©, 2014, Chinese Institute of Electronics. The die area is 1. A passive harmonic tag for buried assets localization is presented for utility localization. The design criteria for the noise-cancelled electronics are discussed, including the problem of excess noise. Finally, experiments with a prototype of the tag are performed for different soil conditions. Wireless power transmission is studied using a rectifier a fundamental tag building-block for which there has been a proven prediction model developed.
Proposed is a theoretical analysis of possible backscattering modulations, as well as an experimental procedure to measure how the impedance modulation at the tag side, affects the signal at the reader. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now know or hereafter developed is forbidden, The use in this publication of trade names, trademarks, service marks and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. A low-cost reader based on a software defined radio is also presented. Included is an experimental procedure to measure how impedance modulation in the tag affects the signal at the reader, and a useful tool for choosing the most appropriate impedances. Taking into account the complexity and subtleties of active cancellers, the addition of an active canceller should be carefully considered.
Proposed is a theoretical analysis of possible backscattering modulations, as well as an experimental procedure to measure how the impedance modulation at the tag side, affects the signal at the reader. Small, narrow band antennas with high radiation efficiency can be utilised with an adaptive tuning of the antenna. . In addition to a theoretical study, we perform experiments with various components e. At the same time, input compression point of +15 dBm is achieved.
By simulati on and prototyping test, the results of leakage power of improved circulator are given. The proposed blocker filtering deploys the concept of blocker injection through feedforward or feedback paths to create arbitrary narrowband notches for the out-of-band blockers, while not affecting the gain of the desired signal. © The Korean Institute of Electromagnetic Engineering and Science. The proposed reconfigurable directional coupler showed an improvement in the isolation characteristics of more than 20 dB at the operation frequency band. Therefore, two measures are proposed in this paper to solve this problem. This letter proposes a reconfigurable directional coupler that uses a variable impedance mismatch reflector to achieve high isolation characteristics in the antenna front end. However, these previously proposed structures impose a large size and design complexity to achieve the required leakage suppression.
Finally, a complete tag design achieving a read range of 12 m at 2. Measured loop frequency responses are in agreement with simulation results obtained with the proposed model. Results from sea trials are presented Balanced topology in radar front-end is presented, which can reduce Tx leakage to receiver drastically. Since the isolation of the Lange coupler is 19 dB, the additional cancellation due to balanced topology is expected to be 21. The operation of the device is based on a reflection from a variable load, which is connected to a port of a hybrid coupler. Time and money may well be better spent by increasing the dynamic range of the receiver front end instead. The small size of the module including the antenna enables integration to mobile phones.
Further, we calculate the average suppression gain of leakage cancellers which enables us to upper-bound the noise effective cancellation gain which directly relates with the reverse link limit. Selection of the load impedance by the reflector allows cancellation of the reflected signal due to antenna load mismatch and the leakage from the input to isolation port of the directional coupler, resulting in high isolation characteristics. This book proposes a linear two-port model for an N-stage modified-Greinacher full wave rectifier, predicting the overall conversion efficiency at low power levels where the diodes are operating near their threshold voltage. The different parts of the system are presented, and the theoretical read range is estimated as a function of the soil composition and the water content. The level of the remainder signal at very low dif- ference frequencies is ultimately determined by the demodulator and integrator offset voltages. Furthermore, measured cancelation ratios for leakages of different ramp rates comply with the normalized power gain at corresponding frequency offsets.
The peak output power is 0. In this letter, a compact monostatic antenna module with Tx-to-Rx isolation optimized by on-board reconfigurable leakage canceller and balanced antenna structure is presented. Compared to conventional method which uses vector modulator, this paper presents a passive carrier suppression method achieving low noise. We can also adjust the number of electrons, which is one of the important parameters in my theory. The self-interference of monostatic structure is managed by a directional coupler with impedance mismatch Γ reflector integrated into the antenna module with small area occupation.
It is found that the long range detection performance and dynamic range of a radar is always degraded with the addition of an active canceller and that the attainable improvement in dynamic range for nearby targets is minimal. Includes a procedure for measuring how impedance modulation in the tag affects signal at the reader, and other useful tools. Active tags require an internal power source, while passive tags do not. Wireless power transmission is studied using a rectifier a fundamental tag building-block for which there has been a proven prediction model developed. In this paper, to avoid such disadvantages, a reflection type low phase-shift attenuator has been designed and measured. This book proposes a linear two-port model for an N-stage modified-Greinacher full wave rectifier, predicting the overall conversion efficiency at low power levels where the diodes are operating near their threshold voltage.
Included is an experimental procedure to measure how impedance modulation in the tag affects the signal at the reader, and a useful tool for choosing the most appropriate impedances. The adaptivity also increases immunity to environmental changes, like detuning of the antenna by user hand. The adaptive system ensures high isolation up to an antenna return loss of 6 dB, or reflection coefficient of 0. Also, quadruple inverted-F antenna is adopted to minimize the effect of antenna load variation and reduce the overall module size. Average Tx-to-Rx isolation is about 40.