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Paper Abstract and Keywords
Presentation 2025-04-10 14:20
Exploring the Friis Transmission Formula -- Transmission system diagram consisting of transmitting and receiving antennas --
Yoshio Karasawa AP2025-3
Abstract (in Japanese) (See Japanese page) 
(in English) About 10 years ago, we explored some mysterious points in the Friis transmission formula [1]. In this report, I will focus on the following three points to which we did not refer at the time. 1) The relationship between antenna gain and effective area plays an important role in the Friis formula, but is there a way to directly derive the effective area from an omnidirectional antenna? 2) How we draw a transmission system diagram of the formula considering the functions of both the transmitting and receiving antennas? 3) Both received powers calculated using the Friis formula and an electromagnetic method will lead to the same answer as a matter of course, but what is the link between these two methods with different viewpoints?
Keyword (in Japanese) (See Japanese page) 
(in English) Friis transmission formula / Antenna gain / Effective area / Free space propagation loss / Transmission system diagram / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 1, AP2025-3, pp. 13-18, April 2025.
Paper # AP2025-3 
Date of Issue 2025-04-03 (AP) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF AP2025-3

Conference Information
Committee AP  
Conference Date 2025-04-10 - 2025-04-11 
Place (in Japanese) (See Japanese page) 
Place (in English) Himeji-Citizens-hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antennas and Propagation, Electoromagnetic Simulation 
Paper Information
Registration To AP 
Conference Code 2025-04-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Exploring the Friis Transmission Formula 
Sub Title (in English) Transmission system diagram consisting of transmitting and receiving antennas 
Keyword(1) Friis transmission formula  
Keyword(2) Antenna gain  
Keyword(3) Effective area  
Keyword(4) Free space propagation loss  
Keyword(5) Transmission system diagram  
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1st Author's Name Yoshio Karasawa  
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Speaker Author-1 
Date Time 2025-04-10 14:20:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2025-3 
Volume (vol) vol.125 
Number (no) no.1 
Page pp.13-18 
#Pages 6 
Date of Issue 2025-04-03 (AP) 

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