This paper presents a large-area, soft, and stretchable thermistor-based sensor that leverages radio frequency (RF) sensing for wide-range temperature measurement. The thermistor is composed of a flexible and stretchable short carbon fiber incorporated into a Polydimethylsiloxane (PDMS) composite, enabling a wide temperature sensing range (30 to 205 °C) and high sensitivity (3.2 MHz/°C). The RF readout technique overcomes the traditional DC sensing limitations, allowing for direct wireless transmission of temperature data. The composite exhibits excellent stability against bending and stretching, making it suitable for various applications. The RF-enabled thermistor is used as a substrate for sub-6 GHz radio frequency components, such as resonators and antennas, demonstrating its versatility in wireless sensing systems. The paper also discusses the fabrication process, material characterization, and experimental results, highlighting the sensor's performance and potential for practical applications in wearable and implantable sensing devices.This paper presents a large-area, soft, and stretchable thermistor-based sensor that leverages radio frequency (RF) sensing for wide-range temperature measurement. The thermistor is composed of a flexible and stretchable short carbon fiber incorporated into a Polydimethylsiloxane (PDMS) composite, enabling a wide temperature sensing range (30 to 205 °C) and high sensitivity (3.2 MHz/°C). The RF readout technique overcomes the traditional DC sensing limitations, allowing for direct wireless transmission of temperature data. The composite exhibits excellent stability against bending and stretching, making it suitable for various applications. The RF-enabled thermistor is used as a substrate for sub-6 GHz radio frequency components, such as resonators and antennas, demonstrating its versatility in wireless sensing systems. The paper also discusses the fabrication process, material characterization, and experimental results, highlighting the sensor's performance and potential for practical applications in wearable and implantable sensing devices.