scholarly journals Compact and Wideband Parallel-Strip 180° Hybrid Coupler with Arbitrary Power Division Ratios

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Leung Chiu ◽  
Quan Xue
Keyword(s):  
Characteristic Impedance ◽  
Impedance Bandwidth ◽  
Strip Line ◽  
Simple Design ◽  
Phase Inverter ◽  
Arbitrary Power ◽  
Absolute Phase ◽  
Parallel Strip ◽  
Hybrid Coupler ◽  
Good Agreement

This paper presents a class of wideband 180° hybrid (rat race) couplers implemented by parallel-strip line. By replacing the 270° arm of a conventional 180° hybrid coupler by a 90° arm with phase inverter, the bandwidth of the coupler is greatly enhanced and the total circuit size is reduced by almost half. Simple design formulas relating the characteristic impedance of the arms and power division ration are derived. To demonstrate the concept, four couplers with different power division ratios of 1, 2, 4, and 8 were designed, fabricated, and tested. S-parameters of the coupler are simulated and measured with good agreement. All working prototypes operate more than 112% impedance bandwidth with more than 25 dB port-to-port isolation and less than 5° absolute phase imbalance. The proposed 180° hybrid couplers can be employed as a wideband in-phase/differential power divider/combiner, which are essential for many RF and microwave subsystem designs.

scholarly journals Wideband Microstrip 90° Hybrid Coupler Using High Pass Network

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Leung Chiu
Keyword(s):  
Transmission Line ◽  
Impedance Bandwidth ◽  
Phase Inverter ◽  
Branch Line ◽  
Quarter Wavelength ◽  
Lumped Elements ◽  
Hybrid Coupler ◽  
High Pass ◽  
Microstrip Circuit

A wideband 90° hybrid coupler has been presented and implemented in planar microstrip circuit. With similar structure of conversional 2-section branch-line coupler, the proposed coupler consists of a lumped high-pass network but not the quarter wavelength transmission at the center. The values of all lumped elements were optimized to replace a quarter-wavelength transmission line with a phase inverter. To demonstrate the proposed concept, a 1-GHz prototype was fabricated and tested. It achieves 90% impedance bandwidth with magnitude of S11 less than −10 dB. Within this bandwidth, more than 13 dB port-to-port isolation, less than 5.0 degree phase imbalance, and less than 4.5 dB magnitude imbalance are achieved, simultaneously. The proposed coupler not only achieves much wider bandwidth but also occupies less circuit area than that of the conversional 2-section branch-line coupler.

scholarly journals A Printed LPDA Antenna Fed by a Microstrip Line to Double Sided Parallel Strip Line from Backside

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Zhou Yang ◽  
Huang Jingjian ◽  
Wu Weiwei ◽  
Yuan Naichang
Keyword(s):  
Radio Frequency ◽  
Microstrip Line ◽  
Rf Circuits ◽  
Strip Line ◽  
Radiation Patterns ◽  
Frequency Range ◽  
Dielectric Substrates ◽  
Feeding Technique ◽  
Parallel Strip ◽  
Good Agreement

A novel planar printed log-periodic dipole array (LPDA) antenna fed by tapered microstrip line (MSL) to double sided parallel strip line (DSPSL) is proposed in this paper. The proposed antenna adopts MSL feeding approach from backside. Using this feeding technique makes the printed LPDA antenna easier to be integrated into radio frequency (RF) circuits. In this paper, four layers are used to construct the antenna. The four layers of the printed LPDA antenna are printed on three thin dielectric substrates which are integrated together. To validate this approach, a printed LPDA antenna is simulated and fabricated for operating in the S and C bands (2.5–6 GHz). The antenna showed a good result over the whole frequency range with 2 : 1 VSWR, an average gain of 6.5 dB, and stable radiation patterns. The measured results are in very good agreement with simulations.

scholarly journals Unlimited Power Division Ratio of Microstrip Balanced-to-Unbalanced Gysel-Type Arbitrary Power Divider

Electronics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 1124
Author(s):  
Zihui Zhu ◽  
Zhongbao Wang ◽  
Ye Fu ◽  
Shaojun Fang ◽  
Hongmei Liu ◽  
...  
Keyword(s):  
Characteristic Impedance ◽  
Power Divider ◽  
Power Dividers ◽  
Arbitrary Power ◽  
Division Ratio ◽  
Mode Suppression ◽  
High Impedance ◽  
Form Design ◽  
The Common ◽  
Good Agreement

A microstrip balanced-to-unbalanced (BTU) Gysel-type arbitrary power divider without the high-impedance transmission-line (TL) section is proposed to eliminate the power division ratio (PDR) limit of the conventional microstrip BTU power dividers. The proposed circuit includes five moderate-impedance TLs having the same characteristic impedance in addition to a grounded resistor. The arbitrary PDR is easily obtained by varying the electrical length of the TLs without changing the characteristic impedances, especially the large PDR, which is difficult to achieve by means of conventional BTU power dividers. When the PDR is ∞, the proposed circuit becomes a balun. The closed-form design equations are derived and discussed. To verify the proposed circuit, three prototypes I, II, and III are designed and fabricated for PDRs of 10 dB, 20 dB, and ∞ dB, respectively. The measured PDRs are in good agreement with the simulations. The measured isolation between the output ports is higher than 31 dB for prototypes I and II. The measured insertion loss of the balun prototype is 0.194 dB. Furthermore, the common-mode suppression of greater than 32 dB and the return loss of higher than 22 dB are obtained for various PDRs.

scholarly journals Design of a Planar Tri-Band Notch UWB Antenna for X-Band, WLAN, and WiMAX

