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Proceedings ArticleDOI

High gain stacked patch antenna with circular polarization for wireless applications

01 Mar 2017-pp 322-326
TL;DR: In this paper, a high gain stacked patch antenna is proposed in this two patches are arranged one above the other in a single substrate to achieve dual band characteristics for high gain frequency selective surface has been used.
Abstract: Circularly polarized antennas are used mostly due to the advantages over linearly polarized antennas like Mis-alignment and cross-polarization etc. In this paper, a high gain stacked patch antenna is proposed in this two patches are arranging one above the other in a single substrate to achieve dual band characteristics for high gain frequency selective surface has been used. The proposed antenna operates at band of 2.4 GHz for the application of WLAN, second antenna operates at two bands one is 2.2GHz and other at 3.6GHz. Simulation results evaluated in term of return loss, bandwidth, radiation pattern, directivity, gain and axial ratio. Gain of the antennas is 3.28 dB for trimmed square patch and 2.4 dB for inset feed antenna and 2.8 dB for centre feed antenna. For proposed antenna gain is 8.9dB at 2.2GHz and 3.9dB at 3.6GHz. Circular polarization antennas are one such a kind to their applications in satellite communications, Navigation systems, and mobile communications, proposed antenna can be used in WLAN, Wi-MAX, WPAN and RFID applications. Center frequency can be optimized; further more gain and matching can be obtained by integrating active components like diode, transistor and FET etc.
Citations
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Proceedings ArticleDOI
01 Nov 2018
TL;DR: In this paper, a microstrip patch antenna with improved bandwidth and return loss was designed, and two slots were introduced in the radiating patch, and its effect on antenna characteristics like return loss and bandwidth were observed.
Abstract: In this paper, a microstrip patch antenna with improved bandwidth and return loss is design. From the conventional circular polarized rectangular microstrip patch antenna (CP RMPA), two slots were introduced in the radiating patch, and its effect on antenna characteristics like return loss and bandwidth were observed. By introducing two slots, an enhancement in bandwidth and return loss has been achieved. From 5.8% to 6.26% bandwidth and return loss from -30.219dB to -52.54dB. Both conventional and slotted CP RMPA was designed and modeled in CST Studio software, using a FR-4 epoxy as substrate material with dielectric constant $\varepsilon$r of 4.3 and uses a coaxial probe as feed. The slot area were also varied and analyzed.

6 citations

Proceedings ArticleDOI
06 Jul 2019
TL;DR: Here, microstrip patch antenna is designed with dimension 18 mm*23 mm*1.6 mm and an optimized design further stubs are added to enhance its parameters and the results are analyzed and discuss in term of return loss, VSWR, efficiency and gain.
Abstract: In the recent years, the demand of ultra-wide band (UWB) application have been increases since it has wide range of spectrum and can be used for internet of things (IoT) application and satellite communication. It is very necessary to have very compact size of antenna for transmitting and receiving UWB signals because operating devices are getting shrink day by day. However, designing a compact size antenna with good efficiency is challenging and for this, microstrip patch antenna is suitable. Here a wideband antenna is designed with dimension 18 mm*23 mm*1.6 mm and using Fr4 material as substrate. First we studied the behavior of all shaped polygon and found an optimized design further stubs are added to enhance its parameters. Proposed wideband antenna covers frequencies ranging from 2.8 GHz to 9.4 GHz for 10 dB return loss. The results are analyzed and discuss in term of return loss, VSWR, efficiency and gain. The proposed design has a maximum gain of 3.18 dB at 8 GHz and a maximum efficiency of 97.23 percent at 3.32 GHz.

6 citations


Cites background from "High gain stacked patch antenna wit..."

  • ...Multilayer patch antenna is discussed in [12-13], where it is mentioned that gain can be enhanced by multilayered patch....

    [...]

Proceedings ArticleDOI
Qing Liu1, Guorui Han1
18 Jul 2019
TL;DR: In this article, a tri-band circular polarization antenna operating in WLAN is presented, which is composed of three stacked patches and a rectangular gap is cut in the bottom and middle patches to improve axial ratio bandwidth.
Abstract: In this paper, a novel tri-band circular polarization antenna operating in WLAN is presented. The antenna is composed of three stacked patches. Left hand circular polarization is generated by cutting off the right diagonal corners of each patch. A rectangular gap is cut in the bottom and middle patches to improve axial ratio bandwidth. The simulated results show that the bands of the antenna are 2 GHz-2.08 GHz, 2.38 GHz-2.49 GHz and 3.4 GHz-3.48 GHz. Compared with the reference antenna without rectangular gaps, the relative bandwidth increases by 4.2 times at 2.05 GHz, 2.8 times at 2.45 GHz and 1.8 times at 3.48 GHz.

