Phase-Conjugated Arrays Using Low Conversion-Loss Resistive Phase-Conjugating Mixers and Stub-Loaded Patch Antennas

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Original languageEnglish
Article number4548502
Pages (from-to)1764-1773
Journal / PublicationIEEE Transactions on Microwave Theory and Techniques
Issue number8
Publication statusPublished - Aug 2008


A 1-D four-element and 2-D eight-element phase-conjugated retrodirective arrays employing low conversion-loss resistive field-effect transistor mixers and stub-loaded patch elements are proposed. The mixer, systematically designed using a multiharmonic loading technique, offers a low 5.2-dB conversion loss at a 4.5-dBm local oscillator power level. The stub-loaded patch element is a square patch with a capacitive open stub loaded at each of its four corners, leading to patch-size reduction, lower mutual coupling between adjacent elements, and broader beamwidth. With the same element spacing of half a free-space wavelength at 5.8 GHz, the mutual coupling is suppressed by 3.1 and 3.3 dB in the E- and H-planes, respectively, when compared to the conventional square patches. Within an angle of ±60° normal to the arrays, distinct linearly polarized retrodirectivities in terms of pattern deformations are experimentally confirmed for both the H-plane of the 1-D array and both E- and H-planes for the 2-D array. Additionally, circularly polarized retrodirectivity are also experimentally confirmed for 2-D arrays.

Research Area(s)

  • Low conversion-loss resistive field-effect transistor (FET) mixers, Retrodirective arrays, Stub-loaded patch antennas

Citation Format(s)