volume | PIER Journals

Abstract

A novel 1.8 GHz compact microstrip low-pass filter (LPF) based on quasi-yagi defected ground structure (DGS) and compensated capacitors is proposed in this paper. The filter has a very sharp cut-off frequency response with low insertion loss and achieves a wide reject band with overall 20 dB attenuation from 2.8 GHz up to 10 GHz. The equivalent circuit model of Yagi-DGS-unit is derived using AWR software, and the circuit parameters are extracted by using a simple circuit analysis method. The advantage of this structure is that the reject band can be controlled by tuning the dimension of Yagi-arms at higher frequency rang. The proposed 1.8 low-pass filter is designed using microwave office electromagnetic software and fabricated on the RO4003 ceramic structure with dielectric constant of 3.38. The compact filter occupies an area of (0.45λ_g × 0.35λ_g) with λ_g = 44 mm. A comparison between simulation and measurement results confirms the validity of the LPF configuration and design procedure. In order to improve the compactness of the proposed LPF, a new multi-layer method has been employed. Finally, a new minimized LPF-topology 50% more compact than the conventional is realized.

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2. Boutejdar, A., N. M. Eltabit, A. A. Ibrahim, and E. P. Burte, "Design of wide stop band Lband LPF based on DMS-DGS-technique for radar applications," Hindawi Publishing Corporation International Journal of Microwave Science and Technology, Vol. 2015, Article ID 101602, 7 pages, 2015.

3. Boutejdar, A., A. Rahman, A. Batmanov, A. Omar, and E. Burte, "Miniaturized band-stop filter based on multilayer-technique and new coupled octagonal DGS with interdigital capacitor," Microw. Opt. Technol. Lett., Vol. 52, No. 3, 510-514, Mar. 2010.
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5. Boutejdar, A., A. Batmanov, A. Omar, and E. Burte, "A miniature 3.1GHz microstrip bandpass filter with suppression of spurious harmonics using multilayer technique and defected ground structure open-loop ring," Ultra-wideband, Short-pulse Electromagnetics, 191-200, New York, Springer, ISBN 978-0-387-77844-0, 2010.

6. Abdel-Rahman, A., A. K. Verma, A. Boutejdar, and A. S. Omar, "Compact stub type microstrip bandpass filter using defected ground plane," IEEE Microwave and Wireless Components Letters, Vol. 14, 136-138, 2004.
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9. Boutejdar, A., M. Makkey, A. Elsherbini, and A. Omar, "Design of compact stop-band extended microstrip low-pass filters by employing mutual-coupled square-shaped defected ground structures," Microwave and Optical Technology Letters, Vol. 50, No. 4, 1107-1111, Apr. 2008.
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11. Boutejdar, A., A. Batmanov, E. Burte, and A. Omar, "Design of a new bandpass filter with sharp transition band using U-defected ground structure (DGS) and multilayer-technique," IET Microwave, Antennas and Propagation, Vol. 4, No. 9, 1415-1420, Sep. 2010.
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12. Boutejdar, A., W. Abd Ellatif, A. A. Ibrahim, and M. Challal, "A simple transformation from lowpass to bandpass filter using a new quasi-arrow head defected ground structure resonator and gap-J-inverter," Microwave and Optical Technology Letters, Vol. 58, No. 4, 947-953, Apr. 2016.
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13. Tizyi, H., F. Riouch, A. Tribak, A. Najid, and A. Mediavilla Sanchez, "CPW and microstrip linefed compact fractal antenna for UWB-RFID applications," Progress In Electromagnetics Research C, Vol. 65, 201-209, 2016.
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14. Boutejdar, A., A. A. Ibrahim, and E. P. Burte, "A compact multiple band-notched planer antenna with enhanced bandwidth using parasitics strip lumped capacitors and DGS-technique," Telkomnika Idonesian Journal of Electrical Engineering, Vol. 13, No. 2, 2015.

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20. Chen, J., Z.-B. Weng, Y.-C. Jiao, and F.-S. Zhang, "Lowpass filter design of hilbert curve ring defected ground structure," Progress In Electromagnetics Research, Vol. 70, 269-280, 2007.
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21. Boutejdar, A., A. Omar, and E. Burte, "Miniaturized lowpass and bandstop filters using controlled coupling of open-loop-ring defected ground structure (DGS)," Microwave and Optical Technology Letters, Vol. 52, No. 11, 2575-2578, Nov. 25, 2010.
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22. Challal, M., A. Boutejdar, A. Dehmas, M. Azrar, and A. Omar, "Compact microstrip low-pass filter design with ultra-wide reject band using a novel quarter-circle DGS shape," Aces Journal, Vol. 27, No. 10, 808-815, Oct. 2012.

23. Ting, S. W., K. W. Tam, and R. P. Martins, "Miniaturized microstrip lowpass filter with wide stop-band using double equilateral U-shaped defected ground structure," IEEE Microwave Wireless Compon Lett., Vol. 16, 240-242, May 2006.
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Dr. Ahmed Boutejdar

Dr. Wael Abd Ellatif Ali