Designing a Voltage-Controlled Oscillator Capable of Creating Two Separate Frequency Bands Using Microstrip Technology

Fatemeh Shiri ¹ (Department of Electrical and Computer Engineering- Science and Research Branch, Islamic Azad University, Tehran, Iran)
Massoud Dousti ² (Department of Electrical and Computer Engineering- Science and Research Branch, Islamic Azad University, Tehran, Iran)
Farzin Shama ³ (Department of Electrical Engineering- Kermanshah Branch, Islamic Azad University, Kermanshah, Iran)

Submited date : 2023-04-24 accepted date : 2023-08-10

Keywords: voltage-controlled oscillator, phase noise, dual-band bandpass filter, Monte Carlo analysis, T-shaped resonator,

Abstract :

In this paper, a microstrip dual-band bandpass filter (DB-BPF) is used to design a low phase-noise oscillator. The designed oscillator is fabricated and tested. This filter, which can stabilize frequency, is then implemented in the feedback loop of the low phase-noise oscillator. The phase noise can be largely reduced since the frequency of oscillation is designed at group delay of the edge of the passband. Moreover, the designed oscillator can be restructured to a voltage-controlled oscillator (VCO) when a varactor is connected to a T-shaped resonator of the BPF. The center frequencies of 1.95 and 5.45 GHz are obtained for this oscillator. At the center frequency of 1.95 GHz, a phase noise of -177.1 dBc/Hz is measured at 1 MHz offset. The exact application of these frequency bands is in UMTS and WiMAX radio networks. Additionally, the frequency of the designed VCO can be tuned in the range of 1.84-2.05 GHz within which the measured phase noise at 1 MHz offset increases from -122 to -146.5 dBc/Hz. In this article, Monte Carlo analysis has also been done, and with a tolerance of 5% of all stubs, we have reached a definitive answer with a probability of more than 84%. 

References:

[1] Z. Cai, Y. Yang, X. Zhiyou, D. Lu, Y. Liu, "Ultralow phase-noise different oscillator using quarter stepped-impedance resonator ", IEEE Microwave and Wireless Components Letters, vol. 53. no. 12, pp. 806-809, Dec. 2019 (doi: 10.1109/LMWC. 2019.2946308).

[2] S. Askari, M. Sanaee, "Design and analysis of differential ring voltage controlled oscillator for wide tuning range and low power applications", International Journal of Circuit Theory and application, vol. 47, no. 2, pp. 204-216, Dec. 2018 (doi: 10.1002/cta. 2582).

[3] J. Xu, F. Xiao, Y. Cao, "Low phase noise L-band oscillators based on novel general chebyshev bandpass filters", International Journal of Circuit Theory and application, vol. 48, Issue. 1, pp. 72-83, Dec. 2020 (doi: 10.1002/cta. 2718).

[4] S.J. Cho, N.Y. Kim, "A novel spiral meander spurline resonator and its implementation to a low-phase noise oscillator", Microwave and Optical Technology Letters, vol. 53, no. 11, pp. 2258-2262, July 2011 (doi: 10.1002/mop. 26286).

[5] C.H. Tseng, C.L. Chang, "Design of low phase-noise microwave oscillators and wideband VCO based on mirostrip combline bandpass filters", IEEE Trans. on Microwave Theory and Techniques, vol. 60. no. 10, pp. 3151-61, Oct. 2012 (doi: 10.1109/TMTT. 2012.2210441).

[6] Z. Yang, J. Dong, B. Luo, T. Yang, Y. Lia, "Low phase noise concurrent dual-band oscillator using compact diplexer", Microwave and Wireless Components Letters, vol. 25. no. 10, pp. 672-674, Sept. 2015 (doi: 10.1109/LMWC. 2015.2463217).

[7] M. Hamidkhani, F. Mohajeri, "A low phase noise microwave oscillator based on a high Q SIW cavity CSRR band-pass filter", Journal of Electromagnetic Waves and Applications, vol. 30. no. 16, pp. 2077-2078, Sept. 2016 (doi: 10.1080/09205071.2016.1231088).

