Showing papers by "Jayanta Mukherjee published in 2017"

Multi Mode Resonators Based Triple Band Notch UWB Filter

Abstract: A compact and highly selective triple band notch UWB (3.3 GHz -10.7 GHz) filter is presented. Low insertion loss UWB pass band characteristics is achieved by two coupled multi mode resonators (MMR1 and MMR2). Desired triple band notch characteristics and sharp UWB filter characteristics are achieved by introducing transmission zeroes (TZs). Three band notches are implemented to mitigate the potential interferer signals at 4.42 GHz (Radio altimeter ITU band), 5.54 GHz (WLAN) and 7.64 GHz (Satellite communications). Wide upper stop band is realized by incorporating a stepped impedance low pass filter structure. The filter is realized on a RT/Duroid 5880 substrate ( $\varepsilon _{\mathrm {r}}=2.2$ and thickness = 0.8 mm) and measured to validate the predicted results. The group delay of the filter is relatively constant and less than 0.45 ns over the desired pass band.

A Self-Biased Mixer in $0.18\mu \text{m}$ CMOS for an Ultra-Wideband Receiver

Abstract: A self-biased CMOS analog mixer for ultra-wideband (UWB) applications is presented in this paper. The proposed mixer is complementary and self-biased, and has lower power consumption, superior isolation, and larger bandwidth. The proposed low-power, down conversion mixer is designed and fabricated in UMC $0.18\mu \text{m}$ CMOS technology. The measurement results show that it can operate at UWB frequencies that range from 1 to 6 GHz. The proposed mixer provides a maximum conversion gain of 13 dB, −4.5 dBm of third-order input intercept point, and a minimum double sideband noise figure of 12 dB. The maximum values of the measured local oscillator LO-to-RF, RF-to-IF, and LO-to-IF isolations are 50, 45, and 52 dB, respectively.

Wide band circularly polarised diversity antenna for satellite and mobile communication

Abstract: A wide band circularly polarised diversity antenna consisting of closely spaced monopole radiators is proposed. Two novel, microstrip fed-printed monopoles are designed on a common ground plane. The ground plane which is asymmetric with respect to the feed line along with the planar monopole structure is used to achieve circular polarisation. The monopoles which are symmetric with respect to the vertical axis produce orthogonally polarised waves. A modified split ring resonator-like structure is designed on the ground plane to achieve high port-to-port isolation. The impedance bandwidth (Voltage Standing Wave Ratio 18 dB between the radiating elements is achieved. The proposed antenna provides an axial ratio (AR 70% and gain >2 dBic over the frequency band between 1.73 and 2.63 GHz.

Multiple band notch and Dual-Band filter using concentric and contiguous split ring resonators (CCSRR)

Abstract: A novel, compact, multiple band notch filter and dual-band filters are presented. Contiguous and concentric split ring resonators (SRRs) and Ring resonator are used to achieve desired multiple narr...

A TM 01 to TE 11 mode converter designed with semicircular waveguide sections

Abstract: A novel TM01 to TE11 mode converter with aligned ports, wide bandwidth and high conversion efficiency is proposed Mode conversion is performed with a circular waveguide partitioned into two semicircular sections with different path length Lower semicircular section has a cosine profile to provide a path difference of Ag/2 for the mode conversion Mode converter was designed and simulated at 3GHz operating frequency Electric field calculation shows that the mode converter can handle upto 3 GW high power microwave signal The mode converter was fabricated and the mode conversion was verified experimentally, by measuring farfield radiation pattern of the output mode The proposed mode converter has a symmetric structure and has the advantage of aligned ports and wide bandwidth

Spurious free independently controllable compact quad-band filter using folded T-shaped stub loaded modified ring resonator

Abstract: A compact spurious free, quad-band, band-pass filter (BPF) having independently controllable and widely spaced frequency bands is proposed. The design consists of a basic BPF to which the authors introduce transmission zeros (TZs) in the frequency response using T-shaped stubs loaded with a modified ring resonator (MRR) thereby creating the four passbands. This design results in very high band-to-band isolation. The TZs are obtained by transversal signal path cancellation and also due to the loaded T-shaped stubs. The BPF consists of a stepped impedance low-pass filter which provides spurious free out of band characteristics up to 20 GHz. By changing the tapping position of the MRR, the frequencies of the TZs can be adjusted to get the desired pass band characteristics. The proposed quad-band filter provides low-insertion loss (<1 dB) at the four passbands centred at 2.4, 5.1, 7.7 and 10.1 GHz. The simulation results of the filter are verified experimentally.

