Microstrip fed annular slots in single and stacked configurations - studies of the effects of slot ground plane and back reflective plane on bandwidth and radiation characteristics

1992 ◽  
Author(s):  
L. Lavi ◽  
J. Litva
Keyword(s):  
Ground Plane ◽  
Radiation Characteristics

scholarly journals Fabrication of Hybrid Fractal Microstrip Antenna for Mobile and Wi-Max Applications

2019 ◽  
Vol 8 (11) ◽  
pp. 3373-3377
Keyword(s):  
Mobile Applications ◽  
Microstrip Antenna ◽  
Return Loss ◽  
Test Bench ◽  
Ground Plane ◽  
Low Frequency ◽  
Frequency Range ◽  
Radiation Characteristics ◽  
Directional Radiation ◽  
Feeding Technique

This paper presents the fabrication of an octagonal fractal hybrid micro strip radiator patch antenna that operates over a frequency range of 1.5 GHz to 2GHz suitable for low frequency wireless and mobile applications. The radiator has a dimension of 85x85mm2 on the radiating side and 100x86mm2 ground plane. The model is fabricated on Fire Redundant4 substrate with thickness of 1.6mm over a 10x10mm2 dimension and uses coaxial feeding technique. The model is tested for its performance in the range of 1.5 to 2 GHz on the radiator test bench consists of MIC10 antenna trainer kit with an allowable frequency of up to 2GHz. The radiation characteristics shown are having good return loss and average gain of 39dB with omni directional radiation pattern. The size is to be optimized as the dimensions are very large compared to the usual requirements.

scholarly journals Compact Multiband Microstrip Printed Slot Antenna Design for Wireless Communication Applications

2020 ◽  
Vol 9 (2) ◽  
pp. 52-59
Author(s):  
H. A. Hammas ◽  
M. F. Hasan ◽  
A. S. A. Jalal
Keyword(s):  
Ground Plane ◽  
Wireless Systems ◽  
Ring Structure ◽  
Slot Antenna ◽  
Printed Antenna ◽  
Radiation Characteristics ◽  
Antenna Structure ◽  
Annular Ring ◽  
Antenna Performance ◽  
Frequency Ratios

In this paper, a compact multiband printed antenna is proposed to cover four resonant bands in the range of 1-6 GHz. The antenna structure is inspired from that of the classical multi-cavity magnetron resonator. The antenna comprises a slot annular ring structure in the ground plane of an Isola FR4 substrate having Ԑr = 3.5 and thickness h=1.5 mm. The outer circle of the annular ring is loaded with radial arranged small circular slots. On the opposite side of the substrate, the antenna is fed with a 50-Ohm microstrip line. To investigate the effect of different antenna elements on the antenna performance, a parametric study is conducted. The antenna is simulated, fabricated, and measured. The simulated 10 dB return loss bandwidths for the four resonant bands are 35% (1.53–2.11GHz), 14% (2.9–3.34GHz), 12% (4.2–4.75GHz), and 9% (4.94–5.39GHz), respectively. Thus, the antenna is a proper candidate for many in use bands of wireless systems (1.65, 3.14, 4.44, 5.24 GHz), including LTE-FDD, GNSS, GSM-450, W-CDMA/HSPA/k, 802.11a, and IEEE 802.11ac WLAN. The results indicate that the designed antenna has quad-band resonant responses with substantial frequency ratios of f4/f3, f3/f2 and f2/f1. Besides, the antenna offers reasonable radiation characteristics with a gain of 2.5, 4.0, 6.2, and 4.2 dBi, throughout the four resonant bands.

scholarly journals Investigation on Wearable Antenna under Different Bending Conditions for Wireless Body Area Network (WBAN) Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Ismahayati Adam ◽  
Muhammad Ramlee Kamarudin ◽  
Ali H. Rambe ◽  
Norshakila Haris ◽  
Hasliza A. Rahim ◽  
...  
Keyword(s):  
Return Loss ◽  
Coupling Effect ◽  
Ground Plane ◽  
Wireless Body Area Network ◽  
Area Network ◽  
Radiation Characteristics ◽  
Antenna Structure ◽  
Wearable Antenna ◽  
Operating Frequency Range ◽  
Textile Antenna

