Radiation pattern and input impedance of a radome-enclosed planar dipole array backed by a ground plane

2005 ◽  
Author(s):  
Wei-Jiang Zhao ◽  
Yeow-Beng Gan ◽  
Chao-Fu Wang ◽  
Le-Wei Li
Keyword(s):  
Radiation Pattern ◽  
Input Impedance ◽  
Ground Plane

scholarly journals Design of Compact Tri-Band Fractal Antenna for RFID Readers

2017 ◽  
Vol 7 (4) ◽  
pp. 2036 ◽  
Author(s):  
Mohamed Ihamji ◽  
Elhassane Abdelmounim ◽  
Hamid Bennis ◽  
Mostafa Hefnawi ◽  
Mohamed Latrach
Keyword(s):  
Radio Frequency ◽  
Radiation Pattern ◽  
Radio Frequency Identification ◽  
Input Impedance ◽  
Microstrip Antenna ◽  
Ground Plane ◽  
Physical Parameters ◽  
Fractal Antenna ◽  
Frequency Identification ◽  
Rectangular Microstrip Antenna

In this paper, a multiband and miniature rectangular microstrip antenna is designed and analyzed for Radio Frequency Identification (RFID) reader applications. The miniaturization is achieved using fractal technique and the physical parameters of the structure as well as its ground plane are optimized using CST Microwave Studio. The total area of the final structure is 71.6 x 94 mm<sup>2</sup>. The results show that the proposed antenna has good matching input impedance with a stable radiation pattern at 915 MHz, 2.45 GHz, and 5.8 GHz.

scholarly journals A New Planar Multiband Antenna for GPS, ISM and WiMAX Applications

2017 ◽  
Vol 7 (4) ◽  
pp. 2018 ◽  
Author(s):  
I. Zahraoui ◽  
A. Errkik ◽  
M. C. Abounaima ◽  
A. Tajmouati ◽  
L. E. Abdellaoui ◽  
...  
Keyword(s):  
Radiation Pattern ◽  
Patch Antenna ◽  
Input Impedance ◽  
Microstrip Line ◽  
Ground Plane ◽  
Ground Structure ◽  
Entire Area ◽  
Multiband Antenna ◽  
Measurement Results ◽  
Good Agreement

In this paper a design of a new antenna with modified ground plane is validated for multiband applications. The proposed modified ground structure is incorporated with a patch antenna to boost the performance. The antenna’s entire area is 59.5x47mm<sup>2</sup> and is printed on an FR-4 substrate and fed by a 50 Ohm microstrip line.  This structure is validated in the GPS (1.56-1.58 GHz) band at 1.57 GHz, in the ISM (2.43-2.49 GHz) band at 2.45GHz and in the WiMAX (3.50-3.56 GHz) band at 3.53 GHz. These three frequency bands have good matching input impedance for, S11≤-10 dB. The antenna presents a good performance in terms of radiation pattern, and it is designed, optimized, and miniaturized by using CST-MW whose results are compared with other solvers HFSS and ADS. The results obtained by the use of the three EM solvers are in good agreement. After realization, we have tested and validated this antenna. The measurement results of the antenna present a good agreement with the numerical results.

scholarly journals A Novel Ultrawideband Planar Inverted-F Antenna with Capacitive Ground Plane

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Haixia Liu ◽  
Fei Wang ◽  
Yang Yang ◽  
Xiaowei Shi ◽  
Long Li
Keyword(s):  
Wireless Communication ◽  
Radiation Pattern ◽  
Free Space ◽  
Input Impedance ◽  
Ground Plane ◽  
Ultra Wideband ◽  
Antenna Performance ◽  
Simulation Results ◽  
Metal Islands ◽  
Good Agreement

