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 are presenting the design of a high gain printed antenna array consisting of 420 identical patch antennas intended for FMCW radar at Ku band. The array exhibits 3 dB-beamwidths of 2° and 10° in H and E plane, respectively, side lobe suppression better than 20 dB, gain about 30 dBi and VSWR less than 2 in the frequency range 17.1 – 17.6 GHz. Excellent antenna efficiency that is between 60 and 70...
A single layer wideband SIW-fed differential patch array is proposed in this paper. A SIW-CPS-CMS (substrate integrated waveguide - coupled lines - coupled microstrip line) transition is designed and has a bandwidth of about 50%, covering the E-band and W-band. The differential phase deviation between the coupled microstrip lines is less than 7.5° within the operation band. A 1×4 array and a 4×4 array...
In early design stages of connected array radiators, passive evaluation using reflected illumination of test coupons without feed electronics provides a quick and inexpensive validation of design models. Inherent in the measurement setup are assumptions about array antenna behavior and acceptable approximations. Particular questions include the minimum number of unit cells necessary to adequately...
Current trend of greater mobility of wireless communication devices has stimulated designs of portability to be at the forefront of manufacturer's interest.
A Ku-band, electronically-steerable, artificial-impedance-surface antenna (AISA) was designed, fabricated and measured. It is capable of scanning in elevation from −70° to 80° with gain variation of less than 5 dB. The antenna operates by launching a surface wave along a surface-wave waveguide (SWG) whose impedance elements are rectangular patches with electrically tunable capacitors between them...
A sparse trifilar antenna can support two independent beams while, to reduce the interference between the beams, each array element supports only one beam. To minimize the grating lobe effects each beam is formed by three spiral arms resulting in a sparse random array arrangement. In this paper we investigate the impedance and radiation characteristics of such an array. We have shown that the active...
A novel low-cost 4-element planar array antenna directly fed by a coaxial cable for Ultrawideband (UWB) application is presented. The proposed antenna consists of 2*2 bowtie elements and a simple 1∶4 power divider feeding network. Comparing with the basic bowtie element, the impedance bandwidth of the array antenna has a significant improvement that the low cut-off frequency is extended from 6GHz...
This paper presents the design of an X-band 8×8 digital array radar antenna with aperture-coupled stacked patch antenna elements. The use of a resonant aperture and stacked patches resulted in a −10 dB reflection coefficient bandwidth of 7.6–12.8 GHz (51%). Scan angles up to ±80˚ have been achieved for certain frequencies and ±55˚ for a frequency band of 8–8.50 GHz. The array has been built using...
In this paper, a double dielectric superstrate layer DSL above a microstrip patch antenna in 60 GHz; based on the recent developed standards requirements; is studied and designed. The effects of microstrip antenna with a double superstrate layer on its gain, directivity and resonant characteristics is presented. We simulated the gain of antennas within and without a double superstrate layer. The maximum...
This paper discusses the use of slotted waveguide as antenna in wireless application. They are well suited to be integrated into the structure of the buildings. Radiation pattern is easily controlled by the geometry of the slots.
This paper compares a 4-by-4 dipole staggered pattern charge collector (SPCC) rectenna array to a 16 dipole rectenna array arranged in a four series-four parallel configuration. While each of these energy harvesting circuits has an identical footprint, the SPCC has a DC power pattern which simultaneously provides high gain and wide beamwidth. This profile provides RF energy harvesting sensors with...
Using parasitic elements in different configurations, many parameters of an antenna can be modified. Most of these approaches were found to alter the fundamental characteristics such as input impedance, gain, polarization and radiation pattern of an antenna. Array antennas with high gain comprise of complex feed distribution which is a major hurdle design at higher microwave frequencies. Using parasitic...
This paper presents a Ka-band variable gain amplifier (VGA) fabricated in a standard 0.18-μm CMOS process using the proposed cascade amplifier method to achieve both low phase variation and good output matching capacity in a variable gain mode. The proposed VGA achieves 14.2 dB gain control range with a phase variation of 8.9°. The input and output reflection coefficients versus the gain control bias...
In this work a high gain 16 element planar array operating in X-band was designed and optimized. The feeding network of the array was designed using suspended substrate striplines in order to reduce the feeding network losses as much as possible and by doing so to achieve a high radiation efficiency.
The work deals with numerical modeling results of two wire antennas that have quasi-isotropic radiation patterns in one of the main planes. First antenna is a modified Franklin antenna, which provides wider frequency bandwidth according to feed matching criteria. This antenna have isotropic radiation pattern in H-plane. It is series-fed antenna array. Second antenna is a modification of loop antennas...
This paper presents a new design of the Yagi antenna with a super-directivity of 8.9dBi. The Yagi antenna has two folded elements; one is a fed element and the other is a parasitic element. Except the high directivity, this antenna also shows quite good input impedance and return loss performance at the working frequency of 300MHz. The 10dB fractional bandwidth is only about 1.3%, which restricts...
A compact, printable, parasitic array antenna operating at dual resonances is investigated. The antenna is composed of a driver and two directors. All elements are printed with copper strips on both sides of a substrate (Rogers Duroid 5880). Two directors with different lengths are twisted to generate dual resonances. In both generated bands, high gain (> 8.0 dBi) and good front-to-back ratios...
A 60-GHz vector sum phase shifter with single-ended-to-differential function for phased array receiver using 90-nm LP CMOS technology is presented. This phase shifter incorporates a four-way quadrature power divider as a vector generator with two variable gain amplifiers and a vector modulator to achieve full-360° phase synthesizing. For 4-bit operation (22.5° phase resolution) from 57–64 GHz, this...
A dB-linear programmable gain amplifier (PGA)utilizing weighted input transistors, is implemented in a 0.18 μm CMOS process. The weighed input transistor units with constant current-density enable insensitive gain-steps while maintaining the load impedance condition. The gain range can cover from -18 dB to +30 dB in 6 dB steps, and the gain error is less than 1 dB. The 3 dB bandwidth (BW) is 60 MHz...
A methodology is presented to analyze interlaced and overlapped (interleaved) subarrays. The analysis is based on eigen vector excitation coupled with Floquet modal expansion of the subarray fields. Numerical results of interlaced and overlapped subarrays using probe-fed patch elements are presented. It is found that interlaced subarrays have superior performances over overlapped and conventional...
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.