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The manufactures of SA usually offer expensive harmonic mixers where frequency extension is needed. In this work, low\u2010cost designs of 2\u2010port and 3\u2010port W\u2010band 8th harmonic mixers covering 75\u2013110\u2009GHz are proposed, and design method of two port mixer without frequency diplexer to separate local oscillator (LO) and intermediate frequency (IF) signals are first presented. These two kinds of mixers are compatible with almost all the current SAs with frequency extension options, which provides LO for the external harmonic mixer. The mixers are designed with planar microstrip lines and antiparallel Schottky diodes. The circuit of 2\u2010port mixer includes the input broadband bandpass filter, diodes, output lowpass filter, and matching circuits. As for 3\u2010port mixer, only an extra diplexer is needed to separate the IF signal and LO signal. The diplexer is composed of a planar semi\u2010lumped lowpass and a highpass filter. The planar circuits are easily fabricated with low\u2010cost print circuit board process on polytetrafluoroethylene substrate. The measured conversion loss of 2\u2010port 8th harmonic mixer is from 20 to 26\u2009dB, and 23 to 28\u2009dB for 3\u2010port mixer at full W\u2010band. The good measured results indicate the proposed mixers are simple and effective.<\/jats:p>","DOI":"10.1049\/2023\/8196039","type":"journal-article","created":{"date-parts":[[2023,10,24]],"date-time":"2023-10-24T06:11:02Z","timestamp":1698127862000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Design of Low\u2010Cost Full W\u2010Band 8th Harmonic Mixers for Frequency Extension of Spectrum Analyzer"],"prefix":"10.1049","volume":"2023","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8105-2934","authenticated-orcid":false,"given":"Jian","family":"Guo","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-7692-861X","authenticated-orcid":false,"given":"Kaiyi","family":"Zang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-5140-1838","authenticated-orcid":false,"given":"Zihan","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-6921-0078","authenticated-orcid":false,"given":"Liang","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3235-8640","authenticated-orcid":false,"given":"Jie","family":"Xu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5666-4023","authenticated-orcid":false,"given":"Zhengbin","family":"Xu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"265","published-online":{"date-parts":[[2023,10,23]]},"reference":[{"key":"e_1_2_8_1_2","unstructured":"SchneiderbangerD. 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