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## Impedance Characteristic |

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349 Threads found on edaboard.com: **Impedance Characteristic**

I would guess the transmission line Z is around 70ohm like other 1/4 wavelength dipole antennas.
According to literature, it's more complicated. As a simplified idea, imagine that the **characteristic** feed line **impedance** loaded by the dipole elements equals the antenna input **impedance**. So it's always higher than the antenna input impe

RF, Microwave, Antennas and Optics :: 03-07-2017 07:47 :: FvM :: Replies: **2** :: Views: **527**

The assumed first order gain **characteristic** isn't bad as an estimation. There's an additional cascode stage pole, but you can probably ignore it.
The other expressions are however only right if C2 >> Cf, otherwise the amplifier output **impedance** matters.
As a short cut, it's rather unlikely to drive an amplifier with a single gm stage into i

Analog Circuit Design :: 03-01-2017 19:09 :: FvM :: Replies: **50** :: Views: **3249**

Do you have access to software such as HFSS? I know in HFSS in particular, you can place a waveport over your TL and it will solve for the modal **impedance**(s). There are probably several other numerical solvers to achieve the same results.

RF, Microwave, Antennas and Optics :: 02-22-2017 15:26 :: PlanarMetamaterials :: Replies: **1** :: Views: **790**

Yes, a calibration set is referenced to a real Z0 and calibrates the measurement setup to give results referring to this real Z0, although the used cables are lossy and have slightly different (e.g. complex) **impedance**.
Real calibration sets can have deviations from ideal Z0 or need a small amount of port extension. If so, correction data may me

RF, Microwave, Antennas and Optics :: 02-07-2017 14:04 :: FvM :: Replies: **4** :: Views: **542**

Scattering parameters once a TRL calibration is performed are referred to the Zc of the micro-strip line.
Determining with measurement Zc (that is not an outcome of the calibration process) is a problem ( myabe a next question to ask about).
However from the theory we know that Zc is in general complex.
Let say nearly real, but with a small imag

RF, Microwave, Antennas and Optics :: 02-07-2017 12:19 :: aleberto :: Replies: **0** :: Views: **2**

Elementary Electronic Questions :: 12-30-2016 09:43 :: FvM :: Replies: **3** :: Views: **554**

Coaxial cable **characteristic** **impedance** isn't a resistance and can't be only measured with special instruments. To distinguish between 50 and 75 ohm cables, look at the ratio of center conductor to dielectric diameter. It's around 3 for 50 ohms versus 6 for 75 ohms.

Elementary Electronic Questions :: 12-30-2016 08:59 :: FvM :: Replies: **4** :: Views: **808**

An equivalent-circuit model for the patch antenna can be found in Balanis' "Antenna Theory: Analysis and Design" textbook, and probably elsewhere on the internet.
Basically, you want to create a lossy, half-wavelength resonator, the **characteristic** **impedance** of which differs significantly from your system **impedance**.

Electromagnetic Design and Simulation :: 11-29-2016 15:52 :: PlanarMetamaterials :: Replies: **1** :: Views: **766**

I would think that multimode soutions, like waveguides at higher frequency than the fundamental band, would show up as imaginary **impedance**s. the idea that energy can be temporarily stored in these evanescent modes, just like in a capacitor at low frequency, but it is not dissipated there, and eventually returns to the fundamental mode.