A novel beam steering dipole antenna using phase varying metasurface as reflector

Abstract: In this paper a simulation based study of a novel continuously beam steerable antenna is presented using a tunable metasurface as phase varying reflector. The antenna radiation pattern can be changed by changing the state of the diodes loaded in the phase varying reflector. A planar dipole antenna is used to excite the tunable reflector. By this technique the antenna beam can be steered from +300 to -300 in the broadside direction depending on the operating state of the diodes. Moreover, the state of the diodes can be addressed digitally and hence a steep gradient in phase can be achieved in the reflector. The antenna radiation pattern and the gain has been found stable all over its states.

Ultra-compact dual mode dual band filter based on separate electric and magnetic coupling paths

Abstract: A pair of dual mode independent controllable resonators used to realize dual band pass filter with good frequency selectivity and isolation is presented. The resonators are directly connected to input/output and are coupled through electric and magnetic coupling in two different paths. Magnetic coupling between the resonators is achieved using a common grounded via-hole between the two set of quarter-wavelength resonators. Electric coupling is achieved through open edge coupling of the resonators. Two independent resonators with Separate Electric and Magnetic Coupling (SEMC) paths produce an independently controllable dual band filter response and also additional transmission zeros (TZs) at the edges of the pass bands. The TZs are introduced to improve the selectivity of the filter. Filter exhibits desired pass band response at the Universal Mobile Telecommunications System (UMTS) band (1.95-2.2 GHz) and Worldwide Interoperability for Microwave Access (WiMAX) band (3.4-3.6 GHz). Proposed compact filter is implemented on RT/Duroid 5880 (er = 2.2) substrate with thickness of 0.785 mm and surface area of 15 × 12 sq. mm.

Mutual coupling reduction by using tilted variable length srr like structure in uwb mimo antennas

Abstract: In this paper mutual coupling reduction between two elements of ultra-wide band (UWB) MIMO antenna by using a tilted SRR like structure with variable length is proposed. The antenna consists of two modified elliptical shaped monopole antennas designed using 0.787 mm thick RT duroid. Near field distribution of the antenna structure is studied to understand the isolation mechanism. Tilted variable length SRR like structure is used to achieve S 11 and S 21 less than −10 dB and −22 dB respectively over 3.1–10.6 GHz. The proposed structure has a good diversity performance, nearly constant group delay and transfer function variation within 11 dB over UWB.

Broadband spiral diversityantenna with dielectric loading

Abstract: In this paper, dielectric loading and scaling is used to achieve broadband circular polarization with compact size. The spirals are arranged in opposite configuration sense which is used for detection of circularly-polarized waves of either polarization sense. A wide band balun is designed to feed the antenna structure. Antenna is enclosed in elliptical shape housing. A broad impedance and AR bandwidth is obtained.

General synthesis method for negative group delay response: A filter base approach

Abstract: A novel systematic synthesis method for negative group delay(NGD)filter is proposed in this paper. Transfer functions are obtain from synthesized characteristics polynomials. An optimum design condition is derived to reduce the number of resonators being equal to the highest degree of polynomial. Different synthesis examples are discussed with different orders and NGD responses. The exact agreement between the polynomial and coupling matrix based responses illustrate the proposed synthesis method. An experimental design prototype with three half wave length resonators is demonstrated. Prototype filter showed a good agreement between the measured and proposed synthesis method.

Compact TM 01 to TE 11 mode converter designed with matching sections

Abstract: A method for designing compact TM 01 to TE 11 mode converter using dielectric slabs with matched sections is proposed in this letter. The dielectric slabs are fixed in a circular waveguide sectored by thin metallic plate partition. The designs incorporate the quarter wavelength dielectric matching section utilizing two methods i.e. inserting a different dielectric material and horizontal corrugation of existing dielectric material to minimize the length of circular waveguide mode converter. The mode converter is designed to operate at the center frequency of 3 GHz with maximum conversion efficiency of 98.4% and a bandwidth of nearly 12% for both types of matching sections. For practical realization of the concept, Teflon and FR4 are used as dielectric materials. The proposed mode converter is linear, symmetric and easy to fabricate and moreover, a length of 1.7 λ provides the advantage of being light weight and compact.