The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We have proposed an open terminated folded inverted-L antenna (FILA) with slits. In order to miniaturize the FILA, several slits are employed on the substrate surface. Folded structure is used for broadbanding. Design of the FILA to achieve broadband characteristics is shown. Simulation and measurement are implemented, and comparison of the results are evaluated. Finally, we calculate the product...
Meta-surface inspired antenna (called MACKEY) which works not only in free space but also on metal plates, was proposed. In this paper, a dual-band MACKEY device, in which the position of the dipole antenna is changed from the center of the substrate, is proposed. Additionally, the conditions for controlling the resonance frequencies are clarified.
We have studied a high impedance antenna in order to improve the rectifier efficiency for energy harvesting applications. Folded dipole antenna (FDA) with high impedance of over 10 kΩ is proposed. To obtain higher impedance stepup ratio compared with the conventional FDA, an FDA consisting with three strip conductors is investigated. Impedance stepup ratio is calculated and the results in theory,...
This paper provides a dual-band / wideband MACKEY with a dipole element setting at the offset position away from the center (MACKEY type O) will be proposed.
In this paper, aberration theory will be introduced to estimate the frequency characteristics of reflectarrays. By introducing aberration theory, the mechanisms of the frequency characteristics of the beam squint and the phase errors on the aperture will be qualitatively clarified. The validity will be quantitatively verified by simulations.
Antennas installed on various domestic appliances should be small and not influenced by the background metal. Small antenna metamaterial antenna chip developed by KIT EOE laboratory (MACKEY) is a composite structure consisting of a metal plate loaded capacitance grid realized using an artificial magnetic conductor (AMC) substrate and a dipole antenna. It can be installed on a conducting plate without...
In this paper, the broadband conditions of a reflectarray antenna will be shown using aberration theory. By using aberration theory, the mechanism of the frequency characteristics of the beam shift and gain reduction will be clarified. Further, a method for the mirror surface is described to become wide band. The validity is verified by an analysis and a theoretical formula.
An open terminated folded inverted-L antenna (FILA) is investigated for the theoretical limitation based on the product of bandwidth and radiation efficiency (Bη product). The FILA consists of two strips without connecting point and two slits on the strips are employed to miniaturize. Aspect ratio of the FILA is chosen as 1 : 2 that the horizontal arm has double the length of the vertical strip. Electrical...
We demonstrated the high efficiency on the rectenna which is composed of the high impedance antenna and the optimized gate controlled diode (GCD), for RF energy harvesting. It was clearly shown that the high impedance and the cancelation of the parasitic capacitance (Cj) of the diode improve the rectification efficiency, by using the fabricated transmission line module. The rectification efficiency...
A small antenna MACKEY (Metamaterial Antenna Chip developed by KIT EOE LaboratorY) consists of substrates that are metal plate loaded capacitance grids using AMC (Artificial Magnetic Conductor) substrate and dipole antenna is showing a characteristic distribution from the principle of operation, it is possible to be installed on a metal plate without affecting the characteristics of impedance and...
In this paper, the 500MHz band low power rectenna with high sensitivity characteristic is described. The rectenna is consisting of the folded dipole antenna with a 1.6kΩ impedance and the Cockcroft-Walton type rectifier for improvement of the rectification efficiency and the output dc voltage. Furthermore an L-Type LPF is added to reduce the negative influence due to the junction capacitance of the...
Various domestic appliances that can use WiFi are becoming more common. Therefore, it is necessary to establish a design method for installing a small antenna within these appliances. In this paper, a model that has a dipole antenna unified with an artificial magnetic conductor (AMC) substrate inspired small antenna is proposed, and its radiation and impedance characteristics are shown.
In this study, we present a simple equation to calculate the reflection phase of a metal plate loading Frequency Selective Reflector (FSR) with a diagonal incident wave. In addition, we demonstrated that a simple equation described these waves based on the results of measurement of the metal plate loading FSR and calculation results using the method of moments (MoM).
This paper proposes a design method for a low-cross-polarization reflectarray antenna. In this paper, the mechanism of cross polarization is clarified and a design method for a reflectarray antenna with low-cross-polarization is shown. The validity of the design method is verified through simulations and measurements.
A method to reduce the cost of a phased array antenna involves the use of subarrays composed of several element antennas and the installation of a phase shifter to each subarray, rather than to each element antenna. In this method, it is important to suppress grating lobes because the periods of the subarrays are usually large compared with the wavelength. This paper proposes an aperiodic array antenna...
This paper proposes a new circuit model for E-shaped patch antennas (ESPA) using the multiconductor transmission line mode theory (the modal theory). First, radiation and transmission line modes generated on the ESPA are described, and an equivalent circuit is derived from the modal theory. The equivalent circuit is analyzed in detail to obtain wideband and multiband characteristics. For wideband...
Autonomous systems are important for realization of the sensor network. The RF energy harvesting is one candidate of the power source for the systems. It extracts the electric power from the electromagnetic waves which exist environmentally [1]. We have chosen the wave of the Digital Terrestrial Television (DTTV) which frequency is around 500MHz, because the covered area and the expected power will...
In this paper, analysis on the linearity of the balanced diode mixer driven by the square wave LO is described For the objective, the circuit analysis based on the diode model with the ideal switch and the resistor is indicated and the derived formula clarifies the linear operation under some conditions. Furthermore the normalized output powers and the third order distortion of the mixer are demonstrated...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.