Multiband Printed Loop Antenna for UWB Applications

In this paper requirements for the Ultra-wideband antenna and differences between narrow-band and ultrawideband antennas for wireless system are discussed. Also a novel printed loop antenna with introducing an L shape portion to its arm is presented. The antenna offers excellent performance for lower-band frequency of UWB system, ranging from 3.1 GHz to 5.1 GHz. The antenna exhibits a 10 dB return loss bandwidth over the entire frequency band. The antenna is designed on FR4 substrate and fed with 50 ohms coupled tapered transmission line. It is found that the lower frequency band depends on the L portion of the loop antenna; however the upper frequency limit was decided by the taper transmission line. Though with very simple geometry, the results are satisfactory.

In this paper, we propose Ultra Wide Band planar monopole antenna for wireless communication. It consist of a rectangular patch with a simple meander line slot is inserted into the radiating patch, and a partial ground plane operate for the frequency 6 GHz to 13GHz. As well as the conception of this one to ensure the antenna diversity operate for the frequency 2 GHz to 6GHz. The antennas are printed on FR4 substrate with dielectric constant of 4.4 and substrate thickness of 1.578 mm.

In this paper we proposed A Tri shaped printed patch antenna for UWB applications. This antenna consists of a rectangular patch with circle and triangle slots on the top face and a partial ground at the rear end. The antenna is fabricated with substrate FR-4 epoxy dielectric with relative permittivity of 4.3. Investigations based on simulations and experiments are conducted. The simulation is performed using CST Microwave studio. The proposed antenna is successfully implemented and the simulated results show reasonable agreement with the measured results. In this design, a 4.94GHz to 10.4 GHz frequency range for S 11 ≤-10 dB is obtained, VSWR ≤ 2. This paper presents return loss, E-field distribution, H-field distribution, radiation pattern, input impedance and VSWR.

Advancement in Microstrip Antennas with Recent Applications, 2013

Loop antennas of circumference greater than a wavelength are generally known to have a good directive radiation pattern. However, for use in UWB applications, the variation of the radiation pattern with frequency must also be taken into account. Besides a good wideband radiation pattern, the impedance bandwidth of the antenna is also very important. The quality of a transmitted and received UWB pulse from the antenna will be a combination of both these factors. In this paper, we first investigate the characteristics of loop antennas with respect to both these factors. Next, we propose a new loop antenna configuration to overcome the limitations of the standard loop antenna for UWB applications. The new antenna consists of two concentric half-loops directly coupled to each other. The proposed antenna is analyzed using the Method-of-Moments (MoM). The theoretical and measured results agree with each other closely and attest to the fact that the new antenna has a far superior impedance bandwidth when compared with conventional loop antennas. Further, it is shown that the new antenna has a good gain and a useful radiation pattern for directional wireless links. The advantages of the antenna are conclusively demonstrated by successfully deploying it in a very high speed (500 Mbps) point-to-point UWB link.

IOP Conference Series: Materials Science and Engineering

This manuscript develops the design of rectangular patch antenna with loaded on defected ground structure (DGS), which covers the entire range of ultra-wideband (UWB). The area of proposed antenna 33×35 mm 2 and is printed on FR-4 plane substrate, its permittivity (ℇr) 4.2 and loss tangent (tanδ) is 0.02 at entire frequency range. Proposed structure renders wider impedance bandwidth extended from 2 GHz to 10.7 GHz at < -10 dB return loss (VSWR< 2) with multi-bands. The UWB antenna suitable for UMTS 2.1 GHz, WLAN 3.5 GHz, WiMAX 5.8 GHz, and X-band 7.5 GHz applications. The parameters of antenna such as loss of return are reduced, and width of band, as well as gain in VSWR, is improved to an acceptable limit with reasonable radiation pattern by means of CST V.17 EM simulator. The results from simulation and experiment results are almost similar to acceptable limit.

International Journal of Antennas and Propagation, 2017

A comprehensive review concerning the geometry, the manufacturing technologies, the materials, and the numerical techniques, adopted for the analysis and design of wideband and ultrawideband (UWB) antennas for wireless applications, is presented. Planar, printed, dielectric, and wearable antennas, achievable on laminate (rigid and flexible), and textile dielectric substrates are taken into account. The performances of small, low-profile, and dielectric resonator antennas are illustrated paying particular attention to the application areas concerning portable devices (mobile phones, tablets, glasses, laptops, wearable computers, etc.) and radio base stations. This information provides a guidance to the selection of the different antenna geometries in terms of bandwidth, gain, field polarization, time-domain response, dimensions, and materials useful for their realization and integration in modern communication systems.

Ultra wideband (UWB) is a technology that has led to many important advances in wireless communication today and for this reason, comprehensive research has been conducted to improve the performance of conventional narrowband microstrip antennas in terms of bandwidth, gain and radiation pattern. An ultra wideband bowtie antenna 2 x 2 array is designed and simulated in this project. It consists of 2 equilateral triangular elements with slots and an impartial ground plane operating in an approximate frequency range between 4GHz and 8GHz. VSWR < 2 lies within range of 4.99GHz to 6.99GHz. Frequency selectivity has been implemented by employing a 4-to-1 Wilkinson Power Divider and 2 narrowband bandpass filters with resonant frequencies of 4.5GHz and 6GHz.

2010 International Conference on Microwave and Millimeter Wave Technology, 2010

In this paper, a planar antenna for UWB applications has been proposed. The antenna consists of a square patch, a partial ground plane and a slot on the ground plane. The proposed antenna is easy to be integrated with microwave circuitry for low manufacturing cost. The flat type antenna has a compact structure and the total size is 14.5×14.5mm 2 . The result shows that the impedance bandwidth (VSWR≤ 2) of the proposed antenna is 12.49 GHz (2.95 to 15.44 GHz), which is equivalent to 135.8%. Details of the proposed compact planar UWB antenna design is presented and discussed.

A Ultra Wide Band Antenna (UWB) with notched band is proposed and to be analyzed. It consists of square radiating Patch and the grounded plane. The Notched band characteristics are analyzed using T-shaped stubs embedded in the square slot of the radiation patch and a pair of U-shaped parasitic strips beside the feed line. The results that are to be measure using the proposed notched-band planar antenna is the rejection of the bands,3.3-4.0 GHz (WiMAX),5.05-5.90 GHz (WLAN),5.5 GHz (DSRC) and 6.2-9.5 GHz (FIXED WIRELESS AND RADIO LOCATION) respectively. And to offer dedicated service in three bands. Both experimental and simulated results of the proposed antenna are to be analyzed indicating that the antenna is attracted for various UWB Applications.