Browse Prior Art Database

MULTI-POWER AND MULTI-FREQUENCY HIGH DIRECTIVITY DIRECTIONAL COUPLER

IP.com Disclosure Number: IPCOM000006684D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-23
Document File: 2 page(s) / 81K

Publishing Venue

Motorola

Related People

Mike Petersen: AUTHOR

Abstract

This invention starts with a standard microstrip direc- tivity. This coupler which uses multiport feed lines tional coupler. Additional sections are then added to allow resolves the issue of degraded performance by termi- for more coupling. For couplers which arc terminated nating the lines with loads which compensate for the in the characteristic impedance of the transmission lie, additional lines and actually enhances the directivity. Fig- the addition of sections would degrade the performance ure 1 shows the layout for a 5 port coupler. It should be of the coupler in terms of return loss, coupling, and direc- noted that the number or legs on the coupler can vary.

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MOTOROLA INC. Technical Developments Volume 17 December 1992

MULTI-POWER AND MULTI-FREQUENCY HIGH DIRECTIVITY DIRECTIONAL COUPLER

by Mike Petersen

  This invention starts with a standard microstrip direc- tivity. This coupler which uses multiport feed lines tional coupler. Additional sections are then added to allow resolves the issue of degraded performance by termi- for more coupling. For couplers which arc terminated nating the lines with loads which compensate for the in the characteristic impedance of the transmission lie, additional lines and actually enhances the directivity. Fig- the addition of sections would degrade the performance ure 1 shows the layout for a 5 port coupler. It should be of the coupler in terms of return loss, coupling, and direc- noted that the number or legs on the coupler can vary.

OUT I 1

LOAD Ll -L4

i!7ml!s IN JR

**

FIGURE 1

  The coupler in Figure 1 shows five coupled port lines of which one is the actual port where the coupled RF signal will be sensed. The remaining ports, Ll-L4, are the load ports where the terminating impedances are located. It is not required that each of the ports be terminated for operation. In fact, the initial intent of this design is for only one port to be loaded for each specific power and/or frequency of operation. For example, at 153MHz, L4 is terminated with the optimiied load and the remaining ports (Ll-L3) are letI open. At 280MHz, L3 would be terminated with an optimized load and the remaining ports (Ll-L2, L4) would rema...