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Learning path 06

Antennas & Propagation

A well-matched port is only the beginning. Follow power into space, find the directions and polarizations that matter, and connect an antenna claim to evidence.

Begin with antenna parameters →Explore the sequence
Sequence
6 modules
Available now
Modules 06.1–06.6
Prerequisites
Paths 01 and 03
Recurring case
2.45 GHz node
The path contract

From the feed to the field.

For RF, product, and system engineers who specify and review antennas. No antenna-synthesis background is required.

Start here

Build a conserving power ledger, interpret patterns, and write an antenna requirement in the first lesson. Its evidence map is a complete local example; no saved progress is needed.

Bring with you

RF Fundamentals, especially power, fields, and noise, plus Transmission Lines & Matching modules 03.2–03.4. RF Systems is useful before the later channel and measurement lessons.

Whole-path learning outcomes
  • Distinguish port, radiation, and receive metrics.
  • Connect antenna families and installation to coverage.
  • Reason about multiple antennas and conditional link distributions.
  • Choose evidence that can test the product claim.
The learning sequence

Six connected decisions.

Modules 06.1–06.6 are available. All six lessons are available; lesson availability is not a certification.

  1. 01

    Antenna Parameters That Describe Different Things

    Separate match, loss, direction, polarization, and receive behavior before choosing evidence.

    90–120 min · estimated
    10 sections
    • Failure: good S11 is reported as a “good antenna”
    • From guided current to radiated fields
    • Build the port-to-space power ledger
    • Radiation efficiency and total efficiency answer different questions
    • Directivity, gain, and realized gain
    • Read patterns, cuts, beams, sidelobes, and nulls
    • Polarization is a vector relationship
    • Effective aperture and reciprocal receive behavior
    • An antenna has several bandwidths
    • Write a complete antenna requirement for the node
    Open module
  2. 02

    Antenna Families & Selection

    Connect the requirement to current paths, volume, ground, and bandwidth.

    90–120 min · estimated
    10 sections
    • Failure: copying a catalogue antenna without its evaluation ground
    • Classify antennas by physical behavior
    • Dipoles, monopoles, and the non-optional counterpoise
    • Loops and slots
    • Patch, PIFA, IFA, and planar product antennas
    • Helical and circular-polarization options
    • Horns, reflectors, arrays, and aperture scaling
    • Electrically small antennas
    • Printed, stamped, ceramic, cable, and external implementations
    • Build the node shortlist and disqualifier matrix
    Open module
  3. 03

    Antennas in Real Products

    Account for enclosure, metal, battery, hand, feed, and installation.

    90–120 min · estimated
    10 sections
    • Failure: the open-board antenna collapses after final assembly
    • The antenna includes the product current distribution
    • Feed placement, reference plane, matching, and return current
    • Balanced antennas on unbalanced lines
    • Batteries, displays, shields, cables, fasteners, and mounting metal
    • Enclosures, adhesives, coatings, tissue/water, and tolerances
    • Clearance, keepout, and coupling to noisy circuits
    • Multiple user/mechanical states need a tuning strategy
    • Coupons, prototypes, simulation correlation, and configuration control
    • Define node integration variants and acceptance evidence
    Open module
  4. 04

    Arrays, Diversity & Beamforming

    Choose what multiple antennas should accomplish and what evidence they need.

    90–120 min · estimated
    10 sections
    • Failure: the second antenna sees the same mode
    • Spatial phase comes from path difference
    • Element pattern times array factor—under assumptions
    • Spacing, steering, beamwidth, and sidelobes
    • Grating lobes, scan range, and beam squint
    • Mutual coupling and embedded element patterns
    • Pattern, polarization, and spatial diversity
    • Selection, MRC, and beamforming families
    • RF-chain coherence and calibration drift
    • Choose the gateway objective and evidence plan
    Open module
  5. 05

    Propagation, Channels & Link Distributions

    Build a conditional link distribution for a named use scenario.

    90–120 min · estimated
    10 sections
    • Failure: free-space path loss becomes a guaranteed range
    • Build the link ledger from transmit plane to receive decision
    • Friis and free-space basic transmission loss
    • Frequency dependence is not one slogan
    • Reflection, diffraction, scattering, penetration, and clutter
    • Two-ray interference creates distance-dependent nulls
    • Path loss is often a distribution
    • Delay, Doppler, and coherence connect channel to waveform
    • Orientation, polarization, body, mounting, and diversity
    • Build three node link distributions
    Open module
  6. 06

    Antenna Measurement & Link Reality

    Reconcile port, chamber, and field evidence with uncertainty.

    90–120 min · estimated
    10 sections
    • Failure: VNA success and chamber failure look contradictory
    • Define the measurand and complete configuration
    • S11 is boundary evidence, not radiation evidence
    • Patterns and polarization need more than one cut
    • Far field, quiet zone, reflections, positioning, and dynamic range
    • Gain and efficiency method families
    • Cable, common mode, fixture, chamber loading, and references
    • Active OTA, TRP, TIS, and operating modes
    • Field and packet trials are channel/system evidence
    • Reconcile simulation, bench, chamber, and use-case evidence
    Open module