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Lancaster: <i>Microstrip Filters for RF\/Microwave Applications<\/i>, (Wiley, New York, NY, USA, 2001).","DOI":"10.1002\/0471221619"},{"key":"21","unstructured":"[21] X. He and J. Xu: \u201cA filtering antenna with 3rd-order Chebyshev response,\u201d 2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (2016) 1 (DOI: 10.1109\/IMWS-AMP.2016.7588389)."},{"key":"22","unstructured":"[22] X. He, <i>et al<\/i>.: \u201cLightweight and compact high-gain filtering aperture antenna fabricated by three-dimensional printing technology,\u201d IEEE Antennas Wireless Propag. Lett. <b>17<\/b> (2018) 1141 (DOI: 10.1109\/LAWP.2018.2830815)."},{"key":"23","unstructured":"[23] F.-C. Chen, <i>et al<\/i>.: \u201cX-band waveguide filtering antenna array with nonuniform feed structure,\u201d IEEE Trans. Microw. Theory Techn. <b>65<\/b> (2017) 4843 (DOI: 10.1109\/TMTT.2017.2705697)."},{"key":"24","unstructured":"[24] R.H. 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