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Low temperature co-fired ceramic (LTCC) is a multilayer material used for system packaging. It offers many advantages in high density integration for RF to millimetre-wave integrated circuits [1]. It is therefore an attractive technology for packaging phased array modules, where the size is an important issue especially at millimetre-wave frequencies [2]. The circuits realised with other processes,...
The rectangular microstrip patch antenna with V shape slot is presented in this paper (Fig. 1). With this new configuration 33.5% impedance bandwidth with stable radiation pattern is achieved.
A theoretical study is presented of the input impedance and bandwidth of biconical microstrip antennas asymmetrically excited by a coaxial probe feed. The antenna consists of a conducting cone cap on a grounded cone separated by an electrically thin dielectric. The structure is of biconical type. The analytic results for zero order modes (including the special case, TEM mode) of the biconical structure...
The usefulness of broadband impedance matching to increase the bandwidth of a microstrip patch antenna is illustrated using three different antenna configurations. Measured data for a patch antenna was incorporated into commercial CAD software to design a matching network. Design limitations are also discussed. Practical design examples and experimental results are given which clearly demonstrate...
Microstrip antennas have been widely used during the past four decades due to mechanical and economical advantages. The rigorous analysis of the microstrip antenna involves the solution of an electric field integral equation (EFIE) whose kernel must account for the effect of the dielectric slab. In this paper a simple approach for determining input impedance and resonant frequencies of microstrip...
Microstrip ring antennas are investigated numerically and experimentally. Depending on their selected geometry, they provide additional parameters that can be used to control their resonant frequency and impedance. Methods for improving their bandwidth and cross-polarization are also investigated.
The design procedure for a low-loss wideband microstrip patch antenna to be used as the key element for an indoor phased array is adressed. For these indoor communications systems, wideband elements are required to support multimedia transmission and to minimize the requirements for external circuitry. A microstrip patch with stacked structures has been developed using the FDTD method and the results...
Interest in the use of microstrip patches for array antennas has prompted investigations into numerous feed mechanisms. One of the most interesting, which offers considerable advantages over the others, is aperture coupling. In the paper that follows, the coupling of a feedline to a rectangular patch, through an aperture in the ground plane separating them, is described. Modal field expansion is used...
A theoretical and experimental study of the patch antenna input impedance variation with feedline width is presented. Measured results were compared with some of the currently available numerical models. A limitation of these numerical models was established and the techniques will be modified to overcome this shortcoming.
The concept of high-impedance electromagnetic band-gap (HI-EBG) structures has been introduced in [1]. Several applications of these structures in antenna design and performance enhancement have been reported in [2]. Recently, more attention has been paid to high impedance surfaces (HISs) and their applications in the light of artificial magnetic conductor (AMC) concept [3].
A moment method solution for the Electric Field Integral Equation is used to analyse a rectangular patch air-dielectric microstrip antenna on an infinite size ground plane. The patch surface is modelled by surface patch modes. The mutual impedance between the surface patch modes are calculated using a simple formula. The effect of the fringing field at the edges of the rectangular patch is derived...
This paper presents some original results on mutual coupling between two identical stacked microstrip antennas. The mutual coupling is calculated by using the reciprocity theorem in the Spectral Domain. The theoretical results are in good agreement with experiments. As expected, we observe that the mutual coupling between stacked patches is stronger than that between unstacked patches.
Electromagnetically coupled (EM fed) microstrip patches have their feed structure fabricated on a thin substrate located between the patch antenna and its ground plane as shown in Figure 1. This dual layer design has two main advantages over conventional single layer microstrip antennas. First, spurious radiation from the feed network can be reduced by decreasing the height and increasing the dielectric...
The dual-polarized patch element is useful in indoor wireless networks for broad bandwidth and modest gains. The focus of this paper is placed on an inset matching network used with a patch element. The purpose of the design is to increase the bandwidth of a microstrip patch by using a thicker substrate with low dielectric constant. However, with such a combination, the input impedance of the antenna...
This paper describes the design and development of a low profile phased array suitable for INMARSAT Standard-M vehicular satellite communications. The array consists of twelve dual layer elements symmetrically positioned on a circular disk. The lower microstrip patches are fed directly to radiate right-handed circular polarization while the upper patches act as parasitic elements. Optimization has...
The analysis of microstrip structures has received a great deal of attention from many different researchers [1],[2]. Of particular interest is the Mixed Potential Integral Equation (MPIE) formulation as presented by Mosig and Gardiol [1]. This method exploits the continuity equation to develop an integral equation in terms of both surface current and surface charge densities. The solution scheme...
A new ring coupled triangular microstrip antenna has been investigated experimentally. The measured bandwidth of the proposed antenna is obtained 309 MHz (7.14% at fo = 4.33 GHz), which is 4 times the band width of the corresponding triangular patch antenna. The gain of the antenna is 3 dB and cross polar level is better than 12 dB within the impedance bandwidth of 7%.
A Broadband Microstrip U-slot antenna with improved impedance bandwidth has been presented. The measured impedance bandwidth of a reflection coefficient in −10dB ranges from 1.22 to 3.77 GHz and thus covers most of the commercial wireless communication systems, such as SDAR(2.32–2.35) GHz, WLAN(2.4–2.5) GHz, PCS(1.8–2.0) GHz. To achieve compact size the square patch is embedded with a U-slot, and...
In the design of two-dimensional microstrip antennas, comparing with the end feeding, the center feeding has advantages of wide frequency bandwidth due to decreasing long line effect and low loss due to the shorter length of the feeding line. However, the area of center feeding circuit forms no radiation area around the center, which causes growing sidelobes. A two-microstrip-output waveguide-transition...
In this paper, a novel wireless power transmission (WPT) system composed of microstrip coils with ferrite and dielectric layers is proposed. The structure of each microstrip coil includes a loop one placed outside and a spiral one put inside. It would be concluded that the transfer efficiency of the proposed WPT system with load of 50 Ohm can get up to around 59.7% at the resonant frequency of 13...
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