Return Loss Plot Research Articles

A modified sierpinski carpet antenna structure for multiband wireless applications

Multiband patch antenna has a very important part in the communication devices and systems. The benefits in designing and testing of Sierpinski carpet geometries for a low profile, cost effective multiband microstrip patch antenna for wireless standards is reviewed in this paper. The basic structure of the patch antenna is designed using the FR4 substrate with a thickness of 1.3 mm. The designed patch antenna structure is excited using the microstrip feed system. The Sierpinski carpet antenna structure is designed and simulated using High Frequency Structural Simulator (HFSS) software. The available Sierpinski carpet antenna structure in the literature is modified to make the preferred radiation patterns. The effects of the iterations of the modified Sierpinski carpet antenna structure over the generated return loss plots are discussed in this work. Based on the generated multiband behavior in the simulated results, the accomplishment of the designed antenna in the wireless domain was analyzed.

MULTIFREQUENCY STACKED PATCH ANTENNA ANALYSIS

In this paper, the theoretical and simulated results of a quad-band patch antenna without any air/foam gap between the dielectric layers are discussed. The design idea uses a skated dielectric layers to achieve a multi-frequency operation. The antenna under study includes four patches patterned on the top of layered dielectric substrates and is stacked vertically. Two pairs of spaced slits are embedded at the patch's radiation edges of the bottom and second patches to adjust the resonant frequencies. The resonant frequencies of the different patches are obtained at 4 GHz, 5 GHz, 6 GHz, and 7 GHz. According to the cavity theory and equivalent circuit approach, a theoretical model of the multilayer stacked patch antenna (MLSPA) is determined. Theoretical and simulated return loss plot is presented to validate the proposed design. The antenna parameters such as radiation pattern, gain, voltage standing wave ratio (VSWR), and beam-width are also discussed. Good impedance matching and radiation characteristics at the four operating bands make this antenna a good candidate for many applications. The antenna simulations are performed using a high frequency structure simulator (HFSS) 15.0 tool.

Dual Polarized Multiband Stub and Slot Loaded Semicircular Microstrip Antenna

A multiband configuration using semicircular patch fabricated on glass epoxy at height of 1.58mm was reported. The patch was loaded with a stub and a slot. Three bands were observed respectively at 3.5GHz with gain of 1.5dBi due to patch, 2.45 GHz with gain of 1.2dBi due to stub and 5.5GHz with gain of 1.8dBi due to slot. However detailed explanation of various resonant modes for getting multiband dual polarized response was not given in the reported work. In this paper a detailed analysis using resonance curve plots, return loss plot and vector surface current distributions explaining the multiband dual polarized response of reported work is presented. It is observed that length variations of stub and slot modify various modes of semicircular patch in such a way that results into multiband band dual polarized response. The dimension along with position of slot and stub with given feed location causes matching input impedances of TM10, TM31 and TM32 modes which results in multiband dual polarized response.

Review Paper on Different Dual Band Printed Slot Antenna for 5G Wireless Communication

<span>With advancement in communication technology over the past decade, there is an increasing demand for miniaturization, cost effective, multiband and wideband antennas. Dual band printed slot antenna designs can support in meeting these requirements. Various techniques, different shapes and geometries have been introduced for size reduction of dual band printed slot antennas. This paper is on various techniques for designing dual band printed slot antenna exhibits details of different geometries developed to get multiband behavior of printed slot antenna. In this paper geometry of the antenna and variousparameters such as return loss plot, gain plot, radiation pattern plot and VSWR plot are discussed. In this paper the review on various techniques of compactness by geometry on different shapes of printed slot antenna for 5G next generation wireless (NGW) mobile application are presented</span>

Stacked Textile Antenna for Multi Band Application Using Foam Substrate

The proposed article describes the new stacked design of the textile antenna. In this article a tripple wideband high directivity stacked textile antenna is proposed. The proposed antenna shows wideband performance with wide bandwidth of 18.38% covering the frequency range of 3.667GHz to 4.409GHz, 7.76% covering the frequency range of 7.2132GHz to 7.795GHz and 7.67% in the frequency range of 10.03GHz to 10.83GHz respectively. The textile material is used because it is wearable, washable, economical, and flexible & needs less care. Measured and Simulated return loss plot is presented to validate the importance of the proposed design.

Miniaturized unilateral coplanar waveguide‐fed asymmetric planar antenna with reduced radiation hazards for 802.11ac applications

ABSTRACTThis article presents a printed asymmetric planar antenna with unilateral CPW feed for smart mobile phone technology for recently developed, less crowded 802.11ac (5 GHz Wi‐Fi) applications. The unilateral CPW feed as well as asymmetric (inverted L shaped) radiating elements have been printed on low cost single sided PCB. The proposed antenna offers a wider impedance bandwidth from 4.35 GHz to 5.82 GHz, compactness of about 40.659% compared to conventional CPW‐fed antenna and reduced radiation hazards. It has been printed on a FR4‐epoxy substrate with dielectric constant (εr) of 4.4. The overall dimension of the antenna is 18 mm × 18 mm × 1.6 mm. The impact of all the geometrical parameters on return loss plots and other antenna parameters have been studied using electromagnetic simulation software High Frequency Structured Simulator 14.0. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:467–471, 2016

Microstrip Patch Antenna for Ban Applications

A microstrip patch antenna is designed for UWB (Ultra Wide Band) range i-e; 3.1GHz-10.6GHz. The antenna is particularly designed for BAN (Body are Network) applications. The substrate used is Rogers RT Duroid 5880 with thickness 1.577mm. Comparison between UWB antenna with and without body phantom is presented. It is shown that an UWB antenna can be modified and used for BAN. Radiation patterns and return loss plots are also shown.

Microstrip reflectarray with QUAD-EMC element

This paper shows the performance of a reflect array using the QUAD-EMC patch as the radiating element. The phase adjustment is made at a sub-array level by tuning the length of each driven patch. Therefore, this new design uses fewer of the required phase shifter elements. The phase diagram provides the shared phase to each QUAD-EMC unit. The return loss plot of a radiating unit excited by the microstrip line is studied. The connection between the phase diagram and the return loss plot is also discussed. Experiments have shown that we can get comparable results with those obtained by controlling the phase on each individual element. Bandwidth of 23% with 1.5 dB gain variation can be achieved when built on an FR4 substrate. The cross polarization level may be improved since there is enough room to place the straight delay lines.