RF, Microwave, Antennas and Optics :: 11-25-2016 12:45 :: biff44 :: Replies: **4** :: Views: **1461**

Differential Transmission Lines have 2 **impedance**s.Even mode and odd mode.The **characteristic** **impedance** of a differential lines is composed of these two mode dependent **characteristic** **impedance**s.For more information, "RF and Microwave Coupled-Line Circuits", Inder Bahl, Prakash Bhartia,Rajesh Mongia.
Artech House

RF, Microwave, Antennas and Optics :: 11-24-2016 16:55 :: BigBoss :: Replies: **5** :: Views: **1237**

When I cut and solder one of the 8 wires
What does "cut and solder exactly mean"? The ethernet cable is made of shielded twisted pairs, differential transmission lines with defined **characteristic** **impedance**. For HDMI speed, the pairs must not be untwisted or unshielded for more than one or two centimeter length. Also the length of a

Hobby Circuits and Small Projects Problems :: 11-23-2016 07:29 :: FvM :: Replies: **8** :: Views: **1177**

The line **impedance** (**characteristic** **impedance**) of a uniform transmission line, is the ratio of the amplitudes of a single pair of voltage and current waves propagating along the line in the absence of reflections.
The wave **impedance** of an electromagnetic wave is the ratio of the transverse components of the electric and (...)

RF, Microwave, Antennas and Optics :: 11-24-2016 08:21 :: anilkrpandey :: Replies: **2** :: Views: **864**

The input **impedance** of transmission line is given by Zo*(1 + Γ*exp(-2*γ*l))/(1 - Γ*exp(-2*γ*l)). Where Γ is the reflection coefficient at the load end, l is the length of the line and γ is the propagation constant. For short circuit Γ is -1 and open cicuit Γ is 1. Thus geometric mean of sqrt(Zshort*Zopen) is

RF, Microwave, Antennas and Optics :: 10-28-2016 12:39 :: deba_fire :: Replies: **9** :: Views: **1054**

Hi,
look for a high speed data connector with the same **characteristic** **impedance** like the LVDS signals.
BTW: asking for "the best" isnīt a good idea. For one the best is the cheapest, for the other it is the smallest, for the other it is a water proof one, and so on.
What is the best colour?
Klaus

Professional Hardware and Electronics Design :: 10-24-2016 15:39 :: KlausST :: Replies: **2** :: Views: **666**

Microwave engineering is its own field of study. Various PCB features can act as resonators and/or antennas, the choice of dielectric itself can have a large impact on performance, and **characteristic** **impedance** becomes a critical concept.
So long as you can keep all of your trace lengths electrically short (smaller than one fifth of a wavelength),

RF, Microwave, Antennas and Optics :: 10-13-2016 14:20 :: PlanarMetamaterials :: Replies: **2** :: Views: **611**

I am only confused by the Altium claims that the **characteristic** **impedance** of the diff pair can be maintained in the necked down area
As far as I see in their docs, Altium allows defining different rules for the pair nets so that you can route under the BGA room without being impeded to to that due to violate spe

PCB Routing Schematic Layout software and Simulation :: 10-03-2016 18:49 :: andre_teprom :: Replies: **5** :: Views: **1047**

A clamp is a shunt operation so it depends on source **impedance** and load.(100R)
You are expecting something else?
where did this come from?

Analog Circuit Design :: 08-25-2016 16:29 :: SunnySkyguy :: Replies: **8** :: Views: **943**

Is the load on the CPW equal to its **characteristic** **impedance**?

RF, Microwave, Antennas and Optics :: 08-23-2016 11:10 :: edf :: Replies: **4** :: Views: **584**

I am sure you are confusing **characteristic** **impedance** with the **characteristic** **impedance** of free space which is constant and is 50 Ohms
Surely you mean the **impedance** of free space, that is ≈377 Ω (not 50 Ω).
I don't think this is the confusion of the OP.
There are two th

Electromagnetic Design and Simulation :: 07-07-2016 10:30 :: zorro :: Replies: **4** :: Views: **613**

Hi
We know that the **characteristic** **impedance** of a microstrip line is given as follows:
130174
In general the metal resistivity is so small that Z0 can be taken as sqrt(L/C). But if the metal resisitivity is not that small? Then according to the equation, this resistivity should affect the Z0. Is it true?
I did si

RF, Microwave, Antennas and Optics :: 06-25-2016 12:08 :: carbon9 :: Replies: **3** :: Views: **752**

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