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.
In this work, we present a miniature multi-layered patch antenna for K-band applications. The size of the antenna has been optimized by using two substrates layers, introducing a rectangular probe between the layers, and insertion of an air-filled cavity into the lower substrate. Analysis and modeling were performed using the HFSS (High Frequency Structure Simulator) simulator based on the finite...
A novel approach for realizing improved-bandwidth microstrip patch antennas (MPAs) with use of 3-D printed Acrylonitrile Butadiene Styrene (ABS) substrates is presented. By 3-D printing these substrates using the MakerBot Replicator 2X, complex cavity-backed MPA designs typically implemented with subtractive manufacturing techniques such as micromachining are easily adapted without loss of efficacy...
A family of reconfigurable antennas based on stub-loaded substrate-integrated circuits, including a microstrip patch, a substrate-integrated waveguide (SIW) cavity and their variations is presented. The paper summarizes the reconfiguration concept proposed in recent papers and extend its applicability to further substrate-integrated geometries. In addition, the analysis, optimization and results of...
In this paper, the rectangular microstrip antenna is analyzed by using the theory of characteristic modes (TCM). Characteristic modes of microstrip antennas with different shapes of ground are presented to provide physical understanding of the radiating behavior. The microstrip antennas operated at different modes are verified by both HFSS simulated and measured results. Resonance frequency, near...
A theoretical analysis of an annular ring microstrip antenna with metamaterial substrate is presented. The approach is based on the cavity model. By including in the substrate a conventional dielectric material and a metamaterial possessing negative permittivity and permeability, a frequency independent resonance condition is found. Numerical validation of the theoretical results is performed.
The objective of this work is to demonstrate and compare two solutions for increasing the bandwidth performance of cavity type antennas having an aperture size close to half the operating wavelength and placed in a large (infinite) ground plane. As an example, we chose a square cavity geometry with size 0.475 × 0.475 × 0.15 λ0 at 2.3 GHz. To excite the antenna, we placed inside the cavity volume first...
The effect of cylindrical metallic enclosure on the resonant frequency of a suspended annular ring microstrip antenna (ARMSA) is investigated using HFSS simulation software and theoretically calculated using modal expansion cavity model and circuit theory concept. Theoretical result shows close agreement with simulated results. Variation in resonant frequency with air gap height and inner patch radius...
Quality (Q)-factor analysis of reflectarray unit cells is extended to predict performance under parallel plate waveguide excitation, corresponding to normal incidence. Q factors obtained from parallel plate waveguide (PPWG) are compared with rectangular metallic waveguide (RWG), different coupling conditions are discussed, and loss performance is analyzed. A case study illustrates the effects of the...
The use of the microstrip antenna has grown rapidly for the last two decades, because of the increasing demand for a low profile antenna with small size, low cost, and high performance over a large spectrum of frequencies. However, despite the advantages microstrip antennas provide, a number of technical challenges remain to be solved for microstrip antennas toreach their full potential, particularly...
An investigation of microstrip-fed cavity-backed cross slot antennas using an elliptic cavity is presented in this letter. The antenna has two crossed radiating slots printed on the bottom of substrate and an elliptic cavity behind the slots. Two dual-arm microstrip-fed lines are used to excite which are etched on the upper side of the substrate. An elliptic metal sheet is placed at a distance between...
This paper presents a compact, single substrate, active substrate integrated waveguide (SIW) cavity backed patch antenna oscillator. In the last years, the fast development of wireless communications spurred a great demand for low profile antennas. Cavity backed antennas have been widely studied as they offer several design advantages such as increased efficiency due to surface wave suppression, and...
A novel family of substrate-integrated waveguide (SIW) cavity-backed antennas is proposed. The proposed SIW cavity-backed topology has the potential to be used for a bandwidth enhancement where it could widen the inherent limited bandwidth of the conventional patch (typically 2%) to about 10%. Unlike the conventional metalized cavity-backed antenna which requires two fabrication processes; a PCB process...
Radiation efficiency of a microstrip antenna with a height discontinuity (MAHD) is evaluated based on a cavity model. The radiation efficiency of an MAHD is shown to be better than that of a comparable standard microstrip antenna. The field distributions are given to explain how such better efficiency is possible. The numerical results are relatively in good agreement with the simulation results of...
A 2×4 Ku-band cavity-backed microstrip patch antenna array has been implemented using the substrate integrated waveguide technology (SIW) -a low cost multi-layer PCB process. Cavities are emulated using vias and the patches are probe fed using a microstrip feed network. The microstrip feed network is placed in the back of the antennas to reduce the mutual coupling between the feed network and the...
By employing a highly-reflecting surface (HRS) with negative reflection phase as the superstrate and a PEC ground plane (its reflection phase is 180??), the cavity height (d) can be smaller than ??0/4. This paper investigates the minimum cavity height of the small EBG-resonator antennas (42 mm ?? 42 mm ?? d) with PEC side walls, operating at 12 GHz, to achieve the maximum direcitivity (15 dB). The...
In this paper the analysis of a microstrip antenna loaded with a double-negative (DNG) material is shown. The presented results can be applied easily to the design of planar antennas, arrays and frequency selective surfaces (FSS). The advance in planar radiating structure design using non-conventional material with the objective of size reduction is carried out. A DNG material realized with a periodic...
In this presentation, a compact LHM unit cell, which smallest electrical size is only 0.1, is designed. The LHM unit cells are stacked and embedded into a host substrate to construct a phase-compensating substrate for the microstrip antenna (MSA) miniaturization. Results show that the presence of the LHM fillings can indeed greatly reduce the physical dimensions to 0.17 lambda. Moreover, a miniaturized...
In this paper, we present a rectangular waveguide (RWG)/aperture technique intended to couple energy from active devices integrated on a GaAs substrate to patch antennas printed on a low permittivity substrate. By spacing the two substrates apart from each other, it is possible to remove heat from the structure through the metallic waveguide housing. This new approach also promises to reduce the number...
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.