This technology is a design method for a non-periodic CRLH antenna, in which a single ring mushroom with shorting pins is capacitively coupled at regular intervals around a coaxially fed microstrip patch. It increases bandwidth and gain by shifting the -1st order resonance and positive resonance toward the zeroth-order resonance. The resonance points are adjusted by reducing the internal patch area and increasing the ring width while maintaining the overall size.
Conventional zeroth-order resonant antennas, based on periodic DNG/ENG mushroom cell structures, suffer from large footprints and low gain. Furthermore, they offer limited design flexibility due to repetitive design variables. In particular, low-profile zeroth-order resonant antennas capable of horizontal radiation have historically been limited by narrow bandwidths of less than 10%.
This technology reduces the coupling perimeter between the patch and the ring to lower series capacitance, thereby shifting the -1st order resonant frequency upward, while increasing the ring width to boost series inductance, which shifts the positive resonant frequency downward. As a result, the fractional bandwidth expands from an initial 3% to over 30%, while maintaining a monopole radiation pattern and high gain across the entire band. Suitable for wideband wireless terminals requiring horizontal communication, such as vehicles and drones, it allows a single low-profile planar antenna to support multiple service bands simultaneously.
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