While designing filter keep bandwith in mind as for low bandwith ,the filter will be difficult to make.

"What are the ways to connect it in the PCB design?"

How should I interpret "it"? The MEMS switch(es)?

One possibility is to have a PCB stack-up with Au over Ni, allowing the switch to be bonded to the PCB. But - depending on the technology of your switch - other techniques may apply.

Regards

Thank you. Well, if you could elaborate a little! I haven't work with MEMs, so trying to know how to use it in PCBs. Usually we use varactor diode to tune a BPF circuit. So trying to use MEMs in place of the diode.

OK. While the varactor diode is an analog component (you can control the actual capacitance by varying the control voltage), a MEMS switch would be a digital component.

• You could e.g. have a capacitor in series with the switch (maybe even on the same die) - adding "a bit of" capacitance when closing the switch. There are "digitally tunable capacitors" available - see e.g. https://www.psemi.com/products/digitally-tunable-capacitors-dtc
• As the MEMS switches are capable to switch comparably large currents, one might even imagine switching (or short-circuiting) coils by these switches.

Does this help somewhat further?

What is the value of central frequency? and required bandwidth.? We were facing lots of problems while designing 170Mhz central frequency and 25 Khz bandwidth in analog filter. At higher frequencies achieving low bandwidth(relative to central frequency) is a problem in practice. Therefore valid questions are 1]what is central frequency ?

2] Bandwidth ?

3] Analog or digital filter ?

so is true for all other techniques as the important work of filter to reduce interference of adjacent channels.

On PCB you can try with the Bias Pad.

n-bit two-state variable capacitor using RF MEMS capacitive

switch with metal-insulator-metal (MIM) capacitors as a fixed capacitors. now n-bit will decide the capacitor value depend upon binary weightage of n bits for tuning . now you decide 5 pole or higher poles depend upon your targeted value of insertion loss. higher pole will incur more insertion loss than 5 pole.

Now to embed these n- bit you require Phase Lock Loop (PLL) circuits which has digital drive for these bits.

Regards.

Center frequency 0.9 GHz. It is a microstrip filter