一种CPW馈电圆形缝隙宽带圆极化天线

设计了一种共面波导(CPW)单端口馈电的圆形缝隙宽带圆极化(CP)印刷天线。该天线通过在圆形缝隙侧面附加圆形枝节,结合CPW端口伸出的激励带条,激励出一对相位差90°的差分正交简并模,从而辐射圆极化波。对天线模型进行了优化设计和实物加工,测试结果表明,该天线的轴比带宽(AR<3dB)达到12.5%;最大增益为3.8dB,在轴比带宽内增益的变化幅度小于1dB。     

A Compact CPW-Fed Planar Stacked Circle Patch Antenna for Wideband Applications

The article investigates the performance of planar and compact CPW-fed microstrip patch antenna that offers 10 dB impedance bandwidth over the wide frequency range between 2.59 and 7.61 GHz. The parametric analysis of various design variables is included to acquire the final design of proposed antenna. The prototype exemplary of designed antenna is experimentally tested to obtain the return loss, VSWR, radiation response and gain characteristics. The close agreement is acquired between simulated and experimental results.The projected antenna has compact size of 0.61λ₀ × 0.44λ₀ × 0.027λ₀ mm³ and offers a 10 dB wide impedance bandwidth of 5.02 GHz. Thus, it may be considered suitable for variety of wireless applications including WLAN, Wi-MAX, fixed satellite services, wireless point-to-point applications etc.

     

CPW-Fed Quasi-Magnetic Printed Antenna for Ultra-Wideband Applications

An optimized coplanar waveguide fed quasimagnetic printed antenna for ultra wideband applications is described. A parameter study, motivated by a design procedure, allowed a substantial increase in the return-loss operational bandwidth. The numerically predicted performance was validated by means of physical measurements of fabricated samples. The measured radiation patterns of the antenna demonstrated its adequate radiation characteristics. The feed radiation was also investigated by means of physical measurements.     

Ultra Wideband Co-planer Microstrip Patch Antenna for Wireless Applications

In this paper, a comparative study of co-planar gap coupled rectangular and elliptical microstrip patch antenna is presented. It is analyzed by using circuit theory concept. The proposed antennas show ultra wideband operations which depend on dimensions of the patches, gap between them as well as air gap thickness. It is observed that the performance of gap coupled elliptical patch antenna is better than that of rectangular patch antenna while the area of rectangular and elliptical patches is same. The bandwidth of proposed rectangular patch antenna is found to be 50.7 % with average gain of 6.5 dBi while for elliptical patch antenna the bandwidth and gain further improves up to 57.6 % and 9.5 dBi respectively. The theoretical results are in good agreement with the simulated results obtained from IE3D simulation software.     

Patch Loaded Slot Antenna for Super Wideband Applications with Dual-Band Notch Characteristic

Wireless Personal Communications - This paper presents a patch loaded slot antenna for super wideband (SWB) application. To obtain SWB characteristic, the proposed antenna geometry combined a...     

一种面向无线通信应用的宽频带圆极化天线阵

提出了一种新型宽频带2×2方形缝隙槽圆极化天线阵.天线阵包含一个连续旋转馈电结构、4个非对称U型馈电枝节和一个方形槽接地板.与传统圆极化天线阵所采用的L型馈电枝节不同,首次提出了一种新型非对称U形馈电枝节来改善天线的圆极化性能.利用这些枝节和缝隙槽作为微扰元素,缝隙槽天线阵可以激发多重圆极化谐振模式,进而产生宽频带的圆...     

A Cat-Shaped Patch Antenna for Future Super Wideband Wireless Microwave Applications

Wireless Personal Communications - Compact super wideband (SWB) monopole antenna with a novel Cat-shaped patch is proposed and investigated for wireless applications in this article. The...     