This paper analysed the effects of bending on the performance of a textile antenna wherein the antenna under test was made of felt substrate for both industrial, scientific, and medical (ISM) band and WBAN applications at 2.45 GHz. Moreover, the conductive material was used for the patch, and the ground plane used a 0.17 mm Shieldit textile. Meanwhile, the antenna structure was in the form of rectangular, with a line patch in between elements to abate the mutual coupling effect. The measured operating frequency range of the antenna spanned from 2.33 GHz to 2.5 GHz with a gain of 4.7 dBi at 2.45 GHz. In this paper, the antenna robustness was examined by bending the structure on different radii and degrees along both X- and Y-axis. Next, the effects on return loss, bandwidth, isolation, and radiation characteristics were analysed. This paper also discovered that the antenna’s performance remained acceptable as it was deformed, and the measured results agreed well with the simulation.

A Novel UHF RFID Reader Antenna

2010 ◽  
Vol 40-41 ◽  
pp. 384-387
Author(s):  
Xin Zhang ◽  
Lei Li
Keyword(s):  
Microstrip Antenna ◽  
Return Loss ◽  
Simple Structure ◽  
Ground Plane ◽  
Uhf Rfid ◽  
Radiation Characteristics ◽  
Circularly Polarized ◽  
Rfid Reader ◽  
Reader Antenna ◽  
Simulation Results

In this paper, a new ultrahigh frequency circularly polarized microstrip antenna using in RFID reader is proposed. The proposed antenna has a simple structure, it has non-symmetrical rectangular corner truncated square patch, ground plane and a probe feed. To achieve good circular polarization(CP) radiation characteristics, it uses air as the dielectric layer. Simulation results of a constructed prototype with the center operating frequency at 923 MHz showed that the antenna has a return loss S11 of about −24 dB, a gain level of about 9.48 dBi. The antenna has good impedance and radiation characteristics over the required bandwidth, 920-925 MHz (Chinese UHF RFID band).

Triple band circularly polarized compact microstrip antenna with defected ground structure for wireless applications

2015 ◽  
Vol 8 (6) ◽  
pp. 943-953 ◽  
Author(s):  
Mukesh Kumar Khandelwal ◽  
Binod Kumar Kanaujia ◽  
Santanu Dwari ◽  
Sachin Kumar ◽  
Anil Kumar Gautam
Keyword(s):  
Circular Polarization ◽  
Ground Plane ◽  
Defected Ground Structure ◽  
Radiation Characteristics ◽  
Circularly Polarized ◽  
Left Hand ◽  
Right Hand ◽  
Defected Ground Structures ◽  
Ground Structures ◽  
Triple Band

Asymmetric slits loaded irregular shaped microstrip patch antenna with three different ground structures is proposed. All three antennas show triple band characteristics. First antenna with regular ground plane resonates at 1.95, 2.4, and 4.90 GHz with good radiation characteristics and shows right-hand circular polarization at 1.95 GHz. 18.75% of compactness is achieved with triple band characteristics. Further, same patch is used with different defected ground structures. Second antenna resonates at 1.85, 2.4, and 4.85 GHz with suppressed cross-polarization level and antenna shows right-hand circular polarization at 1.85 and 4.85 GHz. Compactness is further improved to the value of 22.91%. The third antenna resonates at 1.95, 2.4, and 4.85 GHz with better gain and radiation characteristics and antenna shows right-hand circular polarization at 1.95 and 2.4 GHz. The small frequency ratio f2/f1 is achieved and the value of f2/f1 is 1.29 and 1.23 for second and third configuration, respectively. Proposed structures show right-hand circularly polarized with suppressed left-hand circularly polarized radiations and suitable for fixed mobile wireless communication applications. All structures are analyzed using Ansoft HFSS v.14 based on finite element method and measured results satisfy the simulated results.

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