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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 http://www.rsmicro.com 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 0.00 Plaques to the following with thanks and advantage of home buying opportunities. -20.00 congratulations. We wish Yaroslav, Alam, Juana and -40.00 Dennis best wishes in their new homes. Y1 -60.00 10 Years+ Appreciation -80.00 Jovo Palavestra Liljana Rajcinoska -100.00 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: -50.00 Eugene Clegg* Filters -100.00 Ralph Wiertz* Circulators Amplifiers and Switches Y1 -150.00 *Previously in 2007 and 2008, Ralph Wiertz and Eugene Clegg were also each -200.00 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: www.rsmicro.com filter assembly of Fig. 1. way very soon! FAX: 973-492-2471 This article continues to describe four EMAIL: firstname.lastname@example.org more figures and can be read in its entirety on our website at https://www.rsmicro.com.
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