impedance matching

2 Stack Match Yagi Antenna - Solves antenna matching problem with two phased antennas. Stacked rotary beams are popular. However, connecting two 50 Ohm antennas together presents some problems.

20 Meter Ground Plane Vertical Antenna - This is a ground plane antenna for 20 meters with an imput impedance of 50 ohms

14 el 70 MHz Low Noise LFA Yagi - This is a true monster Yagi for the 4m band which has a 50Ohm feedpoint with wide band performance yet the gain and F/B of a low impedance Yagi.

7 elements 50Mhz Yagi Antenna Priority listing - A very simple to build, compact 7el 50MHz OWA requiring no complex matching and flat SWR across the bottom of the 6m band

11el 50MHz OWA Yagi Priority listing - A real Monster true OWA for 50Mhz with real serious performance. Constant impedance, supper low SWR, high gain and F/B and easy to build.

G0KSC 10el 50Mhz OWA Yagi - A huge easy-to-build 6m antenna with huge performance. Easy build, split dipole, no matching required. Super low SWR too.

80m mobile antenna - The antenna is made in four sections which consists of a base matching coil, a helical section, a centre loading coil and the top whip section with its capacity hat by G4DCH

Online Antenna Analysis and Design Software  ^updated - Free online software to calculate wire antenna power patterns, directivity, input impedance using method of moments.

Magnetic Long Wire UnUn 9:1 - An impedance transformer (9:1) to feed a high impedance long wire (~450 ohm), down to a 50 ohm unbalanced coaxial input.

Tuner Baluns on Input - There is a common perception that placing a balun on the input of a tuner causes the balun to work better. The thought is the balun operates with a matched impedance and that reduces balun losses. It also is thought that moving the balun improves balance.

1:4 Current Balun - This project is intended to aid in tuning a balanced antenna or feedline that has a high impedance 100-600 ohms by N5ESE

Antenna Matching Coil Adjustment Procedure - Without this basic knowledge, addressing antenna problems, RFI problems, and matching problems, results in a frustrating situation. Procedure which must be followed to properly adjust a shunt matching coil.

The Sloping Vertical Dipole - The radiating part is the vertical half of the dipole. You get nearly radiation in all directions, the second half must not be in 180°. The table below show how we get an impedance for direct feeding of 50Ohm coax. by DK7ZB

Fabricating Impedance Transformers - Fabricating impedance transformers for receiving antennas by John Bryant

Cushcraft R5 Matching Unit Rebuild - This article describes how to rebuild a matching unit of a Cushcraft R5 vertical by G0WCW

Antenna Matching - Antennaa matching basics, matching input impedance, reactance vs. SWR, info on inductive matching and UNUN Matching systems. Capacitive Matching Odds & Ends by K0BG

Impedance Matching - Article by By David Knight and Nigel Williams on Impedance Matching, basic principles, popular matching networks, L-Network solutions, materials and components in impedance matching designs

Antena gamma match - Gamma match antenna is an antenna 1/2 additional lambda with the impedance matching more flexible arrangements (var capacitor) by sliding through the gamma match/road.

Matching a 5/8 vertical - The 5/8 vertical it quite popular and matching solutions can vary

13m high elevated vertical - This article explores the performance of an unloaded elevated vertical, base matching and feed line as a multi-band HF antenna system.

Hittite Microwave Corporation - Amplifiers, filters, attenuators, mixers, PLL, switches and frequency dividers, signal generators, power detectors, transimpedance amplifiers, variable gain amplifiers and more

RF Cool Tools Real Time Design - RFCoolTools RLC Filter Simulation, S-parameter Plotter, Filter Optimization,Broadband Impedance Match

iRFC for iPhone - IRFC offers a full Radio Frequency Calculator on the go for network impedance adaptation with smith chart

Measuring Zs in solid-state amplifier - Measuring the output impedance (Zs) of solid-state broadband HF amplifiers operating in class AB eham article by ZS6BIM

Anatomy of a Loudspeaker - There are a number of important technical issues relating to the matching of speakers to amplifiers, and to the wiring of multiple speaker systems