The cognitive radio (CR) opens new paradigms of opportunistic utilization of unused frequency spectrum through spectrum sharing. Dynamic spectrum access (DSA) provides an effective solution to channel congestion with the help of software-defined radio in cognitive radio networks (CRN). Software defined radio (SDR) offers manipulative wide spectrum sensing and reconfigurable transmission properties between licensed primary user (PU) and unlicensed secondary user (SU). The opportunistic spectrum sharing elicits the need for hardware compatibility from a common radiating antenna for extra-large band spectrum scanning. This paper proposes a novel compact antenna for wide spectrum sensing to utilize vacant channel opportunity in wireless cognitive radio sensor network (WCRSN). The antenna design comprises the combinational effects of fractal slots and electromagnetic bandgap structure on compact FR4 substrate 12 × 18 × 1.6 mm². The circular polarization improves the feasibility of antenna for orientation-free scanning of spectrum through corner truncation. The novel antenna design exhibits large measured impedance bandwidth from 0.79 to 12.0 GHz compatible with Zigbee, Bluetooth, GPS, GSM, LoRa, WiFi and other UWB applications. The antenna offers average gain 2.59 dBi over entire operating frequency range and validates compatibility for spectrum sensing in WCRSN as per FCC standards.

认知无线电 (CR) 开辟了通过频谱共享机会主义利用未使用频谱的新范例。动态频谱接入 (DSA) 借助认知无线电网络 (CRN) 中的软件定义无线电，为信道拥塞提供了有效的解决方案。软件定义无线电 (SDR) 在许可的主要用户 (PU) 和未许可的次要用户 (SU) 之间提供可操纵的宽频谱传感和可重新配置的传输属性。机会性频谱共享引发了对用于超宽带频谱扫描的通用辐射天线的硬件兼容性的需求。本文提出了一种用于宽频谱传感的新型紧凑型天线，以利用无线认知无线电传感器网络 (WCRSN) 中的空闲信道机会。² . 圆极化提高了天线通过角截断进行频谱无方向扫描的可行性。新颖的天线设计展示了从 0.79 到 12.0 GHz 的大测量阻抗带宽，与 Zigbee、蓝牙、GPS、GSM、LoRa、WiFi 和其他 UWB 应用兼容。该天线在整个工作频率范围内提供 2.59 dBi 的平均增益，并根据 FCC 标准验证了 WCRSN 中频谱感测的兼容性。