In this paper, a novel CPW-fed antenna is presented for UWB applications. The antenna mainly comprises of a simple circular patch and a modified ground plane. The inclusion of two novel symmetrical rectangular slots with inner area of 3×2.8 mm2 to the top corners of the antenna creates a new path for the current and consequently leads to the bandwidth enhancement. A rectangular stub is also adopted to further broaden the antenna impedance bandwidth. The proposed antenna has a compact size of 20×20×1.6 mm3 and covers the wide frequency band of 3-23.5 GHz (154%). Constant gain and suitable radiation patterns are observed for the presented antenna. Good agreement between the simulated and measured results clearly shows the validity of the proposed structure. The design steps and bandwidth enhancement process are discussed in detail.

This paper presents a new approach for the design of a multiband uniplanar CPW-fed monopole antenna. The antenna consists of a fork like monopole strip to which is added an inverted U-shaped strip. The three branch fork like strip can create three resonant bands within the WLAN range while the placement of the inverted U-shaped strip provides a better impedance matching for the lowest resonant frequency band. Loading slot on the top of the U-shaped strip with asymmetric arms can add two further resonant frequency bands. This antenna can cover the frequencies of PCS, WiMAX and WLAN applications along with the major part of the C band. A prototype of the antenna is fabricated and tested. A good agreement is found between simulated and measured results.

A newly designed printed slot antenna is presented that incorporates variable two band-notched functions for ultra-wideband (UWB) applications. The two band notches of this coplanar waveguide (CPW) fed antenna are achieved by an M-shaped slot (MSS) embedded in the radiating element and a C-shaped strip (CSS) close to ground plane, therefore two very narrow rejected properties in the wireless local area network (WLAN) band (5. 15-5. 825 GHz) and worldwide interoperability for microwave access (WiMAX) operation in the (3. 3-3. 7GHz) are obtained. The rectangular aperture is etched in the square ground plane. It has a determinative role in antenna’ s impedance bandwidth (IBW) enhancement; moreover, by adjusting carefully it leads to wide IBW. Based on simulated results it covers the frequency range 2. 4– 12. 9 GHz with VSWR ≤ 2, which corresponds to a fractional bandwidth of 137% excluding the rejected bands. Numerical and measured results are presented to understand its behavior. The volume of the proposed antenna is 25 × 25 × 0. 8 mm3.

CPW structure is became common structure for UWB and multi band antenna design and SRR structure is well-known kind of metamaterial that has been used in antenna and filter design for multi band application. In this paper, a SRR dual band monopole antenna with CPW-fed for WLAN and WiMAX is presented. The prototype antenna is designed for wireless communication such as WLAN and WIMAX respectively at 2.4 GHz and 5 GHz. The HFSS and CST microwave studio are used to simulate the prototype antenna for two different FEM and time domain method and they have also been compared with the experimental results. The total size of the antenna is 60mm×55mm×1.6mm and it is fabricated on FR-4 low cost substrate. The antenna is connected to a 50 W CPW feed line. Its bandwidth is around 3% for 2.45 GHz (2.4-2.5 GHz) and 33% for 5.15GHz (4.3-6 GHz).Its limited bandwidth in 2.4 GHz frequency is benefit for power saving at indoor application. The antenna has 2-7 dBi gain in the mentioned bands with an Omni-directional pattern. The antenna experimental result shows good similarity to simulation kind for return loss and pattern. Here, the effect of parasitic SRR on current distribution has been studied in presence and absence of parasitic element. The simulation of polarization is confirmed that the antenna has linear polarization. Here comparison between antenna return losses in absence of each parasitic element is presented.

A new design of coplanar waveguide (CPW)-fed antenna with circular polarization (CP) and excellent impedance matching is presented. In this design a pair of circular-shaped slits is applied to opposite corners of the slot for enhancing the impedance matching and realizing bandwidth of 134. 43 % across 2. 98-15. 20 GHz for VSWR ≤ 2. Furthermore, this structure exhibits axial ration bandwidth (ARBW) of 36. 22 % across 4. 43-6. 39 GHz by embedding two inverted L-shaped ground arms in the slot. The total dimension of the proposed antenna is 25 × 25 × 0. 8 mm3. This new design has advantages of, supporting the ultra-wideband (UWB) systems and covering the WLAN spectrums with 3 dB CP radiation and VSWR ≤ 2 simultaneously. The numerical and experimental results of the antenna explain the superiority of the proposed antenna performance in comparison with recent similar works.

In this paper, a miniaturized coplanar waveguide fed (CPW-fed) tapered slot antenna (TSA) is introduced for breast cancer detection. Here, a modified CPW to slot-line transition structure with an air-bridge is employed to broaden the transition bandwidth and increase the radiation efficiency. Through these applied modifications, negative features of the original TSA (limitation of transition) and antipodal Vivaldi antenna (bad cross-polarization) are both removed, while all the positive features remained. We have developed a FDTD-UPML method in lossy environment by using Debye model. To validate the results, a prototype of the proposed antenna is fabricated and tested. By immersing the antenna in alcohol ethanol as a lossy coupling medium and inserting it close to a two-layer breast phantom, near-field parameters are calculated in different probe locations. Results show that the proposed structure offers a broad bandwidth of 0.5–19 GHz and also exhibits an appropriate current distribution with high radiation efficiency. Images of energy flux density (EFD) and fidelity factor (FF) confirm the good performance of the antenna in near-field region.

This paper presents a new design of a Coplanar Waveguide (CPW)-fed multi-bands planar antenna. This antenna can be integrated easily with passive and active elements. The proposed antenna is suitable to operate for GPS, PCS and WiMAX bands. Its entire area is 52. 3x52. 6 mm2 and is employed on an FR-4 epoxy substrate and fed by a 50 Ohm coplanar line. The antenna parameters have been analyzed and optimized using Advanced Design System (ADS). Before passing to the fabrication of this antenna structure, we conducted a study into simulation using CST microwave studio and Ansoft’ s HFSS solvers in order to verify the ADS results. The fabrication and test of the final circuit permits to have a good agreement between simulation and measurement results.

The hexagonal shaped slotted Wine glass shaped Co Planar Waveguide (CPW) fed antenna for wireless applications is proposed in this paper. The Woodpile based Electronic Bandgap (EBG) structure is used as linked ground surface for bandwidth and gain enhancement. The performance characteristics of different sized strip widths of woodpile structures with wine glass shaped antenna have carried out; the antenna resonates in the band of 2GHz, 5 GHz, and 7 GHz. The band width enhancement of 43 % and gain of 9 dB at 1. 9910 GHz for 1mm strip width of woodpile has observed. In addition, the group delay variation and E – plane co and cross polarization radiation patterns for various strip widths of woodpile structure have obtained. The group delay is maintained less than 5 nanosecond and there is a significant difference between co and cross polarization for E-plane radiation patterns for 1mm strip width of woodpile structure. The antenna is fabricated with hexagonal slot and 1mm strip width woodpile structure and tested for return loss and radiation pattern.