Printed Wide-Slot Antenna for Wideband Applications

The design and analysis of a novel printed wide-slot antenna, fed by a microstrip line, for wideband communication systems is presented. Detailed simulation and experimental investigations are conducted to understand its behavior and optimize for broadband operation. The designed antenna has a wide operating bandwidth of over 120% (2.8-11.4 GHz) for S11 <-10 dB. In addition to being small in size, the antenna exhibits stable far-field radiation characteristics in the entire operating bandwidth, relatively high gain, and low cross polarization. By properly choosing the suitable slot shape, selecting similar feed shape and tuning their dimensions, the design with very wide operating bandwidth, relatively small size and improved radiation pattern is obtained. A comprehensive parametric study has been carried out to understand the effects of various dimensional parameters and to optimize the performance of the designed antenna. Results show that the impedance matching of this kind of antenna is greatly affected by the feed-slot combination and feed gap width, with the slot shape being a main contributor of the radiation characteristics. The simulated and measured Results for return loss, far-field E and H-plane radiation patterns, and gain of designed antenna are presented and discussed.     

Wideband Frequency-Reconfigurable Antenna for Airborne Applications

Wireless Personal Communications - One of the important objectives of underwater acoustic sensor network is to extend the lifespan of a network which depends on the topology control mechanisms....     

Printed Planar Antenna for Wideband Applications

A compact planar antenna operating at a frequency range of 3–16 GHz is presented for wideband applications. The antenna is composed of a square patch fed by a microstrip line and a partial ground plane with a rectangular slot. The proposed antenna is very easy to be integrated with microwave circuitry for low manufacturing cost. The flat antenna has a compact structure and the total size is 29 mm × 22 mm. The result shows that the measured impedance bandwidth (VSWR≤ 2) of the proposed antenna is 3.2–15.44 GHz, with a notch from 4.7 to 5.8 GHz. The effects of the structure parameters on impedance bandwidth are also investigated. Details of the proposed compact planar antenna design are presented and discussed.     

Ultra Wide Band CPW-Fed Circularly Polarized Microstrip Antenna for Wearable Applications

Wireless Personal Communications - Internet of Things (IoT) is increasingly deployed in different domains and environments including smart homes, smart cities, healthcare, industry 4.0, and smart...     

一种紧凑型MIMO超宽带缝隙天线设计

设计了一种紧凑型的MIMO超宽带缝隙天线。该天线不采用任何解耦结构可以获得较高的隔离度。通过应用位置不对称的天线单元和缝隙天线来实现,这种结构可以减小天线的尺寸,设计的超宽带天线尺寸为15mm×20mm。测量结果表明,超宽带天线在3.1~12.0GHz内保持良好的全向辐射特性和稳定的增益,测量阻抗隔离比大于24dB。相关系数(ECC)和信道容量损失(CCL)都在可以接受的范围内。该天线可应用于超宽带通信系统中。     

Compact Switched-Beam Antenna Employing a Four-Element Slot Antenna Array for Digital Home Applications

In this paper a compact switched-beam antenna is proposed. The antenna is composed of a four-element antenna array based on L-shaped quarter-wavelength slot antenna elements. Such an antenna element is a planar structure and presents a directional radiation pattern in the azimuth plane. Its maximum radiation direction is toward near the direction of the open end of the slot. As a result, the open ends of the four slot antennas are arranged toward $0, pi/2, pi$, and $3pi/2$ , respectively. The statuses of these antennas are controlled by some diodes. Consequently, by carefully controlling the diodes, an antenna with several switchable patterns can be achieved. To prove the concept, a 2.4–2.5 GHz switched-beam antenna for WLAN applications is designed and implemented. Its size is 52 mm in square. The antenna possesses eight directional patterns and many nearly omnidirectional patterns in the azimuth plane. The experiment results fully demonstrate the performance of the proposed design. The envelope correlations and the characteristics of the designed antenna are also discussed. Due to the compact size and low manufacture cost, such a design can be a promising solution for digital home applications to overcome multipath problems and increase the transmission data rate.      

