mwavepy.media.media | index /home/alex/docs/python/path/mwavepy/media/media.py

`Contains Media class.`

Modules
`` |  |
mwavepy.mathFunctions numpy | scipy.stats mwavepy.tlineFunctions | warnings |

Classes
`` |  | __builtin__.object Media
class Media(__builtin__.object)
`` | `The super-class for all transmission line media. It provides methods to produce generic network components for any transmision line medium, such as line, delay_short, etc. Network Components specific to an instance of the Media super-class such as cpw_short, microstrip_bend, are implemented within the Media instances themselves.`
| Methods defined here: __init__(self, frequency, propagation_constant, characteristic_impedance, z0=None) `The Media initializer. This initializer has flexible argument types, which deserves some explaination. 'propagation_constant', 'characterisitc_impedance' and 'z0' can all be either static or dynamic. This is achieved by allowing all those arguments to be either; functions which take no arguments or values (numbers or arrays) in the case where the media's propagation constant may change after initialization, because you adjusted a parameter, then passing the propagation_constant as a function can allow for the properties in this Class to reflect that change. takes: frequency: mwavepy.Frequency object propagation_constant*: propagation constant for the medium. characteristic_impedance: characteristic impedance of transmission line medium. z0**: characteristic impedance for media , IF its different from the characterisitc impedance of the transmission line medium (None) [a number]. if z0= None then will set to characterisitc_impedance returns: mwavepy.Media Object *note: propagation_constant must adhere to the following convention, positive real(gamma) = attenuation positive imag(gamma) = forward propagation **note: waveguide is an example where you may need this, because a characteristic impedance is variable but the touchstone's from most VNA's have z0=1` capacitor(self, C, **kwargs) `A lumped capacitor takes: C: capacitance, in Farads, [number] returns: mwavepy.Network` delay_load(self, Gamma0, d, unit='m', **kwargs) `creates a Network for a delayed load transmission line takes: Gamma0: reflection coefficient of load (not in dB) d: the length (see unit argument) [number] unit: string specifying the units of d. possible options are 'm': meters, physical length in meters (default) 'deg':degrees, electrical length in degrees 'rad':radians, electrical length in radians **kwargs: key word arguments passed to match(), which is called initially to create a 'blank' network. the kwarg 'z0' can be used to create a line of a given impedance returns: a 1-port Network class, representing a loaded transmission line of length d note: this just calls, line(d,**kwargs) ** load(Gamma0, **kwargs)` delay_open(self, d, unit='m', **kwargs) `creates a Network for a delayed open transmission line takes: d: the length (see unit argument) [number] unit: string specifying the units of d. possible options are 'm': meters, physical length in meters (default) 'deg':degrees, electrical length in degrees 'rad':radians, electrical length in radians **kwargs: key word arguments passed to match(), which is called initially to create a 'blank' network. the kwarg 'z0' can be used to create a line of a given impedance returns: a 1-port Network class, representing a shorted transmission line of length d note: this just calls, line(d,**kwargs) ** open(**kwargs)` delay_short(self, d, unit='m', **kwargs) `creates a Network for a delayed short transmission line takes: d: the length (see unit argument) [number] unit: string specifying the units of d. possible options are 'm': meters, physical length in meters (default) 'deg':degrees, electrical length in degrees 'rad':radians, electrical length in radians **kwargs: key word arguments passed to match(), which is called initially to create a 'blank' network. the kwarg 'z0' can be used to create a line of a given impedance returns: a 1-port Network class, representing a shorted transmission line of length d note: this just calls, line(d,**kwargs) ** short(**kwargs)` electrical_length(self, d, deg=False) `calculates the electrical length for a given distance, at the center frequency. takes: d: distance, in meters deg: is d in deg?[Boolean] returns: theta: electrical length in radians or degrees, depending on value of deg.