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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Anatech Electronics Newsletter - November 2013

 
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Anatech Electronics has published its November 2013 newsletter. As always, it includes both company news and some tidbits about relevant industry events, regulations, and standards. This month, Sam Benzacar offers his takes on the subjects of analog voltage-tuned filters, legacy products, reverse microwaves, high-tech feature phones.

WHAT'S NEWS
 
Mouse image - RF CafeComing: The Reverse Microwave?

No, it doesn't use microwave technology, but its maker, Enviro-Cool Limited of the UK, likens it to a 'reverse-microwave' since  instead of heating quickly it cools quickly, chilling down drinks in cans and bottles to desired temperatures in 45 seconds. The patented technology, called V-Tex, has become a commercial product with the help of €930,000 ($1.28 million) from the European Commission. It may be able to reduce the cost and energy required to cool beverages in stores and vending machines by up to 90%.

Other attempts have been made to rapidly cool drinks but they have caused desirable slushing” that V-Tex avoids by agitating the liquid and rotating it to keep the carbonation in check using a "Rankine vortex." Rotating the beverage makes the vortex behave like a solid, with the outer liquid cooling faster than the inner liquid. Cooling rates were improved by collapsing the vortex and then recreating it, which is the core of the company's first patent. Other enhancements allow the vortex to be interrupted without stopping the rotation, which decreases cooling time.

The High-Tech Feature Phone Lives

The flip-phone may be relegated by the smartphone to the bottom rung of the market, but Samsung has just introduced one that bucks the trend. The SCH-W2014 is an Android 4.3 flip-phone powered by a 2.3-GHz, quad-core Qualcomm Snapdragon 800 processor with 2 Gbytes of RAM, 13-megapixel rear-facing camera, 2-megapixel front-facing camera, dual SIM card slots, 32 Gbytes of memory, and a micro SD card slot. It has a 3.7 in., 800x480-pixel Super AMOLED display. Unfortunately, it costs about $1,640.

Smartphone Sales Skyrocket

More than 250 million smartphones were shipped globally in Q3 2013, 34% of which were built by Samsung, which accounted for 83 million of them (Apple shipped a paltry 33.3 million). Nokia shipments dramatically increased to 15 million including 8.8 million of its new Lumia Windows 8 Phone models, making the company number three in the market. Overall growth was 10%, nearly twice that of the same period last year. With the holiday season approaching, growth is expected to increase even more thanks to the new Samsung Note 3, iPhone 5S, and iPhone 5C.
A Message from Sam Benzacar
 Sam Benzacar of Anatech Electronics - RF Cafe
 
Analog Voltage-Tuned Filters: Still an Excellent Solution
 
By Sam Benzacar

These days, as engineers attempt to digitize functions previously performed by analog components, it's important to remember that in some cases performing functions in the analog domain is still preferable. One of the best examples is the analog voltage-tuned filter (VTF).

Unlike digitally-tuned filters (which have their own benefits), analog VTFs tune continuously so they can settle on any frequency rather than those dictated by the minimum step size of a digitizer.

That is, they can tune to an infinite number of points anywhere within a given range, which in Anatech's VTFs is from 225 to 400 MHz. So, whether the desired frequency is 232.576 MHz or 327.926 MHz, both are achievable, which they might not be with a digitally-tuned filter.

A VTF is essentially a variable bandpass filter in which a varactor diode acts as a voltage-controlled tuning capacitor. The primary characteristic of the varactor diode (also called a Varicap, a TRW Semiconductor trademark) is its capacitance, which varies with the voltage applied to it. This DC reverse bias voltage is blocked from the tuned circuit using a blocking capacitor whose capacitance is about 100 times greater than the maximum capacitance of the diode.

A classic two-section coupled resonator bandpass VTF uses a Chebyshev topology and consists of two tank circuits tuned to a specific (center) frequency, one coupling capacitor, and two end capacitors. A varactor diode can achieve only a limited range of capacitance so it is sometimes necessary to split the desired frequency range into two bands such as 225 to 300 MHz and 300 to 400 MHz. However, high-speed switches allow the entire 225 to 400 MHz frequency range to be covered.

Anatech Electronics offers three standard VTF models: the surface-mount Model AE225-300VT90 with a frequency range 225 to 300 MHz, the Model AE225-300AVT102 amplified VTF with 20 dB gain (225 to 300 MHz), and the Model AE225-400AVT112 amplified VTF (225 to 400 MHz).

For more information, please contact us at (973) 772-4242 or by e-mail at sales@anatehelectronics.com.

Searching for Legacy Filters? - RF CafeSearching for Legacy Filters?
 

Our library of more than 5,000 filter designs allows us to quickly “re-create” filters used in existing systems with their rated specifications and in their original form factors – without huge costs for NRE. Call or e-mail us today to discuss your requirements. You can also find more information by clicking the following links:

- Custom Filter Design
- Defense Product Overview
- Bandpass Filters
- Lowpass Filters
- Highpass Filters
- Bandstop (Notch) Filters


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[borders/inc-300x250.htm]About Anatech Electronics;
Anatech Electronics, Inc. (AEI) specializes in the design and manufacture of standard and custom RF and microwave filters and other passive components and subsystems employed in commercial, industrial, and aerospace and applications. Products are available from an operating frequency range of 10 kHz to 30 GHz and include cavity, ceramic, crystal, LC, and surface acoustic wave (SAW), as well as power combiners/dividers, duplexers and diplexers, directional couplers, terminations, attenuators, circulators, EMI filters, and lightning arrestors. The company's custom products and capabilities are available at www.anatechelectronics.com and standard products are available for purchase at the Anatech Electronics Web store, AMCrf.com.


Contact:

Anatech Electronics, Inc.
70 Outwater Lane
Garfield, NJ 07026
(201) 772-4242
sales@anatechelectronics.com





Posted  November 14, 2013
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