naa a22 4500 51079906X CHVBK 20180411083347.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11277-013-1082-3 doi (NATIONALLICENCE)springer-10.1007/s11277-013-1082-3 Improved $$Q$$ -Factor Calculations for Single Port Filter-Antenna Measurement [Elektronische Daten] [Khurram Alimgeer, Shahid Khan, Shahzad Malik] These days most of the research work in the area of filter-antenna design is focused on having high quality factor for certain frequency band. These type of filter-antennas are difficult to design as the design engineers are required to have low quality factor for the radiating band of frequency. Hence a precise value of $$Q$$ -factor is required to understand the radiating and filtering properties of filter-antennas. Filter-antennas are single port devices as the second port is considered as radiating port. Return loss is used, in order to yield $$Q$$ -factor through calculations for such devices. However, the conventional method for calculating $$Q$$ -factor found to be inaccurate in most of the low $$Q$$ -factor cases. This paper proposes a method that out performs the conventional method of calculating $$Q$$ -factor. Non-ideal fabrication process is also discussed for accurate evaluation of $$Q$$ -factor. Experimental results show that proposed method can be employed to calculate $$Q$$ -factor with reasonable accuracy for simulated and measured results. Springer Science+Business Media New York, 2013 Filter-antenna nationallicence Single port measurements nationallicence $$Q$$ -factor nationallicence Alimgeer Khurram COMSATS Institute of Information Technology, Park Road, Chak Shahzad, Islamabad, Pakistan aut Khan Shahid COMSATS Institute of Information Technology, Park Road, Chak Shahzad, Islamabad, Pakistan aut Malik Shahzad COMSATS Institute of Information Technology, Park Road, Chak Shahzad, Islamabad, Pakistan aut Wireless Personal Communications Springer US; http://www.springer-ny.com 72/2(2013-09-01), 1351-1359 0929-6212 72:2<1351 2013 72 11277 https://doi.org/10.1007/s11277-013-1082-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-013-1082-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Alimgeer Khurram COMSATS Institute of Information Technology, Park Road, Chak Shahzad, Islamabad, Pakistan aut NATIONALLICENCE 700 1- Khan Shahid COMSATS Institute of Information Technology, Park Road, Chak Shahzad, Islamabad, Pakistan aut NATIONALLICENCE 700 1- Malik Shahzad COMSATS Institute of Information Technology, Park Road, Chak Shahzad, Islamabad, Pakistan aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 72/2(2013-09-01), 1351-1359 0929-6212 72:2<1351 2013 72 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer