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A Novel Notch Antenna Based on Improved Single CSRR

In this paper, a novel Ultra-wideband notch antenna is proposed with a working bandwidth of 3 ~ 11 GHz, which is used trapezoidal microstrip line feed. The dimensions of the antenna is 32 × 25mm2, and the patch has a hexagonal structure. In order to achieve ultra-wideband characteristics of 3 to 11 GHz, impedance matching is achieved by using a trapezoidal microstrip feed line. Using a half-wavelength resonance principle, a half-wavelength U-shaped slot is etched on the hexagonal patch to form a notch in the Wireline Local Area Network (WLAN) band (5.15 ~ 5.85GHz). Introduce an improved single complementary split resonant ring (CSRR) at the trapezoidal microstrip feed line, and add an H-shaped slot at the center of a single split complementary resonant ring. This structure can form a two-stage resonant circuit, achieving double notch characteristics in the downlink frequency band of the C-band communication satellite transmission signal (3.7 ~ 4.2 GHz) and the X-band satellite communication band (7.9 ~ 8.4GHz). By adjusting the size of the slot and the width of the slot, the center frequency of the notch band and frequency band of the notch band can be changed, so the adjustment of the notch is realized. Finally, the antenna achieves bandwidth suppression in 3.70–4.49GHz, 5.03–6.15GHz and 7.52–8.43GHz bands, and the peak points are −0.1dB, −1.25dB and −0.68dB, respectively. The anti-jamming performance is good. Compared with the method of forming double notches mentioned in the previous literature, the design method is simpler, which provides new idea for realizing multi-notch structure in the future.