Whether can the electrode material of filter of Zhuo Shengwei MAX-SAW affect its performance?

The electrode data of filter of Zhuo Shengwei MAX-SAW exists to be affected significantly to its function, this is the element that needs to think mainly in SAW filter design, material effect reflects in the following crucial aspects:

1.To the influence of frequency character

• Velocity of sound and frequency deflection: The transmission rate that the physical character such as quantity of the density of electrode material, stretch model can affect surface acoustic wave to go up in underlay directly. Different metal (wait like Al, Cu, Au) acoustical impedance and underlay material (the POI underlay that uses like Zhuo Shengwei MAX-SAW) match degree to differ, can bring about sound wave to transmit rate change, cause the deflection of filter center frequency then. For example, high density metal electrode may reduce velocity of sound, make frequency on the low side; And light qualitative metal electrode makes possibly frequency on the high side.
• Frequency temperature coefficient (TCF): Of the hot coefficient of expansion of electrode material and underlay match degree, the frequency stability when can affecting filter to change in temperature. The heat that is like electrode and underlay expands difference is bigger, the possibility when temperature is fluctuant arises stress, bring about frequency deflection to increase, reduce TCF performance. Zhuo Shengwei MAX-SAW emphasizes temperature stability, figure the heat of its electrode material and POI underlay matchs a course to optimize, in order to reduce the temperature effect to frequency.

2.To inserting caustic and can the influence of effect

• Conductivity and loss: The electric function of electrode material affects signal to transmit medium ohmic loss directly. For example, the conductivity excel Al of Au, Ag, Cu, use tall conductor to be able to reduce electrode resistance, decrease insert caustic (signal attenuation) , those who promote filter can effect. But tall conductor (be like Au) cost is higher, need to be balanced between function and cost.
• Electrode ply and sound wave attenuation: Electrode ply needs to match with sound wave wavelengh (the 1%~5% that is wavelengh normally) , if material choice is undeserved (be like heavy panel or too thin) , the likelihood brings about sound wave to energy is absorbed by electrode or be reflexed excessive, increase insert caustic, the signal that drops filter transmits efficiency.

3.To the influence of power capacity and dependability

• Power is able to bear or endure get ability: Setting applies in high power (if communication radical stands) , of electrode material fight electromigration ability and hear resistance crucial. For example, pure Al electrode produces electromigration easily below high power (the metal is ionic because voltaic action is migratory,bring about electrode invalidation) , and the Al-Cu alloy that adds Cu can promote significantly fight electromigration ability, prolong life of parts of an apparatus. Zhuo Shengwei MAX-SAW is like market of the high end in facing, electrode material may employ this kind of alloy in order to enhance power dependability.
• Corrosion resistance and stability: Electrode material needs to be able to bear or endure the environment such as wet, oxidation affects be affected with damp be affected with damp. For example, cu easy oxidation, the likelihood brings about electrode resistor to increase; And the precious metal such as Au, Pt fights oxidisability strong, but cost is high. The likelihood in applying actually is used multilayer structure (like Cr/Al/Cu cascade) , conductivity of give attention to two or morethings, adherent force and corrosion resistance.

4.To the influence of craft and cost

• Machine difficulty: The photoetching of different electrode material, splash shoot or compatibility of evaporate plating craft is different. For example, al is machined easily, suit massive amount to produce; And of Au splash shoot craft more complex, the likelihood raises manufacturing cost. Zhuo Shengwei builds quantity yield a line to produce MAX-SAW oneself, the choice of electrode material needs comfortable match its craft capacity, in order to make sure the quantity produces efficiency and fine rate.
• Cost control: Precious metal (be like Au) cost outclass Al, Cu, use low cost data (like Al-Cu alloy) can reduce cost of parts of an apparatus, promote the market competition ability. This and Zhuo Shengwei MAX-SAW are in homebred the fixed position photograph that sexual price emphasizes comparing in replacing agrees.

Electrode material is one of core factors that affect performance of filter of Zhuo Shengwei MAX-SAW, its choose to need to be in frequency stability, insert capacity of caustic, power, dependability, craft comfortable match undertake be optimizinged integratedly between gender and cost. The function characteristic that combines MAX-SAW (be like Sub-3GHz frequency paragraph stability of the target that nears BAW, temperature is better) , figure its electrode material may be usedAl-Cu alloy or multilayer metallic structure, match a gender in order to balance conductivity, heat, fight electromigration ability and cost, support its market competition ability thereby.