With the trend of the miniaturization, broadband, and integration of multisystems of wireless communication terminals, a new ultrawideband planar inverted-F antenna (PIFA) with capacitive ground plane is proposed in this paper. The capacitive ground plane is composed of a sheet of metal islands, which makes a major contribution to ultra-wideband from 2.3 GHz to 9.0 GHz by applying the capacitive compensation for input impedance of the PIFA in high-order modes frequency bands. The effect of geometric parameters of capacitive ground plane and antenna height on antenna performance is analyzed. It is found that the radiation pattern in free space and the gain of the proposed antenna also meet the demands of the wireless communication terminals. The reported antenna was fabricated and measured, and the experimental results are in good agreement with the simulation results.

scholarly journals A Circular Disc Microstrip Antenna with Dual Notch Band for GSM/Bluetooth and Extended UWB Applications

2018 ◽  
Vol 7 (2.16) ◽  
pp. 11
Author(s):  
Sanjeev Kumar ◽  
Ravi Kumar ◽  
Rajesh Kumar Vishwakarma
Keyword(s):  
Radiation Pattern ◽  
Microstrip Antenna ◽  
Ground Plane ◽  
Circular Disc ◽  
Ultra Wideband ◽  
Resonant Circuit ◽  
Frequency Range ◽  
Notch Band ◽  
Uwb Applications ◽  
Ku Band

A microstrip antenna with a circular disc design and modified ground is proposed in this paper. Circular shapes of different size have been slotted out from the radiating patch for achieving extended ultra wideband (UWB) with GSM/Bluetooth bands with maximum bandwidth of 17.7 GHz (0.88-18.6 GHz). Further, characteristic of dual notch band is achieved, when a combination of T and L-shaped slots are etched into the circular disc and ground plane respectively. Change in length of slots is controlling the notch band characteristics. The proposed antenna has rejection bandwidth of 1.3-2.2 GHz (LTE band), 3.2-3.9 GHz (WiMAX band) and 5.2-6.1 GHz (WLAN band) respectively. It covers the frequency range of 0.88-18.5 GHz with the VSWR of less than 2. Also, an equivalent parallel resonant circuit has been demonstrated for band notched frequencies of the designed antenna. The gain achieved by the proposed antenna is 6.27 dBi. This antenna has been designed, investigated and fabricated for GSM, Bluetooth, UWB, X and Ku band applications. The stable gain including H & E-plane radiation pattern with good directivity and omnidirectional behavior is achieved by the proposed antenna. Measured bandwidths are 0.5 GHz, 0.8 GHz, 1.1 GHz and 11.7 GHz respectively. 

scholarly journals Dual Strip-Excited Dielectric Resonator Antenna with Parasitic Strips for Radiation Pattern Reconfigurability

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
M. Kamran Saleem ◽  
Majeed A. S. Alkanhal ◽  
Abdel Fattah Sheta
Keyword(s):  
Radiation Pattern ◽  
Dielectric Resonator ◽  
Ground Plane ◽  
Dielectric Substrate ◽  
Open Circuit ◽  
Center Frequency ◽  
Dielectric Resonator Antenna ◽  
Excitation Scheme ◽  
Feed Network ◽  
Microstrip Feed

A novel pattern reconfigurable antenna concept utilizing rectangular dielectric resonator antenna (DRA) placed over dielectric substrate backed by a ground plane is presented. A dual strip excitation scheme is utilized and both excitation strips are connected together by means of a 50 Ω microstrip feed network placed over the substrate. The four vertical metallic parasitic strips are placed at corner of DRA each having a corresponding ground pad to provide a short/open circuit between the parasitic strip and antenna ground plane, through which a shift of90°in antenna radiation pattern in elevation plane is achieved. A fractional bandwidth of approximately 40% at center frequency of 1.6 GHz is achieved. The DRA peak realized gain in whole frequency band of operation is found to be above 4 dB. The antenna configuration along with simulation and measured results are presented.

scholarly journals UWB elliptical patch monopole antenna with dual-band notched characteristics

2019 ◽  
Vol 9 (5) ◽  
pp. 3591
Author(s):  
A H Majeed ◽  
K H Sayidmarie
Keyword(s):  
Radiation Pattern ◽  
Ground Plane ◽  
Monopole Antenna ◽  
Experimental Results ◽  
Dual Band ◽  
New Approach ◽  
Compact Size

