Weighted average $$Q$$Q-factor calculation for single port filter-antenna measurement

Filter-antenna has many advantages like no need of match network, low insertion loss, ease of design, low cost and light weight. However, practical implementation of filter-antenna requires a precise value of $$Q$$Q-factor. Filter-antenna is a single device, handling radiating and filtering properties simultaneously, making it difficult to extract $$Q$$Q-factor for such device. Moreover, filter-antenna has single port and designer is required to calculate $$Q$$Q-factor from single port. As reported in literature that the available methods for calculation of $$Q$$Q-factor from single port seem inaccurate. This paper presents a novel $$Q$$Q-factor calculation method that outperforms existing methods for almost every case of filter-antenna. Experimental results verify the superior performance of proposed method relative existing methods.