Abstract
In this letter, the design of a Push-Push and Push-Pull oscillator based on substrate integrated waveguide (SIW) and substrate integrated coaxial line (SICL) technique is presented. Differential-phase lock of the sub-oscillators is realized with the SIW cavity at fundamental <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex Notation="TeX">${\rm TE}_{110}$</tex></formula> mode, thus simplifying the oscillator design procedure. Based on the SIW and SICL technique, a broadband magic-T is utilized for combining the desired signal and cancelling the undesired signal for both Push-Push and Push-Pull output. The prototype of the Push-Push and Push-Pull oscillator is designed and fabricated. Measured results show that the proposed oscillator has <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$f_{0}$</tex> </formula> suppression of <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$-$</tex> </formula> 13.1 dBc at the Push-Push port, and <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex Notation="TeX">$2f_{0}$</tex></formula> suppression of <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex Notation="TeX">$-$</tex></formula> 24.3 dBc at the Push-Pull port. Compared with the conventional single oscillator, the phase noise is improved by 2.5 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\sim$</tex></formula> 3.2 dB at 100 kHz through 1 MHz offset for the desired <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$f_{0}$</tex></formula> and <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex Notation="TeX">$2f_{0}$</tex></formula> output signals.
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