A small CPW‐fed ultra wideband antenna with dual band‐notched characteristics

Moosazadeh, Mahdi; Esmati, Zahra

doi:10.1002/mop.26847

Cited by 10 publications

(6 citation statements)

References 12 publications

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“…So, the upper portion in symmetric topology antenna is removed for further analysis and the overall dimension of the antenna is reduced to 30 mm × 24 mm from the original 30 mm × 36 mm. In the literature, there are many smaller size UWB antennas that have been presented [29][30][31][32] than the one shown here. However, the approach used in this present work achieves size reduction by observing the current distribution in an optimised UWB antenna.…”

Section: Miniaturising Of Optimised Uwb Antennamentioning

confidence: 99%

Joint optimisation of ground, feed shapes with material distributive topology of patch in UWB antennas using improved binary particle swarm optimisation

Palanisamy

Meenakshi

2018

IET Microwaves, Antennas & Propagation

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A joint optimisation of the ground plane and feed structure shapes, and the topology of radiating patch in ultra wideband (UWB) antennas are proposed. The material distributive topology of the radiating patch is configured with symmetric and asymmetric topologies. The ground plane and feed structure of antenna are optimised from a set of discrete feasible combinations. The ground plane, feed structure and radiating patch topology are identified based on the particle's position vector of the improved binary particle swarm optimisation algorithm. Based on this vector, the antenna is simulated and tested by using the MATLAB–Computer Simulation Technology (CST) co‐simulation method. The fitness value of the each particle is calculated from the return loss value evaluated by the CST and the particle's velocity and position vectors are accordingly updated. Compared to asymmetric topology, the symmetric topology antenna converges faster because of reduced search space dimension. The symmetric topology UWB antenna is further miniaturised to occupy an area of 720thinmathspacemnormalm2 from 1080thinmathspacemnormalm2 based on the observation of surface current distribution. The measurement results of the fabricated prototypes confirm that all the three antennas yield good impedance matching over the UWB band with better pulse preserving capability.

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Section: Miniaturising Of Optimised Uwb Antennamentioning

confidence: 99%

Joint optimisation of ground, feed shapes with material distributive topology of patch in UWB antennas using improved binary particle swarm optimisation

Palanisamy

Meenakshi

2018

IET Microwaves, Antennas & Propagation

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“…The major challenge and novelty comes from the development of the UWB antennas for these systems with relatively small dimensions and high performance. For example, the engineering/design tradeoff is between small UWB antennas that are omnidirectional [12][13][14] and directional UWB antennas [15], such as horn antennas, that are bulky. The Vivaldi antenna is an attractive candidate for microwave and millimetre wave imaging applications due to its planar structure, low profile, light weight, and theoretically infinite bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Microwave and millimetre wave antipodal Vivaldi antenna with trapezoid‐shaped dielectric lens for imaging of construction materials

Moosazadeh

Kharkovsky

Case

2016

IET Microwaves, Antennas & Propagation

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High‐quality microwave and millimetre wave imaging of construction materials and structures requires ultra‐wideband (UWB) techniques to provide high‐range resolution as well as a reasonable penetration depth. A modified compact microwave and millimetre wave UWB antipodal Vivaldi antenna is designed and presented in this study. First, the conventional antipodal Vivaldi antenna is designed as a reference antenna. Then, to provide the desired frequency range (3.4–40 GHz) with increased gain at its lower frequencies, the slit edge technique is applied, thus creating a periodic slit edge antipodal Vivaldi antenna (PSEAVA). Finally, a trapezoid‐shaped dielectric lens (TDL) as an extension of the substrate is added and optimised to increase gain and directivity at higher frequencies of the frequency range, creating PSEAVA with a TDL (PSEAVA‐TDL). The results show that the PSEAVA‐TDL has the highest gain (up to 16 dB) and front‐to‐back ratio (up to 37.5 dB), and the narrowest half power beamwidth (down to 11.7°). A prototype of the proposed PSEAVA‐TDL with compact size of 40 × 90 × 0.508 mm3 is fabricated and applied for the imaging of samples made of construction materials. High‐range resolution images of the samples are obtained with this antenna by using synthetic aperture radar algorithm.

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“…It should be mentioned that 3.3–3.8 GHz is used for WiMAX application and IMT advanced system or fourth generation (4G) mobile communication system in the range of 3.4–4.2 GHz. IEEE 802.11a standard is considered 5.15–5.35 GHz and 5.725–5.825 GHz as transmitting and receiving band, respectively, IEEE 802.11bg applied 2.4 GHz (2.4–2.484 GHz) for WLAN application . We need to design small size, easy fed, and low cost antenna for multiband applications, and slot antenna is known for wireless applications with all prosperities that are need for WLAN communication system and it is a good choice for these applications .…”

Section: Introductionmentioning

confidence: 99%

Microstrip slot antenna applications with SRR for WiMAX/WLAN with linear and circular polarization

Zarrabi

Mansouri

Ahmadian

et al. 2015

Microw. Opt. Technol. Lett.

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half-power angle in the vertical plane is 5.4 (q 5 624.0399). The height of the reception point is h 5 2.5 m. Measurements were conducted using a transmitter antenna tilt of 6 and 10 . The estimated slope of the street was 3.8 . The propagation environment is a canyon street and, therefore, the COST-WI model for free space properly represents the propagation environment (c 5 2.6). Considering the tilt of 10 , (1) gives X exp max 5 78 m and (5) states that the maximum location of exposure to electromagnetic fields should be found in the interval (64 m, 99 m). The measured maximum exposure location is at X 5 67 m, within the calculated region. Considering a tilt of 6 , X exp max 5 105 m and the region calculated using Eq. (5) is in the interval (82 m, 145 m). The measured maximum exposure location is at X 5 107 m. CONCLUSIONThis letter proposes a method to calculate the region that contains the location of maximum exposure to RF EMF. In real environments, this point can be some dozens of meters far from the point estimated using (1). When evaluating the field strength at X exp max , if the measurements were close to the established limit, the location can be considered compliant, even if the radiocommunication station is not, once the field strength at other point may be higher than the limit. Thus, it is necessary to assess the field strength in the region R around X exp max and perform spatial averaging appropriately. The method proposed in this letter shows how to define this region. Results show that the proposed method is compatible with field measurements data. 2.

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A small CPW‐fed ultra wideband antenna with dual band‐notched characteristics

Cited by 10 publications

References 12 publications

Joint optimisation of ground, feed shapes with material distributive topology of patch in UWB antennas using improved binary particle swarm optimisation

Joint optimisation of ground, feed shapes with material distributive topology of patch in UWB antennas using improved binary particle swarm optimisation

Microwave and millimetre wave antipodal Vivaldi antenna with trapezoid‐shaped dielectric lens for imaging of construction materials

Microstrip slot antenna applications with SRR for WiMAX/WLAN with linear and circular polarization

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