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A novel hexa-band internal folded monopole/dipole/loop antenna has been proposed. The proposed antenna has four resonances in which three of them are 0.5λ, 1λ and 1.5λ modes. The distinctive feature of the antenna is an extra 2λ folded dipole mode, which has not been reported so far, is excited and utilized. All these four modes can be employed to cover the Low LTE700/GSM850/900 Band (LB: 698–960MHz)...
This paper addresses two important aspects in the area of RFID technology namely, development of platform tolerant tags and RFID tags and systems in medicine. Firstly, platform tolerant tag designs are discussed. A dual patch/fat folded-dipole type tags (for human monitoring) is described and measurements are performed to validate the performance of the tag in different environments including human...
To investigate the wireless power transfer, we need to analyze the antenna coupling. We derive a Z-parameter between two antennas using spherical modes and the addition theorem. We present formulas that calculate the maximum power transfer efficiency and the optimum load impedance for the antennas generating arbitrary modes. To simplify the formula, we assume that the antennas are canonical minimum...
This paper presents the antenna to enhance DC output of RF energy harvesting system under weak signal reception environment. To select candidate sites and base stations for RF energy harvesting system, we discuss expected reception power level by a simple line-of-sight propagation model and the specification of currently used base stations. Under this site condition, this paper presents a voltage-boosting...
Ferromagnetic wires are proposed to engineer artificial impedance surfaces. The solution to the scattering problem of a grid of wires in the proximity of a ground plane is solved, and explicit expressions for the equivalent surface impedance and reflection coefficient are formulated. Due to the wide variety of electromagnetic effects excited by the wires (magnetoimpedance effect, magnetic dipolar...
In this paper, we present the design of electrically small antennas for biomedical application at 2.4 GHz. Performance of two different antennas built using the Integrated Passive Devices (IPD) technology from STMicroelectronics is investigated. Two monopoles miniaturized with the meandered technique are studied. Their quality factor Qz is calculated from their input impedance and compared with the...
We examine how the bandwidth of artificial magnetic conductors (AMC) can be greatly increased when loaded with negative-inductance Non-Foster circuits. This increase in bandwidth is achieved by enhancing the structural inductance of the AMC by combining it in parallel with a negative inductance, thus achieving a bandwidth that exceeds what is possible with passive approaches. A prototype VHF-UHF active...
A CPW-fed ultra-wideband monopole antenna with X-band rejection filter characteristic is proposed. The proposed rejection filter is obtained by using a stepped impedance resonator (SIR) with inner stub embedded in the CPW fed transmission signal line. The center frequency of the notch band can be controlled by adjusting the dimensions of the stepped impedance resonator and its inner stub. The proposed...
In this contribution, we theoretically and numerically show that the operation bandwidth of an electrically small SRR loaded monopole antenna can be improved by using non-Foster active elements connected to the external gap of the SRR. The circuit implementation of the required non-Foster load in the VHF frequency band, as well as the stability analysis of the whole active component are also presented...
If we are limited to rearranging passive materials such as dielectrics and metals, then the performance of antennas, artificial materials, and other electromagnetic structures that we build will always be determined by the same fundamental limitations that affect today's designs. By including active circuits, it is possible to exceed the limitations of passive structures and to build materials and...
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