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2004 Newsletter


									Volume 11 Issue 1                    “We Duplicate what We Simulate”™                                             Annual Issue 2009
                                                2009 at RS
    ♦♦♦♦♦♦                                             ♦♦♦♦♦♦                                       ♦♦♦♦♦♦
This Issue’s Feature                               -    Reduced size waveguide sections:
                                                     reduced size rectangular or ridged
                                                                                                        Company News
Unique Waveguide Bandpass                            waveguide sections are used at the filter     Microwave Doctoral Student Visits
                                                     sides to reject higher order modes
Filters with Wide Stopbands                          propagation and for further suppression
                                                     of the dominant mode in the lower
Low insertion loss bandpass filters with             stopband.                                     Simone                        Bastioli from
wide spurious free stopband are usually                                                            the                           University of
realized by cascading a bandpass                  Fig.1 shows the design of a bandpass
inductive iris-coupled TE101 mode cavity          filter assembly, including a 90 degree H-        Perugia paid                  us a visit this
filter (BPF) and a broadband quasi-               plane bend, at 20.7 GHz. The interfaces          summer       as               part of his
lowpass filter (LPF), such as waffle iron,        are standard WR-42. The filter order is          doctoral                      research. His
corrugated,       or     ridged    waveguide      six: the first and last cavities are semi-       dissertation                         advisor,
evanescent mode filter. While the BPF             lumped corrugated resonators, while the          Professor Roberto Sorrentino, a colleague of
provides the filter selectivity on a              other four cavities are TE101 mode
                                                  resonators coupled through capacitive            Dr. Snyder, recommended him for the visit.
relatively      narrowband       basis,     by
employing high Q-factor resonators, the           irises. Two E-plane stubs (notch                 Simone’s doctoral thesis area is in
quasi-LPF is used to reject the BPF’s             elements) are associated with the first and      innovative waveguide filters using ridge
harmonics. Such a LPF employs                     last resonator. The H-plane 90 degree            resonators, which are the subject of many of
relatively low Q-factor resonators and has        bend is interfaced with two reduced width        his previous publications.
a wide passband. In this way, the overall         waveguide sections that avoid the
loss is the sum of the losses of the two          transmission of the TE20 mode within the         Dr. Snyder has been pleased to assist
cascaded        filters.     For    receiving     required stopband.                               Simone in practical aspects of his technical
application, this could be not good                                                                studies while here. Simone has gained
enough to guarantee the required radio-                                                            valuable insight for his work and the
link performance.
                                                                                                   microwave field from consultation with Dr.
RS Microwave developed new non-                                                                    S. and the engineering staff here. He has
conventional designs for high Q-factor
waveguide BPFs that provide a wide                                                                 seen how RS Microwave and all its
spurious free stopband without needing a           Fig. 1: Wide spurious free waveguide bandpass   employees participate in a complex process
                                                             filter assembly (20.7 GHz)
cascaded quasi-LPF, thus reducing the                                                              that solves a customer problem, each
insertion loss performance with respect to                                     (cont’d p.2 )       making a unique and specific contribution
the conventional approaches. The designs                                                           resulting in an “ideal”, not just “working”,
take into account also the rejection of the                                                        filter for a myriad of important applications.
higher order modes.
Different concepts are implemented in the         Our Latest Technical                             Besides his research experience, Simone has
filter design:
   - Capacitive irises instead of inductive
                                                    Developments                                   thoroughly enjoyed his stay in the U.S.
                                                                                                   including our American hospitality,
   irises: a capacitive iris is itself as a       A report from Yaroslav Krishtal tells of         barbecues, Duncan Donuts, 4th of July, New
   lowpass element and provides better            RS Microwave’s current work on a new             York and the Yankees! In his own words:
   spurious       performance      at    high     prototype high frequency switch using the
   frequency;                                                                                      “I would like to thank everybody at RS
                                                  latest MMIC technology. One of the
   - Wider cavities: the width of the             goals is to be able to manufacture high          Microwave who made me feel like I was at
   cavities is dimensioned for suppression        frequency, low cost switches using off the       home. I will not forget them and their
   of low frequencies spurious (generated         shelf surface mount components. Parallel         kindness.”
   by the capacitive irises), and for             to that effort, we are investigating the
   moving most of the high frequency              possibility of expanding the manufacture
   harmonics within prescribed frequency          of extremely small size components such               2009 MTT International
   ranges. The width of the cavities can          as beam lead diodes using wire bonding                      Symposium Followup
   also     change       along    the    filter   techniques. Resultant success will open a        While no real winner was declared in the
   (inhomogenous approach).                       wide array of possibilities for in-house         debate of the century on the technology
   - Input/output semi-lumped resonators:         manufacture      of    these    microwave        known as "metamaterials", it appears that
   short sections of corrugated waveguide         components, expanding product offerings          the filter and network experts won the day
   with associated input notch elements           while keeping manufacturing costs low.           over readiness of “Harry Potter type”
   are used as first and last resonators of       In addition, work is progressing on adding       invisibility. The jury is out on the next steps
   the filters. The input/output corrugated       to our high power test capability. The           the erudite colleagues will take.
   resonators provide significant harmonic        high power amplifier presently under
   suppression while do not affecting
   dramatically the filter insertion loss; the    construction will be capable of providing
                                                  CW signal in excess of 300 Watts in
                                                                                                      Visit Us On The Web!
   associated notch elements provide              VHF/UHF band.           The amplifier is      
   further suppression on prescribed              scheduled      for     use    this    Fall.
   frequency ranges.
         2                                                                                                                                                            RS Microwave Company, Inc.

