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A suspended plate antenna (SPA) with L-probe feed is of interest as an efficient non-contacting feed method. It maintains high efficiency even when the plate is constructed of poorly conducting materials such as conductive inks. An SPA is designed at 10 GHz where fabrication tolerances can have an impact on performance. The SPA as designed has 36 percent impedance bandwidth and 8 to 9 dBi of gain...
A suspended plate antenna (SPA) array for a high power application is presented. The application required a compact and light weight antenna with at least 20 percent of impedance bandwidth and 14 dBi of gain as well as a low backlobe over a frequency range of 750 to 850 MHz. A single SPA has a little more than 36 percent impedance bandwidth and 8 to 9 dBi of gain. Forming a 2-dimensional array of...
A novel circularly polarized knot antenna with the conical beam radiation pattern is presented. It consists of a (3, 8) torus knot as a radiator which is excited by a monopole probe. Measured results show that the antenna has an impedance bandwidth of 39.6% covering the frequency range 3.54 GHz to 5.29 GHz and usable axial ratio bandwidth of 26.8%. (3, 8) torus knot antenna is mechanically simple...
Small and multiband antennas are crucial elements for wireless devices. On one hand, the space devoted to the antenna is small due to the presence of other electronic components in the device. On the other hand, the number of frequency bands with the inclusion of 4G is relevant. In order to achieve a small and multiband antenna, a strategy using a non-resonant element in combination with a passive...
One of the most relevant challenges of next generation in-body devices consists in enhancing the medical applications of wireless networks qualitatively. The current standard does not allow high data rate wireless connections between implanted nodes. UWB systems have been considered as a potential candidate for future in-body devices. To establish a proper link within UWB, antenna matching should...
In this paper a highly broadband circularly polarized patch antenna design is shown. The design features several novelties which includes the use of a 3-phase feed circular patch for optimal axial ratio and the 3-phase microstrip feed structure to excite the patch antenna. Combining those techniques provides superior bandwidth in both return loss and axial ratio compared to classical rectangular patch...
Nowadays numerous standards in mobile phones and short range links are emerging. The development of antennas covering all those allowed frequencies with only one element and one feeding appears to be an important goal [1]. For example, base stations for mobiles are mostly composed of different arrays of antennas, each array working for only one band. The purpose of the presented study is to develop...
Measurement techniques in the antenna near-field (NF) region play a significant role in the evaluation of far-field (FF) patterns. In fact, for electrically large antennas, the required size of the conventional FF range becomes prohibitively large. Moreover, the development and the spreading of NF-FF transformation techniques employing planar, cylindrical or spherical scanning systems is justified...
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...
Whip antennas can provide good performance for RF communications, such as cellular telephony, especially when mounted on top of vehicles. Unfortunately, they are not easily integrated into a small handheld chassis. As handheld radios become smaller and more ergonomic, the whip antenna represents a growing inconvenience to the user. This paper describes one member of a new family of antennas under...
The techniques for reconstructing antenna radiation patterns from near-field (NF) measurements have been widely investigated in the last decades and used for applications ranging from cellular phone antennas to large phased arrays and complex multi-beam communication satellite antennas. They have been proved to be an efficient and attractive alternative to conventional far-field (FF) range and compact...
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...
A reflectarray antenna composed of double cross loop elements of varying arm length printed on a conductor-backed substrate is introduced. Two different realizations are presented: in the first design, the lengths of both constituent arms of the cell elements are varied whereas the length of only one of the two arms is varied in the second design. Prototype reflectarrays were fabricated and measured...
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.
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.
Properties of a novel broadband printed antenna element, printed counterpart of the conventional TV UHF panel antenna with very large bandwidth, has been studied. A design method and realization is presented in the paper. More than one octave measured bandwidth with VSWR less then 1.8 and directivity between 9.0 and 11.0 dBi has been achieved. Properties of the radiator as an array element have also...
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%.
Millimeter-wave/terahertz rotational spectroscopy offers ultra-wide-detection range of gas molecules for chemical and biomedical sensing. Therefore, wideband, energy-efficient, and fast-scanning CMOS spectrometers are in demand. Spectrometers using narrow-pulse sources and electromagnetic scattering [1] are broadband, but their resolutions do not meet the requirement (<10kHz) of the absolute specificity...
This paper presents a printed UWB antenna with notched bands. To reduce the EMI at 3.5 and 5.5 GHz, two invert L-shaped narrow slits embedded into both ground planes and modified U-shaped narrow slit embedded into radiating patch are applied for band notching of those bands, respectively. The proposed antenna provides operating frequency ranges of 3.1–3.3 GHz, 3.8–5.2 GHz and 5.9–12 GHz. Nearly omni-directional...
In this paper, a hybrid Z-shaped dielectric resonator antenna (DRA) design is proposed. Conformai strip feeding is utilized to feed the antenna. It is observed that by use of two different DRA materials, Q-factor can be reduced and in turn ultrawide bandwidth (UWB) can be achieved. A rigorous parametric study is carried out to optimize the bandwidth of proposed antenna while maintaining its compactness...
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