Measurement of Dielectric Constant of Soil Near Berhampur District of Orissa State at X-Band Frequency

2015 ◽  
Vol 97 (3) ◽  
pp. 381-383
Author(s):  
Naresh Kant Chandan ◽  
Sidhatri Kumar Srivastava
2014 ◽  
Vol 893 ◽  
pp. 488-491 ◽  
Author(s):  
Elfarizanis Baharudin ◽  
Alyani Ismail ◽  
Adam Reda Hasan Alhawari ◽  
Edi Syams Zainudin ◽  
Dayang L.A. Majid ◽  
...  

This paper presents the results on dielectric properties of pulverized material based on agricultural waste namely oil palm frond and pineapple leaf fiber for microwave absorber application in the X-band frequency range. The investigation is started by identifying the pulverized materials permittivities and loss tangents using coaxial probe technique, followed by density measurement comprising the determination of bulk and solid densities. Then, by using dielectric mixture model, the solid particle dielectric properties were determined. It is observed that the air properties give quite an effect on the permittivity and loss tangent of the pulverized materials. It is also found that the lower the material density the higher material dielectric constant will be. Furthermore, the results show that, both oil palm frond and pineapple leaf fiber are potential to be X-band absorber with average dielectric constant of 4.40 and 3.38 respectively. The loss tangents for both materials were observed to be more than 0.1 which mark them as lossy materials.


Author(s):  
Akanksha Lohia ◽  
Jyotsna Pal ◽  
Nishi Kushwaha ◽  
Supriya Shreevas

The chapter explores a racket shaped antenna that operates in triple band frequency configuration. The main advantage of this antenna is that the design uses wearable textile material as a substrate. Here, jeans material is used as a substrate whose dielectric constant is 1.7 and thickness is 1mm. The designing and simulation are done with the help of CST software. The anticipated antenna operates in C-band and X-band providing three resonant frequencies 7.335GHz, 8 GHz, and 8.38 GHz. Different analyses have been done using CST software based on parameters like return loss, radiation pattern, smith chart, polarization, etc. For obtaining the best result, parametric study has also been done by varying the geometry of the design.


2022 ◽  
Vol 23 (1) ◽  
pp. 60-67
Author(s):  
Sarah Yasmin Mohamad ◽  
Noralya Fatin Muzamil ◽  
Norun Farihah Abdul Malek ◽  
S.M.A Motakabber ◽  
Rafidah Abd Malik ◽  
...  

In this paper, a microstrip patch antenna is designed to be used for X-band VSAT application at 7.5 GHz. The antenna is proposed to replace the massive and commonly used parabolic reflector antennas (46.0 inch × 29.3 inch × 13.5 inch (116.84 cm × 74.42 cm × 34.29 cm) with weight of 66.2 kg) in terms of portability due to its compact and lightweight features, with overall dimensions of 19.00 mm × 30.55 mm. The 7.5 GHz frequency is chosen based on the X-band frequency used in Malaysia, as reported by STRIDE. The microstrip patch antenna is first designed and simulated using CST Microwave Studio (CST MWS) and exhibits a good return loss (S11) of -42.09 dB, a bandwidth of 399 MHz, directivity of 7.63 dB and gain of 7.18 dB. The antenna is then fabricated using RT/duroid ® High Frequency 5880 substrate with a dielectric constant of ?r = 2.2, loss tangent of ? = 0.0009 and thickness of t = 1.574 mm. Next, the return loss and radiation pattern measurements are carried out to confirm the simulated results. The measurement of the antenna prototype provides a return loss S11 of -30.53 dB, bandwidth of 455 MHz, directivity of 5.51 dB and gain of 3.88 dB. ABSTRAK: Di dalam kajian ini, antena jalurmikro dicadangkan untuk tujuan aplikasi jalur-X VSAT pada 7.5 GHz. Antena jalurmikro ini dicadangkan untuk menggantikan antena reflektor parabola yang besar dan biasa digunakan (46.0 inci × 29.3 inci × 13.5 inci (116.84cm × 74.42cm × 34.29cm) dengan berat 66.2kg), kerana cirinya yang mudah alih dengan fizikalnya yang kecil dan ringan, dan dimensi keseluruhan 19.00 mm × 30.55 mm. Frekuensi 7.5 GHz dipilih berdasarkan frekuensi jalur-X yang digunakan di Malaysia, seperti yang dilaporkan oleh STRIDE. Antena jalurmikro ini direka dan disimulasi menggunakan perisian CST Studio Gelombang Mikro (CST MWS) dan menghasilkan kehilangan pulangan yang baik S11 -42.09 dB, lebar jalur 399 MHz, keterarahan 7.63 dB dan gandaan 7.18 dB. Antena jalurmikro ini kemudiannya direalisasikan dengan menggunakan substrat RT / duroid ® Frekuensi Tinggi 5880 dengan pemalar dielektrik ?r = 2.2, tangen kehilangan ? = 0.0009 dan ketebalan t = 1.574 mm. Seterusnya, pengukuran kehilangan pulangan dan corak radiasi dilakukan untuk mengesahkan keputusan simulasi. Pengukuran prototaip antena jalurmikro menunjukkan kehilangan pulangan S11 -30.53 dB, lebar jalur 455 MHz, keterarahan 5.51 dB dan gandaan 3.88 dB.


RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 20256-20264 ◽  
Author(s):  
Rajeev Kumar ◽  
Ashish Gupta ◽  
Sanjay R. Dhakate

Carbon foam decorated with magnetic and dielectric nanoparticles exhibited significantly improved EM radiation absorption in the X-band frequency region.


2021 ◽  
Author(s):  
Yuwei Zhang ◽  
Awei Zhang ◽  
Chenkai He ◽  
Chunya Hou ◽  
Jinping Xu

2014 ◽  
Vol 30 (2) ◽  
pp. 419-425 ◽  
Author(s):  
Adriano Luiz de Paula ◽  
Marcelo Bender Perotoni ◽  
Adriana Medeiros Gama ◽  
Luiz Alberto de Andrade

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