1 citations


Cites methods from "High gain stacked patch antenna wit..."

  • ...In order to obtain a high gain antenna, a frequency selective surface is used to improve the radiation direction of the antenna in [7]....

    [...]

Proceedings ArticleDOI
01 Jul 2018
TL;DR: A dual-beam wearable antenna based on AMC-FSS technology with a transmission type polarizer to convert linear to circular polarization at 5.8 GHz was presented in this paper. But the antenna design is composed of three layers, an AMC substrate, a planar monopole and a tilted 45° cross-slots FSS superstrate.
Abstract: This paper presents a dual-beam wearable antenna based on AMC- FSS technology with a transmission type polarizer to convert linear to circular polarization at 5.8 GHz. The design is composed of 3 layers, an AMC substrate, a planar monopole and a tilted 45° cross-slots FSS superstrate. The structure provides a 1.69 dB of axial ratio purity polarization and a valuable gain of 7.32 dBi at the ISM band. The dual beam radiation pattern makes the antenna a good candidate for Off-Body underground communications.

1 citations


Cites methods from "High gain stacked patch antenna wit..."

  • ...A conventional circular polarization patch [10] is used to compare the achieved characteristics....

    [...]

Proceedings ArticleDOI
08 Jul 2018
TL;DR: In this article, a high gain wearable antenna with a linear to circular polarization converter is designed for underground mining communications, which achieves a realized gain of 10.21 dBi over the entire ISM band and 0.74 dB purity polarization at the resonance frequency.
Abstract: A High Gain Off-Body wearable antenna with a linear to circular polarization converter is designed for underground mining communications. The structure is made of 4 layers, an AMC substrate, a planar monopole and a meander-line polarizer converter with a FSS superstrate. At 5.8 GHz, the design achieves a bandwidth of 1.93 GHz, a realized gain of 10.21 dBi over the entire ISM band and 0.74 dB purity polarization at the resonance frequency. These results are shown to be suitable for underground mining communications.

1 citations


Cites methods from "High gain stacked patch antenna wit..."

  • ...A conventional circular polarization patch [10] loaded with a FSS superstrate (dielectric TMM13i) is used as a reference antenna to compare the achieved characteristics....

    [...]

References
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Journal ArticleDOI
TL;DR: A novel frequency-selective surface (FSS) design aimed at enhancing the performance of broad-band reconfigurable antenna apertures and of particular interest is the design of FSS structures whose reflection coefficient has prespecified phase response over a broad set of frequencies.
Abstract: We present a novel frequency-selective surface (FSS) design aimed at enhancing the performance of broad-band reconfigurable antenna apertures. In particular, reconfigurable printed dipole arrays are examined in the presence of a multilayer FSS. Of particular interest is the design of FSS structures whose reflection coefficient has prespecified phase response over a broad set of frequencies. Previous FSSs primarily considered designs on the basis of the reflection coefficient amplitude and were intended for radome applications rather than substrates. Designing FSSs subject to phase requirements is seen to require some compromise in the magnitude. Broad-band requirements also present us with a need for noncommensurate FSS designs.

172 citations

Journal ArticleDOI
TL;DR: In this article, a high-gain partially reflective surface (PRS) antenna with a reconfigurable operating frequency is presented, where an array of phase agile reflection cells on a thin substrate above the ground plane of the resonator antenna, where the reflection phase of each cell is controlled by the bias voltage applied to a pair of varactor diodes.
Abstract: A high-gain partially reflective surface (PRS) antenna with a reconfigurable operating frequency is presented. The operating frequency is electronically tuned by incorporating an array of phase agile reflection cells on a thin substrate above the ground plane of the resonator antenna, where the reflection phase of each cell is controlled by the bias voltage applied to a pair of varactor diodes. The new configuration enables continuous tuning of the antenna from 5.2 GHz to 5.95 GHz using commercially available varactor diodes, thus covering frequencies typically used for WLAN applications. Both the PRS and phase agile cell are analyzed, and theoretical and measured results for gain, tuning range, and radiation patterns of the reconfigurable antenna are described. The effect of the varactor diode series resistance on the performance of the antenna is also reported.

