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The new type of narrowband bandpass filter is presented. The design and realization of the filter in microstrip technology is described. The filter has been etched from YBCO thin film deposited on sapphire substrate. The filter has bandwidth of 0.2 %, RL better than 20 dB and a size of 2 inch in diameter. The structure consists of coupled half-wavelength resonators with additional cross couplings...
In the paper a planar circular model (20-by-20 µm in size) of a band-pass multiplexing filter, based on 2D photonic crystal with original “dewdrop-petal” inner structure has been considered. The frequency selectivity of this filter is due to its geometry, built on the base of nature processing physical system - a flower with dewdrops on its petals. The filter has been PCsimulated on TE electromagnetic...
Recent developments of millimeter-wave CMOS radio frequency integrated circuit (RFIC) attenuators possessing switching and band-pass filtering functions are presented. The attenuators are developed using 0.18-µm SiGe BiCMOS technology. The CMOS dual-function attenuator capable of switching is designed for 4-bit operations and 10–67-GHz bandwidth, which achieves measured attenuation flatness of 2.4–...
Tunability of lumped-element bandpass filters on series LC-tanks with variable capacitors is analyzed. The filters are shown capable to tune continuously the center frequency and bandwidth. Conditions and constraints for keeping absolute bandwidth (ABW) and fractional bandwidth (FBW) constant are presented. Design of a three-pole varactor-tuned bandpass filter that allows a continuous tuning of the...
This paper presents the original synthesis method for band-pass filters, that allowable are arbitral transmission zeros occurring at each side on the pass-band. This method employs const J-inverters and polynomial effective-linearization of band-stop reactances. Proposed synthesis is of course an analytically simply solvable. Attained frequency responses of designed filters give expected sufficient...
A compact slow-wave millimeter-wave bandpass filter for wireless communication systems is developed and proposed in this paper. The filter is based on an open-loop resonator that is composed of a microstrip line with both ends loaded with folded open stubs. The folded arms of the open stubs are utilized to increase the loading capacitance to ground. In addition, the folded arms of the open stubs are...
In this paper, a new design of a traveling wave loop directional filter allowing for realization of transmission zeroes has been proposed. In order to introduce transmission zeroes to bandpass branch of the filter, two loops have been cascaded using transmission line sections. Theoretical analysis of the circuit has been provided giving the insight into behavior of the appearing transmission zeroes...
In this paper the working principle and fundamental properties of frequency multipliers are described. The article presents the frequency tripler solution which generates microwave signal response in the 18 GHz band (K-band). The various stages of the designed tripler for the C-band input signal are introduced. Test results including the third harmonic frequency response of the manufactured tripler...
In order to achieve lightweight yet low cost antennas for use in a geostationary space environment, the GeReLEO-SMART project develops a substrate-based, multilayer antenna structure which can replace traditional horn antennas as feeds for reflector antennas. To verify a design, an example mission is developed, consisting of a 2×2 patch antenna array with an integrated stripline bandpass filter. The...
A compact microstrip bandpass filter with Ultra-wideband passband is presented in this paper. The filter is designed based on a transmission line bandpass filter with three short-circuited stubs separated by two non-redundant unit elements. Each of the uniform non-redundant unit elements is replaced by a lowpass filter to shrink the physical size of the filter and to reject the second unwanted spurious...
Low noise amplifier design for receiver terminal of Ka Band VSAT systems is presented. The design achieves less than 0.95 dB noise figure at 19.7–20.2 GHz, receive band of Ka band satellite communications systems. Typically, low noise block is used for this purpose, however, in this particular VSAT arrangement, reflector antenna is located away from the rotating antenna unit, which is intended for...
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