` guess_length_of_delay_short(self, aNtwk) `guess length of physical length of a Delay Short given by aNtwk takes: aNtwk: a mwavepy.ntwk type . (note: if this is a measurment it needs to be normalized to the reference plane) tline: transmission line class of the medium. needed for the calculation of propagation constant` impedance_mismatch(self, z1, z2, **kwargs) `returns a two-port network for a impedance mis-match takes: z1: complex impedance of port 1 [ number, list, or 1D ndarray] z2: complex impedance of port 2 [ number, list, or 1D ndarray] **kwargs: passed to mwavepy.Network constructor returns: a 2-port network [mwavepy.Network] note: if z1 and z2 are arrays or lists, they must be of same length as the self.frequency.npoints` inductor(self, L, **kwargs) `A lumped inductor takes: L: inductance in Henrys [number] returns: mwavepy.Network` line(self, d, unit='m', **kwargs) `creates a Network for a section of matched transmission line takes: d: the length (see unit argument) [number] unit: string specifying the units of d. possible options are 'm': meters, physical length in meters (default) 'deg':degrees, electrical length in degrees 'rad':radians, electrical length in radians **kwargs: key word arguments passed to match(), which is called initially to create a 'blank' network. the kwarg 'z0' can be used to create a line of a given impedance returns: a 2-port Network class, representing a transmission line of length d example: my_media = mwavepy.Freespace(...) my_media.line(90, 'deg', z0=50)` load(self, Gamma0, nports=1, **kwargs) `creates a Network for a Load termianting a transmission line takes: Gamma0: reflection coefficient of load (not in db) nports: number of ports. creates a short on all ports, default is 1 [int] **kwargs: key word arguments passed to match(), which is called initially to create a 'blank' network returns: a n-port Network class, where S = Gamma0*eye(...)` match(self, nports=1, z0=None, **kwargs) `creates a Network for a perfect matched transmission line (Gamma0=0) takes: nports: number of ports [int] z0: characterisitc impedance [number of array]. defaults is None, in which case the Media's z0 is used. Otherwise this sets the resultant network's z0. See Network.z0 property for more info **kwargs: key word arguments passed to Network Constructor returns: a n-port Network [mwavepy.Network] example: mymatch = wb.match(2,z0 = 50, name='Super Awesome Match')` open(self, nports=1, **kwargs) `creates a Network for a 'open' transmission line (Gamma0=1) takes: nports: number of ports. creates a short on all ports, default is 1 [int] **kwargs: key word arguments passed to match(), which is called initially to create a 'blank' network returns: a n-port Network [mwavepy.Network]` short(self, nports=1, **kwargs) `creates a Network for a short transmission line (Gamma0=-1) takes: nports: number of ports. creates a short on all ports, default is 1 [int] **kwargs: key word arguments passed to match(), which is called initially to create a 'blank' network returns: a n-port Network [mwavepy.Network]` shunt(self, ntwk, **kwargs) `returns a shunted ntwk. this creates a 'tee', connects 'ntwk' to port 1, and returns the result takes: ntwk: the network to be shunted. [mwavepy.Network] **kwargs: passed to the tee() function returns: a 2-port network [mwavepy.Network]` shunt_capacitor(self, C, *args, **kwargs) `a shunt capacitor takes: C: capacitance in farads *args: passed to self.capacitor **kwargs:passed to self.capacitor returns: a 2-port mwavepy.Network` shunt_delay_load(self, *args, **kwargs) `a shunted delayed load: takes: *args: passed to self.delay_load **kwargs:passed to self.delay_load returns: a 2-port network [mwavepy.Network]` shunt_delay_open(self, *args, **kwargs) `a shunted delayed open: takes: *args: passed to self.delay_load **kwargs:passed to self.delay_load returns: a 2-port network [mwavepy.Network]` shunt_delay_short(self, *args, **kwargs) `a shunted delayed short: takes: *args: passed to self.delay_load **kwargs:passed to self.delay_load returns: a 2-port network [mwavepy.Network]` shunt_inductor(self, L, *args, **kwargs) `a shunt inductor takes: L: inductance in henrys *args: passed to self.inductor **kwargs:passed to self.inductor returns: a 2-port mwavepy.Network` splitter(self, nports, **kwargs) `returns an ideal, lossless n-way splitter. takes: nports: number of ports [int] **kwargs: key word arguments passed to match(), which is called initially to create a 'blank' network. returns: a n-port Network [mwavepy.Network]` tee(self, **kwargs) `makes a ideal, lossless tee. (aka three port splitter) takes: **kwargs: key word arguments passed to match(), which is called initially to create a 'blank' network. returns: a 3-port Network [mwavepy.Network] note: this just calls splitter(3)` theta_2_d(self, theta, deg=True) `converts electrical length to physical distance. The electrical length is given at center frequency of self.frequency takes: theta: electrical length, at band center (see deg for unit) [number] deg: is theta in degrees? [boolean] returns: d: physical distance in meters` thru(self, **kwargs) `creates a Network for a thru takes: **kwargs: key word arguments passed to match(), which is called initially to create a 'blank' network returns: a 2-port Network class, representing a thru note: this just calls line(0)` white_gaussian_polar(self, phase_dev, mag_dev, n_ports=1, **kwargs) `creates a complex zero-mean gaussian white-noise signal of given standard deviations for phase and magnitude takes: phase_mag: standard deviation of magnitude phase_dev: standard deviation of phase n_ports: number of ports. defualt to 1 **kwargs: passed to Network() initializer returns: result: Network type` Data descriptors defined here: __dict__ `dictionary for instance variables (if defined)` __weakref__ `list of weak references to the object (if defined)` characteristic_impedance propagation_constant z0