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This paper presents an overview of the advances in single layer reflectarrays. In particular, it reports the progress in wideband reflectarrays and reconfigurable reflectarrays.
Recently, there has been an increasing interest in the THz gap due to the attractive applications that can be developed. Among these applications, high data rates communication system links get an important relevance due to the potential high bandwidth that can be obtained. In this paper, a frequency tripler and a fourth harmonic mixer for a wireless communication link at 300 GHz has been designed...
Two sequentially rotated, four stage, wideband circularly polarized high gain microstrip patch array antennas at Ku-band are investigated and compared by incorporating both unequal and equal power division based feeding networks. Four stages of sequential rotation is used to create 16×16 patch array which provides wider common bandwidth between the impedance matching (S11 < −10dB), 3dB axial ratio...
3×3 Split Ring resonators with inner ring rotation are etched at the back side of Circular microstrip antenna with elliptical rings. Rotation for multiple angles leads to an enhancement in impedance bandwidth. The selected UWB antenna has fabrication dimensions of 45 mm × 31mm × 1.27 mm. The rotation of the inner rings occur clockwise and counter clockwise for −47°, 33° and 10°. The preferable enhanced...
Two dielectric resonators antenna (DRA) fed through slotted microstrip line for a wideband application is proposed. The two cylindrical DRs are asymmetrically situated with respect to the rectangular coupling aperture center with a defected ground plane. By optimizing the design parameters, two antenna configurations have been achieved: the first covering an impedance bandwidth of about 57%, from...
In this paper, two different designs of 3-element planar Yagi-Uda antenna based on the shape of driven and reflector elements are studied. To feed the driven element of Yagi-Uda antenna, a tapered microstrip balun is designed, which converts unbalanced coaxial feed to balanced microstrip line feed. Measured results of both the antennas are compared and it is shown that a planar Yagi-Uda antenna using...
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.
The single layer U-slot rectangular patch antenna has been found to provide impedance bandwidth of about 30% [1]. A bandwidth of up to 40% is obtained with a U-slot patch antenna stacked with a parasitic patch [2]. In this paper the effect of second U-slot stacked with the same geometry is presented, Fig. 1. A bandwidth as high as 46% is obtained.
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...
In general, despite the seemingly many advantages of the microstrip reflectarrays, one of the most serious shortcomings of these devices is the issue of limited bandwidth [1]. To improve the bandwidth of the variable-patch-size microstrip refiectarray, the variation in the patch size must be studied more thoroughly so that its phase variation properties, and thus its bandwidth characteristics, can...
In this paper the design of a high-gain planar antenna is presented. The antenna is designed to operate at 15GHz and has 24dB directivity. This design basically consists of four high-gain Yagi-Uda arrays, which are placed in parallel on a broad-side configuration and are excited uniformly through a feed network. The feed network and the antenna elements are all printed on the same substrate with the...
A new technique is developed to best locate the coaxial feed of a circularly polarized stacked microstrip antenna (CPSMA) with the objective of improving the axial-ratio (AR) bandwidth and CP quality of the antenna. In the proposed technique, we move the single feed on an arc between the diagonal and main axis of the driven patch to optimize CP performance. An antenna based on this technique has been...
We have proposed and discussed a dual-spiral slot as a circularly polarized radiation element with a simple feeding system [1]. The dual-spiral slot located in the x-y plane, as shown in Fig. 1(a), has different radiation patterns in the x-z and y-z planes, due to its dual-element configuration. When the same radiation pattern is required in the x-z and y-z planes, the dual configuration is changed...
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...
It is well known that the bandwidth of a microstrip antenna can be increased by overlaying a parasitic element or director. A radioelectric model was presented [l] to explain this property in the case of a rectangular patch antenna. The purpose of this communication is a generalization of the analysis for an arbitrary shape symmetrical patch antenna coupled with a director. A quasi TEM two coupled...
The Microstrip reflectarray has been identified as one of the enabling technologies to achieve low mass, conformal mounting, wide-angle beam scanning, etc. [1] for NASA's future spaceborne high-gain antennas. It combines some of the best features of microstrip array antenna technology and the traditional parabolic reflector. Recently, the reflectarray antenna has found another horizon. It has the...
A rigorous analysis of an aperture-coupled stacked microstrip antenna is described. Developed from a coupled integral equation set employing spectral-domain Green's functions, the analysis includes all coupling, radiation and surface-wave effects. Optimization of the patch dimensions yielded VSWR bandwidths of greater than 20%. Theoretical and measured responses exhibited excellent agreement.
This paper investigates a novel multi-segment dielectric resonator antenna (DRA). The antenna consists of a thin segments of different permittivity material bonded to the underside of a rectangular dielectric resonator segment. The multi-segment DRA element is excited by a microstrip line. The permittivity and thickness of the segments are used to concentrate the fields of the micro-scrip line and...
We present an analog system capable of undistorted temporal magnification and compression of an arbitrary time-windowed electrical signal. The system is composed of three low-loss, high dispersion microstrip elements and an analog multiplier. Simulation results are presented demonstrating the 5X magnification of a 0.6 ns signal.
This paper describes the design of a low cost 4-bit switched line phase shifter microwave integrated circuit (MIC) on a 10 mil Alumina substrate. Schiffman coupled lines were used to implement each of the 4 bits. These coupled lines provide a dispersive phase response which can be used to produce a relatively constant phase shift over a large bandwidth. Over the 4–8 GHz frequency range, initial measurements...
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