{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,17]],"date-time":"2026-03-17T20:07:23Z","timestamp":1773778043030,"version":"3.50.1"},"reference-count":50,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2024,1,10]],"date-time":"2024-01-10T00:00:00Z","timestamp":1704844800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"King Saud University","award":["RSP2024R474"],"award-info":[{"award-number":["RSP2024R474"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Switched filter banks find widespread application in frequency-hopping radar systems and communication networks with multiple operating frequencies, especially in situations demanding elevated filter element isolation. In this paper, the design and implementation of a highly isolated switchable narrow-bandpass filter bank architecture using hairpin microstrip topology is presented. The filter bank has four discrete bandpass filters with passbands of 2.0\u20132.2 GHz, 2.3\u20132.5 GHz, 3.1\u20133.3 GHz, and 3.9\u20134.1 GHz. These filters span the radar S-frequency band (2.0\u20134.0 GHz). In order to switch between channels with a switching speed of nanoseconds, low-loss and highly isolated SP4T switches are implemented. Advanced design system (ADS) software is used to design the various filter functionalities, and the entire system is tested on a vector network analyzer (VNA). The proposed architecture makes it much easier to put the filter bank into practice and switch it to the desired frequency, which is useful for radar receiver applications.<\/jats:p>","DOI":"10.3390\/s24020434","type":"journal-article","created":{"date-parts":[[2024,1,10]],"date-time":"2024-01-10T09:39:57Z","timestamp":1704879597000},"page":"434","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["A High-Performance, Low-Cost, and Integrated Hairpin Topology RF Switched Filter Bank for Radar Applications"],"prefix":"10.3390","volume":"24","author":[{"given":"Talha Shahid","family":"Alvi","sequence":"first","affiliation":[{"name":"MicroNano Lab, Department of Electrical Engineering, Information Technology University of the Punjab, Lahore 56000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Muhammad Haris","family":"Ahsan","sequence":"additional","affiliation":[{"name":"MicroNano Lab, Department of Electrical Engineering, Information Technology University of the Punjab, Lahore 56000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Muhammad","family":"Ali","sequence":"additional","affiliation":[{"name":"MicroNano Lab, Department of Electrical Engineering, Information Technology University of the Punjab, Lahore 56000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Faizan","family":"Ramzan","sequence":"additional","affiliation":[{"name":"MicroNano Lab, Department of Electrical Engineering, Information Technology University of the Punjab, Lahore 56000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5282-1316","authenticated-orcid":false,"given":"Khaled A.","family":"Aljaloud","sequence":"additional","affiliation":[{"name":"College of Engineering, Muzahimiyah Branch, King Saud University, P.O. Box 2454, Riyadh 11451, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8143-7981","authenticated-orcid":false,"given":"Ali H.","family":"Alqahtani","sequence":"additional","affiliation":[{"name":"College of Engineering, Muzahimiyah Branch, King Saud University, P.O. Box 2454, Riyadh 11451, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4665-0095","authenticated-orcid":false,"given":"Rifaqat","family":"Hussain","sequence":"additional","affiliation":[{"name":"Antenna and Electromagnetics Research Group, School of Electronic Engineering and Computer Science, Queen Mary University of London, London E1 4NS, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Akram","family":"Alomainy","sequence":"additional","affiliation":[{"name":"Antenna and Electromagnetics Research Group, School of Electronic Engineering and Computer Science, Queen Mary University of London, London E1 4NS, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2793-2137","authenticated-orcid":false,"given":"Muhammad Qasim","family":"Mehmood","sequence":"additional","affiliation":[{"name":"MicroNano Lab, Department of Electrical Engineering, Information Technology University of the Punjab, Lahore 56000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,1,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"115","DOI":"10.1146\/annurev-marine-121211-172315","article-title":"High-frequency radar observations of ocean surface currents","volume":"5","author":"Paduan","year":"2013","journal-title":"Annu. 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