2020 ◽  
Vol 10 (6) ◽  
pp. 6557-6562
Author(s):  
S. Alotaibi ◽  
A. A. Alotaibi
Keyword(s):  
Ground Plane ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Strip Line ◽  
Uwb Antenna ◽  
Notched Band ◽  
X Band ◽  
Measurement Results ◽  
Good Agreement ◽  
Triple Band

In this work, a new ultra-wideband (UWB) antenna design with 2.08GHz to 12GHz impedance bandwidth and triple-band specifications is presented. The proposed antenna is formed by a truncated square patch, a partial ground plane, and a 50Ω microstrip line. Three different types of slots were used in order to induce notched bands. A C-shaped slot is etched on the radiating patch to obtain a notched band in 3.31-4.21GHz for WiMAX. An inverted U-shaped slot in the micro-strip line induces a second notched band in order to reduce the interference with the WLAN [5.04-6.81GHz]. Finally, two inverted L-shaped slots around the micro-ribbon line on the ground plane allow the X-band [9.13 to 10.75GHz]. The antenna has dimensions of 32×28×1.6mm3. The Ansoft software (HFSS) was used to simulate the proposed structure. The simulation results are in good agreement with the measurement results. The antenna shows an omnidirectional radiation pattern.

A bottom-feed omni-directional circularly polarized antenna array

2019 ◽  
Vol 11 (10) ◽  
pp. 1075-1080
Author(s):  
Xi Li ◽  
Lin Yang ◽  
Jia-Wei Zhao ◽  
Yi Liu ◽  
Fang-Zhou Sun
Keyword(s):  
Antenna Array ◽  
Coaxial Cable ◽  
Impedance Bandwidth ◽  
Strip Line ◽  
Horizontal Polarization ◽  
Circularly Polarized ◽  
Directional Radiation ◽  
Half Wavelength ◽  
Parallel Strip ◽  
Strip Lines

AbstractA bottom-feed omni-directional CP (circularly polarized) antenna array is proposed in this letter. The antenna array is composed of four elements (two printed ZPS (zero-phase-shift) line loops and two half-wavelength dipoles). The four elements are fed with the same phase and amplitude. The ZPS line loops provide the horizontal polarization while the dipoles provide the vertical polarization. Therefore, omni-directional circular polarization is formed in the far field. The feeding network consists of a 1–4 T-shaped power divider formed by parallel strip lines. In order to balance the amplitude of the feeding coaxial cable, the structure is used in the bottom to transfer parallel strip line to micro-strip line. Besides, the loops and the dipoles are placed on the different side of the network to guarantee the omni-directional radiation property. The measured impedance bandwidth of the fabricated antenna is 0.13 GHz (2.40–2.53 GHz) and the measured maximum CP gain at 2.45 GHz is 4.8 dBic.

scholarly journals Multi-way differential power divider with microstrip output interfaces

2020 ◽  
Vol 71 (4) ◽  
pp. 274-280
Author(s):  
Cheng-Guang Sun ◽  
Jia-Lin Li ◽  
Baidenger Agyekum Twumasi
Keyword(s):  
Characteristic Impedance ◽  
Theoretical Data ◽  
Power Divider ◽  
Center Frequency ◽  
Impedance Bandwidth ◽  
Power Dividers ◽  
Quarter Wavelength ◽  
Insertion Losses ◽  
Better Than ◽  
Good Agreement

AbstractThe design and implementation of planar multi-way differential power dividers remain a challenge in terms of the compactness and especially, for the achievable characteristic impedance of the quarter-wavelength transformer when considering large number of outputs. In this work, the double-sided parallel stripline is recommended to realize such a power divider with out-of-phase outputs, and explicit design methods are provided. The proposed multi-way power divider was developed without the use of lump elements on a single substrate. For system applications, a prototype operating at 41.6 MHz with 12 pairs of out-of-phase outputs that utilize the microstrip line as the output interfaces was fabricated and examined. At the center frequency of 41.6MHz, the developed prototype measured insertion losses akin to 14.3 dB as compared with the theoretical data of 13.8 dB. The attainable impedance bandwidth ranges from 10 MHz to 80 MHz under a magnitude imbalance of ±0.3 dB. The isolations of the adjacent outputs are about 13.1 dB as compared with the theoretical values of 14.428 dB, and are better than 34 dB for more distant ones. Parameter measurements are in good agreement with the numerical predications, thus demonstrating the realization of the proposed multi-way power divider.

scholarly journals A balanced-to-balanced directional coupler based on branch-slotline coupled structure

Frequenz ◽  
2020 ◽  
Vol 74 (11-12) ◽  
pp. 427-433
Author(s):  
Yaxin Liu ◽  
Feng Wei ◽  
Xiaowei Shi ◽  
Cao Zeng
Keyword(s):  
Directional Coupler ◽  
Return Loss ◽  
Design Method ◽  
Differential Mode ◽  
Arbitrary Power ◽  
Measurement Results ◽  
Transition Structures ◽  
Coupled Structures ◽  
Better Than ◽  
Good Agreement

AbstractIn this paper, a balanced-to-balanced (BTB) branch-slotline directional coupler (DC) is firstly presented, which can realize an arbitrary power division ratios (PDRs). The coupler is composed by microstrip-to-slotline (MS) transition structures and branch-slotline coupled structures. The single-ended to balanced-ended conversion is simplified and easy to implemented by the MS transition structures, which intrinsically leads to the differential-mode (DM) transmission and common-mode (CM) suppression. Moreover, the different PDRs which are controlled by the widths of branch-slotlines can be achieved. In order to verify the feasibility of the proposed design method, two prototype circuits of the proposed coupler with different PDRs are fabricated and measured. The return loss and the isolation of two designs are all better than 10 dB. Moreover, the CM suppressions are greater than 35 dB. A good agreement between the simulation and measurement results is observed.

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