IN MY OPINION

Interconnect Advances Fuel Technology Growth
By Orwill Hawkins, Vice President of Marketing, LadyBug Technologies

With increased frequencies, higher data rates, and lower noise levels, the microwave industry serves as a leader in technological capability. Demand for quality interconnects has increased right along with other higher-performance areas in the industry.
Read More...

MILITARY MICROWAVE DIGEST


MMD March 2014
New Military Microwave Digest

ON THE MARKET


E-Band Active X5 Multiplier
Model SFA-743843516-12SF-N1 is an E-band X5 active multiplier with center frequency at 79 GHz with minimum +/-5 GHz operational bandwidth. It converts 14.8 to 16.8 GHz/+5 dBm input signal to deliver 74 to 84 GHz frequency band with more than +16 dBm power.
Sage Millimeter

Hand-Flex™ Coaxial Cable
Covering DC to 12.5 GHz, this 8” coaxial cable, 141-8SMNB+, has a bulkhead Female Type-N connector at one end and SMA-Male at the other. Features include low loss, excellent return loss, hand formable, and an 8mm bend radius for tight installations.
Mini-Circuits

Phase Trimmer Series
This new phase trimmer series is designed for RF applications where phase match between two cables is needed for proper system performance. Phase trimmers, offered from DC to 50 GHz, will give an accurate phase adjustment over a specified frequency range.
RLC Electronics

Planar Monolithics Industries
Model PTRAN-100M18G-SFB-3UVPX-MAH is a transceiver covering the frequency range of 100 MHz to 18 GHz. The transceiver fits into a 3U Open VPX form factor utilizing the high speed VITA 67 RF connector.
Planar Monolithics Industries

SMT High-Power Attenuators
Now available with full design support capabilities are three new SMT high-power attenuators from Anaren. These 30 to 50W devices are high-performance, high-power chip attenuators covering DC to 3.0 GHz and feature high return loss and small footprints.
Richardson RFPD

See all products in this issue


January 2013

Manufacturing Friendly Circulator with Low Insertion Loss
By Brian Hartnett, Skyworks Solutions, Inc.

Skyworks has successfully developed a manufacturing-friendly circulator with industry leading insertion loss performance. The SKYFR-000827 operates in the frequency band 2300MHz to 2400MHz and has a typical insertion loss of just 0.10dB. The device is housed in a surface mount, ‘robust lead’ package and shipped in tape-and- reel.

Figure 1: SKYFR-000827 image

The traditional drop-in circulator is inadequate for the modern pick-and-place assembly line. The drop-in circulator requires a production operator to physically remove each device from the packing tray and place it onto the customer’s PCB. The operator must then install the circulator using screws and manually solder the leads to the PCB. Deformed leads and poor manual solder joint quality are reoccurring problems.

Figure 2: SKYFR-000827 insertion loss over operating temperature range

Skyworks’ patented ‘robust lead’ package allows the circulator to be populated onto the customer’s PCB using modern surface-mount technology. The robust lead circulator is shipped in tape-and- reel for automated placement. The package uses a unique vertical lead to connect the center conductor of the circulator to the customer’s PCB. The gold plated lead is firmly encased inside a high temperature plastic, insuring a robust design and excellent co-planarity. The main body of the device is plated with silver for excellent solderability and can be attached to the PCB using a standard reflow profile.

Figure 3: SKYFR-000827 isolation over operating temperature range

The surface-mount robust lead circulator is extremely reliable, which has been confirmed by numerous reliability tests, including thermal shock, humidity, vibration and high temperature soak. In one case, robust lead devices were subjected to 12,000 temperature cycles (0°C to 100°C, 10 minute dwell) without a single solder joint failure. The part will also withstand up to 200W of CW RF power when mounted on a PCB with good thermal grounding. See Skyworks application note 201790, Robust Lead Circulators and Isolators, for more information.

Table 1: SKYFR-000827 Intermodulation Distortion

The insertion loss of the output circulator of a power amplifier is critical. It is estimated that every 0.1dB of insertion loss at the power amplifier output cost >3W of RF power further up the chain. Our engineering teams have successfully developed new manufacturing processes for the ferrite disk, resulting in circulator designs with industry leading insertion loss performance.
The SKYFR-000827 is a single junction circulator in a 25mm diameter housing (see Figure 1), designed to operate in the standard band of 2300 MHz to 2400 MHz. This circulator can achieve insertion loss performance of better than 0.15dB over the operating temperature range of -40°C to +105°C. The isolation and the return loss are typically at least 25dB and the intermodulation distortion (IMD) performance is better than 70dBc with two 40W CW tones. See Table 1 for IMD data.

Figure 4: SKYFR-000827 input return loss over operating temperature range

The key to achieving this very low insertion loss is the ferrite/dielectric disk. The ferrite and dielectric materials are selected to guarantee the best possible performance from Trans-Tech’s range of low linewidth magnetic materials and low loss D2000 series dielectric materials. The materials are then paired into a co-fired garnet/dielectric ring assembly, a patented process in which both materials are processed simultaneously and the net result is a joint with no air gap and no lossy glue.  These two factors, plus the excellent transmission and reflection s-parameters of the device, combine to give the very low insertion loss performance.

Figure 5: SKYFR-000827 output return loss over operating temperature range

Figures 2, 3, 4 and 5 show the s parameter performance of the SKYFR-000827 over temperature. This part is a manufacturing friendly design with industry leading insertion loss performance. The outstanding insertion loss is the result of improved manufacturing processes of the ferrite disk and careful magnetic and electrical design in the circulator junction. The device is housed in a surface mount ‘robust lead’ package and shipped on tape-and- reel, making it ideal for today’s surface-mount assembly processes. Skyworks is currently developing low insertion loss circulators for all wireless infrastructure frequency bands.

For more information, visit our website.

Skyworks Solutions, Inc.
www.skyworksinc.com
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FROM WHERE WE SIT

Uncertain Times for DefenseIn Defense of DARPA; Lamenting Bell Labs
By Barry Manz

A federal agency like DARPA is a sitting duck for politicians and assorted other critics. It has come up with some truly bizarre programs over years that ultimately either delivered no tangible results, were canceled before they could cause any damage, or attempted to answer questions that nobody was asking or needed answers to. Read More...


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