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We present a novel design of loop-gap resonator, the loop-zag resonator, forsub-X-band electron-spin resonance spectroscopy. The loop-zag design canachieve improved coupling to small-sample spin systems through the improvementof sample filling factor and RF $B_1$ field. By introducing ``zags'' to theresonator's gap path, the capacitance is increased, accommodating a smallerloop size and thereby a larger filling factor to maintain the requisiteresonant frequency. We present experimental spectra on five differentresonators, each with approximately the same resonant frequency of$\sim2.9$~GHz, showing that an increase in the number of zags and reduction inloop size gives rise to higher sensitivity. Finite-element simulations of theseresonators provide estimates of the improved filling factors obtained throughthe addition of zags. The frequency range over which this loop-zag design ispractical enables a breadth of future applications in microwave engineering,including ESR and ESR-like quantum information microwave techniques.

The loop-zag resonator: A loop-gap resonator design for improved sensitivity in electron-spin resonance experiments