Compact band-notched ultra-wideband antenna

A novel band-notched ultra-wideband antenna having small dimensions (12.7 times 22 times 1.6 mm) is proposed. With the use of a modified ground plane, a microstrip feed with bevel, and parallel dual patches, the proposed antenna has very wide impedance bandwidth measured at 8.18 GHz (2.97 to 11.15 GHz, defined by 2:1 VSWR). By inserting slits in the ground plane, a band-notched frequency of 5.12 to 5.88 GHz is achieved. The transmission loss and group delay are measured and discussed.     

Compact coplanar waveguide fed ultra wideband antenna with a notch band characteristic

A coplanar waveguide (CPW) fed ultra-wideband (UWB) antenna with a notch band characteristic is presented for 2.4 GHz and UWB applications. The bandwidth is broadened by embedding two inverted L-shaped slots in the CPW ground and the notch band is achieved by etching a rectangle slot in the CPW ground. The notched band can be controlled by adjusting the length of the rectangle slot and the two inverted L-shaped slots. Experimental and numerical results show that the proposed antenna with compact size of 28 × 21 mm², has an impedance bandwidth range from 2.38 GHz to 12.0 GHz for voltage standing-wave ratio (VSWR) less than 2, expect the notch band frequency 5.0–6.0 GHz for HIPERLAN/2, IEEE 802.11a (5.1–5.9 GHz) and C-band (4.4–5 GHz) for satellite and military applications.     

Compact coplanar waveguide-fed ultra-wideband antenna

A novel coplanar waveguide fed planar antenna with an extremely broad bandwidth in excess of 128% is presented. This comfortably covers the required bandwidth for ultra-wideband communication applications, and exhibits the required omnidirectional pattern characteristics. The antenna is also very small in size, only 0.3 lambda square at 3 GHz     

Compact omnidirectional band-notch ultra-wideband antenna

A novel ultra-wideband printed monopole antenna with a band-notch characteristic and stable omnidirectional radiation is presented. The antenna design adopts a bevelled square patch as a monopole, a double-feed technique and a microstrip feeder embedded with an inverted U-shaped slot. Good agreement between simulation and experiment shows that the proposed antenna achieves an impedance bandwidth of 3.05-5.15 and 6.02-10.84 GHz for VSWRles2, a stable omnidirectional radiation and a low cross-polarisation level.     

Compact band-notched ultra-wideband antenna with parasitic elements

A compact band-notched ultra-wideband antenna with parasitic elements having small dimensions (12.7 x 21.6 x 1.6 mm) is proposed. With the use of a modified half-circular patch and half-wavelength parasitic lines, the proposed antenna has very wide impedance bandwidth measured at 8.6 GHz. By placing a parasitic loop, a band-notched frequency of 5.16 to 5.98 GHz is achieved. The group delay and transmission loss are measured and discussed.     

Compact ultra-wideband antenna with dual bandstop characteristic

A simple and compact ultra-wideband microstrip-fed planar antenna with dual bandstop characteristic is presented. By using a U-slot defected ground structure (DGS) in the feedline, a stopband of 600 MHz (from 5.45 to 6.05 GHz) for band rejection of WLAN is achieved. To obtain another stopband, an arched slot is etched on the radiating patch. Experimental results show that the designed antenna, with a compact size of 30 times 24.5 mm, has an impedance bandwidth of 2.8-11 GHz for voltage standing wave ratio (VSWR) less than 2, except two frequency stop-bands of 3.5-4.25 GHz and 5.45- 6.05 GHz. Moreover, the antenna has good omnidirectional radiation patterns in the H-plane.     

Compact ultra-wideband antenna with tri-band notched characteristic

A compact ultra-wideband printed planar antenna with tri-band notched characteristic is presented. Two different types of slots are used to obtain tri-band notched characteristic. By using a U-slot defected ground structure, a notched band, 5?6 GHz for WLAN, is achieved. An H-shaped slot is etched on the radiating patch to obtain another two notched bands at 3.3?3.7 GHz for WiMAX and 7.2 GHz for some C-band satellite communication systems. The proposed antenna yields an impedance bandwidth of 3.1?10.6 GHz with VSWR , 2, except the notched bands. The antenna is successfully simulated and measured, showing tri-band notched characteristic can be obtained by using two different slots.     

Compact ultra-wideband printed antenna with band-rejection characteristic

A novel and compact ultra-wideband printed antenna with band-rejection characteristic is proposed. By cutting an L-shaped notch on the radiating patch, the impedance bandwidth of the proposed antenna can be enhanced. In addition, a C-shaped slot is introduced to obtain the band-rejection operation of the antenna. The antenna, with compact size of 15.5/spl times/21 mm including the ground plane, operates over 3.08-10.97 GHz and has the rejected band from 5.03 to 5.91 GHz.     

CPW-fed planar ultra wideband antenna having a frequency band notch function

A CPW-fed planar ultra-wideband antenna with hexagonal radiating elements is presented. The antenna also has a frequency band notch characteristic. By inserting a V-shaped thin slot on the hexagonal radiating element, the narrow frequency band notch has been created very close to the desired frequency.     

Compact wide-slot antenna for ultra-wideband communications

A novel microstrip-line-fed wide-slot antenna is proposed. Investigations on the prototype of the bevelling square slot design with a small tail slot were employed to increase the wide impedance bandwidth range. The proposed antenna has a simple, symmetric structure and compact size. The matching impedance below 2:1 VSWR is applicable to ultra-wideband communications (3.1-10.6-GHz) with proper choices of bevel of the slot and the size of the tail slot cut in the ground plane.     

