A HIGH GAIN ANTENNA WITH FRACTAL SLOT FOR ISM BAND

2018 ◽  
Vol 18 (6) ◽  
pp. 841-848
Author(s):  
Ajay Abrol ◽  
Shyam S. Pattnaik ◽  
Balwinder Singh Dhaliwal
Keyword(s):  
High Gain ◽  
Ism Band ◽  
High Gain Antenna

scholarly journals High gain antenna at 915 MHz for off grid wireless networks

2020 ◽  
Vol 9 (6) ◽  
pp. 2449-2454
Author(s):  
Hussam Hamid Keriee ◽  
Mohamad Kamal A. Rahim ◽  
Nawres Abbas Nayyef ◽  
Zahriladha Zakaria ◽  
Ahmed Jamal Abdullah Al- Gburi ◽  
...  
Keyword(s):  
Wireless Networks ◽  
High Gain ◽  
Ism Band ◽  
Network Applications ◽  
High Gain Antenna ◽  
Rectangular Patch ◽  
Gap Technique ◽  
Low Profile ◽  
Planar Substrate ◽  
Compact Size

This paper presents a high gain antenna for off-grid wireless networks at 915 MHz. The requirements for compact size and high gain antenna are needed in the industrial, scientific and medical (ISM) band for better performance and coverage. Hence, microstrip planar substrate is proposed to overcome the size challenges. The proposed antenna is designed based on rectangular patch with air gap technique. The proposed antenna is optimized using computer simulation technology software (CST) and fabricated on low profile FR-4 substrate. The measured performance agreed well with the simulated one. The reflection of less than -10 dB is obtained with high gain of 6.928 dB at desired frequency. Overall, this antenna can be a good candidate for the off-grid wireless network applications. 

scholarly journals A Method for Measuring the Maximum Measurable Gain of a Passive Intermodulation Chamber

Electronics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 770
Author(s):  
Zhanghua Cai ◽  
Yantao Zhou ◽  
Lie Liu ◽  
Francesco de Paulis ◽  
Yihong Qi ◽  
...  
Keyword(s):  
Approximate Method ◽  
Path Loss ◽  
High Gain ◽  
Directional Antenna ◽  
Anechoic Chamber ◽  
Measurement Interval ◽  
High Gain Antenna ◽  
Specific Relationship ◽  
Method Of Measurement ◽  
Passive Intermodulation

This paper presents an approximate method that allows the calculation of the maximum measurable gain (MMG) in an anechoic chamber. This method is realized by using a low passive intermodulation (PIM) medium-gain directional antenna. By reducing the distance between the antenna and the wall of the chamber to reduce path loss, the purpose of replacing a high-gain antenna with a medium-gain antenna is achieved. The specific relationship between distance and equivalent gain is given in this paper. The measurement interval is determined by the 3 dB beamwidth of the measurement antenna to scan the whole chamber. A set of corresponding data for the residual PIM level and the MMG of the chamber can be obtained by the method of measurement outlined herein. The feasibility of this method was verified by measurements in two PIM measurement chambers.

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