Posts Tagged by microwaves
IEEE FOOTHILL INVITED TO CLASTECH 2017 MEETING, FRIDAY OCTOBER 20, 2017
| October 1, 2017 | Posted by Frank Gomez under CN, COMSOC, MTT/APS |
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Notice to ALL IEEE Foothill Section Members— An INVITATION from the IEEE Coastal Los Angeles Section—- CLASTECH 2017 is coming soon—FRIDAY October 20, 2017—Meeting in LAX area CLASTECH 2017 means a full day of talks on topics in microwaves (MTT) antennas (APS) , and related areas, including COMSOC. We’ll be […]
SATELLITE COMMUNICATIONS : ACCOMPLISHMENTS AND A LOOK INTO THE FUTURE
| February 11, 2017 | Posted by Frank Gomez under COMSOC, CS, EDCAS, MTT/APS, PES |
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IEEE Foothill Section IEEE COMSOC Chapter presentation Satellite Communications: A SURVEY OF COMMUNICATIONS ACCOMPLISHMENTS AND A LOOK INTO THE FUTURE PRESENTED BY FRANK G FREYNE PhD SATURDAY, FEBRUARY 25, 2017, 9:30 AM TO NOON AT DEVRY UNIVERSITY, POMONA, 901 Corporate Center Drive Pomona, CA 91768, Room 235 SUMMARY OF […]
CLASTECH 2014 MEETING ANNOUNCED—OCTOBER 24 IN EL SEGUNDO
| September 22, 2014 | Posted by Frank Gomez under CN, COMSOC, EDCAS, MTT/APS |
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CLASTECH Preliminary Program Mark your calendar for Friday, October 24, 2014, from 8:30 AM to 3:30 PM, for the 2014 CLASTECH Symposium and Exhibition. The format will be the same as the previous years, with engaging talks, table top exhibits, and good food, for $15 early registration, or $30 onsite. […]
MT SAC STUDENTS TOUR AND LEARN AT MAURY MICROWAVE ON MAY 9, 2014
| May 26, 2014 | Posted by Frank Gomez under COMSOC, CS, EDCAS, EmpNet, General, MTT/APS |
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Here is the excellent report from Professor Jonathan Hymer of Mt San Antonia College in Walnut CA filed after their recent student visit and tour of the Maury Microwave facility near Ontario Airport, CA on May 9, 2014. You can easily detect the enthusiasm of all the My SAC […]
TOUR OF MAURY MICROWAVE BY CAL POLY POMONA STUDENTS ON MAY 2, 2014
| May 7, 2014 | Posted by Frank Gomez under CN, COMSOC, CS, EDCAS, EmpNet, MTT/APS |
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On May 2nd, six Cal Poly Pomona (CPP) students and Professor Gerald Herder (IEEE Foothill Section Secretary 2014) toured the Maury Microwave facility in Ontario California. This visit is part of an ongoing yearly effort by Maury Microwave and IEEE Foothill to introduce University Engineering students to High […]
Successful Presentation on Microwave Calibration November 14, 2013
| November 20, 2013 | Posted by Frank Gomez under COMSOC, CS, EDCAS, MTT/APS |
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Thursday, November 14, marked the date of Mr Rusty Myers return to the IEEE Foothill Section to give a talk on “Microwave Calibration Revisited”. He had earlier given such a talk in January; this was a return engagement to update a new group of IEEE Foothill Students and IEEE Members […]
Thursday, November 14, marked the date of Mr Rusty Myers return to the IEEE Foothill Section to give a talk on “Microwave Calibration Revisited”. He had earlier given such a talk in January; this was a return engagement to update a new group of IEEE Foothill Students and IEEE Members on this topic. Our IEEE Foothill group assembled, over 60 attendees strong, in a classroom / lecture hall in the new Business School Building on the Call Poly Pomona campus for a stimulating lecture.
Mr Myers was able to draw on his extensive engineering work in developing microwave calibrations at Maury Microwave in nearby Ontario, CA. Maury Microwave manufacturers an extensive line of precision microwave tools and equipment. By precision we mean calibration equipment with verification data traceable to NIST (National Institute of Science and Technology) standards. Mr Myers has hosted factory tours during the past Spring 2013 at the Maury facility for groups of students from four engineering schools in our section. Based upon the IEEE students’ questions and stated interests at these tours, he offered an updated presentation.
The issue with microwave calibration, and the need for precision in such calibration, is the requirement, for example, for other EEs designing high frequency circuits to quantify the performance of vector network analyzers (VNA). Once these are calibrated, then these VNA can be used as the workhorses in any high frequency / RF lab. Whether one is investigating wireless systems or medical RF systems or any other high frequency system, a calibrated VNA is ready to yield quantifiable results.
(A Note for IEEE Foothill Students: A quick read through a VNA manufacturers’ users guide, such as the Agilent PNA User’s Guide for Firmware A.09.90, or the HP 8510 VNA guide, will show you just what this means. If you are interviewing for an EE position, and you are in the company’s test lab, ask to see their VNA, and inquire how they are calibrating this instrument, and how they are maintaining its calibration. After this presentation, you should be ready for a good technical conversation.)
Mr Myers covered in depth the methods of calibration, including SOLT (Short-Open-Line-Thru) and TRL (Thru-Reflective-Line). The advantages and technique of these various methods was explored. For TRL, with 2 ports, and initially 12 unknowns, he explained the 10 measurements, and the resulting 8 unknowns, and how to handle this situation. Yes, it was a very thorough explanation of the theory behind the calibrations. As for the techniques needed to make a “good” calibration, an explanation of the proper torqueing of the connector, and the calibration kit supplied Maury band-color coded torque wrench, was given.
Several of the student attendees had some interesting questions for Mr Myers. Could a better “open circuit” termination be made with a “short circuit” and an airline, in place of an airline of known characteristics with an “open” end? Does the finish in the calibrated waveguides show quasi-optical effects at these stated microwave frequencies? We will let you, and our IEEE Foothill students, ponder these questions. You may consider uses of a quarter-wave “shorted” stub transformer, and examine just when raising the RF frequency to what range of values such that the RF wavelengths then become comparable to possible scattering discontinuities in the waveguide.
It was a very productive meeting for all the IEEE Foothill members in attendance. We thank My Rusty Myers for his presentation, as well as Max Cherubin, our IEEE Foothill MTT chair, and Professor Jerry Herder of Cal Poly Pomona for their organization and arrangements.
CPP Business School Lecture Hall welcomes some distinguished visitors and an important topic-Microwave Calibration
Everyone is tracking the speaker’s discussion on the Whys and Hows of the calibration