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These structures use the well-known principle of Matryoshka dolls that are successively nested inside each other. The well-known advantages of the planar printed technology and of the meandered nested Matryoshka geometries are combined to generate miniaturized, multi-resonance, and\/or wideband configurations. Both metal and complementary slot structures are considered. Closed and open configurations were analyzed. The working principles were explored in order to obtain physical insight into their behavior. Low-cost and single-layer applications as frequency-selective surfaces, filters, antennas, and sensors, in the microwave frequency region, were reviewed. Potential future research perspectives and new applications are then discussed.<\/jats:p>","DOI":"10.3390\/mi15040469","type":"journal-article","created":{"date-parts":[[2024,3,31]],"date-time":"2024-03-31T13:42:30Z","timestamp":1711892550000},"page":"469","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Planar Printed Structures Based on Matryoshka Geometries: A Review"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5437-9093","authenticated-orcid":false,"given":"Alfredo Gomes","family":"Neto","sequence":"first","affiliation":[{"name":"Group of Telecommunications and Applied Electromagnetism (GTEMA), Instituto Federal da Para\u00edba, Jo\u00e3o Pessoa 58015-435, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2106-0734","authenticated-orcid":false,"given":"Jefferson Costa e","family":"Silva","sequence":"additional","affiliation":[{"name":"Group of Telecommunications and Applied Electromagnetism (GTEMA), Instituto Federal da Para\u00edba, Jo\u00e3o Pessoa 58015-435, Brazil"}]},{"given":"Joabson Nogueira de","family":"Carvalho","sequence":"additional","affiliation":[{"name":"Group of Telecommunications and Applied Electromagnetism (GTEMA), Instituto Federal da Para\u00edba, Jo\u00e3o Pessoa 58015-435, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0385-2236","authenticated-orcid":false,"given":"Cust\u00f3dio","family":"Peixeiro","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, Instituto Superior T\u00e9cnico, University of Lisbon, 1049-001 Lisbon, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2024,3,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Moon, S., Khanna, S.K., and Chappell, W.J. 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