Radiation characteristics of inclined slot antenna on conducting spherical cavity

2004 ◽  
Author(s):  
C. Phongcharoenpanich ◽  
D. Boonrod ◽  
M. Krairiksh
Keyword(s):  
Spherical Cavity ◽  
Slot Antenna ◽  
Radiation Characteristics

scholarly journals Design of Wideband Slot Antenna Array with Stereoscopic Differentially Fed Structures

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Guang Sun ◽  
Ge Gao ◽  
Tingting Liu ◽  
Yi Liu ◽  
Hu Yang
Keyword(s):  
Antenna Array ◽  
High Gain ◽  
Radar System ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Antenna Element ◽  
Radiation Characteristics ◽  
Wide Bandwidth ◽  
Feeding Structure

In this paper, a wideband slot antenna element and its array with stereoscopic differentially fed structures are proposed for the radar system. Firstly, a series of slots and a stereoscopic differentially fed structure are designed for the antenna element, which makes it possess a wide bandwidth, stable radiation characteristics, and rather high gain. Moreover, the stereoscopic feeding structure can firmly support the antenna’s radiation structure and reduce the influence of feeding connectors on radiating performance. Secondly, a 4 × 4 array is designed using the proposed antenna element. And a hierarchical feeding network is designed for the array on the basis of the stereoscopic differentially fed structure. For validation, the antenna element and 4 × 4 array are both fabricated and measured: (1) the measured −10 dB impedance bandwidth of the antenna element is 62% (6.8–12.9 GHz) and the gain within the entire band is 5–9.7 dBi and (2) the measured −10 dB impedance bandwidth of the array is approximately 50% (7 to 12 GHz) with its gain being 14–19.75 dBi within the entire band. Notably, measured results agree well with simulations and show great advantages over other similar antennas on bandwidth and gain.

scholarly journals Bandwidth Enhancement of Substrate Integrated Waveguide Cavity-backed Bow-tie-complementary-ring-slot Antenna using a Shorted-via

2018 ◽  
Vol 68 (2) ◽  
pp. 197 ◽  
Author(s):  
Arvind Kumar ◽  
S. Raghavan
Keyword(s):  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Substrate Integrated Waveguide ◽  
Radiation Characteristics ◽  
New Approach ◽  
Bandwidth Enhancement ◽  
The Individual ◽  
Better Than ◽  
Bow Tie ◽  
Good Agreement

In this study, a planar cavity-backed bow-tie-complementary-ring-slot antenna is proposed, and a new approach for bandwidth enhancement using a shorted-via is introduced. A shorted-via concept overcomes the narrow impedance bandwidth of a conventional substrate integrated waveguide cavity-backed antenna. By adjusting the location of the shorted-via (placed just above the centroid of the radiating slot), the individual bandwidth of the lower and higher order resonances has been tuned below -10 dB criterion, which results in the broadening of the bandwidth. Finally, the antenna is proficient to operate for an impedance bandwidth of 15.71 per cent, ranging from 12.02~14.07 GHz. The proposed antenna shows a gain of better than 4 dBi within the operating band with less than 0.5 dBi variation. Moreover, the antenna preserves good radiation characteristics, which is similar to that of the conventional metallic counterpart. To validate the simulated results, an antenna is fabricated and tested. The simulated results in terms of the reflection coefficient, gain, and radiation patterns are in good agreement with the measured results.

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 Bandwidth Enhancement on Half-Mode Substrate Integrated Waveguide Antenna Using Cavity-Backed Triangular Slot

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Dian Widi Astuti ◽  
Muhamad Asvial ◽  
Fitri Yuli Zulkifli ◽  
Eko Tjipto Rahardjo
Keyword(s):  
Waveguide Structure ◽  
Slot Antenna ◽  
Center Frequency ◽  
Substrate Integrated Waveguide ◽  
Fractional Bandwidth ◽  
Radiation Characteristics ◽  
Bandwidth Enhancement ◽  
Rectangular Slot ◽  
Design Evolution ◽  
Good Agreement

This paper proposes bandwidth enhancement of a cavity-backed slot antenna using a triangular slot on a half-mode substrate integrated waveguide structure antenna. The bandwidth enhancement was achieved by combining the fixed TE101 and the downward shifting TE102 modes, resulting in hybrid modes. The design evolution of the slot antenna from a half nonresonating rectangular slot to a triangular slot antenna increased the fractional bandwidth. The simulation result showed that fractional bandwidth increased from 6.27% to 9.1%. It was confirmed by measurement that the fractional bandwidth of 9.87% was achieved which reflects a 350 MHz bandwidth with center frequency at 3.84 GHz. The measured gain at center frequency was 4.2 dBi. It is shown that the radiation characteristics obtained from both measurement and simulation results are in very good agreement.

scholarly journals A Wideband Slotted Spherical Waveguide Antenna Based on Multi-Mode Concept

Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1656
Author(s):  
Xiaokun Bi ◽  
Shaohua Guo ◽  
Yujian Zhu ◽  
Tao Yuan
Keyword(s):  
Rectangular Waveguide ◽  
Spherical Cavity ◽  
Radiation Characteristic ◽  
High Gain ◽  
Light Weight ◽  
Fractional Bandwidth ◽  
Radiation Characteristics ◽  
Slotted Waveguide ◽  
Effective Design ◽  
Multi Mode

A wideband slotted spherical waveguide antenna based on the multi-mode concept is presented. The proposed design starts from a metallized spherical cavity fed by a rectangular waveguide. Then, two groups of slots are symmetrically cut on the shell. By suitably choosing the slot dimensions and locations, four radiation modes can be excited in a single radiator and merged with each other, resulting in a wideband radiation characteristic. To verify this, a prototype is designed and fabricated using stereolithography apparatus to achieve a light weight. As the measured fractional bandwidth (FBW) of the proposed antenna can be increased to 70.1% while maintaining stable radiation patterns and high gain, a simple and effective design of wideband slotted waveguide antennas with good radiation characteristics can be validated.

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