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An electrically tunable microstrip phase shifter for applications of phased array antennas is designed based on nematic liquid crystal material. The experimental results show a tunable differential phase shift up to 270 at 10 GHz, and the insertion loss is less than 9 dB at 1–10 GHz range. By optimizing both of the liquid crystal tuning efficiency and overall loss, an average figure-of-merit (FoM)...
In this paper, a microstrip patch is extended to form planar crossover by suitably choosing the feed locations for orthogonal polarizations. The overlap is modified as a hexagonal patch which offers an isolation of −35 dB at 2.4 GHz. Crossover is a part of butler matrix, which is finds applications in beamforming networks. The proposed crossover is compared for reflection and transmission characteristics...
This paper reports the design of 50–60 GHz probe type waveguide to microstrip transition on LTCC substrate, which acts as an initial development towards integrated MMIC hermetic packaging in millimeter-wave systems. The transition shows a simulated return loss better than 15 dB and insertion loss less than 0.4 dB in back to back configuration. The measured insertion loss is 1.2 to 1.8 dB with return...
This paper reports a level-based circuit topology as a frequency deviation detector front-end circuit for micromachined resonant sensors. Circuit-level compensation of temperature-induced variations in the frequency output is addressed. The power consumption of the implemented CMOS circuit is approximately 480nW. This low power low phase-error front-end interface is beneficial in applications such...
The aim of this paper is to propose characterization of a compact microstrip bandpass filter (BPF) design for fifth generation (5G) wireless communication applications concerning the design frequency of 15 GHz. The BPF design consists of quarter wave parallel-coupled line resonators and additional small resonator attached between the first/last coupled-line section and the ports' 50 ohm transmission...
A wideband substrate integrated waveguide (SIW) power divider is proposed in this paper using the single-layer printed circuit board (PCB) process. The compact transition circuit between the microstrip line and the half-mode SIW (HSIW) lines in the proposed design can function not only as a transition but also as a power divider. A good impedance matching performance can be achieved due to the similar...
In this paper, two bandpass power dividers (BPD), one using conventional quarter-mode substrate integrated waveguide (QMSIW) and the other using both QMSIW and defected ground structure (DGS), are presented. Compared with conventional substrate integrated waveguide (SIW) circuitry, QMSIW can contribute to a size reduction of nearly 75%. And DGS-loaded QMSIW can further improve the size miniaturization...
This paper discusses an edge coupled microstrip filter centered at 1 GHz having 200 MHz bandwidth. The dielectric material used for the fabrication of the filter is FR4.It is having dielectric constant εr of 4.4.The CST software is used for simulation of designed microstrip bandpass filter. The insertion loss acquired is above −2dB and return loss acquired is below 15 dB. The results which is received...
This paper presents a microwave stripline-to-stripline vertical interconnect in Low Temperature Co-fired Ceramic (LTCC) Technology. Two circular grooves are separately designed in the stripline lower ground plane and the stripline upper ground plane to reduce the insertion loss and improve the return loss. The mentioned structure has been simulated by HFSS. According to the simulation comparison results,...
In this paper, the interconnect performance of closely spaced microstrip lines with embedded patterned layers (EPL) are presented. The EPL is an added patterned layer of printed sub wavelength elements that is placed between the ground and signal layers of the microstrip. A comparison of the performance of the microstrips with various EPL geometries is conducted. A study of the pattern density and...
A compact planar configuration is presented for an ultra-wideband (UWB) transition between a microstrip line and a coplanar strip line (CPS). A single metallic via and a slot in the ground plane of a microstrip line are used to transform the microstrip mode into the CPS mode. Three prototype back-to-back transitions are fabricated on a 0.813 mm thick RO4003 substrate. The measured insertion losses...
In this paper, a millimeter-wave transition from waveguide to microstrip is proposed. A rectangular patch element in the short-terminated waveguide is analyzed by the FEM software. The analysis points out that the rectangular patch has optimum sizes which can broad the pass-band of this structure. a prototype transition exhibits an insertion loss of 0.5 dB from 34Ghz to 36GHz, and a bandwidth of 7%...
A new vertical transition is presented that enables the use of epoxy-resin (FR-4) substrates for multi-chip modules (MCM) at millimeter-wave frequencies. A short microstrip trace on an FR-4 motherboard is connected to standard WR-10 waveguide for integration with other system components (e.g. antennas). The microwave transition is accomplished within a small (3 mm by 4 mm) three metal layer miniature...
This paper describes a new broadband microstrip to coplanar strip (CPS) line transition, where supporting substrates are joined perpendicularly, one containing the CPS line and the other one the microstrip line. The CPS line is coupled to the microstrip line through a symmetric slot radial stub placed in the ground plane of the microstrip line substrate. A measured return loss greater than 10dB is...
Gold-bonding wires have been frequently used in connecting semiconductor devices and microstrip lines. This paper presents a design of transition between microstrip line and semiconductor device with gold-bonding wire. As the material and shape of the loop has already been discussed in other researches, this paper concentrates on the positions of the solders and the height of the chip. The results...
We designed and fabricated low-loss and compact microstrip line and Marchand balun composed of thick Cu and thick resin on Si substrate for millimeter-wave applications. An attenuation constant α and Q of the fabricated microstrip line are 0.17 dB/mm and 52 at 60GHz, respectively. The insertion loss and the core size of the fabricated balun are 0.6 dB at 60 GHz and 300 µm × 450 µm, respectively, which...
A low cost 4 ports microstrip line phase shifter is proposed. It is composed of the fixed substrate and the movable substrate. The simulation results show that it can realize equal variety of phase difference between nearby ports by moving the movable substrate, and the maximum phase difference ±215 degrees can be achieved at 2 GHz with the maximum deviation to the ideal line only 8°. The differences...
In this paper, Modified-T equivalent circuit is used to replace long microstrip line to reduce area impact of Package or Printed Circuit Board. Conventional RLCG model of transmission line has been instead of Modified T equivalent circuit, which contains two series inductors, mutual inductor and grounded capacitors to perform the broadband electrical characteristic of long microstrip line. The elements...
An out-of-phase broad-band substrate-integrated waveguide power divider is proposed. The divider uses a folded substrate-integrated waveguide to split an input signal into a pair of half-mode substrate-integrated waveguides. Due to the field distribution in the folded substrate-integrated waveguide, this power split is out-of-phase. Broadband performance is achieved due to the similar field distributions...
In this paper a magnetically tunable filter based on unilateral finlines is presented. The filter covers a tuning frequency range from 72 GHz to 95 GHz, achieving an insertion loss between 11.3 dB and 7.3 dB. In order to be able to adjust such high resonant frequencies, resonators made of hexaferrite material are used. Although the filter contains only two resonators, an off-resonance isolation of...
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