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A planer antenna is developed for metallic framed tablet computer for various applications. The open slot dual antenna system for the 2G/ 3G/ LTE/ WWAN/ WiMAX bands is presented. The proposed antenna system can fit inside the tablet in such a manner that the display screen is above this antenna and the metallic frame of the tablet computer is below this antenna as a ground plane. The antenna composed...
As fast development in communication field, sub-6 GHz spectrum band becomes ultra crowd. Even though Carrier Aggregation (CA) and higher order modulation used, available spectrum is still the bottleneck of communication speed and network latency. Nowadays, more and more companies and institutes are paying more attention to over 6GHz communication system research. Recently released news indicate frequency...
In this paper, a kind of Ka-band Planar broadband slot-coupled antenna is introduced. In order to broaden the bandwidth, use E-shaped patch on the basis of the copper axial feed antenna. These two parallel slots is equivalent to two LC resonant circuits which has coupling effects. Meanwhile, slot on the ground. Through the simulation, the center frequency of the antenna is 29 GHZ and its relative...
This paper presents planar modified circular slot antenna with asymmetric Y-shaped feeding technique. The CPW asymmetric Y-shaped feeding structure is electromagnetically coupled to the modified circular shaped radiating patch. The proposed antenna is made circularly polarized by innovative Y-shaped asymmetric arm feeding structure. The antenna covers the impedance bandwidth of 2.04GHz–4.38GHz with...
A substrate integrated waveguide (SIW) end-fire antenna is proposed and analyzed for achieving wideband dual circularly polarized radiation performance. Wave-polarization is realized through constructing a two-layer SIW polarizer. The sloping slot etched on the common broad wall of the stacked SIWs could gradually induce a horizontally polarized electric field with a certain phase shift. Furthermore,...
A novel single-layer reflectarray element for broadband use is proposed. Ansoft HFSS is used to analyze the reflection phase for the element. By varying the element size, a slow slope of the reflection phase curve with the phase range over 600° is achieved. A center-fed 121-element reflectarray antenna is designed using the proposed elements and a linearly polarized pyramidal horn antenna is used...
A new design of artificial magnetic conductor (AMC) is recommended in order to improve the performance of a millimeter-wave (mmW) linear parallel feed network patch array antenna. An AMC is used as parasitic patches that are placed in two conditions at a frequency of 70 GHz. The first condition is the parasitic AMC patches are that placed closely to the antenna feed line and the second condition is...
In this paper, a capacitive-fed resonator is designed and investigated to excite the small bent planar monopole antenna. The proposed principle of bandwidth enhancement is verified by a 2.4 GHz antenna design. The enhanced bandwidth of the small antenna is 200 MHz, within a size of 18.6×24 mm2 (about 0.15λ×0.19λ).
In this paper, a simple wideband electromagnetic bandgap (EBG) resonator antenna (ERA) with an all-dielectric superstructure is presented to operate at 60 GHz. The antenna superstructure consists of two circular dielectric slabs with different relative permittivity values. A waveguide-fed slot antenna is used to excite the antenna's cavity and is placed about half a wavelength from the superstructure...
Nowadays, the band resources are increasingly scarce, showing a tendency toward situation, terahertz band gradually attracts people's discussion. However, it work in the high frequency, relatively wavelength is small and electromagnetic wave loss is very large, design and performance of the antenna structure must has some special requirements. In this article, we propose an antenna working in the...
According to the requirements for the antenna in the portable stroke imaging detection system, a miniaturized ultra-wideband antenna unit is presented in this paper. The size of antenna is 40 × 40 × 0.6 mm3 and measured working frequency (S11 < −10 dB) is 1 GHz to 4 GHz. The fabricated antenna is applied into the brain stroke detection experiment using simplified brain model. The results show the...
In this paper, a small top plate is found useful to improve the impedance bandwidth of an ultra-wideband dipole antenna horizontally above a ground plane. A linearly-polarized prototype based on this new and simple design methodology can operate over nearly 3.5∶1 bandwidth with return losses better than 10 dB, and with nearly stable radiation patterns, high BOR1 efficiency and aperture efficiency...
An improved series-fed dual-polarized antenna lattice in which the operational bandwidth has been significantly broadened has been proposed. The bandwidth of the presented antenna lattice has been significantly enhanced in comparison to the previously shown designs due to the change of the utilized dielectric structure and the use of stacked radiating elements. The novel concept of the modified dual-polarized...
Single layer single feed antenna with circularly polarized (CP) endfire radiation is proposed with superposition of two complementary dipoles. The half mode substrate integrated waveguide (HMSIW) serves as equivalent magnetic dipole, while the double side printed conductor arms act as electric dipole. To satisfy the required magnitude/phase relations between two dipoles for achieving CP characteristic,...
We present a substrate integrated waveguide (SIW) cavity-backed slot antenna with 34% bandwidth at X-band. Dual differential feeding with a phase offset of 90° is employed to achieve circular polarization, resulting in an excellent isolation. The antenna achieves wide-band circularly polarized radiation with symmetric patterns in both principal planes, with average gain of 5.7 dB and simulated radiation...
The offset fed planar inverted L antenna is proposed and numerically analyzed. The antenna characteristics of proposed antenna are compared with those of the planer dipole antenna. When the antenna size is 580 mm by 100 mm by 80 mm, the S11 less than −10 dB is satisfied at the frequency from 164 MHz to 293 MHz. At this frequency band, the directivity becomes 2.26 dBi to 3.84 dBi.
The world's largest single-reflector radio telescope is located in Arecibo. Its Gregorian dual-reflector feed was inaugurated in 1997, representing an enormous improvement in terms of bandwidth (limited by that of a wide-angle corrugated horn) and aperture efficiency compared to using the previous line feeds of about 1% bandwidth. The inauguration was preceded by an upgrading project of more than...
Microfluidic focal plane arrays (MFPAs) can provide beam-scanning capability without active RF devices. However, recent work showed that passive resonant feed networks of these MFPAs limit the performance in terms of bandwidth and loss as the FPA size gets larger for high gain applications (e.g. <3% bandwidth for >8 elements). This paper alleviates this issue by introducing a novel microfluidically...
An aperture coupled circular patch antenna is presented for dual circular polarization at Ka-band. Two microstrip lines are used to excite a circular patch through two slots to generate a broadband RHCP and LHCP radiation with high isolation between them. An aperture coupling is employed to provide a wide beamwidth axial ratio. The proposed antenna is a good element candidate to be considered for...
Some millimeter wavebands, such as 60 GHz, would probably be selected as the main operating frequencies of the next 5th generation wireless/mobile communication systems, for their obvious advantages of wider available transmission bandwidth and higher achievable transmission rate. In this paper, a novel structural design of microstrip antenna array working at the 60 GHz frequency band has been proposed...
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