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Integrated Slotted SIW Oscillator-Antenna Based on the TE210 Mode with High Spectral Purity.

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Title: Integrated Slotted SIW Oscillator-Antenna Based on the TE210 Mode with High Spectral Purity.
Authors: Sellidj, Abdelmounim1 asellidj1@usthb.dz, Djerafi, Tarek2, Gaoua, Said1, Yagoub, Mustapha C. E.3
Source: Progress in Electromagnetics Research Letters. 2026, Vol. 130, p23-27. 5p.
Subjects: Substrate integrated waveguides, Slot antennas, Antennas (Electronics), Quality factor, Signal generators, Phase noise, Waveguides
Abstract: In this work, a Substrate-Integrated Waveguide (SIW) cavity-based positive-feedback oscillator integrated with a slot antenna on a single substrate was designed. The proposed design incorporates a radiating element, an oscillator tank, and a coupling structure within the same cavity, thereby eliminating external interconnections and significantly enhancing overall efficiency. By employing the T E210 mode instead of T E110, the design exploits a field node to minimize the parasitic loading effects of the oscillator coupling probe on the antenna radiation. This approach simultaneously enhances the cavity's quality factor Q and preserves the spectral purity of the integrated SIW antenna-oscillator, all this without affecting the antenna radiation. The SIW cavity achieves a measured quality factor Q of 250, ensuring high spectral selectivity at the 10 GHz resonant frequency. The oscillator exhibits low phase noise of -131, dBc/Hz at a 1 MHz offset, along with exceptional suppression of harmonics, including the total suppression of the third harmonic, while the slot antenna achieves a gain of 6 dBi. This fully integrated architecture delivers performance equivalent to discrete implementations while offering a compact footprint and eliminating insertion losses between the antenna and the oscillator. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:In this work, a Substrate-Integrated Waveguide (SIW) cavity-based positive-feedback oscillator integrated with a slot antenna on a single substrate was designed. The proposed design incorporates a radiating element, an oscillator tank, and a coupling structure within the same cavity, thereby eliminating external interconnections and significantly enhancing overall efficiency. By employing the T E210 mode instead of T E110, the design exploits a field node to minimize the parasitic loading effects of the oscillator coupling probe on the antenna radiation. This approach simultaneously enhances the cavity's quality factor Q and preserves the spectral purity of the integrated SIW antenna-oscillator, all this without affecting the antenna radiation. The SIW cavity achieves a measured quality factor Q of 250, ensuring high spectral selectivity at the 10 GHz resonant frequency. The oscillator exhibits low phase noise of -131, dBc/Hz at a 1 MHz offset, along with exceptional suppression of harmonics, including the total suppression of the third harmonic, while the slot antenna achieves a gain of 6 dBi. This fully integrated architecture delivers performance equivalent to discrete implementations while offering a compact footprint and eliminating insertion losses between the antenna and the oscillator. [ABSTRACT FROM AUTHOR]
ISSN:19376480
DOI:10.2528/PIERL26012201