Taiwan AESA Radar

choi

Taiwan AESA Radar to Challenge International Market Share. The National Interest.com, Nov 25, 2018.
https://nationalinterest.org/blo ... -market-share-36867

Note:
(a) The National Interest
https://en.wikipedia.org/wiki/The_National_Interest
(b) Tron Future Tech
https://tronfuturetech.com
("創。未來科技股份有限公司創立於2018年，為國立交通大學基於科技基本法，依法技術作價持股創立新創公司，公司營收按比率回饋國立交通大學")
(i) This website provides no link. That is, everything about the startup is in this Web page.
(ii) On AESA:

in Chinese: "AESA[:] UHF到Ku頻全數位相控陣列系統一站式方案[;] RF SoC天線整合封裝。可無縫緊貼表層天線罩[;] GaN版系統2019年中試產。每發射單元0.01到100W(註)[;] 最低導入風險與總持有成本。MIL-STD-810G
註：最大功率依運作頻率與系統散熱要求有所不同"

in English: "相列雷達[:] UHF-Ku Band All-digital AESA Turnkey Solutions[;] RF SoC AiP。Radome Conformal Integration[;] GaN Version Sample in Mid-2019。0.01-100W/TX(1)[;] Low Risks and Cost of Ownership。MIL-STD-810G
1: peak power varies with operating frequencies and system heat requirements"

choi

(b) "Though Taiwan's state-run National Chung-Shan Institute of Science and Technology (NCSIST) 國家中山科學研究院 has built large road-mobile and fixed land-based passive electronically scanned (PESA) radars for the military, this appears to be the first time a Taiwan entity has been able to produce an AESA with GaN."

Browse through (b)(i) and proceed to (ii) and (iii). The latter two have graphics to help you conceptualize. At last return to (i) and read it again.
(i) Lee Cloer, What is the Difference Between a Passive Electronically Scanned Array (PESA) and an Active Electronically Scanned Array (AESA) Radar?  Duotech, Dec 11, 2017.
https://duotechservices.com/diff ... adar-and-aesa-radar
(A) Read the lower half of the content, starting with this paragraph: "Before we cover the differences between a Passive Electronically Scanned Array (PESA) and an Active Electronically Scanned Array (AESA), let’s look at what is similar between these two.
(B) phased array
https://en.wikipedia.org/wiki/Phased_array

View only the top two graphics, which are both animations. Though the first animation does not say so, its single transmitter ("TX") indicates this is PASSIVE. See(iii) and (iv).
(ii) RF MEMS Phase Shifters. MEMS Journal, April 2009.
https://www.memsjournal.com/2009/04/rf-mems-phase-shifters-.html

two consecutive paragraphs:

"In general, the choice between an active electronically scanned array (AESA) and a PESA is determined by the range requirement. An AESA has distributed power amplification because every antenna is connected to a T/R module. An AESA therefore has a higher EIRP x Gr/T product (dynamic range) and better search and track capabilities than a PESA. A PESA has centralized power amplification, but offers cost, prime power consumption, size and weight savings, as shown in Fig. 3.

"Some airborne platforms, such as fighter jets, have a dual need. For example they have a high-performance nose-cone AESA radar sensor to search and track agile targets, and a low-power pod-mounted PESA radar sensor underneath to measure the height, to follow (avoid) terrain, or to map the ground during a low fly over. The use depends on the range of the envisioned target.

(A) One has to CLICK Fig 3 to view the FULL of it.
(B) MEMS stands for microelectromechanical systems.
https://en.wikipedia.org/wiki/Microelectromechanical_systems
(iii) Search images.google.com with (aesa pesa radar slideshare.net), and in the top row you will see it.

choi

(c) "A [Tron] company spokesperson said that this includes the $2.3 billion XAT-5 Blue Magpie advanced jet trainer project (AT-3 Tzu Chung replacement), now under construction at the state-owned Aerospace Industry Development Corporation (AIDC). "
(i) XAT-5 AJT Advanced Jet Trainer. Global Security, undated
https://www.globalsecurity.org/military/world/taiwan/at-5.htm
("The new DPP government of president Tsai Ing-wen wanted to build a completely indigenous trainer, dubbed the XAT-5 AJT. By 2015 the Air Force's AT-3 and F-5 training jets were nearing the end of their respective service life and in critical need of upgrades. Taiwan's AT-3 aircraft were built in the 1980s and built by AIDC with foreign assistance. The replacement will be fielded to two bases: one in Taitung to replace the aging F-5E/F Tigers 虎 and the other in Kangshan to replace the AT-3s")
(ii) "AIDC AT-3 Tzu Chung 自強 'Self Reliance' is an advanced jet trainer operated by the Republic of China Air Force (ROCAF). A total of sixty-two aircraft were manufactured by the Aerospace Industrial Development Corporation 漢翔航空工業股份有限公司 [state-owned] of Taiwan in collaboration with American aircraft manufacturer Northrop between 1984 and 1990. Two A-3 single-seat attack version were also built."  en.wikipedia.org for "AIDC AT-3."

The "AT" stands for trainer aircraft.
(iii) I do not know what XAT stands for, But zh,wikipedia.org has a page for "T-5教練機" (T-5 trainer): "開發時期的代號曾包括：XAT-5、AT-5、XT-5等等。T-5教練機是由F-CK-1戰鬥機為基礎研發而來。"