Abstract
This paper has designed a micro-power antenna architecture in which a component-based flexible ferromagnetic core is integrated into a coaxial diameter-distributed coil with twisted loop antenna (DDC-TLA). A stereo-crossed distributed winding method is introduced to reduce the paradise capacitance in the DDC-TLA. The magnetic-core components are made of the mixture of Fe/Citrate nanoparticle composite and polydimethylsiloxane solution, they are filled in a flexible rubber substrate to achieve adjustable permeability and wearable flexibility. Based on the above architecture, an optimized algorithm is proposed to reduce power loss while determining the preferable structure of the DDC-TLA and the suitable ingredients of the magnetic core. Finally, simulations and experiments are conducted to confirm its performance in terms of higher quality factor, lower heat loss, and better signal waveform.
Highlights
Micro-power devices, such as integrated circuit cards(ICC) [1], [2], medical devices [3], [4] and onboard units (OBU) [5], [6], are expected to have low heat loss so that they can provide long standby time [7]–[9] and low radiation [10]–[16]
The results show that the quality factors of all the filling ratios are larger than the quality factor of an air-core1 coil (z = 0, Q = 14.95), and different nanoparticle composite and filling content (z) produce different quality factor
The results show that the air-core antenna with the distributed coil with twisted loop antenna (DDC-TLA) is slightly better than the air-core antenna with the single-layer coil, whereas our designed antenna obviously outperforms the other two antennas in terms of quality factor and heat loss
Summary
Micro-power (short distance) devices, such as integrated circuit cards(ICC) [1], [2], medical devices [3], [4] and onboard units (OBU) [5], [6], are expected to have low heat loss so that they can provide long standby time [7]–[9] and low radiation [10]–[16]. A low input resistance can improve the quality factor (Q-factor) of an antenna, enhancing performances such as tag detection [13] and noise suppression [14] It may result in distorted signal waveforms, such as non-monotonous signal damping oscillation [15]–[17], large signal overshoot [18]–[20] and frequency shift [21]. A flexible PCB is rolled or bent into a three-dimension (3D) solenoid substrate with different cross-sectional shape to reduce footprint area [32] Their air-core structures result in relatively low inductance. In order to address these challenges on a multi-layer coil, a coaxial DDC-TLA is proposed to reduce un-uniform flux density, parasitic capacitance, conduction loss, radiating time and stiffness through distributing each layer to a slot with different diameter in an elastic base. The adjustability of inductance and magnetic-field strength can be achieved by modifying the number and distribution of magnetic-core components filled in the coil space
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