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In this paper, extremely subwavelength evanescent Bessel beam launchers are designed, simulated, and experimentally tested to generate nondiffracting beams. The launching apertures consist of several concentric coils strategically positioned to spatially filter the fields of a single actively fed radiating coil. The geometrical properties of each coil element of the aperture were obtained through...
The isolation between Tx and Rx port is essential for long range backscatter communication. Coupler has long been used to isolate transmitter and receiver ports but isolation offered by a microstrip coupler is limited. This work proposes a transceiver system at 2.45 GHz with an isolation better than 75 dB between transmit and receive ports. The system comprises of novel arrangement of power dividers,...
This paper presents a design of a high efficiency RF-DC converter which can operate at an RF input power of −20 dBm (10 µW) at 2.4 GHz. The design is done in UMC 130nm MM/RF CMOS technology. RF to DC Power Conversion Efficiency (PCE) is considered as the performance metric. Fully Gate Cross-Coupled Rectifier (FGCCR) is used for RF-DC conversion, impedance matched to 50 Ω and the circuit parameters...
This paper presents a design of a high efficiency RF-DC converter which can operate at an RF input power of −20 dBm (10 µW) at 2.4 GHz. The design is done in UMC 130nm MM/RF CMOS technology. RF to DC Power Conversion Efficiency (PCE) is considered as the performance metric. Low Vth NMOS based Dickson Charge Pump(DCP) is used for RF-DC conversion, impedance matched to 50 Ω and the circuit parameters...
Radio frequency backscatter involves the modulation of antenna load with the message signal. The information content of the message signal appears in the amplitude of the reflected signal from the antenna. The message can either be a digital signal or an analog signal. The former results in a digital backscatter communication while the latter results in an analog backscatter communication. In this...
A novel technique to transmit identification and sensor information measured at the tag to the reader. The proposed system incorporates a technique to avoid collision in multi-tag environment without increasing complexity of the reader. The proposed device presents a novel idea to modulate a sensor and identification information in a single spike. It has ability to operate at low power as the system...
A time-frequency localization-based implementation of a novel technique to transmit identification and sensor information measured at the tag to the reader is presented. The proposed device presents a novel idea to modulate a sensor and ID information in a single spike. It has the ability to operate at low power as the system uses the proposed spike modulation technique with an analog backscatter...
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