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Microwave designs are pushing towards an all surface mount future, due to reduced assembly complexity and cost and reduced system size. Marki Microwave is pushing this technology by offering many of our designs in surface mount packages. The main question for a microwave surface mount package is the transition: how do you bring the signals from the board into the component, and back? The component must be on a substrate of some sort, and a straight wire up the side of the substrate will not generally be 50 ohms. The trick is to maintain a broadband 50 ohm impedance through the transition. Marki uses three different techniques to achieve this:

EZ6 T3A Top and Bottom

Image of T3A-EZ package

EZ eyelet – The EZ package uses a Marki proprietary technology we call an ‘eyelet’. This is a 50 ohm transition built into a metal carrier to allow a transition to a taller base height for the substrate. A suspended substrate is then attached to the carrier, allowing for surface mount suspended substrate mixers. This is the best method for transitioning to a suspended substrate part available.

Product Lines: Mixers (M1, M3, M4), Amplifiers, Doublers

Carrier MaterialTin/Lead(85/15) plated Brass

Max Recommended Frequency: 20 GHz

Suspended Substrate Compatible: Yes

Lead-Free Option: Because of the construction of the EZ eyelet, it cannot be built with lead free solder. For this reason the M1, M2, and M3 mixers are not available as lead-free surface mount units.


Image of T3-CQ package

CQ and CQG Castellation Via – A castellation via is a method of creating a transition by making a plated through hole in a circuit and cutting the through hole in half. Unlike in an EZ eyelet, it does not have a ground that transitions with it, so the transition appears as an inductive line. Further, it is limited to certain materials that are capable of supporting the construction. It is however very robust and is a visible transition, making it easier to inspect the solder fillets.

Product Lines: T3 Mixers

Carrier MaterialFR4

Max Recommended Frequency: 16 GHz

Suspended Substrate Compatible: No

Lead-Free Option: Yes (CQG)

E_sp_bt_02Bias Tee SM Package

Plated Through Hole – This is a standard way to achieve surface mount transitions. It can be performed with a wider variety of materials, including thinner and lower dielectric materials.Because it is used with thinner materials, it is typically only associated with smaller parts, to keep the board flat and prevent it from warping during assembly. Because it is used with thinner materials the transition can appear less inductive, thus performing to higher frequencies.

Product Lines: Bias Tees, Power Dividers, Diplexers

Carrier MaterialPTFE

Max Recommended Frequency: 35 GHz

Suspended Substrate Compatible: No

Lead-Free Option: Yes (SMG)

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