<p class="Default">In this paper, a new approach to the design of an UWB monopole antenna with dual band-notched characteristics is presented.   The antenna has the form of an elliptical monopole over a ground plane having an elliptical slot to achieve the UWB. The dual-band notch function is created by inserting a U-shaped and a C-shaped slots on the radiating patch, thus no extra size is needed. The proposed antenna shows a good omnidirectional radiation pattern across the band from 3.2 to more than 14 GHz. The dual band-rejection is for 4.88-5.79GHz centered at 5.4GHz and 7.21-8.46 GHz centered at 7.8 GHz. The antenna prototype using the FR-4 substrate with ε<sub>r</sub>=4.3 has a compact size of 25mm×25 mm ×1.45mm. The fabricated prototype showed experimental results comparable to those obtained from the simulations.</p>

Miniaturization of Printed Microstrip Antennas Array by Using Defected Ground Structure Technique

2019 ◽  
pp. 101-146
Author(s):  
Otman Oulhaj ◽  
Amar Touhami Naima ◽  
Aghoutante Mohamed
Keyword(s):  
Computer Simulation ◽  
Radiation Pattern ◽  
Pattern Matching ◽  
Input Impedance ◽  
Microstrip Antennas ◽  
Design System ◽  
Theoretical Studies ◽  
Defected Ground Structure ◽  
Planar Antennas ◽  
Miniature Antennas

In this chapter, the authors present different techniques used to miniature microstrip antennas, particularly planar antennas array, for different applications demanding small dimensions. This will cover DGS, slot technique, and metamaterials. After the presentation of these techniques based on theoretical studies, the second part of this chapter will be about the authors' contribution in the miniaturization of microstrip antennas arrays. This part will include the presentation of some miniature antennas array which they have validated into simulation and measurement by using DGS techniques. The different structures were validated into simulation by using tow electromagnetic solvers ADS (advanced design system) and CST-MW (computer simulation technology) which permit one to validate and to verify the different performances of antennas arrays as radiation pattern, matching input impedance and small dimensions.

scholarly journals Ultralow Profile, Low Passive Intermodulation, and Super-Wideband Ceiling Mount Antennas for Cellular and Public Safety Distributed Antenna Systems

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2456
Author(s):  
Kok Jiunn Ng ◽  
Mohammad Tariqul Islam ◽  
Adam M. Alevy ◽  
Mohd. Fais Mansor
Keyword(s):  
Radiation Pattern ◽  
Public Safety ◽  
Ground Plane ◽  
Antenna System ◽  
Band Ratio ◽  
Antenna Performance ◽  
Distributed Antenna ◽  
Small Disc ◽  
Passive Intermodulation ◽  
Better Than

This paper presents an ultralow profile, low passive intermodulation (PIM), and super-wideband in-building ceiling mount antenna that covers both the cellular and public safety ultra high frequency (UHF) band for distributed antenna system (DAS) applications. The proposed antenna design utilizes a modified 2-D planar discone design concept that is miniaturized to fit into a small disc-shaped radome. The 2-D planar discone has an elliptical-shaped disc monopole and a bell-shaped ground plane, a stub at the shorting path, with asymmetrical structure and an additional proximity coupling patch to maximize the available electrical path to support the 350 MHz band range. The proposed design maximizes the radome area with a reduction of about 62% compared to similar concept type antennas. Besides, the proposed design exhibits an improved radiation pattern with null reduction compared to a typical dipole/monopole when lies at the horizontal plane. A prototype was manufactured to demonstrate the antenna performance. The VSWR and radiation pattern results agreed with the simulated results. The proposed antenna achieves a band ratio of 28.57:1 while covering a frequency range of 350–10000 MHz. The measured passive intermodulation levels are better than −150 dBc (2 × 20 Watts) for 350, 700 and 1920 MHz bands.

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