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A coupled-fed monopole antenna with a multi-arm structure for GSM900/GSM1800 / DCS / PCS / UMTS / LTE2300 for USB dongle is presented. The monopole is fed by 50-ohm mini coaxial cable line. The two arms are on the front side and a meandered arm extended from the front side by via is on the back side. The multi-arms are coupled by an inverted L strip connected to feed point. The arms resonance of the...
In this paper, we identified line of sight (LOS) by cross polarization discrimination (XPD). We analyzed the propagation characteristic by the Finite Difference Time Domain (FDTD) method, and statistically evaluated the performance of the LOS identification based on XPD. As a result of the evaluation, we found it is difficult to obtain sufficient identification performance only by XPD. Therefore,...
A novel quadruple feeding mechanism for a rectangular patch antenna is proposed. A successive phase shift caused by path inequality between four possible symmetrical feeding points is introduced, in order to achieve wideband operation at the 2 GHz frequency band. This work is an extension to the idea of acquiring a pair of resonances and forcing them to behave in a consolidated way. This concept is...
A compact implantable printed meandered folded dipole antenna with a volume of 101.8 mm3 and robust performance is presented for operation in the 2.4 GHz medical ISM bands. The implant antenna is shown to maintain its return loss performance in the 2360–2400 MHz, 2400–2483.5 MHz and 2483.5–2500 MHz frequency bands, simulated in eleven different body tissue types with a broad range of electrical properties...
Accuracy and efficiency are two important objectives of modeling ground penetrating radar (GPR) signal. Achieving both together is a driving factor for advanced research in the state of art for GPR community. Full wave model (FWM) promises great accuracy to detect layered media. However time efficiency of FWM is poor compared to other simplified models. This work presents a new plane wave model (PWM)...
Limiting mobile phone usage while maintaining a viable communication link for the emergency services can be crucial for secure facilities such as prisons. This paper presents the design of an inductive frequency selective surface (FSS) with a pass-band operating from 380 to 420 MHz covering the TETRA frequency band used by emergency services in Europe. The FSS is designed to attenuate signals in the...
This paper proposes an identification methodology to distinguish between pure and adulterated palmyrah palm juice. The resonance behavior of the palmyrah palm juice has been investigated through numerical electromagnetic simulation. From the scattered response, the natural frequencies of the palmyrah palm juice are extracted. The identification can be performed by cataloging and comparing these pre...
Performance characteristics of Electrically Small Antennas are limited by fundamental physics. Using Non-Foster elements into antennas structures appears like an opportunity to overshoot those limits. In this paper, a Negative Impedance Converter circuit is designed for antenna applications at 868 MHz. These active circuits, that produce Non-Foster negative capacitance or inductance, are known as...
Performance characteristics of passive electrically small antennas are limited by fundamental physics. Using active elements into antenna structures appears like an opportunity to overshoot those limits. Non-Foster elements are classically used in matching networks for electrically small antennas in order to increase their impedance matching bandwidth. In this paper, Non-Foster elements are proposed...
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