Abstract
In this paper, we present a substrate-suspended air cavity resonator featuring high-Q, consisting of five separate layers for confining electromagnetic energy. Its field distribution is analyzed in depth. By appropriately coupling the two resonators, a second-order Chebyshev bandpass frequency selection network is obtained, and design procedure is described. It forms a specific group delay response, in which high values can be achieved within a narrow frequency range around the center frequency. The frequency selection network has great flexibility in adjusting its magnitude and phase responses so that low insertion loss and high group delay are achieved simultaneously. This feature plays an important role in reducing phase noise when it is applied in a microwave oscillator. For demonstration, an X-band oscillator example was designed and fabricated. As the measured results show, it works at 11.16 GHz, and the phase noise at 100 KHz away from the oscillation frequency is as low as −120.68 dBc/Hz.
Highlights
A microwave oscillator acts as a source of microwave signals, which have a significant impact on the performance of wireless communication system
In [6], an frequency selection networks (FSNs) based on a stubs loaded nested split-ring resonator obtains a group delay peak, which is effective for reducing the phase noise of an oscillator
In [7], a low phase noise oscillator based on the harmonic suppression of a stepped-impedance resonator (SIR) filter is proposed, and it achieves low phase noise for the sake of the excellent frequency selection and out-of-band rejection of the FSN
Summary
A microwave oscillator acts as a source of microwave signals, which have a significant impact on the performance of wireless communication system. The fundamental resonance frequency of the SSACR is 11.525 GHz. According to the verification process, first, a rectangular substrate-suspended waveguide is simulated to obtain the phase at the cut-off frequency. It mainly consists of an amplifier, input and output matching network, a bandpass FSN, a phase shifter, and a 3 dB branch line coupler.
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