171 citations

Journal ArticleDOI
TL;DR: In this paper, a self-oscillating active integrated antenna with quasi-isotropic radiation was proposed, which consists of a loop radiator and an unstable transistor in direct integration.
Abstract: By placing a loop radiator over a truncated ground plane, a self-oscillating active integrated antenna with quasi-isotropic radiation is proposed in this communication. The proposed antenna comprises a loop radiator and an unstable transistor in direct integration. As the radiator is partially shielded, equivalent electric and magnetic dipole moments can be generated simultaneously, therefore giving rise to nearly uniform radiation in terms of the total electric field. The design concept is first introduced, followed by the simulation scheme and experimental results. The measured radiation characteristics support the operational principle of the proposed scheme.

44 citations

Journal ArticleDOI
TL;DR: In this article, an X-band low-phase noise planar oscillator employing the substrate integrated waveguide (SIW) active resonator is demonstrated by compensating the losses in the SIW cavity with an active feedback loop.
Abstract: An X-band low-phase noise planar oscillator employing the substrate integrated waveguide (SIW) active resonator is demonstrated By compensating the losses in the SIW cavity with an active feedback loop, the Q-factor of the SIW active resonator is greatly improved The measured results show a loaded Q-factor of 1569 and unloaded Q-factor of 8782, which is very high among other planar resonators A simplified generalised phase noise condition and its optimisation approach are proposed for the low-phase noise oscillator design To validate the proposed optimisation approach, experimental prototypes of oscillators using different design parameters and resonators are fabricated The measured results show that the optimised SIW active resonator oscillator possesses low-phase noise of −1092 dBc/Hz at 100 kHz at X-band, which is 17 and 9 dB better than the microstrip resonator oscillator and SIW passive resonator oscillator, and is comparable with the dielectric resonator oscillator measured in this study

27 citations

Journal ArticleDOI
TL;DR: In this article, a modified first iteration of Minkowski fractal geometry and applying central small square cut in the main resonator have been presented with and without inserting corner square patches.
Abstract: Objectives: To design new multi-band antennas based on patch resonator with comparative results to each other. Both antennas are compact in size and have high quality responses which can be applied in many handheld and personal communication devices. Methods/Analysis: New microstrip patch antennas based on modified first iteration of Minkowski fractal geometry and applying central small square cut in the main resonator have been presented in this paper with and without inserting corner square patches. Both antennas have designed using single layer and dual feeds to operate as multi frequency devices. The antennas have been modeled and optimized by using the Microwave Office (MWO) simulator based on the method of moments. The projected antennas have been designed using FR4 substrate with a relative dielectric constant of 4.4 and a substrate height of 1.6 mm. Compared with the microstrip patch antenna without inserting corner patches using same main patch resonator dimensions and substrate specifications, the designed antenna with corner patches exhibits more operational frequencies as well as as greater frequency ratios with respect to the first fundamental frequency. Findings: New microstrip antennas based on patch resonator with and without inserting corner patches have been proposed. The first antenna exhibits multi-frequency behavior, where resonances appear to take place at frequencies of 2.49, 3.03and 6.63 GHz, within 2 to 7 GHz frequency range. The second antenna exhibits a higher number of resonant frequencies that appear at 2.14, 2.55, 5.03, 5.81, 5.9 and 6.14 GHz respectively under same previous frequency range. The first three operational frequencies have decreased or shifted by inserting corner square patches due to increased electrical physical dimensions of the second antenna. Also, these corner patches act as EM perturbation elements to stimulate the second antenna with more resonant frequencies within 2-7 GHz frequency sweeping range. Theoretically, there is an important relation between antenna dimensions and guided wavelength. This relation specifies if antenna dimension is less than quarter guided wavelength (λg), then the antenna is impractical because radiation resistance, bandwidth and gain are decreased and therefore the antenna size is enlarged. By the way, the dimensions of Antennas 1and 2 have been found to be (0.259 λg x 0.259 λg) and (0.269 λg x 0.269 λg) respectively according to their fundamental frequencies which are satisfactory. Both antennas have small sizes and high quality responses which can be applied in many handheld and personal communication devices. Novelty/Improvement: In this paper, new multi-band antennas based on patch resonator have been proposed. The proposed resonators have been initiated from the transformed version of the first iteration of Minkowski fractal geometry. These antennas have compact dimensions with good return loss and radiation pattern performances which are desired features to be adopted in many communication devices

25 citations