scholarly journals Perancangan Antena Super J-Pole 146 MHz Band Radio Amatir

2020 ◽  
Vol 10 (3) ◽  
pp. 155
Author(s):  
Sri Marini ◽  
Muhammad Amin Bakri ◽  
Dewangga Wicaksono
Keyword(s):  
S Parameter

Komunikasi radio merupakan komunikasi yang banyak manfaatnya dan sampai saat ini masih tetap digunakan dalam berbagai kondisi. Komunikasi dengan menggunakan transceiver rig maupun Handy Talky (HT), memiliki kelebihan dapat berkomunikasi tanpa mengenal batasan medan.  Untuk kebutuhan komunikasi yang berpindah-pindah, antena harus mudah dalam bongkar pasang, sehingga mendukung komunikasi radio tersebut. Penelitian ini merancang dan mengimplementasikan Antena Super J-Pole dengan penambahan variasi elemen setengah gelombang dan stub seperempat gelombang. Antena Super J-Pole bepola radiasi omnidirectional, tidak memerlukan groundplane, desain yang sederhana, memiliki jangkauan yang jauh dan dapat diterapkan untuk bermacam-macam perangkat radio komunikasi. Perancangan Antena menggunakan aplikasi Software CST StudioSuite 2018 serta material pipa aluminium dengan proses penyambungan overlap sehingga mudah untuk bongkar pasang, Antena bekerja pada band frekuensi VHFdi 144 MHz-148 MHz, dengan frekuensi center 146 MHZ menghasilkan bandwidth sebesar 10,96%. Antena ini memiliki nilai S-parameter -23,13 dB, VSWR 1,15 dan Gain 4,239 dB serta pola radiasi omnidirectional dengan jangkauan komunikasi sejauh 3,1 km.

Marginal RF Gain Investigation and Root Cause Determination

2013 ◽  
Author(s):  
Keith Harber ◽  
Steve Brockett
Keyword(s):  
Radio Frequency ◽  
Failure Analysis ◽  
Power Amplifier ◽  
Physical Analysis ◽  
Root Cause ◽  
S Parameter ◽  
Mode Of Operation ◽  
S Parameters

Abstract This paper outlines the failure analysis of a Radio Frequency only (RF-only) failure on a complex Multimode Multiband Power Amplifier (MMPA) module, where slightly lower gain was observed in one mode of operation. 2 port S-parameter information was collected and utilized to help localize the circuitry causing the issue. A slight DC electrical difference was observed, and simulation was utilized to confirm that difference was causing the observed S-parameters. Physical analysis uncovered a very visible cause for the RF-only failure.

Accurate measurement of the input impedance of bow-tie antenna by the S-parameter method

2016 ◽  
Vol 5 (6) ◽  
pp. 158-162
Author(s):  
Kazuma Endo ◽  
Takayuki Sasamori ◽  
Teruo Tobana ◽  
Yoji Isota
Keyword(s):  
Input Impedance ◽  
Parameter Method ◽  
S Parameter ◽  
Bow Tie

scholarly journals On the Performance Evaluation of Commercial SAW Resonators by Means of a Direct and Reliable Equivalent-Circuit Extraction

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 303
Author(s):  
Giovanni Gugliandolo ◽  
Zlatica Marinković ◽  
Giuseppe Campobello ◽  
Giovanni Crupi ◽  
Nicola Donato
Keyword(s):  
Performance Evaluation ◽  
Acoustic Wave ◽  
Equivalent Circuit ◽  
Surface Acoustic Wave ◽  
Equivalent Circuit Model ◽  
Practical Applications ◽  
Saw Devices ◽  
S Parameter ◽  
Commercial Device ◽  
Saw Resonators

Nowadays, surface acoustic wave (SAW) resonators are attracting growing attention, owing to their widespread applications in various engineering fields, such as electronic, telecommunication, automotive, chemical, and biomedical engineering. A thorough assessment of SAW performance is a key task for bridging the gap between commercial SAW devices and practical applications. To contribute to the accomplishment of this crucial task, the present paper reports the findings of a new comparative study that is based on the performance evaluation of different commercial SAW resonators by using scattering (S-) parameter measurements coupled with a Lorentzian fitting and an accurate modelling technique for the straightforward extraction of a lumped-element equivalent-circuit representation. The developed investigation thus provides ease and reliability when choosing the appropriate commercial device, depending on the requirements and constraints of the given sensing application. This paper deals with the performance evaluation of commercial surface acoustic wave (SAW) resonators by means of scattering (S-) parameter measurements and an equivalent-circuit model extracted using a reliable modeling procedure. The studied devices are four TO-39 packaged two-port resonators with different nominal operating frequencies: 418.05, 423.22, 433.92, and 915 MHz. The S-parameter characterization was performed locally around the resonant frequencies of the tested SAW resonators by using an 8753ES Agilent vector network analyzer (VNA) and a home-made calibration kit. The reported measurement-based study has allowed for the development of a comprehensive and detailed comparative analysis of the performance of the investigated SAW devices. The characterization and modelling procedures are fully automated with a user-friendly graphical user interface (GUI) developed in the Python environment, thereby making the experimental analysis faster and more efficient.

scholarly journals Single Step 2-Port Device De-Embedding Algorithm for Fixture-DUT-Fixture Network Assembly

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1275
Author(s):  
Simone Scafati ◽  
Enza Pellegrino ◽  
Francesco de Paulis ◽  
Carlo Olivieri ◽  
James Drewniak ◽  
...  
Keyword(s):  
Standard Technique ◽  
Single Step ◽  
Scattering Parameters ◽  
Linear Set ◽  
S Parameter ◽  
Parameter Conversion ◽  
Before And After ◽  
One Step ◽  
Typical Measurement

The de-embedding of measurement fixtures is relevant for an accurate experimental characterization of radio frequency and digital electronic devices. The standard technique consists in removing the effects of the measurement fixtures by the calculation of the transfer scattering parameters (T-parameters) from the available measured (or simulated) global scattering parameters (S-parameters). The standard de-embedding is achieved by a multiple steps process, involving the S-to-T and subsequent T-to-S parameter conversion. In a typical measurement setup, two fixtures are usually placed before and after the device under test (DUT) allowing the connection of the device to the calibrated vector network analyzer coaxial ports. An alternative method is proposed in this paper: it is based on the newly developed multi-network cascading algorithm. The matrices involved in the fixture-DUT-fixture cascading gives rise to a non-linear set of equations that is in one step analytically solved in closed form, obtaining a unique solution. The method is shown to be effective and at least as accurate as the standard multi-step de-embedding one.

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