Compact printed ultra-wideband monopole antenna with dual band-notched characteristics

A compact printed ultra-wideband (UWB) monopole antenna with dual band-notched characteristics is presented. One complementary split-ring resonator (CSRR) is etched inside the patch of the monopole antenna to achieve dual notch frequency bands. A practical example for a UWB antenna (working from 2.90 to 12 GHz) is demonstrated, with one notch frequency band at 3.40-3.48 GHz and the other at 5.40-5.98 GHz. In addition, the effect of the dimensions of the CSRR on the dual notch frequency bands is also analysed.     

Compact printed ultra-wideband monopole antenna with dual band-notch characteristic

A compact ultra-wideband microstrip-fed planar antenna with dual band-notch characteristic is presented. Two notched frequency bands are achieved by embedding an E-slot in the radiation patch and a U-slot defected ground structure in the feeding line. Moreover, the two notched bands can be controlled by adjusting the length of the corresponding slot. Experimental results show that the proposed antenna, with compact size of 35 x 14 mm, has an impedance bandwidth of 2.87-10.91 GHz for a voltage standing-wave ratio less than 2, except two frequency notched bands of 3.49-4.12 and 5.66-6.43 GHz.     

一种采用组合陷波结构的新型超宽带平面天线

首先提出了一种小型平面超宽带天线的设计。天线采用FR4印刷电路板制作,由共面 的叉形辐射单元和多边形缝隙构成,整体尺寸为30 mm×28 mm×0.8 mm。采用 HFSS软件对天线进行了优化设计和参数分析。然后,通过在叉形辐射单元增加微带开路枝节 并且在地板开一对倒L形细裂缝的办法,设计了组合陷波结构的超宽带天线。实验表明：组 合陷波结构天线在51～5.9 GHz阻带内,回波损耗的最大值达-1.5 dB,与常规的 单陷波结构超宽带平面天线相比较,其回波损耗频率曲线更为陡峭,从而能更有效地提高 超宽带通信系统抑制无线局域网设备所带来干扰的能力。     

超宽带双极化平面交叉偶极子天线设计

设计了一种新型单层结构的超宽带双极化平面交叉偶极子天线。该天线采用2对方环偶极子正交排布实现双线极化,在方环偶极子内部加载枝节,外部加载寄生方环,引入新谐振点,大幅度扩展了天线带宽;天线结构紧凑,尺寸仅为0.25λL′0.25λL(λL为低频截止频率对应的空间自由波长)。设计和加工制作了一件工作于甚高频(VHF)频段的天线样品,测试结果表明,该天线能够在55~155 MHz实现电压驻波比(VSWR)<2.5,阻抗带宽达到96%,同时天线在整个工作频带呈现良好的定向辐射特性,增益大于7 dB。     

CPW-fed right-angled dual tapered notch antenna for ultra-wideband communication

A CPW-fed right-angled dual tapered notch antenna for ultra-wideband (UWB) communication is presented. The antenna has two tapered notches, which are located at a right-angled corner. The measured gain pattern shows that two main beams are equally generated with approximately 7 dBi at 5 GHz. The performance of the antenna has been tested in a UWB communication experiment.     

Compact wideband planar monopole antenna

When a shorting pin is added to the planar monopole antenna, an additional mode is excited below the fundamental mode. By optimising the dimensions. A compact wideband antenna can be constructed. The size reduction achievable for this antenna is ~50% compared with an equivalent planar monopole without a shorting pin. Owing to its compact size and wideband performance, this antenna is suitable for use in existing and future mobile communication terminals     

一种紧凑型高隔离度的MIMO超宽带天线研究

提出一种紧凑型高隔离度多输入多输出超宽带天线,该天线由两个共面梯形辐射单元背靠背连接在一起构成,衬底材料的相对介电常数为4.4。在两个辐射单元之间放置高隔离金属条,确保天线具有高隔离度。该天线在整个超宽带频带上电压驻波比VSWR为2:1,隔离度高于20 d B,峰值增益为5.2 d Bi,峰值有效率为90%,且包络相关性系数ECC(Envelope Correlation Coefficient)≤0.164 1。     

多用途陷波小型超宽带天线

提出了一种具有陷波特性的多用途小型超宽带微带天线。该天线类似一般的宽缝隙微带天线,但在矩形调谐支节内嵌入T形支节获得了陷波特性。通过数值仿真和实验测量,对天线的阻抗特性、方向图和增益进行了研究。结果显示该天线在2.39～12GHz的频段内驻波比小于2,其中的5.15～5.95GHz的范围内具有陷波特性。同时该天线还可覆盖2.4GHz无线局域网(WLAN)频段,在整个工作频段内有良好的辐射方向特性。     

Broadband dual-frequency CPW-fed planar monopole antenna with rectangular notch

A rectangular notch is introduced to obtain a broadband dual-frequency operation of a planar monopole antenna fed by a coplanar waveguide (CPW). The antenna is printed on a single metal layer and therefore is easily constructed. Prototypes of the proposed antenna designed for WLAN operations in the 2.4 and 5.2 GHz bands have been constructed and tested. Both theoretical and experimental results for bandwidths and radiation characteristics are presented and discussed.