1963.
doi:10.1109/TAP.1963.1138114 Google Scholar

4. Attaran, A., R. Rashidzadeh, and A. Kouki, "60 GHz low phase error Rotman lens combined with wideband microstrip antenna array using LTCC technology," IEEE Transactions on Antennas and Propagation, Vol. 64, No. 12, 5172-5180, Dec. 2016.
doi:10.1109/TAP.2016.2618479 Google Scholar

5. Attaran, A. and S. Chowdhury, "Fabrication of a 77 GHz Rotman lens on a high resistivity silicon wafer using lift-off process," International Journal of Antennas and Propagation, 1-9, article ID: 471935, 2014. Google Scholar

6. Attaran, A., R. Rashidzadeh, and R. Muscedere, "Rotman lens combined with wide bandwidth antenna array for 60 GHz RFID applications," Int. J. Microw. Wireless Technol., Vol. 9, No. 1, 1-7, Aug. 2015. Google Scholar

7. Cheng, Y. J., et al. "Substrate integrated waveguide (SIW) Rotman lens and its Ka-band multibeam array antenna applications," IEEE Transactions on Antennas and Propagation, Vol. 56, No. 8, 2504-2513, Aug. 2008.
doi:10.1109/TAP.2008.927567 Google Scholar

8. Lee, W., J. Kim, C. S. Cho, and Y. J. Yoon, "Beamforming lens antenna on a high resistivity silicon wafer for 60 GHz WPAN," IEEE Transactions on Antennas and Propagation, Vol. 58, No. 3, 706-713, Dec. 2010.
doi:10.1109/TAP.2009.2039331 Google Scholar

9. Vo Dai, T. K., T. Nguyen, and O. Kilic, "A compact microstrip Rotman lens design," Radio Science Meeting, 1-2, United States National Committee of URSI National, Boulder, USA, 2017. Google Scholar

10. Tekkouk, K., M. Ettorre, L. Le Coq, and R. Sauleau, "Multi-beam SIW slotted waveguide antenna system fed by a compact dual-layer Rotman lens," IEEE Transactions on Antennas and Propagation, Vol. 64, No. 2, 504-514, Nov. 2016.
doi:10.1109/TAP.2015.2499752 Google Scholar

11. Young, L., "Stepped-impedance transformers and filter prototypes," IRE Trans. Microwave Theory Tech., Vol. 10, No. 5, 339-359, Sep. 1962.
doi:10.1109/TMTT.1962.1125523 Google Scholar

Dr. Qiuyan Liang

Dr. Bao-Hua Sun

Dr. Gaonan Zhou

Dr. Jianfeng Li