[8] H. Zhang, W. Kang, W. Wu, "Low phase-noise oscillator based on SIW bandpass filter implementing at the Qsc-peak frequency", Journal of Electromagnetic Waves and Applications, vol. 33. no. 3, pp. 296-303, Nov. 2018 (doi: 10.1080/09205071.2018.1549512).

[9] W. Xiang, Z. Xiao-Wei, "An X-band push-push oscillator with parallel feedback configuration designed by microstrip balanced bandpass filter", International Journal of RF Computer-Aided Engineering, vol. 29, no. 7, pp. 124-139, May 2019 (doi: 10.1002/mmce. 21663).

[10] S.J. Maleki, M. Dousti, "A compact dual-band bandpass filter using microstrip meander loop and square loop resonators",  IEICE Electronics Express, Vol. 9, no. 16, pp. 1342-1348, May 2012 (doi: 10.1587/elex. 9.1342).

[11] M. R. Zobeyri, A. Eskandari, "Design and fabrication of novel single- and dual-band bandpass filters with modern zero-degree feed structure for wireless communications", Journal of Intelligent Procedures in Electrical Technology, vol. 9, no. 16, pp. 47-61, May 2018 (dor: 20.1001.1.23223871.1397.9.33.5.4)

[12] M. Moradian, S. Nasri, M. Tayarani, "Unequal wilkinson power divider using asymmetric microstrip parallel coupled lines", Journal of Intelligent Procedures in Electrical Technology, vol. 36, no. 9, pp. 13-27, Jan. 2013 (doi: 10.2528/PIERC12110203).

[13] F. Shiri, M. Dousti, F. shama, "Designing a compact microstrip dual-band filter with two t-shaped resonators and suitable frequency selectivity", Journal of Circuits, Systems, and Computers, vol. 31. no. 14, Article Number: 2250247, July 2022 (doi: 10.1142/S0218126622502474).

[14] F. Shiri, M. Dousti, F. Shama, "Design and simulation of a dual-band oscillator based on microstrip bandpass filter", Proceeding of the NCEEIS, pp. 1-5, Najafabad, Iran, May/June 2022.

[15] C.L. Chang, C.H. Tseng, "Design of low phase-noise oscillators and Voltage-Controlled Oscillator using microstrip trisection bandpass filter", IEEE Microwave and Wireless Components Letters, vol. 21, no. 11, pp. 622-624, Oct. 2011 (doi: 10.1109/LMWC. 2011.2168199).

[16] L. Zhipeng, H. Hongyun, L. Yongzhi, B. Jingfu, "Low phase noise Ku-band push–push oscillator based on compact spiral-resonator array", Microwave and Optical Technology Letters, vol. 57, no. 7, pp. 1683-1686, April 2015 (doi: 10.1002/mop. 29142).

[17]  M. Asyaei, E. Ebrahimi, "A low-phase noise injection-locked quadrature voltage-controlled oscillator", Analog Integrated Circuits and Signal Processing, vol. 71. no. 2, pp. 319–325, May 2012 (doi: 10.1007/s10­470-0­11-9779-2).

[18] S.S. Marganeh, M. Dousti, M. Dolatshahi, B. Ghalamkari, "A novel dual-band tunable notch filter with controllable center frequencies and bandwidths", International Journal of Electronics and Communications, vol. 88, pp. 70-77, May 2018 (doi: 10.1016/j. aeue. 2018.02.018).

[19] S.S. Marganeh, M. Dousti, M. Dolatshahi, B. Ghalamkari, "A dual-mode bandpass filter for GSM, UMTS, WiFi, and WiMAX standards applications", International Journal of Circuit Theory and application, vol. 47, no. 4. pp. 561-571, Feb 2019 (doi: 10.1002/cta. 2607).

[20] M. Asyaei, E. Ebrahimi, "A low-phase noise injection-locked quadrature voltage-controlled oscillator", Analog Integrated Circuits and Signal Processing, vol. 71. no. 2, pp. 319–325, May 2012 (doi: 10.100­7/s10­47­0-011-9779-2).