A miniaturized wideband complementary LTCC diplexer based on transmission lines and lumped elements

2009 ◽  
Author(s):  
Yong-Sheng Dai ◽  
Sheng-Lei Xiao ◽  
Zhong-Hua Ye ◽  
De-Long Lu ◽  
Wen-Kan Zhou ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Lumped Elements

Transmission Line

2020 ◽  
pp. 43-71
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Magnetic Energy ◽  
Propagation Constant ◽  
Characteristic Impedance ◽  
Electric Energy ◽  
Electromagnetic Energy ◽  
The Other ◽  
Electrical Characteristics ◽  
Lumped Elements

A transmission line (TL) is simply a medium that is capable of guiding or propagating electromagnetic energy. The transmission line stores the electric (E) and magnetic (M) energies and distributes them in space by alternating them between the two forms. This means that at any point along a TL, energy is stored in a mixture of E and M forms and, for an alternating signal at any point on the TL, converted from one form to the other as time progresses. Transmission line is usually modelled using lumped elements (i.e., inductors for magnetic energy, capacitors for electric energy, and resistors for modelling losses). The electrical characteristics of a TL such as the propagation constant, the attenuation constant, the characteristic impedance, and the distributed circuit parameters can only be determined from the knowledge of the fields surrounding the transmission line. This chapter gives a brief overview of various transmission lines, with more detailed discussions on the microstrip and the SIW.

Corona Discharge Model for Transmission Lines by Lumped Elements

2011 ◽  
Vol 9 (1) ◽  
pp. 804-809
Author(s):  
Eduardo Coelho Marques Costa ◽  
Sergio Kurokawa ◽  
Jose Pissolato
Keyword(s):  
Corona Discharge ◽  
Transmission Lines ◽  
Lumped Elements ◽  
Discharge Model

scholarly journals A trade-off design of microstrip broadband power amplifier for UHF applications

2020 ◽  
Vol 10 (1) ◽  
pp. 919
Author(s):  
Mohamed Ribate ◽  
Rachid Mandry ◽  
Jamal Zbitou ◽  
Larbi El Abdellaoui ◽  
Ahmed Errkik ◽  
...  
Keyword(s):  
Power Amplifier ◽  
Transmission Lines ◽  
Impedance Matching ◽  
Wave Impedance ◽  
Large Signal ◽  
Active Device ◽  
Quarter Wave ◽  
Lumped Elements ◽  
Signal Simulation ◽  
Matching Techniques

In this paper, the design of a Broadband Power Amplifier for UHF applications is presented. The proposed BPA is based on ATF13876 Agilent active device. The biasing and matching networks both are implemented by using microstrip transmission lines. The input and output matching circuits are designed by combining two broadband matching techniques: a binomial multi-section quarter wave impedance transformer and an approximate transformation of previously designed lumped elements. The proposed BPA shows excellent performances in terms of impedance matching, power gain and unconditionally stability over the operating bandwidth ranging from 1.2 GHz to 3.3 GHz. At 2.2 GHz, the large signal simulation shows a saturated output power of 18.875 dBm with an output 1-dB compression point of 6.5 dBm of input level and a maximum PAE of 36.26%.

Single-layer fully-planar extended-composite right-/left-handed transmission lines based on substrate integrated waveguides for dual-band and quad-band applications

2013 ◽  
Vol 5 (3) ◽  
pp. 213-220 ◽  
Author(s):  
Miguel Durán-Sindreu ◽  
Jordi Bonache ◽  
Ferran Martín ◽  
Tatsuo Itoh
Keyword(s):  
Equivalent Circuit ◽  
Transmission Lines ◽  
Metal Layer ◽  
Equivalent Circuit Model ◽  
Single Layer ◽  
Dual Band ◽  
Lumped Element ◽  
Left Handed ◽  
Lumped Elements ◽  
Band Pass

The implementation and application of single-layer fully-planar extended-composite right-/left-handed transmission lines (E-CRLH TLs) in substrate-integrated waveguide (SIW) technology are presented. The multiband CRLH behavior of these artificial lines is explained by considering the lumped element equivalent circuit model. The potential of these lines for dual-band and quad-band applications is demonstrated by designing and fabricating a quad-band Y-junction power divider and two dual-band band-pass filters. The main relevant advantage of SIW-based E-CRLH TLs over other E-CRLH lines is fabrication simplicity, since only a single metal layer must be etched and lumped elements are avoided. The fabricated prototypes exhibit very reasonable performance. It is remarkable that for dual-band band-pass filters, standard Chebyshev responses can be obtained to a very good approximation.

scholarly journals Novel Wilkinson Power Divider with an Isolation Resistor on a Defected Ground Structure with Improved Isolation

2021 ◽  
Vol 11 (9) ◽  
pp. 4148
Author(s):  
Maaz Salman ◽  
Youna Jang ◽  
Jongsik Lim ◽  
Dal Ahn ◽  
Sang-Min Han
Keyword(s):  
Equivalent Circuit ◽  
Transmission Lines ◽  
Ground Plane ◽  
Three Dimensional ◽  
Matching Theory ◽  
Power Divider ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Lumped Elements ◽  
Wilkinson Power Divider

A modified Wilkinson Power Divider is proposed in this paper that utilizes defected ground structure (DGS) in parallel with an isolation resistor. The proposed DGS section is incorporated between the output ports, and the isolation resistor is soldered in parallel with the DGS in the ground plane, instead of on the top plane as in a conventional Wilkinson power divider, to achieve improved or preferable isolation. The proposed design is comprised of two pairs of microstrip transmission lines with equal impedances and varied electrical lengths. The parameters of the main circuit and the DGS section are acquired separately. The parameters of the proposed main circuit are derived by applying conjugate matching theory. Dumbbell-shaped DGS is introduced in the ground plane between the output ports, which acts as a parallel resonator, yielding an attenuation pole at the resonant frequency that contributes to improved isolation. By applying the previous well-known circuit theory, the lumped elements of the equivalent circuit of the DGS were achieved. The physical dimensions of the equivalent circuit for the DGS section were obtained by three-dimensional EM simulation. The measured results show improved isolation, return loss and better bandwidth as compared with other similar works. Furthermore, the proposed circuits designed at resonating frequencies of 3 and 2 GHz presented comparatively good return losses, S11 of about −25.54 and −31.24 dB, respectively, and achieved improved isolations, S32 between the output ports, in an order of about −40.83 and −36.05 dB, respectively, which is rather exceptional and desirable.

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