# US 7,609,220 B2 · Channelized log-periodic antenna with matched coupling

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- Number: US 7,609,220 B2
- Document ID: US7609220B2
- Status: Granted
- Kind: B2
- Application number: 11/430,524
- Filed: 2006-05-09
- Published: 2006-11-23
- Granted: 2009-10-27
- Earliest claimed: 2005-05-09
- Assignees: The Regents of the University of California
- Inventors: Gregory Engargiola; Adrian Lee
- Web page: https://patentgrep.com/patent/US7609220B2

## CPC

- H01Q 1/10: Telescopic elements
- H01Q 1/38: formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142)}
- H01Q 9/27: Spiral antennas
- H01Q 19/062: {for focusing}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

A log-periodic antenna coupled to a channelizer is described in which matched scale constants for the antenna and the channelizer are used to achieve substantially identical coupling over each fractional bandwidth channel. Embodiments for simultaneous dual polarization operation are described as well as embodiments suited for planar lithographic fabrication.

## Claims

### Claim 1

A combination of log-periodic antenna and log-periodic channelizer, wherein said combination comprises a planar log-periodic antenna electrically coupled through one or more taperline baluns to at least one log-periodic channelizer separate from said log-periodic antenna and located on the same substrate as said log-periodic antenna, and wherein said at least one log-periodic channelizer is a multi-port circuit including a series of diplexers and channel-defining filters of substantially equal electrical length, and wherein the size scale factor of adjacent conductors of said log-periodic antenna is substantially the same as the scale factor between center frequencies of adjacent channels of said at least one log-periodic channelizer, and whereby said coupling is substantially identical between each fractional bandwidth channel of said at least one log-periodic channelizer and said log-periodic antenna.

### Claim 2 (depends on 1)

A combination as in claim 1 wherein said log-periodic antenna is a dual polarization antenna having components thereof disposed on opposite faces of a dielectric layer.