As a
varactor diode we selected an Infineon BB833 in SOD323 package, designed to operate up to 2.5 GHz [31].
Dual C-and S-Band CMOS VCO using the Shunt
varactor switch, Very Large Scale Integration (VLSI) Systems, IEEE Transactions 23(9): 1808-1813.
The particular tunnel diode device, with which these results were obtained, was a GE 1N3713 device operated around an optimal bias point of 139 mV [+ or -] 7 mV, in conjunction with two parallel SMV1405
varactor diodes.
The dipoles are loaded with low-cost silicon
varactor diodes from Skyworks SMV1247-079LF.
(3)
Varactor: An element whose capacitance changes in response to an applied voltage.
The
varactors are grounded via hole by drilling the microstrip substrate and the connections are made from
varactors to the ground plane using bond wires.
Varactor diodes are mounted between the HIS patches in order to obtain the tuning in the patch antenna.
In this paper, the loaded HDGS/EDMS
varactor diode is introduced to realize the tunable dual-stop-band filter.
The unit cell is enclosed by red dashed lines, which includes the type TDK EL0405 inductors [L.sub.g], [L.sub.d]; TDK FK24C0G1 capacitors [C.sub.gd], [C.sub.gs]; Toshiba 1SV101
varactor; and Toshiba 2SK30A JFET.
Steer, "An electronically tunable microstrip bandpass filter using thin-film barium strontium titanate (BST)
varactors," IEEE Trans.
The PPL NLTL consists of a transmission line periodically loaded by several
varactors. Because the
varactor capacitance is much larger at low reverse-bias levels than at higher levels, a positive-going pulse entering the line exhibits a voltage-dependent propagation velocity at successive points in time along the rising and falling edges.