Antenna e LNA

Discussion in 'Programmer's Corner' started by tommasokk, Oct 24, 2006.

  1. tommasokk

    Thread Starter New Member

    Oct 24, 2006
    I need an help:
    I have to simulate in Orcad a circuit that modellate a front end of a gps receiver.
    How I can simulate a Patch antenna(or an Antenna in general), that receives a signal of a central frequency of 1,5 GHz and Bandwidth of 20 MHz?
    (I know that at 1,5 GHz this antenna has an output impedence of 50 Ohm)
    (Someone suggest me tu use a generator sinusoidal and a L C R circuit, but I don't know in which mode... what is your thinking?)
    And What is the amplifier (the name) in Pspice Library that I can use as LNA?
    Thank You to everybody.
  2. Papabravo


    Feb 24, 2006
    Can't help with the antenna modeling. LNA is probably not a single component but a complete Low Noise Amplifier built from a collection of components including at least one RF transistor. Although SPICE does not have an upper frequency limit I would be suspicious of any results that you get from that simulator having anything to do with RF unless you have some independent verification.

    EZNEC is a public domain freeware program that may help with antenna modeling. The passive "patch" can be modeled as a grid of intersecting elements.