Investigations on Ultrawideband Pentagon Shape Microstrip Slot Antenna for Wireless Communications

An ultrawideband (UWB) pentagon shape planar microstrip slot antenna is presented that can find applications in wireless communications. Combination of the pentagon shape slot, feed line and pentagon stub are used to obtain 124% (2.65–11.30 GHz) impedance bandwidth which exceeds the UWB requirement of 110% (3.10–10.60 GHz). A ground plane of 50 mm $times$ 80 mm size is used which is similar to wireless cards for several portable wireless communication devices. The proposed antenna covers only the top 20 mm or 25% of the ground plane length, which leaves enough space for the RF circuitry. Three variations of the antenna design using the straight and rotated feed lines on two different substrates are considered. Effect of the conducting reflecting sheet on back of the antenna is investigated, which can provide directional radiation patterns but with reduced matching criteria. Finally, experimental verification of the fabricated antenna for its impedance bandwidth is carried out, which shows agreement with the simulated data.      

Design of Wideband Flower-Shaped Microstrip Patch Antenna for Portable Applications

Wireless Personal Communications - Energy consumption and the secure transmission are the increasing fields of research challenge in wireless sensor network (WSN) applications. Heterogeneous WSN is...     

Design of Stacked Rectangular Dielectric Resonator Antenna for Wideband Applications

Wireless Personal Communications - In this article, we present the study to improve the bandwidth of the dielectric resonator antenna (DRA) excited by aperture coupled feed by using a stacked DRA...     

Multiband Microstrip-Fed Right Angle Slot Antenna Design for Wireless Communication Systems

This paper presents a novel multiband microstrip-fed right angle slot antenna design technique for multiple independent frequency bands. The new technique uses various slot sizes at various appropriate positions. We first propose a tri-band slot antenna consisting of three right angle slots. Then, a quad-band slot antenna is developed with four right angle slots which achieves slant ±45° linear polarization, omnidirectional pattern coverage, good antenna gain, and acceptable impedance bandwidths over all the operating frequency range. Moreover, an open-circuited tuning stub is introduced to achieve good impedance matching. Both proposed antennas are designed on a ground plane of RT/duroid 5880 substrate with a thickness of 1.575 mm. The real measurable results show that the desired frequencies used in wireless communication systems, namely, WLAN and WiMax, are efficiently achieved.     

Low-Complexity Antenna Diversity Receivers for Mobile Wireless Applications

This paper describes low-complexity diversity receiver techniques suitable forhandsets and other wireless mobile applications. The techniques areillustrated using two branches of diversity feeding aparameter-combining RF circuit at the front-end, followed by asingle digital receiver chain. A baseband processing algorithm isused to adjust the front-end combining parameters, allowing the receiver toadaptively choose among three different diversity techniques. The method aspresented is primarily targeted for indoor environments where handset movementis slow and delay spread is small. We present algorithms for efficientco-phasing and equal-gain combining as well as a novel cochannelinterference-reduction algorithm. These are implemented in a system simulationat 900 MHz which conforms to the PACS standard. Link performance for selectiondiversity (SD), equal-gain combining (EGC), and interference-reductioncombining (IRC) is presented. The algorithm's performance is compared withoptimal combining parameters, and its performance as a function of Dopplerfrequency is enhanced. The results show that EGC and IRC yield asignal-to-noise improvement of 1 dB and a signal-to-interference improvementof 4 to 5.5 dB respectively, compared with SD. The receiver also lowers theirreducible word error rate due to multipath delay spread for Doppler shiftsof 6 Hz and below. Finally, algorithm behavior is characterized and discussed.     

A 60-GHz Wideband Slot Antenna Based on Substrate Integrated Waveguide Cavity

This paper proposes a new wideband W-band substrate integrated waveguide (SIW) cavity-backed slot (CBS) antenna. The SIW cavity suppresses the backward radiation and ensures this antenna have a very low profile (only about 4% of the operating wavelength). Several techniques, such as slot resonator with semicircular end, quarter-wavelength microstrip resonator, are introduced to improve impedance matching. The studied results demonstrate that this antenna has wide operating bandwidth in 54.3–67 GHz (about 20.9% of the fractional bandwidth), unidirectional radiation pattern and good linear polarization characteristic. These properties are very suitable for RF front-end system-on-package (SoP) design in millimeter wave wireless communication systems.