                     ♦♦♦♦♦♦                                                                                                                                ♦♦♦♦♦♦                                       ♦♦♦♦♦♦
       This Issue’s Feature                                                                                                                             Employee Milestones                              Personnel News
                                                        (cont’d from p.1)
                                                                                                                                                                                                        Look who joined us in 2009!
Fig. 2 shows the HFSS simulation of the
assembly. The pass band is 20.2 – 21.2
GHz. Concerning the stopband, not less
than 60 dB rejection are simulated up to
47 GHz, that is 2.3 times the filter center
frequency (1.6 is usually accomplished                                                                                                                                                               Terry Pearson joined us after a long term
with ordinary waveguide bandpass                                                                                                                                                                     temp assignment with us. A formal
filters). No lower stopband spurious are                                                                                                                                                             welcome to her.
present above -50 dB transmission. The
simulated pass band insertion loss
considering ideal copper surfaces is about
                                                                                                                                                        In recognition and appreciation of our
0.2 dB: an equivalent design employing a                                                                                                                                                             In other news, Rosa Kotevska is a
                                                                                                                                                        longtime employees and their years of
cascade of a conventional BPF and a                                                                                                                                                                  grandmother for       the   second     time.
                                                                                                                                                        dedicated loyal service, RS has held a
quasi-LPF would lead to roughly 0.4 dB                                                                                                                                                               Congratulations!
                                                                                                                                                        ceremony publicly awarding Certificates
simulated insertion loss.
Ansoft Corporation                                                       XY Plot 2                                               HFSSDes ign1           of Appreciation and Service Award            And, many of employees are taking
                                                                                                                                                        Plaques to the following with thanks and     advantage of home buying opportunities.
       -20.00                                                                                                                                           congratulations.                             We wish Yaroslav, Alam, Juana and
                                                                                                                                                                                                     Dennis best wishes in their new homes.

       -60.00                                                                                                                                                   10 Years+ Appreciation
                                                                                                                                                                    Jovo Palavestra
                                                                                                                                                                   Liljana Rajcinoska
           14.00             18.00             22.00
                                         Curv e Inf o
                                                            26.00        30.00    34.00
                                                                           Freq [GHz]
                                                                                                 38.00      42.00        46.00      50.00                              Pavel Sirka
  Fig. 2: HFSS simulation of the filter assembly of
                                                                                                                                                                     Valerie Snyder                  RS Products In Brief
                      Fig. 1.
                                                                                                                                                                15 Years+ Appreciation                    Filters - 1 MHz to 40 GHz
Fig. 3 shows a multimode HFSS                                                                                                                                       Ginny Van Ess                            High Power - Low Loss
simulation (TE01, TE20, and TE30 are                                                                                                                                Howard Booth                              Blind-Mate - Drop In
considered) demonstrating that the higher                                                                                                                           Richard Mann                               Dielectric Resonator
order modes are suppressed as well below                                                                                                                              Sveto Jojic                                 Notch Filters
-50 dB transmission up to 47 GHz: this is                                                                                                                                                                      Coax or Waveguide
of crucial importance when the filter is                                                                                                                       20 Years+ Service Awards                    Tunable, Higher Order Mode
implemented      within    a     complex                                                                                                                                                               Multiplexers - 1 MHz to 40 GHz
waveguide assembly in which higher                                                                                                                                    Larry Jobes
order modes can be excited and feed the                                                                                                                                Pero Jojic                                  Contiguous
                                                                                                                                                                                                                 Non - Contiguous
filter.                                                                                                                                                               Kevin Keck                                    Switched
Ansoft Corporation                                                         XY Plot 3                                             designmanufacturing1

          0.00                                                                                                                                                        Helen Rupp                       Subsystems - 1 MHz to 20 GHz
                                                                                                                                                                     Charlie Rupp
                                                                                                                                                                                                             Combinations, including:
                                                                                                                                                                    Eugene Clegg*                                    Filters
                                                                                                                                                                     Ralph Wiertz*                                Circulators
                                                                                                                                                                                                             Amplifiers and Switches

                                                                                                                                                        *Previously in 2007 and 2008, Ralph
                                                                                                                                                        Wiertz and Eugene Clegg were also each
                                                                                                                                                        shown the Company’s appreciation and           RS Microwave Co., Inc.
                                                                                                                                                        feted in honor of their Quarter Century
     -250.00                                                                                                                                                                                                 22 Park Place - P.O. Box 273
                 22.00   24.00   26.00        28.00      30.00   32.00   34.00     36.00 38.00
                                                                                 Freq [GHz]
                                                                                                 40.00   42.00   44.00   46.00   48.00      50.00
                                                                                                                                                        of Dedicated Service to RS Microwave.
                                                                                                                                                                                                                  Butler, NJ 07405
                                                                                                                                                        A few employees above are coming up on
  Fig. 3: Multimode HFSS simulation (TE01, TE20,                                                                                                                                                                   973-492-1207
  and TE30 are considered) of the stopband of the                                                                                                       a quarter century of service and we plan
                                                                                                                                                        to show them our appreciation in a special        INTERNET:
              filter assembly of Fig. 1.
                                                                                                                                                        way very soon!                                        FAX: 973-492-2471
This article continues to describe four                                                                                                                                                                   EMAIL:
more figures and can be read in its
entirety    on     our    website    at

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